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U4255BM
AM/FM Receiver IC
Description
The U4255BM is an integrated AM/FM front end circuit in BICMOS technology. It contains a double conversion system for FM and an up/down conversion circuit for AM (IF1 = 10.7 MHz, IF2 = 450 kHz). A complete automatically aligned high performance AM/FM tuner can be built together with the PLL U4256BM. This ICs are designed for high performance car radio applications. Electrostatic sensitive device. Observe precautions for handling.
Features
D FM-double conversion system D Integrated second IF filter with software controlled bandwidth D Completely integrated FM demodulator D Soft mute and multipath noise cancellation D Receiving condition analyzer D AM up/down conversion system D AM preamplifier with AGC and stereo capability D 3-wire bus controlled D Stop signal generation for AM and FM D Automatic alignment possible
Block Diagram
AMPLPF MX1OA IF1FMI MX2OB IF1AMI V3 IF2IN MX1OB IF1REF IF1OUT MX2IN MX2OA V3P 8 7 AMAGC 6 AMVREG AGC 43 44 38 39 33
AM FM
IF2OUT 20
30 29 26
23 24
28
27
AM dem. MX1AMA MX1AMB 41 3 AM V3 AGC
32
OPLPF
36 35
IFAGCL IFAGCCH
GNDMX MX1FMB MX1FMA
4 2 1 FM AGC Automatic adjustment 37 FMADJ
OSCOUT
16
Divider Adj. chan. OSC V3 Bus Bandgap 22 MX2LO 10 ADJAC
Multi- path 11 FM dem. Soft mute
GNDOSC
15
Stop
MPX
OSCE 14 OSCB 13
INT 21 40 INT MULTIP 34 SMUTE
Dev. ana. 31 DEV
12 25 42 9 17 18 19 5 GND EN DATA FMAGC METER V57 VS CLK
Figure 1. Block diagram
Ordering Information
Extended Type Number U4255BM-AFN U4255BM-AFNG3 Rev. A1, 26-Jun-00 Package SSO44 SSO44 Remarks Tube Taped and reeled 1 (12)
U4255BM
MX1FMA MX1FMB MX1AMB GNDMX FMAGC AMVREG AMAGC AMPLPF METER 1 2 3 4 5 6 7 8 9 44 43 42 41 40 39 38 37 36 35 34 33 32 MX1OB MX1OA VS MX1AMA MULTIP IF1REF IF1FMI FILADJ IFAGCL IFAGCH SMUTE IF1AMI OPLPF
ADJAC 10 MPX 11 V57 12 OSCB 13 OSCE 14 GNDOSC 15 OSCOUT 16 EN 17 CLK 18 DATA 19 IF2OUT 20 INT 21 MX2LO 22
14856
31 DEV 30 IF1OUT 29 28 27 26 25 24 23
Figure 2. Pinning
V3 IF2IN V3P MX2IN GND MX2OA MX2OB
2 (12)
A A A A AA AAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A A A A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A AAAAAA A A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA A A A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAA AAAAAAAAA A A A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A A A AAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA A A A AAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A AAAAAAAAAAAAAAAA A AAAAAA A AAAAAAAAAAA A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A A AAAAAAAAAAAAAAAA A AAAAAA A AAAAAAAAAAAAAAA A A A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAA AA AAAAAAAAAAA A A A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA A A A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA A A A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A A A AAAAAAAAAAA AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A AAAAAA A A AAAAAAAAAAAAAAAA A AAAAAA A AAAAAAAAAAA A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA A AAAAAA A AAAAAAAAAAAAAAAA A A A AAAAAAAAAAA A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A A A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A AAAAAAAAAAAAAAAA A AAAAAA A AAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA AA AAAAAAAAAAA A A A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA A AAAAAA A AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAA A A A A A A AAAAAAAAAAAAAAAA A AAAAAAAAAAA A A A AAAAAAAAAAAAAAAA AAAAAA A AAAAAAAAAAAAAAAA A A AAAAAAAAAAAAAAAA A AAAAA A AAAAAAAAAAA A AAAAAAAAAAAAAAAA AA AAAAAAAAAAA A A A AAAAAAAAAAAAAAAA AAAAAA AAAAAA A AAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAA A A
Rev. A1, 26-Jun-00
Pin Description
Pin Symbol Function 1 MX1FMA 1st mixer FM input A 2 MX1FMB 1st mixer FM input B 3 MX1AMB 1st mixer AM input B 4 GNDMX Ground 1st mixer 5 FMAGC FM preamplifier AGC 6 AMVREG AM control voltage 7 AMAGC AM preamplifier AGC 8 AMPLPF AM AGC LP filter 9 METER Fieldstrength output 10 ADJAC Adjacent channel detection output 11 MPX Multiplex signal 12 V57 5.7 V reference voltage 13 OSCB Oscillator basis 14 OSCE Oscillator emitter 15 GNDOSC Oscillator ground 16 OSCOUT Oscillator output 17 EN 3-wire bus enable 18 CLK 3-wire bus clock 19 DATA 3-wire bus data 20 IF2OUT 2nd IF amplifier output 21 INT Interrupt, stop signal, test out 22 MX2LO 10.25 MHz input for 2nd mixer 23 MX2OB 2nd mixer output B 24 MX2OA 2nd mixer output A 25 GND Ground 26 MX2IN 2nd mixer input 27 V3P 3 V reference for AMPIN, AMIFAGC, Control, IF2IN 28 IF2IN 2nd IF amplifier input 29 V3 3 V reference for IF1OUT, MX2IN 30 IF1OUT 1st IF amplifier output 31 DEV Deviation detect output 32 OPLPF Operating point LPF 33 IF1AMI 1st IF AM amplifier input 34 SMUTE Soft MUTE control input 35 IFAGCH IF AGC LP filter high time 36 IFAGCL IF AGC LP filter low time constant 37 FILADJ Filter adjust 38 IF1FMI 1st IF FM amplifier input 39 IF1REF 1st IF & MX1OUT reference, MX1AM A, MX1AM B 40 MULTIP Multipath detection output 41 MX1AMA 1st mixer AM input A 42 VS Supply voltage 43 MX1OA 1st mixer output A 44 MX1OB 1st mixer output B
AAAA A A AAAA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AA AA A AAAA A A A A A A AAAA A A A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAA A A A A A AA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA AA A AAAAAAA A A A A AA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAA A AA A
Test conditions (unless otherwise specified): VS = 8.5 V, Tamb = 25C For AC parameters: fiRF = 100 MHz, Rg = 50 W , fMOD = 0.4 kHz, f = " 75 kHz, fIF = 450 kHz, reference point Pin 4
AAAAA A A A A AAAAA AAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A A A A A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAA
Thermal Resistance
All voltages are referred to GND (Pin 25)
Rev. A1, 26-Jun-00
Electrical Characteristics
All voltages are referred to GND (Pin 25)
Operating Range
Absolute Maximum Ratings
Third order input intercept point Input resistance
Parameters Test Conditions / Pins Supply voltage Pin 42 Supply current Pin 42 AM Mixer (10.7 MHz) DC supply current Conversion conductance ioif/virf Maximum IF output Pins 43 and 44 Third order input intercept point Input resistance Pin 41 AM-1st IF Amplifier (10.7 MHz) Input resistance Pin 33 1st IF amplifier gain RL = 330 W Pins 30 to 33 Preamplifier control range Mixer 2 (450 kHz) DC supply current Conversion conductance ioif2/viif1 Maximum IF output Pins 23 and 24 Output impedance
Supply voltage range Ambient temperature
Junction ambient
Parameters Supply voltage Pin 42 Power dissipation Junction temperature Ambient temperature range Storage temperature range
Parameters soldered to PCB
Parameters
Pin 42
Symbol VS Tamb
Symbol RthJA
Symbol VS Ptot Tj Tamb Tstg
Symbol VS IS
Sm2 voIF Ro Co IP3 Ri
Sm1 voIF IP3
Ri G
Min. 7.5 -40
Min.
10
Value 10 800 150 -40 to +85 -50 to +150
Value 80
Typ. 8.5
Typ. 8.5
10 2 8 1 3 133 330
18 4.1 8 133 2.5
U4255BM
16 26
Max. 10 +85
Max. 10 70
Unit K/W
Unit V mW C C C
mA mA/v vpp MW pF dBV W
mA mA/v vpp dBV kW
Unit V C
Unit V mA
kW dB dB
3 (12)
AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAAAAA A A A AAA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAA AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAA AAAAA A A AAAA A A A A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A AAAAAA AAAAAAAAAAAAAAAAAAAAAAAA AAAAA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA A AAAA A A A A AAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA A AAAA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAAA A A AAAA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAAA AAAAA A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAA A A A A AAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AAAA A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAA A A A A AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AA A AAAA AA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA A A A A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA AAAA A A A A A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAA AAAA A A A AAAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAA AAA A
Test conditions (unless otherwise specified): VS = 8.5 V, Tamb = 25C For AC parameters: fiRF = 100 MHz, Rg = 50 W , fMOD = 0.4 kHz, f = " 75 kHz, fIF = 450 kHz, reference point Pin 4
Electrical Characteristics (continued)
U4255BM
4 (12) Parameters Test Conditions / Pins Symbol 2nd IF Amplifier (450 kHz) Input resistance Pin 28 Ri IF preamplifier gain Pins 28 to 20 G Preamplifier control range Oscillator (Pin 15, GND, connected to external oscillator components) Oscillator range Rg (Pin 13) = 220 W, VLOB Q of Losc = 70, VLOE RL1 = 520 W VLObuf Frequency range fOSC Harmonics Pin16 Output resistance Pin 16 RLO FM Mixer Third order intercept point Load impedance: IP3 RL43, 44 = 200 W Conversion transconductance gc Noise figure NFdsb Input resistance Pins 1 to 2 Ri 1, 2 Input capacitance Pins 1 to 2 Ci 1, 2 Input 1 resistance to ground f = 100 MHz Pin 1 Ri1 Input 1 capacitance to ground f = 100 MHz Pin 1 Ci1 Input 2 resistance to ground f = 100 MHz Pin 2 Ri2 Input 2 capacitance to ground f = 100 MHz Pin 2 Ci2 Output capacitance to GND Pins 43, 44 Co 43, o44 1st IF FM Amplifier Digitally adjustable gain 3 bit, 10.7 MHz Gmin Gmax Input resistance Pin 38 Ri38 Output resistance Pin 30 Ro30 Temperature coefficient of Gmin, Bit 66 = 0 TKmin the gain at Gmin Temperature coefficient of Gmax, Bit 66 = 1 TKmax the gain at Gmax FM Demodulator (Pin 11) Output voltage viPin 23, 24 = 40 mV vMPX f = 450 kHz Deviation = 22.5kHz, fMOD = 1 kHz Total distortion Bandwidth 2nd IF filter = 120 kHz, deviation = 75 kHz Min. 70 70 0.039 19 30 330 330 0.044 Typ. 140 120 160 100 90 0.3 7 10 1.6 5 1.2 9 1.6 7 5 70 3 43 37
Rev. A1, 26-Jun-00 Max. 220 160 -15 dBmV mA/v dB kW pF kW pF kW pF pF dB/K dB dB W W dB/K mV mV mV MHz dBc W Unit mV kW dB dB %
AA A A AA A A A AAAAAAAAAAA A AA A AA AA AA A AA A AA A AA A A AAAAAAAAAAA A AA A AA AAAAAAAAAAA A AA A AA A A AAAAAAAAAAA AAAAAAAAAAA AAAAAAAAAAA AAAAAAAAAA A A AA AAAAAAAAAAA AAAAAAAAAAA AAAAAAAAAAA AAAAAAAAAA A AA AAA AAAAAAAAAA A AA AAA AA AAAAAAAAAA AAAAA AAA AAAA AAA AA AAA AAAAAAAAAA AAAAAAAAAA AAAAAAA AAAAAA AAAAAAAAAA AAAAAAAAAA A AA AA AA A A A A A A A AA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAA AA AAAA AAA AA A AAAA AAA AAAAAAA AAAA AAAA AA A AAAA AAA AA AA AA AA A A A A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAA A AAAA AAAA AA A AAAA AAA AAAAAAAAAAAA AAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAA A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A AA A AA AAAAAA AA A A AAAAA AA A A A A AA A AA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAA A AAA AAAA AA AAA AAA AAA AA A AAA AAAA AA AAA AAA AAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAA A AAA AAAA AA AAA AAA A A AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
Data Transfer
101 ADDR. MSB A8_101 100 ADDR. MSB A8_100 101 ADDR. MSB A24_101 AM/FM/WB Gain-FM IF-amplifier 1A 0 AM 0 FM ADDR. A24_100 MSB BYTE 3 BYTE 1 BYTE 1
Optimize Test WBDemod-Gain
Rev. A1, 26-Jun-00
3-Wire Bus Description
EN
DATA
DATA
EN
e.g., R-Divider
CLK
24-bit command
8-bit command
CLK
LSB
B72
BYTE 3
B93
LSB
B9
0
20
B4
0
MPoff
B71
21
B92
B8
Band width
B3
22
Start Smute
B70
B91
Mute
B7
BYTE 1
BYTE 1
23
B69
B90
B2
NK-Sensor
B6
24
LSB
LSB
LSB
LSB
B68
B89
B1
25
B5
R-Divider
Smute
MSB
Search
MSB
B67
B0
26
B88
MSB
MSB LSB
27
Tk-fmzf
Width of window
B87
B66
28
B86
29
FM AGC
B65
BYTE 2
BYTE 2
Figure 3. Pulse diagram
B85
2 10
B64
2 11
OSC-divider/multipath sensitivity
B84
BYTE 2
AM-AGC
B63
2 12
B83
B62
2 13 2 14
B82
FM BW IF2
B61
LSB
LSB
B81
MSB LSB
2 15 P-2 0 P-2 1 P-2 2
B60
Field strength
MSB
B80
IF2 center frequency
MSB
B59
Status 0
B58
BWmpx.
B79
OSCB
B57
BYTE 3
Time window stop signal
B78
IPD4 IPD2
IPD3 IPD1
B56
BYTE 1
U4255BM
BYTE 1 MP FS
B77
B55
B76
Addr.
0
FM ext
MSB
B54
0
B75
Not used
B53
B74
14857
x
5 (12)
LSB LSB B52 B73 x
U4255BM
Bus Timing
tR Enable tS tR Data tHDA tS tR Clock tF tHEN tF
tF
tH
tL
96 11826
Figure 4. Bus timing
Bus Control
The operating mode is set by the Bits 92 and 93 AM/FM/Weather Channel Standby FM AM Weather band Bit 93 0 0 1 1 Bit 92 0 1 0 1 Bit 88 switches the search mode on/off Station Search Receive Search Bit 88 0 1
The Bits 89 to 91 control gain of the FM IF amplifier Gain FM-IF 19 dB 21 dB 23 dB 25 dB 27 dB 28 dB 29 dB 30 dB Bit 91 0 0 0 0 1 1 1 1 Bit 90 0 0 1 1 0 0 1 1 Bit 89 0 1 0 1 0 1 0 1
Bits 88 to 87 select the search-stop deviation from the center frequency Search-Stop Window 0.5 kHz 1.1 kHz 2.3 kHz 4.8 kHz 10 kHz 20 kHz 40 kHz 80 kHz Bit 87 0 0 0 0 1 1 1 1 Bit 86 0 0 1 1 0 0 1 1 Bit 85 0 1 0 1 0 1 0 1
6 (12)
Rev. A1, 26-Jun-00
U4255BM
In AM mode (Bits 92 and 93), Bits 81 to 83 set the divide factor of the AM prescaler
Divider AM Mixer 1 Divide by 10 Divide by 6 Divide by 7 Divide by 8 Divide by 4 Bit 93 1 1 1 1 1 Bit 92 0 0 0 0 0 Bit 84 Bit 83 0 0 0 1 1 Bit 82 0 0 1 0 0 Bit 81 0 1 0 0 1 64
The stop counter calculates an average center frequency during the time wich is set by the Bits 73 to 78
Time Window for Stop Signal 1 3.1969 ms ..... 3.1969 ms 1 1 1 1 1 1 Bit 78 Bit 77 Bit 76 Bit 75 Bit 74 0 0 0 0 0 Bit 73 1
The demodulator gain for the weather band mode is set by the Bits 71 and 72 Demodulator Gain in Weather Band Mode 5 10 20 50 Bit 72 0 0 1 1 Bit 71 0 1 0 1
In FM mode and in weather band mode (bit 92), the Bits 81 to 83 set the divide factor at the prescaler
Sensitivity Multipath Off Low Bit 93 x x x x x x x Normal x x x x x x x x High x Bit 92 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Bit 84 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Bit 83 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 Bit 82 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Bit 81 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
For soft mute, the MPX signal level will be reduced depending on the input signal strength. Bits 68 to 70 set the input signal field strength, at which the MPX signal will be reduced by 3 dB (for soft mute). The absolute value depends on the IF-gain Bit 89 - 91. Start Soft Mute at low fieldstrength Bit 70 0 0 0 0 1 1 1 1 Bit 69 0 0 1 1 0 0 1 1 Bit 68 0 1 0 1 0 1 0 1
Bit 80 switches between narrow band field strength information and wide band field strength information
at high fieldstrength
Field strength Narrow Band / Wide Band Low field strength (wide band) Field strength from AGC (narrow band)
Bit 80 0 1
Bit 67 sets the maximum reduction of the MPX signal level
Max Value of Soft Mute 30 dB 26 dB
Bit 67 0 1
Bit 79 controls the bandwidth of the lowpass filter of the MPX output Bandwidth MPX Lowpass Filter 90 kHz 180 kHz Bit 79 0 1
Temperature coefficient setting of FM IF amplifier Temperature Coefficient (TC) of the IF amplifier TK 1 TK 2 Bit 66 0 1
Rev. A1, 26-Jun-00
7 (12)
U4255BM
Level Control of the FM AGC threshold FM AGC Threshold 103 dBmV 97 dBmV 92 dBmV 85 dBmV Bit 65 0 1 0 1 Bit 64 0 0 1 1 Setting of the center frequency of the integrated FM band filter and demodulator IF Center 450.00 kHz 456.25 kHz 461.50 kHz 468.75 kHz 475.00 kHz 481.25 kHz 487.50 kHz 493.75 kHz 450.00 kHz 443.75 kHz 437.50 kHz 431.25 kHz 425.00 kHz 418.75 kHz 412.50 kHz 406.25 kHz Bit 59 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 Bit 58 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 Bit 57 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Bit 56 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
Level Control of the AM AGC threshold AM AGC Threshold 102 dBmV 105 dBmV 107 dBmV 108 dBmV Bit 63 0 1 0 1 Bit 62 0 0 1 1
Bits 60 and 61 control the bandwidth of the 2nd mixer output tank, in FM mode FM Bandwidth Mixer 2 150 kHz 200 kHz 250 kHz 450 kHz Bit 61 0 1 0 1 Bit 60 0 0 1 1
Function of Pin 20 setting is done by Bit 55 Pin 21: IF out/ Field Strength for Multipath 2nd IF output Multipath field strength Bit 55 0 1
Setting Bit 54 = 1 enables the use of an additional external band filter (Pin 23/24 to Pin 28), in FM mode 2nd IF Filter Internal filter External and internal filter The Bits 52 and 53 are not used. Bit 54 0 1
8 (12)
Rev. A1, 26-Jun-00
U4255BM
Test Circuit
50 1 2 3 4 50 5 470 6 V VS 7 8 9 10 11 12 13 14 15 16 V 17 Bus 18 19 20 V 21 22
14906
Test point 44 VS 43 42 41 40 50 39 38 37 36 35 34 33 32 31 30 29 28 50 27 26 25 24 VS 23
Figure 5. Test circuit
50
VS
50 Pin 29
V3 Pin 29
50
Rev. A1, 26-Jun-00
9 (12)
R 106 MP1 UG10V C 308 MP2 DPLPF 100nF C 202 MP9 C 208 220nF R 303 2.2k W C 309 C 307 6 10nF 7 C 204 C 207 220nF C 310 R 111 200kW 1.5nF R 152 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 10 W C 40 220 nF 1 3 KF302 450kHz 470nF C 113 C 112 10 m F R8 1kW R 104 470 W R 105 10 W 1 R 10 C 114 C 303 220nF 47pF F131 3 1nF C 110 4.7n F 7 D 131 10nF BB804 R 121 68k W R 131 5.6kW C 134 20 19 18 17 16 15 14 C 155 100nF C 117 R 112 C 104 C 106 10nF 10pF L 102 2.2 m H F101 6 T101 BFR93A 100nF 1 D 101 BB804 C 102 D 103 S391D 10nF C 103 R 122 68kW FMV 3 R 151 8.2kW C 152 330pF C 151 10nF C 157 10nF 100 m F MP6 R 103 680 W L 301 5 mH C 301 10pF D 301 S391D C 115 D 302 S391D 100nF C 116 100nF MPX MP7 ADJ MP8 FELD 4 C 311 7 R 113 10kW T301 BC858C 47kW 10.25 MHz 13 12 11 Q151 C 156 10nF C 153 22pF C 154 22pF F102 2 BB804 C 107 18pF 1 D 102 68kW 3 R 102 6.8pF FM0 1 22pF C 133 6.8pF MP12 EN 10 m F 22n F C 108 C 109 C 304 C 131 C 132 C 44 R 11 2.2kW 220 nF 390W 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 MP4 IF2 MP5 STOP MP10 DATA MP11 CLOCK T302 BC858C 100 nF 10 m F 10nF C 205 C 206 C 312 10nF 2 4 220nF F302 AM/ZF2 100nF KR202 10.7 MHz 10nF 6 2 C 209 3 10nF L7 68 m H C 306 15pF 270pF 68 m H C 313 L8 AM/ZF1 F201 1 100nF KR201 10.7MHz 10kW C 201 R 202 4 1nF R 201 270 W C 203 C 313 HUB MP3 10 W
U4255BM
Application Board Schematic
10 (12)
7
L9
2.2m H
R 12
2.7kW
U4255BM
T301 BC848C
MPF102 J109
R 16
47 W
470k W
Figure 6. Application board schematic
10nF 1nF
C 53
C 54
220 nF
1nF
U4256BM
1 2 3 4 5 6 7 8 9 10
3.9pF
Rev. A1, 26-Jun-00
14522
U4255BM
Package Information
Package SSO44
Dimensions in mm
18.05 17.80 9.15 8.65 7.50 7.30
2.35 0.3 0.8 16.8 44 23 0.25 0.10
0.25 10.50 10.20
technical drawings according to DIN specifications 13040
1
22
Rev. A1, 26-Jun-00
11 (12)
U4255BM
Ozone Depleting Substances Policy Statement
It is the policy of TEMIC Semiconductor GmbH to 1. Meet all present and future national and international statutory requirements. 2. Regularly and continuously improve the performance of our products, processes, distribution and operating systems with respect to their impact on the health and safety of our employees and the public, as well as their impact on the environment. It is particular concern to control or eliminate releases of those substances into the atmosphere which are known as ozone depleting substances (ODSs). The Montreal Protocol (1987) and its London Amendments (1990) intend to severely restrict the use of ODSs and forbid their use within the next ten years. Various national and international initiatives are pressing for an earlier ban on these substances. TEMIC Semiconductor GmbH has been able to use its policy of continuous improvements to eliminate the use of ODSs listed in the following documents. 1. Annex A, B and list of transitional substances of the Montreal Protocol and the London Amendments respectively 2. Class I and II ozone depleting substances in the Clean Air Act Amendments of 1990 by the Environmental Protection Agency (EPA) in the USA 3. Council Decision 88/540/EEC and 91/690/EEC Annex A, B and C (transitional substances) respectively. TEMIC Semiconductor GmbH can certify that our semiconductors are not manufactured with ozone depleting substances and do not contain such substances.
1.
We reserve the right to make changes to improve technical design and may do so without further notice. Parameters can vary in different applications. All operating parameters must be validated for each customer application by the customer. Should the buyer use TEMIC Semiconductors products for any unintended or unauthorized application, the buyer shall indemnify TEMIC Semiconductors against all claims, costs, damages, and expenses, arising out of, directly or indirectly, any claim of personal damage, injury or death associated with such unintended or unauthorized use. Data sheets can also be retrieved from the Internet: http://www.temic-semi.com
TEMIC Semiconductor GmbH, P.O.B. 3535, D-74025 Heilbronn, Germany Telephone: 49 (0)7131 67 2594, Fax number: 49 (0)7131 67 2423
12 (12)
Rev. A1, 26-Jun-00

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