SGS Thomson Microelectronics TDA7342 Datasheet
DIGITALLY CONTROLLED AUDIO PROCESSOR
INPUTMULTIPLEXER
- TWOSTEREOANDONEMONO INPUTS
- ONEQUASI DIFFERENTIAL INPUT
- SELECTABLEINPUT GAIN FOR OPTIMAL
ADAPTATIONTO DIFFERENT SOURCES
FULLY PROGRAMMABLE LOUDNESS
FUNCTION
VOLUME CONTROL IN 0.3dB STEPS INCLUDING GAINUP TO20dB
ZERO CROSSINGMUTE, SOFT MUTE AND
DIRECT MUTE
BASS AND TREBLE CONTROL
FOURSPEAKERATTENUATORS
- FOURINDEPENDENT SPEAKERS
CONTROLIN 1.25dBSTEPSFOR
BALANCEAND FADER FACILITIES
- INDEPENDENTMUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
2
RIAL I
DESCRIPTION
The audioprocessor TDA7342 is an upgrade of
the TDA731X audioprocessorfamily.
Due to a highly linear signal processing, using
CMOS-switching techniques instead of standard
CBUS
TDA7342
TQFP 32
ORDERING NUMBER: TDA7342
bipolar multipliers, very low distortion and very
low noise are obtained.Several new features like
softmute, and zero-crossing mute are implemented.
The soft Mute function can be activated in two
ways:
1 Via serial bus(Mute byte, bit D0)
2 Directly on pin 21 through an I/O line of the
microcontroller
Very low DC stepping is obtained by use of a
BICMOStechnology.
November 1999
1/14
TDA7342
BLOCK DIAGRAM
BUS
R2
4.7K
C17 100nF
C11
C19 2.7nF
TREBLE(L)
C18
100nF
BIN(L)
BOUT(L)
SM
LOUD(L)
C13 47nF
OUT(L) IN(L)
32
18 17
21
9
16 15
ATT
SPKR
25
OUT
LEFT FRONT
MUTE
SPKR
TREBLE
BASS
VOL
LOUD+
+
ZERO
CROSS
ATT
MUTE
23
OUT
LEFT REAR
MUTE
SCL
SDA
282726
SERIAL BUS DECODER + LATCHES
SOFT
MUTE
DIGGND
SPKR
ATT
24
OUT
RIGHT FRONT
MUTE
TREBLE
BASS
LOUD+
+
ZERO
CROSS
VOL
MUTE
ATT
SPKR
OUT
RIGHT REAR
22
D94AU104B
MUTE
C16
TREBLE(R)
C15
C14
BOUT(R) BIN(R)
20 19 1
CSMOUT(R)CREF IN(R)
CSM
C12
LOUD(R)
24
314
2.7nF
100nF
100nF
47nF
47nF
C10
4.7K
R1
2/14
INPUT
+ GAIN
SELECTOR
L1
L2
13
12
L1
L2
C1
LEFT
M
INPUTS
L3
11
L3
C2
C6
10
CD GND
CD
R3
M
8
5
M
R3
C3
C7
C8
MONO INPUT
R1
R2
SUPPLY
7
6
R1
R2
C5
C4
RIGHT
INPUTS
10µFC9
30 31 29
S
V
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
S
T
amb
T
stg
Operating Supply Voltage 10.5 V
Operating Ambient Temperature -40 to 85 °C
Storage Temperature Range -55 to 150 °C
PIN CONNECTION
S
TR L
V
TR R
IN R
OUT R
LOUD R
IN R3
IN R2
IN R1
MONO
GNDSMCREF
32 3031 29 28 27 26 25
1
2
3
4
5
6
7
8
910
11 12 13 14 15 16
SCL
SDA
DIG GND
OUT LF
24
OUT RF
23
OUT LR
22
OUT RR
21
BOUT R
20
BIN R
19
BOUT L
18
BIN L
17
TDA7342
IN L
IN L3
LOUD L
CD GND
CSM
IN L2
IN L1
D94AU105A
OUT L
THERMAL DATA
Symbol Parameter Value Unit
R
th j-amb
Thermal ResistanceJunction-pins 150 °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 Signalto Noise Ratio 106 dB
S
C
Supply Voltage 6 9 10.2 V
Max. input signal handling 2.1 2.6 Vrms
Channel Separation f = 1KHz 100 dB
Volume Control 0.3dB step -59.7 20 dB
Treble Control 2dB step -14 +14 dB
Bass Control 2dB step -10 +18 dB
Fader and Balance Control 1.25dBstep -38.75 0 dB
Input Gain 3.75dB step 0 11.25 dB
Mute Attenuation 100 dB
3/14
TDA7342
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
INPUTSELECTOR
G
G
G
R
V
S
R
I MIN
I MAX
step
e
V
CL
L
N
DC
Input Resistance 70 100 130 KΩ
I
Clipping Level d ≤ 0.3% 2.1 2.6 V
Input Separation 80 100 dB
I
Output Load Resistance 2 KΩ
Minimum InputGain -0.75 0 0.75 dB
Maximum Input Gain 10.25 11.25 12.25 dB
Step Resolution 2.75 3.75 4.75 dB
Input Noise 20Hz to 20 KHz unweighted 2.3
DC Steps Adiacent Gain Steps 1.5 10 mV
to G
G
IIN
IMAX
3mV
DIFFERENTIAL INPUT ( IN 3)
R
CMRR Common Mode Rejection Ratio V
d Distortion V
e
IN
DIFF Differential Gain D6 = 0 -1 0 1 dB
G
Input Resistance Input selector BIT D6 = 0 (0dB) 10 15 20 K
I
Input selector BIT D6 = 1(-6dB) 14 20 30 K
CM
=1V
; f =1KHz 48 75 dB
RMS
f = 10KHz 45 70 dB
=1V
I
RMS
0.01 0.08 %
Input Noise 20Hz to 20KHz; Flat; D6 = 0 5 µV
D6 = 1 -7 -6 -5 dB
RMS
V
µ
Ω
Ω
VOLUMECONTROL
R
G
MAX
A
MAX
A
STEPC
A
STEPF
E
A
E
V
DC
Input Resistance 35 50 KΩ
I
Maximum Gain 18.75 20 21.25 dB
Maximum Attenuation 57.7 59.7 62.7 dB
Step Resolution Coarse Atten. 0.5 1.25 2.0 dB
StepResolution FineAttenuation 0.11 0.31 0.51 dB
Attenuation Set Error G = 20 to -20dB -1.25 0 1.25 dB
Tracking Error 2dB
t
DC Steps Adiacent Attenuation Steps -3 0 3 mV
LOUDNESS CONTROL
R
A
MAX
A
step
Internal Resistor Loud = On 35 50 65 K
I
Maximum Attenuation 17.5 18.75 20.0 dB
Step Resolution 0.5 1.25 2.0 dB
G = -20 to -58dB -3 2 dB
From 0dB to A
MAX
0.5 5 mV
Ω
4/14
TDA7342
ELECTRICALCHARACTERISTICS (continued.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
ZEROCROSSINGMUTE
V
TH
A
MUTE
V
DC
SOFTMUTE
A
MUTE
T
DON
T
DOFF
V
THSM
R
INT
V
SMH
V
SML
BASS CONTROL
B
BOOST
B
CUT
A
step
R
g
TREBLECONTROL
C
RANGE
A
step
SPEAKERATTENUATORS
C
RANGE
A
step
A
MUTE
E
A
V
DC
AUDIO OUTPUT
V
clip
R
L
R
O
V
DC
Zero Crossing Threshold
(note 1)
WIN = 11 20 mV
WIN = 10 40 mV
WIN = 01 80 mV
WIN = 00 160 mV
Mute Attenuation 80 100 dB
DC Step 0dBto Mute 0 3 mV
Mute Attenuation 45 60 dB
ON Delay Time C
=22nF;0 to-20dB; I =I
CSM
CSM =22nF; 0 to -20dB; I = IMIN 20 35 55 ms
C
0.7 1 1.7 ms
MAX
OFF Current VCSM = 0V;I = IMAX 25 50 75 µA
CSM =0V; I = IMIN 1 µA
V
Soft MuteThreshold 1.5 2.5 3.5 V
Pullup Resistor (pin 21) (note 2) 35 50 65 K
(pin 21) Level High 3.5 V
(pin 21) Level Low Soft Mute Active 1 V
Max Bass Boost 15 18 20 dB
Max Bass Cut -8.5 -10 -11.5 dB
Step Resolution 1 2 3 dB
Internal Feedback Resistance 45 65 85 KΩ
Control Range
13
±
14
±
15 dB
±
Step Resolution 1 2 3 dB
Control Range 35 37.5 40 dB
Step Resolution 0.5 1.25 2.00 dB
Output Mute Attenuation Data Word = XXX11111 80 100 dB
Attenuation Set Error 1.25 dB
DC Steps Adjacent Attenuation Steps 0 3 mV
Clipping Level d = 0.3% 2.1 2.6 Vrms
Output Load Resistance 2 K
Output Impedance 30 100 Ω
DC Voltage Level 3.5 3.8 4.1 V
Ω
Ω
5/14
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