SGS Thomson Microelectronics TDA7435D Datasheet
DIGITALLY CONTROLLED AUDIO PROCESSOR
WITH LOUDSPEAKERS EQUALIZER
INPUT
- FOURHIGHPASS CHANNELS
- TWOAUX STEREO CHANNELS
VOLUME CONTROL IN 1dB STEPS WITH
GAIN UPTO 15dB
SOFTMUTE AND DIRECT MUTE
FOURAUXILIARYCHANNELS:
- TWOSPEAKERSCONTROL IN 1dB STEP
- TWOCHANNELS MULTIPLEXEDWITH
THEHIGH PASSCHANNELS
ALL FUNCTIONS PROGRAMMABLE VIA SE-
2
RIAL I
DESCRIPTION
The audioprocessor TDA7435 is an upgrade of
the TDA731X audioprocessorfamily.
Due to a highly linear signal processing, using
CMOS-switching techniques instead of standard
bipolar multipliers, very low distortion and very
low noiseare obtained.
CBUS
TDA7435
SO28
ORDERING NUMBER: TDA7435D
A second programmable high pass filtering providesthe loudspeakersequalization.
The soft Mute function is implemented andcanbe
activatedin twoways:
1 Viaserial bus(Mute byte,bit D0)
2 Directlyon pin 3 through an I/Oline of the mi-
crocontroller
Very low DC stepping is obtained by use of a
BICMOStechnology.
BLOCK DIAGRAM
CSM
HP FL 1
HP FL 2
HP FR 1
HP FR 2
HP RL 1
HP RL 2
HP RR 1
HP RR 2
AUX 2 INL
AUX 2 IN R
AUX 1 INL
AUX 1 IN R AUX 1 OUT R
22
HP FILTER
21
20
HP FILTER
19
18
HP FILTER
17
16
HP FILTER
15
6
7
1
2
0-15dB/1dB step
SOFT
MUTE
GAIN
SDA SCL DGND AGND CREF V
3
2
I
C BUS SUPPLY
MUX
ATTENUATOR
0/-79dB
ATTENUATOR
0/-79dB
CC
282324252627
12
10
11
13
14
9
8
5
4
D96AU437A
OUT REF
HP FL OUT
HP FR OUT
HP RL OUT
HP RR OUT
AUX 2 OUT L
AUX 2 OUT R
AUX 1 OUT L
November 1996
1/10
TDA7435
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
T
amb
T
stg
PIN CONNECTION
Operating Supply Voltage 10.5 V
Operating Ambient Temperature -40 to85 °C
Storage Temperature Range -55 to150 °C
AUX 1 INL
AUX 1 INR
CSM
AUX 1 OUT R
AUX 1 OUT L
AUX 2 INL
AUX 2 INR
AUX 2 OUT R
AUX 2 OUT L HP FR 1
HP FL OUT HP FR 2
HP FR OUT
OUT REF
HP RL OUT HP RR 1
1
2
3
4
5
6
7
8
9
10
12
13
28
27
26
25
24
23
22
21
20
19
18
17
16
1514HP RR OUT HP RR 2
D96AU438
V
CC
SDA
SCL
DGND
AGND
CREF
HP FL 1
HP FL 2
HP RL 111
HP RL 2
THERMAL DATA
Symbol Parameter Value Unit
R
th j-amb
Thermal ResistanceJunction-pins 65 °C/W
QUICK REFERENCE DATA
Symbol Parameter Min. Typ. Max. Unit
V
S
V
CL
THD Total Harmonic DistortionV = 1Vrms f = 1KHz 0.01 0.08 %
S/N Signal to Noise Ratio 106 dB
S
C
2/10
Supply Voltage 6 9 10.2 V
Max. input signal handling 2.1 2.6 Vrms
Channel Separation f = 1KHz 80 dB
Input Gain AUX1 1dB step 0 15 dB
TDA7435
ELECTRICALCHARACTERISTICS (VS= 9V; RL= 10KΩ;Rg=50Ω;T
=25°C; all gains= 0dB;
amb
f = 1KHz. Refer to the test circuit, unless otherwisespecified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
INPUTSTAGE:AUX1
G
G
G
R
V
S
I MIN
I MAX
step
E
V
CL
a
DC
Input Resistance 24 33 42 KΩ
I
Clipping Level d ≤ 0.3% 2.1 2.6 V
Input Separation 70 80 dB
I
Minimum InputGain -0.75 0 0.75 dB
Maximum Input Gain 13.75 15 16.25 dB
Step Resolution 0.5 1.0 1.5 dB
Set Error -1.25 0 1.25 dB
DC Steps Adiacent Gain Steps 0.5 10 mV
to G
G
IIN
IMAX
2.5 mV
SPEAKERATTENUATORS - AUX 1
C
A
RANGE
A
step
MUTE
E
A
V
DC
Control Range 79 dB
Step Resolution Av = 0 to -40dB 0.5 1 1.5 dB
Output Mute Attenuation Data Word = 1111XXXX 80 105 dB
Attenuation Set Error Av = 0 to -40dB 1.5 dB
DC Steps Adjacent Attenuation Steps 0 3 mV
AUDIO OUTPUT(Pin 4 - 5, 8 - 9, 10 - 14)
V
clip
R
L
R
O
V
DC
Clipping Level d = 0.3% 2.1 2.6 Vrms
Output Load Resistance 2 K
Output Impedance 20 30 100
DC VoltageLevel 3.5 3.8 4.1 V
STAGE:AUX2
R
V
CL
S
G
Input Resistance 24 33 42 K
I
Clipping Level 2.1 2.6 Vrms
Input Separation 70 80 dB
I
Gain -0.75 0 0.75 dB
I
Input Mute 80 100 dB
RMS
Ω
Ω
Ω
STAGE:HP FILTER
R1 Resistanceat pin HP1 HIGHPASSBYTE
R2 Resistanceat pin HP2 1 MΩ
V
CL
Clipping Level d ≤ 0.3% 2.1 2.6 Vrms
D3 = 1 XXXX1XXX
120 170 220 KΩ
SOFTMUTE
A
T
T
MUTE
DON
DOFF
Mute Attenuation 40 50 dB
ON Delay Time C
=22nF; 0 to-20dB; I =I
CSM
CSM = 22nF;0 to-20dB; I = IMIN 10 30 50 ms
C
0.7 1 2 ms
MAX
OFF Current VCSM =0V;I= IMAX 60 160 µA
CSM = 0V;I =IMIN 110 210 µA
V
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