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TDA7420
MULTIFUNCTION AUDIO PROCESSOR
CASSETTE PREAMPLIFIER: FORWARD/REVERSE INPUTS GROUND COMPATIBLE INTERNAL SWITCHES FOR EQUALIZATION INTERNAL ADJUSTMENT FOR TRAKING INTERNAL ADJUSTMENT FOR OUTPUT AMS: INPUT GAIN CONTROL ADJUSTABLE GAIN VERSUS FREQUENCY AUDIOPROCESSOR: INPUTS: 1 FULLY DIFFERENTIAL, 1 DIFFERENTIAL, 1 STEREO AND 1 MONO INPUT GAIN FROM 0 TO 15dB (1dB STEP) VOLUME CONTROL FROM +16 TO -63dB (1dB STEP) BASS AND TREBLE CONTROL FROM -18 TO 18dB (1dB STEP) DIRECT MUTE, SOFT MUTE AND RADIO MUTE FOUR INDEPENDENT OUTPUT STAGES: - ATTENUATION CONTROL FROM 0 TO -79dB (1dB STEP) - BEEP CONTROL (ON/OFF, FRONT/REAR) STEREO DECODER: ROLL-OFF ADJUSTMENT SELECTABLE DEEMPHASIS 19KHz CANCELLATION HIGH CUT CONTROL STEREO BLEND NOISE BLANKER AUTOMATIC THRESHOLD CONTROL AND PROGRAMMABLE TRIGGER THRESHOLD INTEGRATED HIGH PASS FILTER PACKAGE: TQFP64 (14x14)
TQFP 64 (14x14)
ORDERING NUMBER: TDA7420
DESCRIPTION The TDA7420 I 2C bus controlled multifunction audio processor contains all signal processing blocks of a high performance car radio, including audioprocessor, stereodecoder, noise blanker, different mute functions, cassette preamplifier and AMS function. The use of BICMOS technology allows the implementation of several filter functions with switched capacitor techniques like fully integrated, adjustment free PLL Loop filter, pilot detector with integrator. This minimizes the number of external components. Due to a highly linear signal processing, using CMOS-switching techniques instead of standard bipolar multipliers, very low distortion and very low noise are obtained also in the stereodecoder part. Very low DC stepping is obtained by use of the BICMOS technology.
May 1998
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TDA7420
ABSOLUTE MAXIMUM RATINGS
Symbol VS Tamb Tstg Operating Supply Voltage Operating Temperature Range Storage Temperature Range Parameter Value 10 -40 to 85 -55 to 150 Unit V C C
PIN CONNECTION
COMPOSIT PREOUT_R
AC_IN1_L
VCC_PRE
CD_R+
CD_L+
CD_R-
CREF
AM_L
CSM
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 AC_IN1_R AC_OUT1_R AC_OUT1_L TREBLE_L TREBLE_R AC_OUT2_R AC_OUT2_L AC_IN2_L AC_IN2_R BASS2_R BASS1_R BASS2_L BASS1_L VCC SDA SCL 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 AGND TRIGGER OUT TBLANK AMS_LF AMS_IN HCR PEAK VCO VR INTP AMS_GAIN DIGGND VHCC INTS VSB HCL 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 EQRI INR2(FR) INR1(RR) GND_PRE INL1(RL) INL2(FL) EQLI EQLO PREOUT_L EQSW BEEP OUT_RL OUT_FL OUT_RR OUT_FR AMS_OUT
EQRO
D94AU182
THERMAL DATA
Symbol Rth j-pins Parameter Thermal Resistance Junction-pins Value max 85 Unit C/W
2/29
CD_L-
AM_C
AM_R
R1
L1
BLOCK DIAGRAM
DOLBY B/C 100K VCC VS
AMS_LF
AC_OUT1L
AC_OUT1R
AMS_IN
AC_IN1_R AC_IN1_L
AMS_GAIN
INTP
INTS
AMS OUT
BASS1_R BASS1_L
BASS2_L
BASS2_R TR_L
TR_R
AC_OUT2_R AC_OUT2_L
AC_IN2_L
V CC_PRE PREOUT_L CS4 63 40 11 0 / -79 1dB + TREBLE -18 / +18 1dB SOFT MUTE & RADIO MUTE 13 12 10 4 5 6 7 8 9 0/-20dB/ -23dB/ MUTE 0 / -79 1dB 0/-20dB/ -23dB/ MUTE 50 28 3 2 29 1 64 30 31 32 33 PREOUT_R 49
EQLO EQRO
51
41
GND_PRE
AC_IN2_R
L1
R1
45
3.8K (Nom) 5% step
37
LR_OUT
EQLI
42
RM RM
36
INL2
43
LF_OUT
INL1
44
EQSW 0/-6dB 0.5dB 0/-6dB 0.5dB 100K BASS -18 / +18 1dB
39
35 0 / -79 1dB 34 0 / -79 1dB
RR_OUT
INR1
46
INR2
47
VOLUME +16 / -63 1dB + MUTE (IN, OUT)
EQRI
48
RF_OUT
CD_RGAIN 0/28dB 1dB AMS
53
50K
CD_R+
52
20K
20K
0dB 38 L G BUS LATCHES I2 C BUS DECODER 16 15 17 BEEP SCL SDA DIG GND
CD_L+
55
50K 0 / 15dB 1dB step R FM/AM
20K
20K
0dB
CD_L-
54
L1 MULTIPLEXER + MUTE DEMODULATOR & AMPLITUDE ADJ
56
R1
57
21 -5dB 25KHz 19KHz CANCELLATION NOISE BLANKER HIGH CUT CONTROL
HCL
100K
100K
50 - 75 sec DEEMPH
HCR 20
25K GAIN 1.5 / 9dB 2.5dB PLL MUTE RECTIFIER SUPPLY RADIO MUTE 14 VCC AGND CREF 456KHz 18 62 27 VCO 26 PEAK 25 TBLANK
D94AU106I
AM_R
58
25K LEVEL CONTROL THRESHOLD CONTROL 23 19 22 VR VHCC VSB
AM_C
59
25K
25K
AM_L COMP
60
25K 24
COMPOSIT
61
25K
PEAK DETECTOR + PULSE FORMER
TRIGGER_ OUT
25K
14 - November - 1995
TDA7420
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TDA7420
ELECTRICAL CHARACTERISTICS (VS = 8.5V; Tamb = 25C; RL = 10K; all gains = 0dB; f = 1KHz; unless otherwise specified, refer to the Test Circuit.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
INPUT SECTION Differential Input Pins 52, 53, 54, 55
RI VCL CMRR GDIFF Input Resistance Clipping Level Common Mode Rejection Ratio Differential Gain THD = 0.3% 37 2.0 45 -1 50 2.5 55 0 1 63 K Vrms dB dB
Stereo Input Pins 56, 57
RI VCL Input Resistance Clipping Level 75 2.0 100 2.5 125 K Vrms
Quasi Differential Input Pins 58, 59,60
RI VCL Input Resistance Clipping Level 18 2.0 25 2.5 32 K Vrms
Composite Input Pin 61
RI VCL Input Resistance Clipping Level 18 2.0 25 2.5 32 K Vrms dB dB dB mV mV
MULTIPLEXER
RO GIMIN GIMAX GSTEP VDC Output Resistance (pin 2,3) Minimum Gain Maximum Gain Step Resolution Dc Steps Adjacent Gain Step GMIN to GMAX 100 -1 14 0.5 -5 200 0 15 1 1 2 300 1 16 1.5 5
VOLUME CONTROL
RI C MAX AMAX ASTEPC EA ET VDC Input Resistance (1, 64) Max Gain Max Attenuation Step Resolution Coarse Attenuation Attenuation Set Error Tracking Error DC Steps Adjacent Attenuation Steps from 0dB to AMAX -3 0.1 0.5 AV = 16 to -40dB G =16 to -40dB 0.5 -1.5 24 15 33 16 63 1.0 0 1.5 1.5 2 3 5 42 17 K dB dB dB dB dB mV mV
SOFT MUTE
AMUTE tD Mute Attenuation Delay Time CEXT = 22nF; 0 to -20dB; I = IMAX I = IMIN 40 50 1.0 23 dB ms ms
BASS CONTROL
C RANGE ASTEP RB Control Range Step Resolution Internal Feedback Resistance +15 0.5 48 +18 1 65 +20 1.5 82 dB dB K
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TDA7420
ELECTRICAL CHARACTERISTICS (continued.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
TREBLE CONTROL
CRANGE ASTEP RT Control Range Step Resolution Internal Feedback Resistance +17 0.5 37 +18 1 50 +19 1.5 63 dB dB K
SPEAKER ATTENUATORS
CRANGE ASTEP AMUTE EA VDC Control Range Step Resolution Output Mute Attenuation Attenuation Set Error DC Step AV = 0 to -40dB AV = 0 to -40dB Adjacent Attenuation Steps 0.5 80 79 1 100 0.1 1.5 1.50 3 dB dB dB dB mV
AUDIO OUTPUTS
VCLIP RL ROUT VDC Clipping Level Output Load Resistance Output Impedance DC Voltage Level d = 0.3% 2.0 2 100 3.35 2.5 200 3.6 300 3.85 VRMS K V
GENERAL
ENO Output Noise BW = 20Hz to 20KHz, flat Output Muted All gains = 0dB All gains 0dB; VO = 1VRMS ; VI = 1VRMS ; 80 AV = 0 to -20dB; AV = -20 to -40dB; 4.0 5.0 106 0.01 95 0 0 15 0.08 1 2 V V dB % dB dB dB
S/N d SC ET
Signal to Noise Ratio Distortion Channel Separation Left/Right Total Tracking Error
BUS INPUT
V IL VIH IIN VO Input Low Voltage Input High Voltage Input Current Output Voltage SDA Acknowledge 1 VIN = 0.4V IO = 1.6mA 3 -5 0.1 5 0.4 V V A V
SUPPLY
V IL IS SVR Supply Voltage Supply Current Ripple Rejection Cref = 22F Stereo Decoder = ON Stereo Decoder = OFF Audioprocessor Stereo Decoder + Audioprocessor 6.5 25 20 8.5 33 28 80 60 10.0 41 35 V mA mA dB dB
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TDA7420
PREAMPLIFIER (VS = 8.5V; Tamb = 25C; RIN = 600; unless otherwise specified (see test circuit)
Symbol RI Vout DC RO II GVO GV RN RMLR RMR RMmax R Mmin Parameter Input Resistance Output Voltage DC (pin 40, 50) Output Resistance (pins 40, 50) Input Bias Current Open Loop Gain Closed Loop Gain Resistance Normal Position Resistance Metal Position (left ,right) Step Resolution (versus RM) Maximum Value for RM Minimum Value for RM Dolby Level Control Slew Rate Total Input Noise Test Condition Min. 100 3.2 100 Typ. 3.5 200 110 32.5 250 3.8 5 3.42 2.28 5.5 0.25 4.56 3.04 6.0 0.5 1 0.8 0.5 0.45 0 -20 -23 -80 0.02 0.02 0.05 0.04 75 60 80 65 5.7 3.8 6.5 0.75 Max. 3.9 300 10 34 500 4.75 Unit K V A dB dB K % K K dB dB V/s V V V dB dB dB dB % % % % % dB dB dB dB
f = 400Hz NAB short
31 50 2.85
SR eN
Control Range Step Resolution NAB Short RIN= 600; unweighted RIN= 600; CCIR warn RIN= 0; unweighted D1, D0 = 00 D1, D0 = 01 D1, D0 = 10 D1, D0 = 11 VO = 1V; f = 1KHz metal VO = 1V; f = 1KHz normal VO = 1V; f = 10KHz metal VO = 1V; f = 10KHz normal VO = 2V; f = 1KHz
Output Attenuation Control
-0.75
0.75
THD
Total Harmonic Distortion
0.1
SVR1 CS CCT S/N
Ripple Rejection Channel Separation (L to R) Channel Cross talk (F to R) Signal to Noise
45 60 VO = 388mV; metal; CCIR arm
AUDIO MUSIC SENSOR
IAMSOUT VAMSOUT R i -29 VTH1 VTH2 AMSth VINTP VINTS AMS Output Current AMS Output Low Level Input Resistance AMS Gain Interprogram Threshold Voltage Interspace Threshold Voltage AMS Threshold Level INTP Output Voltage INTS Output Voltage INTP Charge Current INTS Charge Current Gain Sensitivity AMS Gain Resistance IAMOUT = 2mA (pin 23) 75 1.2 4.8 2.0 500 100 1.45 5.2 2.8 0.2 0.2 70 70 11 42 17.5 22 100 5 800 125 1.7 5.6 3.6 0.8 0.8 150 150 mA mV K V V V mV mV A A dB dB K K K
IOUT = 2mA IOUT = 2mA 50 50 min Gain V30 vs V29 max Gain V30 vs V29 D6, D5 = 00 D6, D5 = 01 D6, D5 = 11
SG Ri - 30
13 16.5 75
22 27.5 125
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TDA7420
STEREO DECODER PART ELECTRICAL CHARACTERISTICS (VS = 8.5V; de-emphasis time: T = 50s; nominal MPX input voltage on pin 61 (composite): VMPX = 0.5VRMS (75KHz deviation); modulation frequency = 1KHz; GI = 1.5dB; Tamb = 27C; unless otherwise specified)
Symbol SVRR VO THD Parameter Supply Voltage Ripple Rejection DC Output Voltage (HCL, HCR) Channel Separation Total Harmonic Distortion Signal Plus Noise to Noise Ratio f = 20Hz to 16KHz; S = 2VRMS VSB - VR = 100mVDC Test Condition VRIPPLE = 100mV; f = 1KHz Min. 50 3.95 Typ. 65 4.25 50 0.02 91 0.3 4.55 Max. Unit dB V dB % dB
S+N N
MONO/ STEREO SWITCH
VINTH VINTH Pilot Threshold Voltage Pilot Threshold Voltage for stereo "ON" Pth = 1 Pth = 0 for stereo "OFF" Pth = 1 Pth = 0 = 6dB; (note 5) = 26dB; 12 19 8 16 16 26 14 22 22 34 20 28 mVRMS mVRMS mVRMS mVRMS
STEREO BLEND
VSB-VR Control Voltage for Channel Separation -300 -250 -80 -200 mV mV s s K K
HIGH CUT CONTROL
deemp De-Emphasis Time Constant CL, C R = 1nF; STDDS = 0 VHCC - VR = 100mV CL, C R = 1nF; STDDS = 1 VHCC - VR = 100mV R HCC High Cut Control Resistance VHCC - VR = 100mV; STDDS = 0 VHCC - VR = -0.5V (note 5) 43 64 43 115 50 75 50 150 57 86 57 185
VCO
fOSC f/f 19 38 57 76 2 3 57 67 114 190 Oscillator Frequency Capture and Hold Range 0.5 456 1 KHz %
CARRIER AND HARMONIC SUPPRESSION AT THE OUTPUT
Pilot Signal f = 19KHz Subcarrier f = 38KHz Subcarrier f = 57KHz Subcarrier f = 76KHz 40 55 75 62 90 dB dB dB dB
INTERMODULATION (note 1)
fmod = 10KHz; fspur = 1KHz fmod = 13KHz; fspur = 1KHz 65 75 dB dB
TRAFFIC RADIO (note 2)
Signal f = 57KHz 70 dB
SCA - SUBSIDIARY COMMUNICATIONS AUTHORIZATION (note 3)
Signal f = 67KHz 75 dB
ACI - ADJACENT CHANNEL INTERFERENCE (note4)
Signal f = 114KHz Signal f = 190KHz 95 84 dB dB
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TDA7420
NOTES TO THE CHARACTERISTICS 1 INTERMODULATION SUPPRESSION 2 = 3 = VO (signal) (at1KHz) ; fs = (2 x 10KHz) - 19KHz VO (spurious) (at1KHZ) VO (signal) (at1KHz) ; fs = (3 x 13KHz) - 38KHz VO (spurious) (at1KHZ)
measured with : 91% mono signal; 9% pilot signal; fm=10KHz or 13KHz. 2. TRAFFIC RADIO (V.F.) suppression 57 (V.W.F.) = VO(signal) (at1KHz) (spurious) (at1KHZ 23Hz)
VO
measured with : 91% stereo signal; 9% pilot signal; fm=1KHz; 5% subcarrier (f=57KHz, fm = 23Hz AM, m = 60%) 3. SCA (SUBSIDIARY COMMUNICATIONS AUTHORIZATION) 67 = VO(signal) (at1KHz) ; fs = (2 x 38KHz) - 67KHz VO (spurious) (at9KHZ)
measured with : 81% mono signal; 9% pilot signal; fm=1KHz; 10% SCA - subcarrier (fs = 67KHz, unmodulated). 4. ACI (ADJACENT CHANNEL INTERFERENCE) 114 = 190 = VO(signal) (at1KHz) ; fs = 110KHz - (3 x 38KHz) VO (spurious) (at4KHZ) VO(signal) (at1KHz) ; fs = 186KHz - (5 x 38KHz) VO (spurious) (at4KHZ)
measured with 90% mono signal; 9% pilot signal; fm = 1KHz; 1% spurious signal (fs = 110KHz or 186KHz, unmodulated). 5: Control range for High Cut Control and Stereo Blend is VR - 400mV VSB, VHCC VR Figure : High Cut Control
fc (KHz)
D94AU183
Figure : Stereo Blend
SEP (dB) 40
D94AU184
3
30
2
20
1
10
0 -500 -400 -300 -200 -100 0 VHCC-VR
0 -400
-300
-200
-100
VSB - VR
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TDA7420
NOISE BLANKER PART FEATURES: INTERNAL 2nd ORDER 140KHz HIGH-PASS FILTER NOISE RECTIFIER OUTPUT FOR SIGNAL QUALITY DETECTION PROGRAMMABLE TRIGGER THRESHOLD TRIGGER THRESHOLD DEPENDENT ON HIGH FREQUENCY NOISE WITH PROGRAMMABLE GAIN ELECTRICAL CHARACTERISTICS (continued)
Symbol VTRMIN Parameter Trigger Threshold (*) 1) minimum Test Condition Measured with NBT = 000 VPEAK = 1.2V Measured with NBT = 111 VPEAK = 1.2V
2)
ADDITIONAL CIRCUITS FOR DEVIATION AND FIELD STRENGTH -DEPENDENT TRIGGER ADJUSTMENT BLANKING TIME PROGRAMMABLE BY EXTERNAL CAPACITOR VERY LOW OFFSET CURRENT DURING HOLD TIME DUE TO OPAMPS WITH MOS INPUTS
Min. 100
Typ. 150 30 185 65 5 140 180 240 280 0.9 1.5 2.0
Max. 200
Unit mVp
D2 on byte 2 = 1 D2 on byte 2 = 0 D2 on byte 2 = 1 D2 on byte 2 = 0 NAT NAT NAT NAT = 00 = 01 = 10 = 11
VTRMIN
Trigger Threshold 1) maximum
130
250
mVp mVp mVp mVp mVp mVp V V V V V V V V V V V s pA
VTRSTEP VTRNOISE
Trigger Threshold Step Size Noise Adjusted Trigger Threshold Measured with VPEAK = 1.4V D2 on byte 2 = 0 VMPX = 0mV VMPX = 50mV f = 200KHz VMPX = 100mV f = 200KHz
VPEAK
Rectifier Voltage D2 on byte 2 = 1
VRECTDEV
Deviation Dependent Rectifier Voltage 3)
Measured with VMPX = 500mV (75KHz dev.) Measured with VMPX = 0mV VSB-VR = -500mV (fully mono.) CBLANK = 330pF
OVD OVD OVD OVD FSC FSC FSC FSC
= 00(off) = 01 = 10 = 11 = 00(off) = 01 = 10 = 11
0.9 1.2 2.0 2.8 0.9 1.3 1.9 2.4 40 10
VRECTFS
Field Strength Controlled Rectifier Voltage 4)
TS IOS
Suppression Pulse Duration Input Offset Current During Suppression Time
(*) All thresholds are measured by using a pulse with TR = 2s, THIGH = 2s and TF = 10s. The repetition rate must not increase the PEAK voltage. 1) NTB represents bits D0 - D2 of NB byte 1 2) NAT represents bits D3 - D4 of NB byte 1
VMPX
3) OVD represents bits D5 - D6 of NB byte 1 4) FSC represents bits D0 - D1 of NB byte 2
DC-LEVEL VTH
D94AU185
Time TR THIGH TF
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TDA7420
DESCRIPTION DESCRIPTION OF THE NOISEBLANKER In the normal automotive environment the MPX signal is disturbed by ignition spikes, motors and high frequency switches etc. The aim of the noiseblanker part is to cancel the influence of the spikes produced by these components. Therefore the output of the stereodecoder is switched off for a time of 40s (average spike duration). In a first stage the spikes must be detected but to avoid a wrong triggering on high frequency noise a complex trigger control is implemented. Behind the triggerstage a pulse former generates the 40s "blanking" pulse. In the following section all of these circuits are described in their function and their programming, too (see fig.1). 1.1 Normal Trigger Path (RECT-PEAK, ACT, PEAK-COMP, BLANK-COMP, BIAS-MONO) The Incoming MPX signal is highpass-filtered, amplified and rectified (block RECT-PEAK). The second order highpass-filter has a corner-frequency of 140KHz. The gain of the rectifier can be controlled by the bit D2 of the noiseblanker byte2. If programming bit D2 to zero the gain is only half of the nominal value. All trigger thresholds must be roughly doubled in this case. The rectified signal, RECT, is used to generate by peak-rectification a signal called PEAK, which is available at the PEAK pin. Also noise with a frequency >100KHz increases the PEAK voltage. The value of the PEAK voltage influences the trigger threshold voltage Vth (block ATC). Both signals, RECT and PEAK+Vth are fed to a comparator (block PEAK-COMP) which outputs a sawtooth-sharped waveform at the TBLANK pin, it is triggered. A second comparator (block BLANK-COMP) forms the internal blanking duration of 40s. The noiseblanker is supplied by his own biasing circuit (block BIAS-MONO). 1.2 Automatic Threshold Control (ATC) There are two independent possibilities for programming the trigger threshold: a)the minimum threshold in 8 steps (bits D0-D2,
10/29
NB-byte 1) b)the maximum threshold in 4 steps (bits D3D4, NB-byte 1) (see fig.2) The low threshold is used in combination with a good MPX signal without any noise. The sensitivity in this operation is high, depending only on the programmed "Low Trigger Threshold", bits D0-D2 of the noiseblanker byte 1. It is independent of the PEAK voltage. The MPX signal is noisy (low fieldstrength) the PEAK signal increases due to the higher noise, which is also rectified (see part 1.1). With increasing of the PEAK voltage the trigger threshold voltage increases, too. This particular gain is programmable in 4 steps (see fig.2). 1.3 Automatic Threshold Control by the Stereoblend voltage (ATC-SB) Besides the noise controlled threshold adjustment there is an additional possibility for influencing the trigger. It is controlled by the difference between Vsb and Vr, similar to the Stereoblend. The reason for implementing such a second control will be explained in the following: The point where the MPX signal starts to become noisy is fixed by the RF part. Therefore also the starting point of the normal noise controlled trigger adjustment is fixed (fig.3). But in some cases the behaviour of the noiseblanker can be improved by increasing the threshold even in a region of higher fieldstrength, for the MPX signal often shows distortion in this range. Because of the overlap of this range and the range of the stereo/mono transition it can be controlled by Vsb and Vr. This threshold increase is programmable in 3 steps or switched off (see fig.3). 1.4 Over Deviation Detector (MPX-RECT) Sometimes when listening to stations with a higher deviation than 75KHz the noiseblanker triggers on the high frequency modulation. To avoid this blanking, which causes noise in the output signal, the noiseblanker offers a deviationdependent threshold adjustment. By rectifying the MPX signal a further signal representing the actual deviation is obtained. It is used to increase the PEAK voltage. Offset and gain of this circuit are programmable in 3 steps (the first step turns off the detector, see fig.4).
TDA7420
Figure 1: Block Diagram of the Noise Blanker
LEFT 80KHz LP SIGNAL PATH to INPUT SELECTOR of AUDIOPROC.
RIGHT
PEAK COMP RECT AUTOMATIC THRESHOLD CONTROL ATC + -
BLANK COMP REF. TRIGGER OUT CMOS OUTPUT STAGE
MPX IN
AMP
BUF
PEAK
PEAK+VTH
40s
40s
5 RECT-PEAK 1 4 I2C-BUS ADDITIONAL THRESHOLD CONTROL (ATC-SB, MPX_RECT)
VR VSB RPEAK 82K
D94AU189A
CPEAK 47nF
CBLANK 330pF
Figure 2: Trigger Threshold vs. Vpeak
VTH
280mV 240mV 180mV 140mV
TRIG. THRESHOLD 65mV 8 STEPS 30mV
NOISE ADJUSTED TRIG. THRESHOLD
0.9V
D94AU186B
1.4V
VPEAK(V)
11/29
TDA7420
Figure 3: Behaviour of the Field Strength Controlled Threshold Adjustment
VPEAK MONO STEREO
3G
TRIG. THRESHOLD
2.4V(11) 1.9V(10) 1.3V(01) ATC_SB OFF (00)
0.9V
NOISE
noisy signal
D94AU187B
good signal
E'
Figure 4: Behaviour of the Deviation Dependent Threshold Adjust (Over Deviation Detector)
VPEAK (V) OVM=11 OVM=10
2.8 2.0
OVM=01 1.2 0.9 DETECTOR OFF (00)
D94AU188
20
32.5
45
75
DEVIATION(KHz)
I2C BUS INTERFACE Interface Protocol The interface protocol comprises: A start condition (s) A chip address byte, (the LSB bit determines read/write transmission).
CHIP ADDRESS SUB ADDRESS
A subaddress byte A sequence of data (N-bytes + acknowledge) A stop condition (P)
DATA 1...DATA n
MSB
LSB
MSB
LSB
MSB
LSB
S
1
0
0
0
1
0
0 R/W ACK X
X
T
I
A3 A2 A1 A0 ACK
DATA
ACK P
ACK = Acknowledge S = Start P = Stop I = Autoincrement MAX CLOCK SPEED 500kbits/s Autoincrement If bit I in the subaddress byte is set to "1", the autoincrement of subaddress is enabled.
12/29
TDA7420
TRANSMITTED DATA (SEND MODE)
MSB X X X X X ST SM LSB AMS HIGH = Active
AMS = True Blank Detected SM = Soft mute activated ST = Stereo (HIGH = active)
SUBADDRESS (RECEIVE MODE)
MSB X X X I D3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 D2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 LSB D0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Mux Volume Treble Bass Speaker Attenuator LF Speaker Attenuator RF Speaker Attenuator LR Speaker Attenuator RR Mute & Beep Stereodecoder Noise Blanker 1 Noise Blanker 2 AMS Dolby Level Control Metal Resistance Control Preamplifier Attenuation FUNCTION
If bit in the subaddress byte is set to " 1", the autoincrement of subaddress is enabled
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TDA7420
INPUT SELECTOR
MSB D7 D6 D5 D4 D3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 D2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 D1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 LSB D0 Input Gain 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0dB 1dB 2dB 3dB 4dB 5dB 6dB 7dB 8dB 9dB 10dB 11dB 12dB 13dB 14dB 15dB Full diff CD Stereo Stereo Decoder AM quasi diff input Quasi diff CD Not allowed Not allowed AM Mono (AM R input) FUNCTION
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TDA7420
VOLUME
MSB D7 D6 D5 D4 D3 D2 0 0 0 0 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 0 1 0 1 0 1 0 1 0 1 D1 0 0 1 1 0 0 1 1 LSB D0 -1 dB STEPS 0 1 0 1 0 1 0 1 -0dB -1dB -2dB -3dB -4dB -5dB -6dB -7dB -8 dB STEPS 16dB 8dB 0dB -8dB -16dB -24dB -32dB -40dB -48dB -56dB Mute FUNCTION
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TDA7420
TREBLE
MSB D7 D6 D5 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 D4 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 D3 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 D2 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 D1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 LSB D0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 -18dB -17dB -16dB -15dB -14dB -13dB -12dB -11dB -10dB -9dB -8dB -7dB -6dB -5dB -4dB -3dB -2dB -1dB 0dB 0dB 1dB 2dB 3dB 4dB 5dB 6dB 7dB 8dB 9dB 10dB 11dB 12dB 13dB 14dB 15dB 16dB 17dB 18dB FUNCTION
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TDA7420
BASS
MSB D7 D6 D5 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 D4 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 D3 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 D2 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 D1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 LSB D0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 -18dB -17dB -16dB -15dB -14dB -13dB -12dB -11dB -10dB -9dB -8dB -7dB -6dB -5dB -4dB -3dB -2dB -1dB 0dB 0dB 1dB 2dB 3dB 4dB 5dB 6dB 7dB 8dB 9dB 10dB 11dB 12dB 13dB 14dB 15dB 16dB 17dB 18dB Non DC extended bass DC extended bass FUNCTION
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TDA7420
SPEAKERS ATTENUATORS
MSB D7 D6 D5 D4 D3 D2 0 0 0 0 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 0 1 0 0 1 1 0 0 1 1 0 0 0 1 1 Mute 0 1 0 1 0 1 0 1 0 1 D1 0 0 1 1 0 0 1 1 LSB D0 -1dB STEPS 0 1 0 1 0 1 0 1 0dB -1dB -2dB -3dB -4B -5dB -6dB -7dB 8dB STEPS 0dB -8dB -16dB -24dB -32dB -40dB -48dB -56dB -64dB -72dB LF, LR, RF, RR
MUTE & BEEP
MSB D7 D6 D5 D4 D3 D2 D1 LSB D0 1 0 1 0 0 1 0 1 1 0 1 1 1 0 0 0 0 0 FUNCTION Soft Mute - FAST SLOPE Soft Mute - Slow Slope Soft Mute OFF Soft Mute ON Direct Input Mute ON Direct Input Mute OFF Radio Mute ON Radio Mute OFF Composit Input Enabled Composit Mute Enabled Beep ON - Front Beep ON - Rear VCO OFF VCO ON
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TDA7420
STEREO DECODER
MSB D7 D6 D5 D4 D3 D2 D1 0 0 1 1 0 0 0 1 1 1 1 0 1 1 0 0 1 0 1 1 0 0 1 1 1 0 1 0 1 0 1 LSB D0 Input Gain 0 1 0 1 1.5dB Input Gain 4.0dB Input Gain 6.5dB Input Gain 9dB Input Gain Roll Off Adjustement 20.2% 21.9% 23.7% 25.5% 27.3% 29.2% 31% Deemph. Time Constant 75s Deemph. Time Constant 50s Forced Mono Stereo Enabled Pilot Threshold High Pilot Threshold Low FUNCTION
NOISE BLANKER 1
MSB D7 D6 D5 D4 D3 D2 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 D1 0 0 1 1 0 0 1 1 LSB D0 0 1 0 1 0 1 0 1 Vth = 30mV Vth = 35mV Vth = 40mV Vth = 45mV Vth = 50mV Vth = 55mV Vth = 60mV Vth = 65mV Vth = 140mV Vth = 180mV Vth = 240mV Vth = 280mV Gain of Overdeviation Detector Vpeak with MPX of 75KHz Deviation Detector Off Vpeak = 1.2Vop Vpeak = 2.0Vop Vpeak = 2.8Vop FUNCTION Noise Blanker Threshold Vpeak = 0.9V
Noise Blanker Noise Adjusted Threshold Vpeak = 1.4V
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TDA7420
NOISE BLANKER 2
MSB D7 D6 D5 D4 D3 D2 D1 0 0 1 1 1 0 LSB D0 0 1 0 1 Control Off Vpeak = 1.3V Vpeak = 1.9V Vpeak = 2.4V Noise Blanker Gain Low High FUNCTION
Field Strenght Controlled Rectifier Voltage (control by Vsb-Vr) Vpeak at Vsb-Vr = -500mV (fully Mono)
AMS
MSB D7 D6 D5 D4 D3 D2 D1 0 0 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 1 0 1 0 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 LSB D0 0 1 0 1 0dB -1dB -2dB -3dB Gain Sensitivity Tuning 0dB 10dB 14dB 18dB 22dB 26dB 30dB 34dB AC Sensitivity Tuning 22dB f = 1.1KHz SW1 = SW2 = SW3 34dB f = 1.1KHz not allowed 21dB f = 160Hz AMS ON AMS OFF FUNCTION Att. Sensitivity Tuning
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TDA7420
DOLBY LEVEL CONTROL
MSB D7 D6 D5 D4 D3 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 0 0 1 1 0 0 1 1 0 0 1 1 X 0 1 0 1 0 1 0 1 0 1 0 1 X D2 0 0 0 0 1 1 1 1 0 0 0 0 1 D1 0 0 1 1 0 0 1 1 0 0 1 1 X LSB D0 Right Channel 0 1 0 1 0 1 0 1 0 1 0 1 X 0dB -0.5dB -1.0dB -1.5dB -2.0dB -2.5dB -3.0dB -3.5dB -4.0dB -4.5dB -5.0dB -5.5dB -6.0dB Left Channel -0dB -0.5dB -1.0dB -1.5dB -2.0dB -2.5dB -3.0dB -3.5dB -4.0dB -4.5dB -5.0dB -5.5dB -6.0dB FUNCTION
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TDA7420
METAL RESISTANCE CONTROL
MSB D7 D6 D5 D4 D3 1 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 D2 0 0 0 0 0 1 1 1 1 D1 0 0 0 1 1 0 0 1 1 LSB D0 Right Channel 0 0 1 0 1 0 1 0 1 R metal +20% R metal +15% R metal +10% R metal +5% R metal =3.8K Typical R metal - 5% R metal - 10% R metal - 15% R metal - 20% Left Channel R metal +20% R metal +15% R metal +10% R metal +5% R metal =3.8K Typical R metal - 5% R metal - 10% R metal - 15% R metal - 20% FUNCTION
PREAMPLIFIER
MSB D7 D6 D5 D4 D3 D2 D1 0 0 1 1 0 1 LSB D0 0 1 0 1 0dB -20dB -23dB Mute Reverse Mode On Forward Mode On FUNCTION Attenuation control
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TDA7420
PINS: 1, 64 PINS: 2, 3,6,7,
VCC V CC 20A
VCC 20A
GND
GND
33K
50K
GND
Vcc/2
D95AU267
D95AU268
VCC/2
PINS: 40, 50
PINS: 8, 9
VCC
VCC 20A 205
V CC 20A
33K
GND GND
D95AU269
D95AU270
GND
Vcc/2
PINS: 10, 12
VCC 20A
PINS: 11, 13
VS 20A
GND PIN 11 PIN 13
GND 65K
65K BASS-LB
D95AU271A
BASS-RB
D95AU272
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TDA7420
PIN: 15 PIN: 16
20A
20A
GND
GND
D95AU273
GND
D95AU274
PIN: 19
VCC 20A 40A
PINS: 20, 21
VCC
205 VCC GND 4K
VCC 25K GND 75K
GND
D95AU275
GND
GND
D95AU276
GND
PIN: 22
VCC 20A 40A
PIN: 23
VCC 20A
40A
205
GND
205
VCC
GND 16K
GND
D95AU277
D95AU278
GND
GND
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TDA7420
PIN: 24 PIN: 25
VCC
VCC
VCC 35A 40A
205
205
GND
D95AU279
GND
GND
GND
D95AU280
PIN: 26
PIN: 27
VCC
VCC VCC 40A 280 V CC V CC
VCC
4K
6K
50A
500
2K
100A
GND
500 GND
D95AU281
GND
56K
D95AU282
PIN: 28
VCC VCC 20A
PINS: 29, 56, 57
VCC 20A
12K
GND GND VCC 20A
12K
100K GND
GND
VCC/2
D95AU284
D95AU283
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TDA7420
PIN: 30 PIN: 31
VCC
VCC
VCC
10K
GND
100K
GND
D95AU285
GND
GND
D95AU286
GND
PIN: 32
PIN: 33
VCC
VCC
VCC
29K
GND
GND
GND
GND GND
D95AU287
GND
D95AU288
GND
PINS: 34, 35, 36, 37
VCC
PINS: 38
VCC
205 24
20A 50K
GND 20A
GND
50K GND
D95AU289
VCC/2
D95AU290
GND
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TDA7420
PINS: 39 PINS: 41,49
VCC
VCC
VCC 4.56K
VCC
205
224K GND GND
GND
GND
D95AU291
D95AU292
PINS: 42, 48
PINS: 43, 44, 46, 47
VCC 20A 205
VCC
GND
GND GND
D95AU293
PIN 43, 44 PIN 46, 47
D95AU294
PINS: 52, 53
PINS: 54, 55
VCC
VCC
50K GND
50K GND PIN 52 PIN 53
D95AU295
VCC/2 20K
20A
PIN 54 PIN 55
20K
20K VCC/2
20K
D95AU296
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TDA7420
PINS: 58, 60 PIN: 59
VCC 20A 25K
VCC
VCC 25K 25K VCC/2
20A
20A GND
GND
25K
GND
D95AU297
D95AU298
PIN: 61
PIN: 62
VCC
VCC 20A
VCC 20K
25K GND
20K
D95AU299
VCC/2
GND
GND
D95AU300
PIN: 63
VCC 20A
10K
1.7K
GND
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GND
GND
GND
D95AU301
TDA7420
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a trademark of STMicroelectronics (c) 1998 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - France - Germany - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A.
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