SGS Thomson Microelectronics TDA7318D, TDA7318 Datasheet
DIGITAL CONTROLLED STEREO AUDIO PROCESSOR
INPUTMULTIPLEXER:
- 4 STEREO INPUTS
- SELECTABLEINPUT GAIN FOR OPTIMAL
ADAPTIONTO DIFFERENTSOURCES
INPUT AND OUTPUT FOR EXTERNAL
EQUALIZER OR NOISE REDUCTION SYSTEM
VOLUMECONTROL IN 1.25dBSTEPS
TREBLEAND BASS CONTROL
FOURSPEAKERATTENUATORS:
- 4 INDEPENDENTSPEAKERSCONTROL
IN 1.25dB STEPS FOR BALANCEAND
FADERFACILITIES
- INDEPENDENTMUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIASE-
2
RIALI
CBUS
DESCRIPTION
The TDA7318 is a volum e, tone (bass and treble)
balance (Left/Ri ght) and fader (front/rear) processor
for quality audio applications in car radio and Hi-Fi
systems.
TDA7318
DIP28 SO28
ORDERING NUMBERS:
TDA7318 TDA7318D
Selectabl e input gain is provided. Control is ac co mplishedbyserialI
TheACsignalsettingisobtainedbyresistornetwo rks
andswitchescombinedwithoperationalamplifiers.
Thanks to the used BIP OLAR / C MOS Tec nol ogy ,
LowDistortion, LowNoiseandLow DC steppingare
obtained.
2
Cbusmicroprocessorinterface.
PIN CONNECTION (Topview)
November 1999
1/14
TDA7318
TEST CIRCUIT
THERMAL DATA
Symbol Description SO28 DIP28 Unit
R
thj-pins
Thermal Resistance Junction-pins max 85 65 °C/W
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
T
amb
T
stg
Operating Supply Voltage 10.2 V
S
Operating Ambient Temperature -40 to 85
Storage Temperature Range -55 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
Input Gain 6.25dB step 0 18.75 dB
Mute Attenuation 100 dB
C
°
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BLOCK DIAGRAM
TDA7318
BUS
C17
5.6K R2
2.7nF
C15
100nF
C14
100nF
ATT
SPKR
TREBLE(L)
4
BIN(L)
18
19
BOUT(L)
OUT
LEFT FRONT
25
RB
MUTE
ATT
SPKR
TREBLE
BASS
VOL
OUT
LEFT REAR
23
MUTE
SCL
SDA
282726
C BUS DECODER + LATCHES
2
I
DIGGND
ATT
SPKR
VOL BASS TREBLE
OUT
RIGHT FRONT
24
MUTE
ATT
SPKR
OUT
22
RB
RIGHT REAR
MUTE
TREBLE(R)
5
21 20
BOUT(R) BIN(R)
D95AU265
C13
100nF
C12
100nF
C16
2.7nF
5.6K R1
C11 2.2µF
17 16
OUT(L) IN(L)
INPUT
+ GAIN
SELECTOR
L1 15L1L2 14L2L3 13L3L4 12
4x
2.2µF
C1
C2
C3
LEFT
INPUTS
C4
L4
R4 8R4R3 9R3R2 10
C5
C6
R2
C7
RIGHT
INPUTS
11 R1
R1
C8
4x
2.2µF
SUPPLY
76
OUT(R) IN(R)
AGND CREF
V
231
C10 2.2µF
22µFC9
CC
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TDA7318
ELECTRICALCHARACTERISTICS (refer tothe test circuit T
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 85 dB
Supply Voltage 6 9 10 V
Supply Current 4 8 11 mA
INPUT SELECTORS
G
G
G
V
R
II
V
CL
S
IN
R
L
INmin
INmax
STEP
e
IN
DC
Input Resistance Input 1, 2, 3, 4 35 50 70 K
Clipping Level 2 2.5 Vrms
Input Separation (2) 80 100 dB
Output Load resistance pin 7, 17 2 K
Min. Input Gain -1 0 1 dB
Max. Input Gain 17 18.75 20 dB
Step Resolution 5 6.25 7.5 dB
Input Noise G = 18.75dB 2
DC Steps adjacent gain steps 4 20 mV
G = 18.75 to Mute 4 mV
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 KΩ
TREBLECONTROL(1)
Gt Control Range Max. Boost/cut +13 +14 +15 dB
Step Resolution 1 2 3 dB
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T
STEP
10
3
mV
mV
TDA7318
ELECTRICALCHARACTERISTICS (continued)
Symbol Parameter Test Condition Min. Typ. Max. Unit
AUDIO OUTPUTS
V
OCL
R
L
C
L
R
OUT
V
OUT
Clipping Level d = 0.3% 2 2.5 Vrms
Output Load Resistance 2 KΩ
Output Load Capacitance 10 nF
Output resistance 30 75 120
Ω
DC Voltage Level 4.2 4.5 4.8 V
GENERAL
e
NO
S/N Signal to Noise Ratio all gains = 0dB; V
d Distortion A
Sc Channel Separation left/right 80 103 dB
Output Noise BW = 20-20KHz, flat
output muted
all gains = 0dB
A curve all gains = 0dB 3 µV
O
=0,VIN= 1Vrms
V
A
= -20dB VIN= 1Vrms
Total Tracking error A
V
= 0 to -20dB
V
V
= 0.3Vrms
IN
-20 to -60 dB
2.5
515
µV
µ
= 1Vrms 106 dB
0.01
0.09
0.04
0
0
0.1
0.3
1
2
%
%
%
dB
dB
V
BUS INPUTS
V
IL
V
IH
I
IN
V
O
Notes:
(1) Bass and Trebleresponse seeattached diagram(fig.19). The center frequencyand quality ofthe resonance behaviour can be choosen by
the external circuitry. A standard first order bass response can be realized by a standard feedback network
(2) The selected input is groundedthru the 2.2µF capacitor.
Input Low Voltage 1V
Input High Voltage 3 V
Input Current -5 +5
Output Voltage SDA
IO= 1.6mA 0.4 V
A
µ
Acknowledge
Figure 1: Noisevs. Volume/GainSettings
Figure2: Signalto Noise Ratio vs. Volume
Setting
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