SGS Thomson Microelectronics TDA7312 Datasheet
DIGITAL CONTROLLED STEREO AUDIO PROCESSOR
INPUTMULTIPLEXER:
- 4 STEREO INPUTS
FOURSELECTABLEADDRESSES
TWODIGITAL CONTROL OUTPUTS
INPUT AND OUTPUT FOR EXTERNAL
EQUALIZER OR NOISE REDUCTION SYSTEM
VOLUMECONTROL IN 1.25dB STEPS
TREBLEAND BASSCONTROL
TWOSPEAKER ATTENUATORS:
- INDEPENDENTSPEAKERS CONTROL
IN 1.25dB STEPS
- INDEPENDENTMUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
2
RIAL I
DESCRIPTION
The TDA7312 is a volume, tone (bass and treble)
balance(Left/Right)processorforqualityaudioapplications.
C BUS
TDA7312
SDIP30
ORDERING NUMBER: TDA7312
Controlis accomplis hedby serialI
essorinterface.
TheAC si gnalsetti ngisobtain edbyresistornetwork s
andswitchescombinedwithoperationalamplifiers.
Thanks to the used BIPOLAR/CMOS Te cnology,
LowDistortion,Low Noise andLow DC steppingare
obtained.
2
C bus microproc-
PIN CONNECTION (Topview)
November 1999
1/13
TDA7312
TEST CIRCUIT
THERMAL DATA
Symbol Description SDIP30 Unit
R
thj-pins
Thermal Resistance Junction-pins max 85 °C/W
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
T
amb
T
stg
Operating Supply Voltage 10.2 V
S
Operating Ambient Temperature 0 to 70
Storage Temperature Range -40 to 150 °C
QUICK REFERENCE DATA
Symbol Parameter Min. Typ. Max. Unit
V
V
CL
THD Total Harmonic DistortionV = 1Vrms f = 1KHz 0.01 0.1 %
S/N Signal to Noise Ratio 106 dB
S
Supply Voltage 6 9 10 V
S
Max. input signal handling 2 Vrms
Channel Separation f = 1KHz 103 dB
C
Volume Control 1.25dB step -78.75 0 dB
Bass and TrebleControl 2db step -14 +14 dB
Fader and Balance Control 1.25dBstep -38.75 0 dB
Mute Attenuation 100 dB
C
°
2/13
BLOCK DIAGRAM
TDA7312
3/13
TDA7312
ELECTRICALCHARACTERISTICS (refer to the test circuitT
R
= 600Ω, all controlsflat (G = 0), f =1KHz unless otherwise specified)
G
=25°C, VS= 9V,RL=10KΩ,
amb
Symbol Parameter Test Condition Min. Typ. Max. Unit
SUPPLY
V
S
I
S
SVR Ripple Rejection 60 80 dB
Supply Voltage 6 9 10 V
Supply Current 8 11 mA
INPUT SELECTORS
R
II
V
CL
S
IN
R
L
e
IN
Input Resistance Input 1, 2, 3 35 50 70 K
Clipping Level 2 2.5 Vrms
Input Separation (2) 80 100 dB
Output Load resistance 2 K
Input Noise 2
VOLUMECONTROL
R
IV
C
RANGE
A
VMIN
A
VMAX
A
STEP
E
A
E
T
V
DC
Input Resistance 20 33 50 kΩ
Control Range 70 75 80 dB
Min. Attenuation -1 0 1 dB
Max. Attenuation 70 75 80 dB
Step Resolution 0.5 1.25 1.75 dB
Attenuation Set Error Av = 0 to -20dB
Av = -20 to -60dB
-1.25
-3
0 1.25
2
Tracking Error 2dB
DC Steps adjacent attenuation steps
From 0dB to Av max
0
0.5
3
7.5
SPEAKERATTENUATORS
µ
dB
dB
mV
mV
Ω
Ω
V
C
S
A
range
STEP
E
MUTE
V
DC
A
Control Range 35 37.5 40 dB
Step Resolution 0.5 1.25 1.75 dB
Attenuation set error 1.5 dB
Output Mute Attenuation 80 100 dB
DC Steps adjacent att. steps
from 0 to mute
0
1
BASS CONTROL(1)
Gb Control Range Max. Boost/cut +12 +14 +16 dB
B
STEP
R
B
Step Resolution 1 2 3 dB
Internal Feedback Resistance 34 44 58 K
TREBLECONTROL(1)
Gt Control Range Max. Boost/cut +13 +14 +15 dB
T
STEP
Step Resolution 1 2 3 dB
DIGITALOUTPUTS
V
CESAT
I
leak
I leakage V
V
= Low IC=1mA 0.2 0.3 V
OUT
OUT=VS
3
10
mV
mV
10 µA
Ω
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