TDA7315
DIGITAL CONTROLLED AUDIO PROCESSOR
1 STEREO INPUT
LOUDNESS FUNCTION
VOLUME CONTROL IN 1.25dB STEPS
TREBLE AND BASS CONTROL
TWO SPEAKERS ATTENUATORS:
- INDEPENDENT SPEAKERS CONTROL
IN 1.25dB STEPS
- INDEPENDENT MUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
RIAL BUS
DESCRIPTION
The TDA7315 is a volume, tone (bass and treble)
balance (Left/Right) processor for quality audio appli-
cations in car radio and Hi-Fi systems.
Control is accomplished by serial bus microprocessor
interface.
The AC signal settingis obtainedby resistor networks
and switches combined with operational amplifi-
ers.
Thanks to the used BIPOLAR/CMOS Technology,
Low Distortion, Low Noise and DC stepping are ob-
tained.
July 1998
ORDERING NUMBER: TDA7315 (DIP 20)
TDA7315D (SO 20)
BLOCK DIAGRAM
SO20
DIP 20
1/12
THERMAL DATA
Symbol
Parameter
SO 20
DIP 20
Unit
R
th j-pins
Thermal Resistance Junction-pins
Max.
150
150
C/W
QUICK REFERENCE DATA
Symbol
Parameter
Min.
Typ.
Max.
Unit
V
S
Supply Voltage
6
9
10
V
V
CL
Max. input signal handling
2
Vrms
THD
Total Harmonic Distortion V = 1Vrms f = 1KHz
0.01
0.1
%
S/N
Signal to Noise Ratio
106
dB
S
C
Channel Separation f = 1KHz
103
dB
Volume Control
1.25dB step
-78.75
0
dB
Bass and Treble Control
2db step
-14
+14
dB
Balance Control
1.25dB step
-38.75
0
dB
Mute Attenuation
100
dB
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Operating Supply Voltage
10.2
V
T
amb
Operating Ambient Temperature
-10 to 85
C
T
stg
Storage Temperature Range
-55 to +150
C
PIN CONNECTION (Top view)
TDA7315
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ELECTRICAL CHARACTERISTICS (refer to the test circuit T
amb
= 25
C, V
S
= 9V, R
L
= 10K
, R
G
=
600
, all controls flat (G = 0), f = 1KHz unless otherwise specified)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
SUPPLY
V
S
Supply Voltage
6
9
10
V
I
S
Supply Current
8
11
mA
SVR
Ripple Rejection
60
80
dB
VOLUME CONTROL
R
IV
Input Resistance
20
33
50
k
C
RANGE
Control Range
70
75
80
dB
A
VMIN
Min. Attenuation
-1
0
1
dB
A
VMAX
Max. Attenuation
70
75
80
dB
A
STEP
Step Resolution
0.5
1.25
1.75
dB
E
A
Attenuation Set Error
Av = 0 to -20dB
Av = -20 to -60dB
-1.25
-3
0
1.25
2
dB
dB
E
T
Tracking Error
2
dB
V
DC
DC Steps
adjacent attenuation steps
From 0dB to Av max
0
0.5
3
7.5
mV
mV
SPEAKER ATTENUATORS
C
range
Control Range
35
37.5
40
dB
S
STEP
Step Resolution
0.5
1.25
1.75
dB
E
A
Attenuation set error
1.5
dB
A
MUTE
Output Mute Attenuation
80
100
dB
V
DC
DC Steps
adjacent att. steps
from 0 to mute
0
1
3
10
mV
mV
BASS CONTROL (1)
Gb
Control Range
Max. Boost/cut
+12
+14
+16
dB
B
STEP
Step Resolution
1
2
3
dB
R
B
Internal Feedback Resistance
34
44
58
K
TEST CIRCUIT
TDA7315
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ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
TREBLE CONTROL (1)
Gt
Control Range
Max. Boost/cut
+13
+14
+15
dB
T
STEP
Step Resolution
1
2
3
dB
AUDIO OUTPUTS
V
OCL
Clipping Level
d = 0.3%
2
2.5
Vrms
R
L
Output Load Resistance
2
K
C
L
Output Load Capacitance
10
nF
R
OUT
Output resistance
30
75
120
V
OUT
DC Voltage Level
4.2
4.5
4.8
V
GENERAL
e
NO
Output Noise
BW = 20-20KHz, flat
output muted
all gains = 0dB
2.5
5
15
V
V
A curve all gains = 0dB
3
V
S/N
Signal to Noise Ratio
all gains = 0dB; V
O
= 1Vrms
106
dB
d
Distortion
A
V
= 0, V
IN
= 1Vrms
A
V
= -20dB V
IN
= 1Vrms
V
IN
= 0.3Vrms
0.01
0.09
0.04
0.1
0.3
%
%
%
Sc
Channel Separation left/right
80
103
dB
Total Tracking error
A
V
= 0 to -20dB
-20 to -60 dB
0
0
1
2
dB
dB
BUS INPUTS
V
IL
Input Low Voltage
1
V
V
IH
Input High Voltage
3
V
I
IN
Input Current
-5
+5
A
V
O
Output Voltage SDA
Acknowledge
I
O
= 1.6mA
0.4
V
Note:
(1) Bass and Treble response see attached diagram (fig.19). The center frequency and quality of the resonance behaviour can be choosen by
the external circuitry. A standard first order bass response can be realized by a standard feedback network.
Figure 1: Loudness versus Volume Attenuation
Figure 2: Loudnessversus Frequency
TDA7315
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Figure 6: Distortion & Noise vs. Frequency
Figure 7: Distortion & Noise vs. Frequency
Figure 8: Distortion vs. Load Resistance
Figure 4: Noise vs. Volume/Gain Settings
Figure 5: Signal to Noise Ratio vs. Volume
Setting
Figure 3: Loudness versus External Capacitors
LOUDNESS
V
S
= 9V
Volume = -40dB
All other control flat
C
in
= 2.2
F
C
loud
= 220nF, 100nF, 33nF, 10nF, Open, Shorter to Vref
TDA7315
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