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MC44BC374T1 ordering information device temp range package MC44BC374T1d, r2 -20c to +85c so16nb note: for tape and reel, add r2 suffix. so16nb package this document contains information on a product under development. motorola reserves the right to change or discontinue this product without notice. ? motorola, inc., 2002. all rights reserved. this modulator circuit is for use in vcrs, set-top boxes, and similar devices. figure 1 shows the pin connections. figure 1. pin connection diagram gndd vccd xtal gnd tvovcc audio gnd pllflt sda scl stby preem tvout vcca 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 splflt video technical data MC44BC374T1/d rev. 1.2 07/2002 MC44BC374T1 pll tuned pal/ntsc uhf and vhf audio/ video high integration modulator ic contents list 1 features.............1 2 deviceoverview ......3 3 maximumratings .....4 4 thermalrating .......4 5 electrostatic discharge 4 6 electrical characteristics 5 7 i2cbitmapping.......5 8 i2c programming . . . . . 6 9 modulator high frequency characteristics 8 10 video characteristics . . 9 11 audio characteristics . 10 12 characterization measurement conditions 11 13 modulator operation . 16 14 high speed i2c compatible bus 19 15 pin circuit schematics 22 16 application and case diagrams ...........23
2 MC44BC374T1 technical data motorola features 1 features the channel is set by an on-chip high-speed i 2 c compatible bus receiver. a phase-locked loop (pll) tunes the modulator over the full uhf range. the modulator incorporates a sound subcarrier oscillator and uses a second pll to derive 4.5, 5.5, 6.0, and 6.5mhz subcarrier frequencies. these frequencies are selectable using the bus. the modulation standard is set to system b/g. the picture-to-sound ratio is adjusted using the bus. in addition, an on-chip video test pattern generator can be turned on with a 1khz audio test signal. compared with the mc44bc374c, this modulator has one iic programming difference, a hardware standby mode in addition to the software standby mode, and no logic output port. compared with the mc44bc374t, this modulator has a different start-up channel. the MC44BC374T1 also has the following features: ? no external varicaps diodes/inductor or tuned components channel 21-69 uhf operation vhf range possible by internal dividers (30mhz?450mhz) integrated on-chip programmable uhf oscillator extremely low external components count highspeedi 2 c-bus compatible (800khz) fixed video modulation depth (80%) peak white clip disabled via the bus programmable picture/sound carrier ratio (12db and 16db) integrated on-chip programmable sound subcarrier oscillator (4.5mhz to 6.5mhz)?no external varicaps on-chip video test pattern generator with sound test signal (1khz) low-power modulator standby mode programmable by i 2 c bus or switchable by stby pin voltage transient output inhibit during pll lock-up at power-on start-up on channel ?71? (871.25 mhz) extremely robust esd protection, minimum 4kv, typical 6kv
device overview motorola MC44BC374T1 technical data 3 2 device overview figure 2 shows a simplified block diagram of the MC44BC374T1device. the MC44BC374T1 device has three main sections: 1. a high speed i 2 c-compatible bus section 2. a pll section to synthesize the uhf/vhf output channel frequency (from an integrated uhf oscillator, divided for vhf output) 3. a modulator section, which accepts audio and video inputs, then uses them to modulates the uhf/vhf carrier an on-chip video test pattern generator with an audio test signal is included. the MC44BC374T1 is designed to operate as a b/g standard modulator. high frequency bicmos technology allows integration of the uhf tank circuit and certain filtering functions. figure 2. MC44BC374T1 simplified block diagram 8 13 1 2 6 11 14 9 4 12 7 3 10 15 16 tvovcc tvout stby video spllflt audio vcca gnd preem xtal pllflt gndd vccd scl sda bus section vco and pll section modulator section clamp peak white 31.25 31.25khz 4mhz xco ref divider /128 phase comp pll prog divider prescaler/8 vhf dividers video modulator lpf lpf sound modulator fm alc lpf prog divider audio amplifier sound oscillator and fm modulator sound pfd khz high speed i 2 cbus receiver uhf osc i 2 cbus i 2 cbus i 2 cbus i 2 cbus i 2 cbus 75 ? 5 gnd clip
4 MC44BC374T1 technical data motorola maximum ratings 3 maximum ratings 4 thermal rating 5 electrostatic discharge electrostatic discharge (esd) tests are done on all pins. sym parameter value unit r thja thermal resistance from junction to ambient 140 c/w sym parameter min typ unit esd mm (machine model) - mil std 883c method 3015-7 200 500 v esd hbm (human body model) - mil std 883c method 3015-7 4000 6000 v sym parameter value unit vcc supply voltage 6 v tamin minimum operating ambient temperature ?20 o c tamax maximum operating ambient temperature 85 o c tstgmin minimum storage temperature ?65 o c tstgmax maximum storage temperature 150 o c tj junction temperature 150 c this device contains protection circuitry to guard against damage due to high static voltage or electric fields. however, precautions must be taken to avoid applications of any voltage higher than maximum rated voltages to this high impedance circuit. for proper operation, input and output voltages should be constrained to the ranges indicated in the recommended operating conditions. maximum ratings are those values beyond which damage to the device may occur. for functional operation, values s hould be restricted to the recommended operating condition. meets moisture sensitivity level 1, no dry pack required
electrical characteristics motorola MC44BC374T1 technical data 5 6 electrical characteristics a = 100% tested b = 100% correlation tested c = characterized on samples d = design parameter 6.1 specification conditions unless otherwise stated: v cc =5.0v, ambient temperture=25 o c, video input 1v p-p , 10-step grayscale. rf output into 75ohm load. specifications only valid for envelope demodulation. 7i 2 c bit mapping parameter min typ max unit notes type operating supply voltage range 4.5 5.0 5.5 v b total supply current 44 52 60 ma all sections active a total standby mode supply current 3 6 9 ma bus section active a test pattern sync pulse width 3 4.7 6.5 sb sound comparator charge pump current during locking when locked 7 0.7 10 1 12 1.5 a a a a rf comparator charge pump current 60 100 150 aa crystal oscillator stability?negative resistance 1 ? ? k ? d stby pin dc current force 5v to stby pin force 0v to stby pin ? ? ? ? 1 -10 a a a a write mode bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 ack ca?chipaddress 11001010ack c1?high order bits 1 0 so 0 ps x3 x2 0 ack c0?low order bits pwc osc att sfd1 sfd0 0 x5 x4 ack fm?high order bits 0 tpen n11 n10 n9 n8 n7 n6 ack fl?low order bits n5 n4 n3 n2 n1 n0 x1 x0 ack bit name description pwc peak white clip enable/disable osc uhf oscillator on/off att modulator output attenuated?sound and video modulators on/off sfd0, 1 sound subcarrier frequency control bits so sound oscillator on/off ps picture-to-sound carrier ratio tpen test pattern enable?picture and sound x5?x0 test mode bits?all bits are 0 for normal operation (see test mode tables, page 6 & page 7) except ?osc? bit (normal mode is ?1?) n0?n11 uhf frequency programming bits, in steps of 250khz
6 MC44BC374T1 technical data motorola i2c programming 8i 2 c programming write mode: test mode 1 and vhf range x2 x1 x0 state description 0 0 0 1.a normal operation 0 0 1 1.b rf frequency divided for low frequency testing or vhf range: rf/2 0101.crf/4 0111.drf/8 1001.erf/16 1 0 1 1.f dc drive applied to modulators: non-inverted video at tvout 1 1 0 1.g dc drive applied to modulators: inverted video at tvout 1111.h transient output inhibit disabled during this speed-up test mode, att=0 forces sound current source to 1 a, and att=1forcesitto10 a. sound standby mode sfd1 sfd0 sound subcarrier freq (mhz) 00 4.5 01 5.5 10 6.0 11 6.5 ps picture-to-sound ratio (db) 012 116 so sound oscillator 0 sound oscillator on (normal mode) 1 sound oscillation disabled (oscillator and pll osc so att combination of 3-bits 0 1 1 modulator standby mode. uhf video osc uhf oscillator 1 normal operation 0 uhf oscillator disabled (oscillator and pll sections bias turned off) att modular output attenuation 0 normal operation 1 modulator output attenuation (sound and video modulators sections bias turned off. pwc peak white clip 0peakwhiteclipon 1peakwhiteclipoff tpen test pattern signal 0 test pattern signal off (normal operation) 1 test pattern signal on (picture and sound)
i2c programming motorola MC44BC374T1 technical data 7 write mode: test mode 2 note: test modes 1 and 2 are intended for manufacturing test purpose only and cannot be used for normal application, except for vhf range (states 1.b to 1.e) x5 x4 x3 state description 0 0 0 2.a normal operation 0 0 1 2.b test pattern generator dc verification (test pattern dc test mode available) 010 2.c programmable divider test (uhf prog. div. on pllfilt and sound prog. div. on spllfil pin ) 0 1 1 2.d reference divider test (uhf reference divider on pllfilt pin) 100 2.e uhf phase comparator, upper source on pllfilt pin sound phase comparator 10 a upper source on spllfil (only valid during transient output inhibit) 101 2.f uhf phase comparator, lower source on pllfilt pin sound phase comparator 10 a lower source on spllfil (only valid during transient output inhibit) 110 2.g sound phase comparator 1 a upper source on spllfil (not valid during transient output inhibit) 111 2.h sound phase comparator 1 a lower source on spllfil (not valid during transient output inhibit)
8 MC44BC374T1 technical data motorola modulator high frequency characteristics 9 modulator high frequency characteristics unless otherwise stated: v cc =5.0v, ambient temperture=25 o c, video input 1v p-p , 10-step grayscale. rf inputs/outputs into 75ohm load. specifications only valid for envelope demodulation. figure 3. typical performance parameter test conditions min typ max unit type tvout output level output signal from modulator section see figure 3. see note 2 73 74.5 77 db vb uhf oscillator frequency 460 ? 880 mhz a vhf range from uhf oscillator internally divided 45 ? 460 mhz b tvout output attenuation during transient output inhibit, or when att bit is set to 1. see figure 3. seenote2 50 60 ? dbc b sound subcarrier harmonics (fp + n ? fs) reference picture carrier. see note 2 ? 63 58 dbc c second harmonic of chroma subcarrier using red ebu bar. see note 2 ? ? 65 dbc c chroma/sound intermodulation: fp + (fsnd ? fchr) using red ebu bar.see note 2 ? ? 65 dbc c fo (picture carrier) harmonics 2nd harmonic: ch21 3rd harmonic: ch21 other channels: see figure 3. see note 1. see note 2 ? ? 35 26 30 22 dbc c out band (picture carrier) spurious 1/2 ? fo?1/4 ? fo?3/2 ? fo?3/4 ? fo from 40mhz to 1ghz. see note 2 ?010db vc in band spurious (fo 5mhz) no video sound modulation.see note 2 ? ? 60 dbc c note: 1: picture carrier harmonics are highly dependant on pcb layout and decoupling capacitors. note: 2: see ?characterization measurement conditions? on page 11. tv output level 72 73 74 75 76 77 78 471 521 571 621 671 721 771 821 871 frequency (mhz) dbuv tv output attenuation 45 50 55 60 65 70 75 471 521 571 621 671 721 771 821 871 fr e qu e ncy (m hz ) dbc 3fo harm onics 15 20 25 30 35 40 45 471 521 571 621 671 721 771 821 871 fr e que ncy (m hz ) dbc 2fo harm onics 15 20 25 30 35 40 471 521 571 621 671 721 771 821 871 fr e que ncy (m hz ) dbc typical minimum specification minimum specification typical typical typical minimum specification maximum specification minimum specification
video characteristics motorola MC44BC374T1 technical data 9 10 video characteristics unless otherwise stated: v cc =5.0v, ambient temperture=25 o c, video input 1v p-p , 10-step grayscale. rf inputs/outputs into 75ohm load. specifications only valid for envelope demodulation. figure 4. typical performances parameter test conditions min typ max unit type video bandwidth reference 0db at 100khz, measured at 5mhz. see note 2 ?1.5 ?0.8 ? db c video input level 75ohm load ? ? 1 . 5vcvbs d video input current ? 0.2 1 aa video input impedance 500 ? ? k ? a peak white clip pwcbitsetto1,seepwcsection. seenote2 110 114 118 % a video s/n no sound modulation,100% white video using ccir rec.567 weighting filter see figure 4. see note 2 50 53 ? db c unweighted. see note 2 45 ? ? c differential phase ccir test line 330, worst case from the first 4 steps out of 5. see note 2 ?5 ? 5 deg c differential gain ccir test line 310, worst case from the first 4 steps out of 5. see note 2 ?5 ? 5 % c luma/sync ratio input ratio 7 . 0:3 . 0 6.8/ 3.2 ? 7.2/ 2.8 ?b video modulation depth see figure 4.see note 2 75 81 88 % b video signal to noise 48 50 52 54 56 58 471 521 571 621 671 721 771 821 871 fr e que ncy (m hz ) db pal v ide o m odulation de pth 74 76 78 80 82 84 86 88 90 471 521 571 621 671 721 771 821 871 fr e qu e ncy (m h z ) % typical typical minimum specification maximum specification minimum specification
10 MC44BC374T1 technical data motorola audio characteristics 11 audio characteristics unless otherwise stated: v cc =5.0v, ambient temperture=25 o c, video input 1v p-p , 10-step grayscale. rf output into 75ohm load. specifications only valid for envelope demodulation. figure 5. typical performances parameter test conditions min typ max unit type picture-to-sound ratio ps bit set to 0 ps bit set to 1 13 9 16 12 19 15 db b audio modulation depth using specific pre-emphasis circuit, audio input level=205mvrms?audio frequency=1khz fm modulation: fs=5.5, 6 or 6.5mhz 100% modulation=50khz fm deviation ?80? % b fm modulation: ntsc fs=4.5mhz 100% modulation=25khz fm deviation ?80? % b audio input resistance 45 53 61 k ? a audio frequency response reference 0db at 1khz, using specified pre-emphasis circuit, measure from 50hz to 15khz ?2.5 ? + 2db c audio distortion fm (thd only) at 1khz, 100% modulation ( 50khz) no video ?0.4 2 % c audio s/n with sync buzz fm see figure 4 48 53 ? db c audio signal to noise 46 48 50 52 54 56 58 471 521 571 621 671 721 771 821 871 frequency (mhz) db typical minimum specification
characterization measurement conditions motorola MC44BC374T1 technical data 11 12 characterization measurement conditions device default configuration unless otherwise specified: peak white clip enable uhf oscillator on sound and video modulators on sound subcarrier frequency = 5.5mhz sound oscillator on picture-to-sound carrier ratio = 12db test pattern disabled all test mode bits are ?0? frequency from channel 21 to 69 rf inputs / output into 75ohm load using a 75 to 50 ohm transformation. video input 1v pk-pk. audio pre-emphasis circuit engaged. device and signals set-up measurement set-up tvout output level video: 10 steps grey scale no audio measured picture carrier in dbuv with the hp8596e spectrum analyzer using a 75 to 50 ohm transformation, all cables losses and transformation pads having been calibrated. measurement used as a reference for other tests: tvout_ref tvout output attenuation ?att? bit = 1 no video signal no audio signal measure in dbc picture carrier at ?att?=?1? with reference to picture carrier at ?att?=?0?. sound subcarrier harmonics video: 10 steps grey scale no audio signal measure in dbc second and third sound harmonics levels in reference to picture carrier (tvout_ref). picture carrier sound carrier sound +5.5mhz fo +11mhz +16.5mhz 2nd harm sound 3rd harm
12 MC44BC374T1 technical data motorola characterization measurement conditions second harmonics of chroma subcarrier no audio video: a 700mvpk-pk 100khz sinusoidal signal is inserted on the black level of active video area. measure in dbc, in reference to picture carrier (tvout_ref), second harmonic of chroma at channel frequency plus 2 times chroma frequency, resulting in the following spectrum chroma/sound intermodulation no audio signal video: 700mvpk-pk 100khz sinusoidal signal inserted on the black level of active video area.this is generated using a rohde & schwarz video generator saf and inserting the required frequency from a rf signal generator. measure in dbc, in reference to picture carrier (tvout_ref), intermodulation product at channel frequency plus the sound carrier frequency (+5,5mhz) minus the chroma frequency (-4,43mhz), resulting in the following spectrum. intermodulation product is at the channel frequency +1,07mhz. picture carrier harmonics no video signal no audio signal measure in dbc, in reference to picture carrier (tvout_ref), second and third harmonic of channel frequency, resulting in the following spectrum. device and signals set-up measurement set-up 700mv pk-pk frequency 100khz frequency 100khz 700mvpkpk picture carrier sound chroma 2nd +8.86mhz fo +4.43mhz +5.5mhz harmonic carrier chroma carrier 700mv pk-pk frequency 100khz frequency 4.43mhz 700mvpkpk picture carrier chroma/sound +1.07mhz fo intermod. sound +4.43mhz +5.5mhz carrier chroma carrier picture carrier 3rd harmonic 3fo fo 2fo 2nd harmonic
characterization measurement conditions motorola MC44BC374T1 technical data 13 out of band spurious no video signal no audio signal measure in dbuv spurious levels at 0.25, 0.5, 0.75 and 1.5 times channel frequency, resulting in the following spectrum measure from 40mhz to 1ghz . in band spurious no video signal no audio signal measure in dbc, in reference to picture carrier (tvout_ref), spurious levels falling into video bandwidth fo+/-5mhz. video bandwidth no audio video: 600mvpk-pk sinusoidal signal inserted on the black level of active video area. the video signal is demodulated on the spectrum analyzer, and the peak level of the 100khz signal is measured as a reference. the frequency is then swept from 100khz to 5mhz, and then the difference in dbc from the 100khz reference level is measured. peak white clip no audio signal. video:10stepgreyscale the video modulation depth is measured for 1.0vcvbs input level, giving modulation depth mda. then the same measurement is carried out for an input level of 1.4vcvbc, giving modulation depth mdb. the peak white clip is defined as 100*mdb/mda. weighted video signal to noise video: 100% white video signal - 1vpk- pk. no audio signal this is measured using a rohde & schwarz amfs uhf demodulator in b/g (using a ccir rec. 567 weighting network, 100khz to 5mhz band with sound trap and envelope detection, and a rohde & schwarz uaf video analyzer. the video analyzer measures the ratio between the amplitude of the active area of the video signal (700mv) and the noise level in vrms on a video black level which is show below. videos/n is calculated as 20 x log(700 /n) in db unweighted video signal to noise same as above with ccir filter disabled. same as above. video differential phase video: 5 step grey scale- 1vpk-pk. no audio signal this is measured using a rohde & schwarz amfs uhf demodulator in b/g (using a ccir rec. 567 weighting network, 100khz to 5mhz band with sound trap, and envelope detection, and a rohde & schwarz uaf video analyzer. on line ccir 330, the video analyzer dp measure consists of calculating the difference of the chroma phase at the black level and the different chroma subcarrier phase angles at each step of the greyscale. the largest positive or negative difference indicates the distortion. the video analyzer method takes the worst step from the first 4 steps. device and signals set-up measurement set-up picture carrier fo*3/2 fo/2 fo/4 fo*3/4 fo spurious n noise level in vrms diff phase = * 100% the phaseat position 0 the largest positive or negative difference
14 MC44BC374T1 technical data motorola characterization measurement conditions video differential gain video: 5 step grey scale- 1vpk-pk. no audio signal this is measured using a rohde & schwarz amfs uhf demodulator in b/g (using a ccir rec. 567 weighting network, 100khz to 5mhz band with sound trap and envelope detection, and a rohde & schwarz uaf video analyzer. on line ccir 330 shown below, the video analyzer dg measure consists of calculating the difference of the chroma amplitude at the black level and the different amplitudes at each step of the greyscale. the largest positive or negative difference indicates the distortion. the video analyzer method takes the worst step from the first 4 steps. video modulation depth no audio signal video:10stepgreyscale this is measured using a hp8596e spectrum analyzer with a tv trigger option, allowing demodulation and triggering on any specified tv line. the analyzer is centred on the maximum peak of the video signal and reduced to zero hertz span in linear mode to demodulate the video carrier. the modulation depth is calculated as (a-b)/a x 100 in% picture to sound ratio no video signal no audio signal ?ps? bit set to 0 and 1 measure in dbc sound carrier in reference to picture carrier (tvout_ref) for ?ps? bit=0 (ps=12db typical) and for ?ps? bit=1 (ps=16db), audio modulation depth - fm modulation video black level audio signal: 1khz, 205mvrms. this is measured using a rohde & schwarz amfs demodulator in b/g and a hp8903a audio analyzer at 1khz the audio signal 205mv at 1khz is supplied by the audio analyzer, and the fm demodulated signal deviation is indicated on the demodulator in khz peak. this value is then converted in% of fm deviation, based on specified standards. device and signals set-up measurement set-up 0 1 2 3 4 5 5-step greyscale with chroma subcarrier superimposed (not to scale), line ccir 330. diff gain =* 100% the amplitude at position 0 the largest positive or negative difference a ( 6-10mv) b (0.6 - 3mv) tv line demodulated by spectrum analyzer-bg standard a(mv) b(mv) picture carrier sound carrier +5.5mhz fo
characterization measurement conditions motorola MC44BC374T1 technical data 15 audio frequency response video black level audio signal: 50hz to 15khz, 100mv rms this is measured using a rohde & schwarz amfs demodulator in b/g and a hp8903a. the audio signal 1khz 100mv rms is supplied by the audio analyzer, demodulated by the demodulator and the audio analyzer measures the ac amplitude of this demodulated audio signal: this value is taken as a reference (0db). the audio signal is then swept from 50hz to 15khz, and demodulated ac amplitude is measured in db relative to the 1khz reference. audio pre-emphasis and de-emphasis circuits are engaged, all audio analyzer filters are switched off. audio distortion fm audio: 1khz, adjustable level video black level this is measured using a rohde & schwarz amfs uhf demodulator in b/g and a hp8903a audio analyzer at 1khz. the output level of the audio analyzer is varied to obtain a deviation of 50khz indicated on the demodulator. the input rms detector of the audio analyzer converts the ac level of the combined signal + noise + distortion to dc. it then removes the fundamental signal (1khz) after having measured the frequency. the output rms detector converts the residual noise + distortion to dc. the dc voltmeter measures both dc signals and calculates the ratio in% of the two signals. audiosignaltonoise audio: 1khz, adjustable level video: ebu color bars this is measured using a rohde & schwarz amfs demodulator in b/g and a hp8903a audio analyzer at 1khz. the output level of the audio analyzer is varied to obtain a modulation deviation of 25khz indicated on the amfs demodulator. the audio analyzer alternately turns on and off it's internal audio source to make a measure of the audio signal plus noise and then another measure of only the noise. the measurement is made using the internal ccir468-2 filter of the audio analyzer together with the internal 30+/-2khz (60db/decade) lowpass filters. the amfs demodulator uses a quasi-parallel demodulation as is the case in a normal tv set. in this mode the nyquist filter is bypassed and the video carrier is used without added delay to effectuate intercarrier conversion. in this mode the phase noise information fully cancels out and the true s/n can be measured device and signals set-up measurement set-up adist distorsion noise + () distorsion noise signal ++ () ? = asn db () 20 signal noise + () noise () ? log =
16 MC44BC374T1 technical data motorola modulator operation 13 modulator operation 13.1 power on settings at power-on, the MC44BC374T1 configuration is as follows: note: this power-on configuration is not available when modulator is switched on from stby pin. 13.2 power supply the three device vccs (pins 10, 13, 15) must be applied at the same time to ensure all internal blocks are correctly biased. all other pins must not be biased before vcc is applied to device (except stby pin during hardware standby mode). 13.3 standby modes during standby mode, the modulator is switched to low power consumption: the sound oscillator, uhf oscillator, video and sound modulator sections bias are internally turned off. the iic bus section remains active. modulator can be switched in standby mode in 2 cases: software standby mode: combination of 3 bits of iic message:osc=0, so=1 and att=1 hardware standby mode: stby pin is set to lo state hardware / software standby modes there is an internal logical ?or? function between the hardware and software standby modes: note: when switching from stby=lo to stby=hi, the modulator configuration is not guaranteed. an iic message has to be sent to program the modulator. write mode bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 ack c1 ? highorderbits 10000000ack c0 ? loworderbits 01001000ack fm ? highorderbits 0 0n11n10n9n8n7n6ack fl ? low order bits n5 n4 n3 n2 n1 n0 0 0 ack note: n0 to n11 are set to have uhf oscillator on channel 71 (871.25mhz). note: peak white clip is on. note: sound frequency is 5.5mhz. note: picture to sound ratio is 12db. hardware standby mode normal normal standby standby software standby mode normal standby normal standby modulator mode normal standby standby standby
modulator operation motorola MC44BC374T1 technical data 17 13.3.1 stby pin levels a pull down resistor may be used on stby pin in order to force an ?high impedance? condition into a lo state (i.e. standby mode condition). 13.4 transient output inhibit to minimize the risk of interference to other channels while the uhf pll is acquiring a lock on the desired frequency, the sound and video modulators are turned off for each of the following three cases: power-on from zero (i.e., all vcc is switched from 0v to 5v). uhf oscillator power-on from off state (i.e., osc bit is switched from 0 to 1) stby pin switched from lo state to hi state there is a time-out of 263ms until the output is enabled. this lets the uhf pll settle to its programmed frequency. during the 263ms time-out, the sound pll current source is set to 10 a typical to speed up the locking time. after the 263ms time-out, the current source is switched to 1 a . use care when selecting loop filter components, to ensure the loop transient does not exceed this delay. for test purposes, it is possible to disable the 263ms delay using test mode1?state1.h. 13.5 video section ? peak white clip the modulator requires: a composite video input with negative going sync pulses a nominal level of 1vp-p this signal is ac-coupled to the video input where the sync tip level is clamped. the video signal is then passed to a peak white clip circuit. the pwc circuit function is to soft-clip the top of the video waveform if the ?sync tip amplitude? to ?peak white clip? goes too high. this method avoids carrier over-modulation by the video. clipping can be disabled by software. 13.6 sound section the multivibrator oscillator is fully integrated and does not require any external components. an internal low-pass filter and matched structure give a very low harmonics level. the sound modulator system consists of an fm modulator incorporating the sound subcarrier oscillator the audio input signal is ac-coupled into the amplifier, which then drives both types of modulator. the audio pre-emphasis circuit is a high-pass filter with an external capacitor and an internal resistor (100kohms). the recommended capacitor value (470pf) is for bg standard; time constant is 50 s . modulator mode normal standby stby pin state hi lo stby pin level +5v or high impedance 0v
18 MC44BC374T1 technical data motorola modulator operation 13.7 test pattern generator the ic generates a simple test pattern, which can be switched under bus control to permit a tv receiver to easily tune to the modulator output. the pattern consists of two white vertical bars on a black background and a 976hz audio test signal. 13.8 pll section the reference divider is a fixed divide-by-128, resulting in a reference frequency of 31 . 25khz with a 4 . 0mhz crystal. the 31 . 25khz reference frequency is used for both uhf and sound plls. the prescaler is a fixed divide-by-8 and is permanently engaged. the programmable divider division-ratio is controlled by the state of control bits n0 to n11. the divider-ratio n for a desired frequency f (in mhz) is given by: with: 13.9 uhf oscillator ? vhf range the uhf oscillator is fully integrated and does not require any external components. for low frequency testing or vhf range operation (test mode 1, states 1.b to 1.c), the uhf oscillator can be internally divided by: 2, 4, 8, or 16. 13.10 differences from mc44bc374c device ?osc? bit programming is inverted start up channel is ?71? instead od ?36? hardware standby mode is added logic output port is not available ?tb1? bit is not available (limited software compatibility with the mc44355 device) read mode is not available 10 20 30 40 50 60 0 64 te1 24 28 44 time in s. 7/10 3/10 te2 n f 8 --- 128 4 -------- - = n 2048 n 11 1024 n 10 4 n 2 2 n 1 n 0 +++++ =
high speed i2c compatible bus motorola MC44BC374T1 technical data 19 14 high speed i 2 c compatible bus 14.1 specification conditions unless otherwise specified, vcc1=5.0v, ta=25 o c. 14.2 timings definition 14.3 levels definition electrical characteristics min typ max unit type sda / scl output current at 0v ?? 10 aa sda / scl low input level ?? 1.5 v b sda / scl high input level 3.0 ?? vb sda/scl input current for input level from 0.4v to 0.3vcc ? 5 ? 5 ac sda/scl input level 0 ? vcc+0,3 v d sda/scl capacitance ?? 10 pf c ack low output level (sinking 3ma) ? 0,3 1 v a ack low output level (sinking 15ma) ?? 1.5 v c timing characteristics min typ max unit type bus clock frequency 0 ? 800 khz c bus free time between stop and start 200 ?? ns c setup time for start condition 500 ?? ns c hold time for start condition 500 ?? ns c data setup time 0 ?? ns c data hold time 0 ?? ns c setup time for stop condition 500 ?? ns c hold time for stop condition 500 ?? ns c acknowledge propagation delay ?? 300 ns c sda fall time at 3ma sink i and 130pf load ?? 50 ns c sda fall time at 3ma sink i and 400pf load ?? 80 ns c sda rise time scl fall/rise time ? ? ? ? 300 300 ns ns c c pulse width of spikes suppressed by the input filter ?? 50 ns c tbuf ssda ... ... ack thd;dat tsu;dat tsu;sto thd;sta tack:low start stop sscl scl sda tsu;sta chip address scl sda thd;sto start stop sda ... 0v vcc vih vil dead band
20 MC44BC374T1 technical data motorola high speed i2c compatible bus 14.4 high speed i 2 c compatible bus format 14.5 i 2 c write mode format and bus receiver the bus receiver operates the i 2 c compatible data format. the chip address (i 2 c bus) is: in write mode, each ninth data bit (bits 9, 18, 27, 36, and 45) is an acknowledge bit (ack) during which the mcu sends a logic 1 and the modulator circuit answers on the data line by pulling it low. besides the chip address, the circuit needs two (2) or four (4) data bytes for operation. the following sequences of data bytes are the permitted incoming information: after the chip address, two or four data bytes may be received. if three data bytes are received, the third one is ignored. if five or more data bytes are received, the fifth and following ones are ignored, and the last ack pulse is sent at the end of the fourth data byte. the first and third data bytes contain a function bit, which lets the ic distinguish between frequency information and control information. if the function bit is a logic 1, the two following bytes contain control information. the first data byte after the chip address, may be byte co or byte fm. the two bytes of frequency information are preceded by a logic 0. 11001010 (ack)=$ca(hex)inwritemode example 1 sta ca c1 c0 sto example 2 sta ca fm fl sto example 3 sta ca c1 c0 fm fl sto example 4 sta ca fm fl c1 c0 sto with: sta = start condition ca = chip address fm = frequency information, high order bits fl = frequency information, low order bits c1 = control information, high order bits co = control information, low order bits sto = stop condition 1 2 3 4 5 6 7 8 9 10 14 11 12 13 45 44 15 19 16 17 18 sta chip address ($ca) ack ack first data byte (c1 or fm) data ack stop scl sda
pin circuit schematics motorola MC44BC374T1 technical data 21 15 pin circuit schematics figure 6. pin schematics vccd 50 1/2 vccd vccd 25k 1/2 vccd 5k sda scl xtal spllflt ack 11.8k audio 10k prem 50k audio in video 500 tv out vcc 1.5k vcc 25k vcc vcc vcc vcc vcc tvovcc 75 vcc vcc 5k vcc 10k 10k stby vcc pllflt vcc 2k vcc 100
22 MC44BC374T1 technical data motorola application and case diagrams 16 application and case diagrams 16.1 proposed bicmos modulator application figure 7. proposed MC44BC374T1 application schematic tvout o 2.2k 22nf 1nf 10nf 47nf vcc o this document contains information on a new product under development. motorola reserves the right to change or discontinue this product without notice. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 scl sda 4mhz vcc pre-em o o o gndd vccd pllflt gnd video tvovcc spllflt sda scl stby tvout vcca audio o video hi/lo o 10nf 100nf 220nf 100nf cx 22nf 470pf 75 xtal gnd preem audio 10nf o note 1: cx value depends on crystal characteristics; cx = 27pf on motorola application board. note 1 15k note 2 note 2: loop filter components must be as close as possible to pins 14 and 15 220k note 3 note 3: the 220k pull down resistor set the stby pin ? open ? condition to ? standby mode ? . if not connected, the ? open ? condition is ? normal mode ?
application and case diagrams motorola MC44BC374T1 technical data 23 16.2 packaging instructions tape and reel packaging per 12mrh00360a with the following conditions applicable for dual in-line sop (soic) package. 16.3 marking instructions : component orientation: arrange parts with the pin 1 side closest to the tape's round sprocket holes on the tape's trailing edge. 1stline: 44bc374t1 for MC44BC374T1 device (part number coded on 10 digits) 2nd line: assembly site code aw (2 digits) followed by the wafer lot code l (1 digit), year y (1 digit) and work week ww (2 digits) bar marked part way accross pin 1 end of package. bar width 10 to 20 mils, length to be at least four times bar width. bar placement may extend across chamfer and dimple areas. pin 1 dot or dimple m44bc374t1
24 MC44BC374T1 technical data motorola application and case diagrams figure 8. so16nb package dim millimeters inches min max min max a 1.35 1.75 0.054 0.068 a1 0.1 0.25 0.004 0.009 d 9.8 10 0.385 0.393 e 5.8 6.2 0.229 0.244 e1 3.8 4 0.150 0.157 b 0.35 0.49 0.014 0.019 c 0.19 0.25 0.008 0.009 e 1.27 bsc 0.050 bsc l 0.4 1.25 0.016 0.049 h 0.25 0.5 0.010 0.019 q 0 o 7 o 0 o 7 o note: 1. dimensions and tolerances per asme y14.5m, 1994. note: 2. controlling dimension: millimeters. note: 3. dimension d and e1 do not include mold protrusion. note: 4. maximum mold protrusion 0.15 (0.006) per side. note: 5. dimension b does not include dambar protrusion. allowable dambar protrusion shall be 0.127 (0.005) total in excess of the b dimension at maximum material condition.
application and case diagrams motorola MC44BC374T1 technical data 25
MC44BC374T1/d how to reach us: usa/europe/locations not listed: motorola literature distribution; p.o. box 5405, denver, colorado 80217 1-303-675-2140 or 1-800-441-2447 japan: motorola japan ltd.; sps, technical information center, 3-20-1, minami-azabu minato-ku, tokyo 106-8573 japan 81-3-3440-3569 asia/pacific: motorola semiconductors h.k. ltd.; silicon harbour centre, 2 dai king street, tai po industrial estate, tai po, n.t., hong kong 852-26668334 technical information center: 1-800-521-6274 home page: http://www.motorola.com/semiconductors information in this document is provided solely to enable system and software implementers to use motorola products. there are no express or implied copyright licenses granted hereunder to design or fabricate any integrated circuits or integrated circuits based on the information in this document. motorola reserves the right to make changes without further notice to any products herein. motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation consequential or incidental damages. ? typical ? parameters which may be provided in motorola data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including ? typicals ? must be validated for each customer application by customer ? s technical experts. motorola does not convey any license under its patent rights nor the rights of others. motorola products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the motorola product could create a situation where personal injury or death may occur. should buyer purchase or use motorola products for any such unintended or unauthorized application, buyer shall indemnify and hold motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that motorola was negligent regarding the design or manufacture of the part. motorola and the stylized m logo are registered in the u.s. patent and trademark office. all other product or service names are the property of their respective owners. motorola, inc. is an equal opportunity/affirmative action employer. ? motorola, inc. 2002

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