SGS Thomson Microelectronics TDA7420 Datasheet
MULTIFUNCTIONAUDIO PROCESSOR
CASSETTEPREAMPLIFIER:
FORWARD/REVERSE INPUTS GROUND
COMPATIBLE
INTERNALSWITCHES FOR EQUALIZATION
INTERNALADJUSTMENTFOR TRAKING
INTERNALADJUSTMENTFOR OUTPUT
AMS:
INPUTGAINCONTROL
ADJUSTABLEGAINVERSUSFREQUENCY
TDA7420
TQFP 64(14x14)
AUDIOPROCESSOR:
INPUTS:1 FULLYDIFFERENTIAL, 1 DIFFERENTIAL, 1 STEREOAND 1 MONO
INPUTGAINFROM 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
FOURINDEPENDENT OUTPUTSTAGES:
- ATTENUATIONCONTROL FROM
0 TO -79dB (1dB STEP)
- BEEPCONTROL (ON/OFF, FRONT/REAR)
STEREO DECODER:
ROLL-OFFADJUSTMENT
SELECTABLEDEEMPHASIS
19KHzCANCELLATION
HIGHCUT CONTROL
STEREOBLEND
NOISE BLANKER
AUTOMATIC THRESHOLD CONTROL AND
PROGRAMMABLE TRIGGERTHRESHOLD
INTEGRATEDHIGHPASSFILTER
PACKAGE:TQFP64(14x14)
ORDERING NUMBER: TDA7420
DESCRIPTION
The TDA7420 I
audio processor contains all signal processing
blocks of a high performance car radio, including
audioprocessor, stereodecoder, noise blanker,
differentmute functions,cassettepreamplifierand
AMS function.
The use of BICMOS technologyallows 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
BICMOStechnology.
2
C bus controlled multifunction
May 1998
1/29
TDA7420
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
T
amb
T
stg
PIN CONNECTION
Operating Supply Voltage 10 V
Operating Temperature Range -40 to 85 °C
Storage Temperature Range -55 to 150 °C
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
V
CC
SDA
SCL
AC_IN1_L
CSM
1
2
3
4
5
6
7
8
9
10
12
13
14
15
16
17 18 19 20 21
AGND
DIGGND
CREF
VHCC
AM_RR1L1
COMPOSIT
AM_L
59 58 57 56 5455 53 52 51 50 49
6061626364
22 23 24 25 26
VR
HCL
VSB AM_C
HCR
TRIGGER OUT
CD_L+
PEAK
TBLANK
CD_L-
CD_R-
CD_R+
VCC_PRE
PREOUT_R
271128 29 30 31 32
VCO
AMS_IN
AMS_LF
INTP
AMS_GAIN
EQRO
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
INTS
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
D94AU182
THERMALDATA
Symbol Parameter Value Unit
R
th j-pins
Thermal ResistanceJunction-pins max 85 °C/W
2/29
BLOCK DIAGRAM
TDA7420
LR_OUT
LF_OUT
RR_OUT
RF_OUT
34
35
36
37
-79
-79
-79
MUTE
1dB
-63
+16 ÷
-79
1dB
1dB
0 ÷
0 ÷
&
RADIO MUTE
+18
1dB
BASS
-18 ÷
+
1dB
MUTE
(IN, OUT)
100K
-6dB
0.5dB
0÷
-6dB
0.5dB
0÷
1dB
1dB
0 ÷
0 ÷
CS4
AC_IN2_R
9863765410121311
AC_IN2_L
AC_OUT2_L
AC_OUT2_R
TR_R
TR_L
BASS2_R
BASS2_L
BASS1_L
BASS1_R
100KΩ
S
AMS OUT
V
CC
V
DOLBY B/C
INTS
INTP
AMS_GAIN
AC_IN1_L
AC_IN1_R
AMS_IN
AC_OUT1R
AC_OUT1L
AMS_LF
L1 R1
33313064 32
129
2
32850404941
PREOUT_RPREOUT_L
-23dB/
0/-20dB/
-23dB/
0/-20dB/
MUTE
MUTE
+
SOFT
+18
TREBLE
-18 ÷
VOLUME
BEEP
DIG GND
SCL
SDA
38
C BUS
2
I
DECODER
BUS LATCHES
AMS
GAIN 0÷28dB 1dB
G
L
HCL
21
171516
CUT
HIGH
50 - 75
NOISE
19KHz
&
DEMODULATOR
FM/AM
15dB
1dB step
0 ÷
R
+
MUTE
MULTIPLEXER
HCR
20
-5dB
CONTROL
µsec
DEEMPH
BLANKER
25KHz
CANCELLATION
AMPLITUDE ADJ
VHCCVRVSB
LEVEL
CONTROL
THRESHOLD
9dB
2.5dB
1.5 ÷
221923
CONTROL
PLL
MUTE
TRIGGER_
24
PEAK DETECTOR +
RECTIFIER
COMP
OUT
PULSE FORMER
SUPPLY
D94AU106I
14 - November - 1995
TBLANKPEAK
27 25
456KHz
AGND CREF VCO
1814 62 26
VCC
RADIO MUTE
EQROEQLO
CC_PRE
V
51
(Nom)
5% step
3.8K
45
GND_PRE
RM
RM
42434439464748
INL1
INL2
EQLI
EQSW
INR1
INR2
EQRI
53
CD_R-
0dB
0dB
20K
20K
20K
20K
50K
52
CD_R+
55
50K
CD_L+
545657
L1
CD_L-
100K
100K
R1
25K
25K
25K
25K
58
59
AM_R GAIN
AM_C
25K
25K
25K
60
61
AM_L
COMPOSIT
3/29
TDA7420
ELECTRICALCHARACTERISTICS (VS= 8.5V; T
amb
=25°C; RL= 10KΩ; all gains = 0dB; f = 1KHz;
unless otherwise specified, refer to the Test Circuit.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
INPUT SECTION
DifferentialInput Pins 52,53, 54, 55
R
V
CL
CMRR Common Mode Rejection Ratio 45 55 dB
DIFF Differential Gain -1 0 1 dB
G
Input Resistance 37 50 63 KΩ
I
Clipping Level THD = 0.3% 2.0 2.5 Vrms
StereoInput Pins56, 57
R
V
CL
Input Resistance 75 100 125 KΩ
I
Clipping Level 2.0 2.5 Vrms
QuasiDifferentialInput Pins58, 59,60
R
V
CL
Input Resistance 18 25 32 KΩ
I
Clipping Level 2.0 2.5 Vrms
CompositeInput Pin 61
R
V
CL
Input Resistance 18 25 32 K
I
Clipping Level 2.0 2.5 Vrms
MULTIPLEXER
G
G
G
R
IMIN
IMAX
STEP
V
DC
O
Output Resistance(pin 2,3) 100 200 300
Minimum Gain -1 0 1 dB
Maximum Gain 14 15 16 dB
Step Resolution 0.5 1 1.5 dB
Dc Steps Adjacent Gain Step -5 1 5 mV
MINto GMAX 2mV
G
Ω
Ω
VOLUME CONTROL
R
C
MAX
A
MAX
STEPC Step Resolution Coarse
A
E
A
E
T
V
DC
Input Resistance (1, 64) 24 33 42 KΩ
I
Max Gain 15 16 17 dB
Max Attenuation 63 dB
Attenuation
Attenuation Set Error G =16 to -40dB -1.5 0 1.5 dB
Tracking Error 2dB
DC Steps Adjacent Attenuation Steps -3 0.1 3 mV
SOFTMUTE
A
MUTE
t
D
Mute Attenuation 40 50 dB
Delay Time C
BASS CONTROL
C
RANGE
A
STEP
R
B
Control Range +15 +18 +20 dB
Step Resolution 0.5 1 1.5 dB
Internal Feedback Resistance 48 65 82 KΩ
AV= 16to -40dB 0.5 1.0 1.5 dB
from 0dB to A
= 22nF; I= I
EXT
MAX
0 to -20dB; I = I
MAX
MIN
0.5 5 mV
1.0 ms
23 ms
4/29
TDA7420
ELECTRICALCHARACTERISTICS (continued.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
TREBLE CONTROL
C
RANGE
A
STEP
T Internal Feedback Resistance 37 50 63 KΩ
R
SPEAKERATTENUATORS
C
RANGE
A
STEP
A
MUTE
E
A
V
DC
AUDIO OUTPUTS
V
CLIP
R
L
R
OUT
V
DC
GENERAL
E
NO
S/N Signal toNoise Ratio All gains 0dB; V
d Distortion V
S
C
E
T
Control Range +17 +18 +19 dB
Step Resolution 0.5 1 1.5 dB
Control Range 79 dB
Step Resolution AV= 0to -40dB 0.5 1 1.5 dB
Output MuteAttenuation 80 100 dB
Attenuation Set Error AV= 0to -40dB 1.50 dB
DC Step Adjacent Attenuation Steps 0.1 3 mV
Clipping Level d = 0.3% 2.0 2.5 V
Output LoadResistance 2 KΩ
Output Impedance 100 200 300 Ω
DC VoltageLevel 3.35 3.6 3.85 V
Output Noise BW = 20Hz to 20KHz, flat
Output Muted
All gains = 0dB
=1V
I
; 0.01 0.08 %
RMS
O =1VRMS ; 106 dB
4.0
5.0 15
Channel Separation Left/Right 80 95 dB
Total Tracking Error AV= 0to -20dB; 0 1 dB
A
= -20to -40dB; 0 2 dB
V
RMS
µ
µV
V
BUS INPUT
V
IL
V
IH
I
IN Input Current VIN = 0.4V -5 5 µA
V
O
Input Low Voltage 1V
Input High Voltage 3 V
Output VoltageSDA
IO= 1.6mA 0.1 0.4 V
Acknowledge
SUPPLY
V
IL
I
S
SVR Ripple Rejection
Supply Voltage 6.5 8.5 10.0 V
Supply Current Stereo Decoder = ON 25 33 41 mA
Stereo Decoder = OFF 20 28 35 mA
Audioprocessor 80 dB
C
=22µF
ref
StereoDecoder + Audioprocessor 60 dB
5/29
TDA7420
PREAMPLIFIER(VS=8.5V; T
amb
=25°C; RIN= 600Ω; unlessotherwisespecified(see testcircuit)
Symbol Parameter Test Condition Min. Typ. Max. Unit
R
V
out DC
R
O
I
I
VO Open Loop Gain f = 400Hz 110 dB
G
G
V
N Resistance Normal Position 50 250 500 Ω
R
R
MLR
Input Resistance 100 KΩ
I
Output VoltageDC (pin 40, 50) 3.2 3.5 3.9 V
Output Resistance(pins 40,50) 100 200 300 Ω
Input BiasCurrent 10
Closed LoopGain NAB short 31 32.5 34 dB
Resistance Metal Position
2.85 3.8 4.75 KΩ
(left ,right)
R
MR
R
Mmax
R
Mmin
Step Resolution (versus RM)5%
Maximum Value for R
M
3.42 4.56 5.7 KΩ
Minimum Valuefor RM 2.28 3.04 3.8 KΩ
Dolby LevelControl Control Range 5.5 6.0 6.5 dB
Step Resolution 0.25 0.5 0.75 dB
S
R
e
N
Slew Rate NAB Short 1 V/µs
Total Input Noise RIN=600Ω; unweighte d 0.8 µV
R
=600Ω;CCIR warn 0.5
IN
IN=0;unweighted 0.45 µV
R
Output AttenuationControl D1, D0 = 00 -0.75 0 0.75 dB
D1, D0 = 01 -20 dB
D1, D0 = 10 -23 dB
D1, D0 = 11 -80 dB
THD Total Harmonic Distortion V
SVR
C
S Channel Separation(L to R) 45 60 dB
C
CT
Ripple Rejection 75 dB
1
Channel Cross talk (F to R) 60 80 dB
S/N Signal to Noise V
= 1V; f = 1KHz metal 0.02 %
O
V
= 1V; f = 1KHz normal 0.02 0.1 %
O
V
= 1V; f = 10KHz metal 0.05 %
O
V
= 1V; f = 10KHz normal 0.04 %
O
O = 2V; f = 1KHz %
V
= 388mV; metal; CCIR arm 65 dB
O
A
µ
V
µ
AUDIO MUSIC SENSOR
IAMSOUT AMS Output Current 5 mA
VAMS
6/29
R
i-29
V
TH1
V
TH2
AMS
V
INTP
V
INTS
S
R
i-30
G
AMS Output Low Level IAM
OUT
= 2mA 500 800 mV
OUT
Input Resistance AMS Gain (pin 23) 75 100 125 KΩ
Interprogram Threshold Voltage 1.2 1.45 1.7 V
Interspace Threshold Voltage 4.8 5.2 5.6 V
AMS ThresholdLevel 2.0 2.8 3.6 V
th
INTP Output Voltage I
INTS Output Voltage I
= 2mA 0.2 0.8 mV
OUT
= 2mA 0.2 0.8 mV
OUT
INTP Charge Current 50 70 150
INTS Charge Current 50 70 150 µA
Gain Sensitivity min Gain V30vs V
max Gain V
30
vs V
29
29
11 dB
42 dB
AMS Gain Resistance D6, D5 = 00 13 17.5 22 KΩ
D6, D5 = 01 16.5 22 27.5 K
D6, D5 = 11 75 100 125 KΩ
A
µ
Ω
TDA7420
STEREO DECODER PART
ELECTRICAL CHARACTERISTICS (V
age on pin 61 (composite):V
I = 1.5dB;T
G
Symbol Parameter Test Condition Min. Typ. Max. Unit
SVRR Supply Voltage Ripple Rejection V
V
O
α ChannelSeparation V
THD Total Harmonic Distortion 0.02 0.3 %
S + N
=27°C;unless otherwise specified)
amb
DC Output Voltage(HCL, HCR) 3.95 4.25 4.55 V
Signal Plus Noise toNoise Ratio f = 20Hz to 16KHz;
MPX
=0.5V
N
MONO/STEREOSWITCH
V
V
INTH
INTH
Pilot Threshold Voltage for stereo ”ON” Pth=1
Pilot Threshold Voltage for stereo ”OFF” Pth =1
STEREOBLEND
V
SB-VR
Control Voltage for Channel
Separation
HIGH CUT CONTROL
τ
deemp
R
HCC
De-Emphasis Time Constant CL,CR=1nF;STDDS= 0
High Cut Control Resistance V
VCO
f
OSC
∆f/f Capture and Hold Range 0.5 1 %
Oscillator Frequency 456 KHz
= 8.5V; de-emphasis time: T = 50µs; nominal MPX input volt-
S
(75KHzdeviation);modulation frequency= 1KHz;
RMS
= 100mV; f =1KHz 50 65 dB
RIPPLE
SB-VR
=100mV
DC
50 dB
91 dB
S=2V
RMS
P
th =0
19
8
P
12
=0
th
= 6dB; (note 5) -300 -250 -200 mV
α
16
16
26
14
22
2234mV
2028mV
α = 26dB; -80 mV
43 50 57
V
HCC-VR
C
L,CR
V
HCC-VR
HCC-VR
V
HCC-VR
= 100mV
=1nF;STDDS= 1
64 75 86 µs
=100mV
=100mV;STDDS=0 43 50 57 K
=-0.5V(note5) 115 150 185 KΩ
mV
mV
µ
RMS
RMS
RMS
RMS
s
Ω
CARRIERAND HARMONIC SUPPRESSIONAT THE OUTPUT
α19 Pilot Signal f= 19KHz 40 55 dB
α38 Subcarrier f =38KHz 75 dB
α57 Subcarrier f =57KHz 62 dB
76 Subcarrier f = 76KHz 90 dB
α
INTERMODULATION (note1)
2f
α
3f
α
= 10KHz; f
mod
= 13KHz; f
mod
= 1KHz 65 dB
spur
= 1KHz 75 dB
spur
TRAFFIC RADIO (note 2)
57 Signal f = 57KHz 70 dB
α
SCA - SUBSIDIARY COMMUNICATIONS AUTHORIZATION (note3)
67 Signal f = 67KHz 75 dB
α
ACI - ADJACENTCHANNEL INTERFERENCE(note4)
α114 Signal f = 114KHz 95 dB
190 Signal f = 190KHz 84 dB
α
7/29
TDA7420
NOTES TO THE CHARACTERISTICS
1 INTERMODULATION SUPPRESSION
α2 =
α3 =
(
V
signal)(at1KHz
O
V
(spurious)(at1KHZ)
O
(signal)(at1KHz)
V
O
(
V
spurious)(at1KHZ
O
)
;f
= (2x 10KHz) - 19KHz
s
;f
= (3x 13KHz) - 38KHz
s
)
measuredwith : 91% monosignal; 9% pilot signal; fm=10KHzor 13KHz.
2. TRAFFICRADIO(V.F.) suppression
α57 (V.W.F.)=
V
O(signal)
(spurious)(at1KHZ ±23Hz)
V
O
(at1KHz)
measuredwith : 91% stereosignal; 9% pilotsignal; fm=1KHz; 5% subcarrier
(f=57KHz,fm = 23Hz AM,m = 60%)
3. SCA (SUBSIDIARYCOMMUNICATIONS AUTHORIZATION)
α67 =
V
O(signal)
V
(spurious)(at9KHZ)
O
(at1KHz)
;f
= (2 x 38KHz) - 67KHz
s
measuredwith : 81% monosignal; 9% pilot signal; fm=1KHz;
10% SCA - subcarrier(f
= 67KHz, unmodulated).
s
4. ACI (ADJACENTCHANNEL INTERFERENCE)
α114 =
α190 =
V
O(signal)
(spurious)(at4KHZ)
V
O
V
O(signal)
(spurious)(at4KHZ)
V
O
(at1KHz)
(at1KHz)
;f
= 110KHz- (3x 38KHz)
s
;f
= 186KHz- (5x 38KHz)-
s
measuredwith 90%mono signal; 9% pilot signal;fm = 1KHz; 1%spurioussignal
= 110KHzor 186KHz,unmodulated).
(f
s
5: Controlrange for HighCut Controland StereoBlend is V
Figure : High CutControl
f
8/29
c
(KHz)
3
2
1
0
-500 -400 -300 -200 -100 0 V
D94AU183
HCC-VR
- 400mV ≤ VSB,V
R
Figure: StereoBlend
SEP
(dB)
40
30
20
10
0
-400 -300 -200 -100 VSB-V
HCC≤VR
D94AU184
R
TDA7420
NOISE BLANKERPART
FEATURES:
INTERNAL 2nd ORDER 140KHz HIGH-PASS
FILTER
NOISE RECTIFIER OUTPUT FOR SIGNAL
QUALITYDETECTION
PROGRAMMABLETRIGGERTHRESHOLD
ADDITIONAL CIRCUITS FOR DEVIATION
AND FIELD STRENGTH -DEPENDENT TRIGGER ADJUSTMENT
BLANKING TIME PROGRAMMABLE BY EXTERNALCAPACITOR
VERY LOW OFFSET CURRENT DURING
HOLD TIME DUE TO OPAMPS WITH MOS
INPUTS
TRIGGER THRESHOLD DEPENDENT ON
HIGH FREQUENCY NOISE WITH PROGRAMMABLEGAIN
ELECTRICALCHARACTERISTICS (continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
TRMIN
V
TRMIN
V
TRSTEP
V
TRNOISE
V
PEAK
V
RECTDEV
V
RECTFS
T
I
OS
Trigger Threshold (*)1)minimum Measured with
NBT =000
V
= 1.2V
PEAK
D2onbyte2=1
D2onbyte2=0
100 15030200 mVp
Trigger Threshold1)maximum Measured with
NBT =111
V
= 1.2V
PEAK
D2onbyte2=1
D2onbyte2=0
130 18565250 mVp
Trigger Threshold Step Size 5 mVp
Noise Adjusted Trigger Threshold
Rectifier Voltage
D2onbyte2 =1
2)
Measured with
V
PEAK
D2 on byte 2 = 0
= 1.4V
NAT = 00
NAT = 01
NAT = 10
NAT = 11
VMPX = 0mV 0.9 V
= 50mV
V
MPX
140
180
240
280
1.5 V
f = 200KHz
V
MPX
= 100mV
2.0 V
f = 200KHz
Deviation Dependent Rectifier
Voltage
3)
Measured with
V
=500mV
MPX
(75KHzdev.)
OVD = 00(off)
OVD = 01
OVD = 10
OVD = 11
Field Strength Controlled Rectifier
Voltage
4)
Measured with
V
=0mV
MPX
V
=-500mV
SB-VR
(fullymono.)
Suppression PulseDuration CBLANK = 330pF 40
S
FSC = 00(off)
FSC = 01
FSC = 10
FSC = 11
Input Offset Current During
0.9
1.2
2.0
2.8
0.9
1.3
1.9
2.4
10 pA
Suppression Time
mVp
mVp
mVp
mVp
V
V
V
V
V
V
V
V
s
µ
(*) All thresholds are measured by using a pulse withTR=2µs, T
The repetition rate must notincrease the PEAK voltage.
1) NTB representsbits D0 - D2 of NB byte 1
2) NAT representsbits D3 - D4 of NB byte 1
3) OVD represents bits D5 -D6 of NB byte 1
4) FSC representsbits D0 - D1 of NB byte 2
=2µs and TF=10µs.
HIGH
V
DC-LEVEL
MPX
D94AU185
V
TH
TRT
HIGH
T
F
Time
9/29
Loading...