TDA7318, Elektronika, elementy
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TDA7318
DIGITAL CONTROLLED STEREO AUDIO PROCESSOR
ADVANCE DATA
INPUT MULTIPLEXER:
- 4 STEREO INPUTS
- SELECTABLE INPUT GAIN FOR OPTIMAL
ADAPTION TO DIFFERENT SOURCES
INPUT AND OUTPUT FOR EXTERNAL
EQUALIZER OR NOISE REDUCTION SYS-
TEM
VOLUME CONTROL IN 1.25dB STEPS
TREBLE AND BASS CONTROL
FOUR SPEAKER ATTENUATORS:
- 4 INDEPENDENT SPEAKERS CONTROL
IN 1.25dB STEPS FOR BALANCE AND
FADER FACILITIES
- INDEPENDENT MUTE FUNCTION
ALL FUNCTIONS PROGRAMMABLE VIA SE-
RIAL I
2
CBUS
DIP28
SO28
ORDERING NUMBERS:
TDA7318
TDA7318D
Selectable input gain is provided. Control is accom-
plished by serial I
2
C bus microprocessor interface.
The AC signal setting is obtained by resistor networks
and switches combined with operational amplifiers.
Thanks to the used BIPOLAR/CMOS Tecnology,
Low Distortion, Low Noise and Low DC stepping are
obtained.
DESCRIPTION
The TDA7318 is a volume, tone (bass and treble)
balance (Left/Right) and fader (front/rear) processor
for quality audio applications in car radio and Hi-Fi
systems.
PIN CONNECTION
(Top view)
May 1991
1/14
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
TDA7318
TEST CIRCUIT
THERMAL DATA
Symbol
Description
SO28
DIP28
Unit
R
th j-pins
Thermal Resistance Junction-pins
max
85
65
°
C/W
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
S
Operating Supply Voltage
10.2
V
T
amb
Operating Ambient Temperature
-40 to 85
°
C
T
stg
Storage Temperature Range
-55 to +150
°
C
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
Fader and Balance Control
1.25dB step
-38.75
0
dB
Input Gain
6.25dB step
0
18.75
dB
Mute Attenuation
100
dB
2/14
TDA7318
BLOCK DIAGRAM
3/14
TDA7318
ELECTRICAL CHARACTERISTICS
(refer to the test circuit T
amb
=25
°
C, V
S
= 9V, R
L
= 10K
W
,
R
G
= 600
W
, 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
4
8
11
mA
SVR
Ripple Rejection
60
85
dB
INPUT SELECTORS
R
II
Input Resistance
Input 1, 2, 3, 4
35
50
70
K
W
V
CL
Clipping Level
2
2.5
Vrms
S
IN
Input Separation (2)
80
100
dB
R
L
Output Load resistance
pin 7, 17
2
K
W
G
INmin
Min. Input Gain
-1
0
1
dB
G
INmax
Max. Input Gain
17
18.75
20
dB
G
STEP
Step Resolution
5
6.25
7.5
dB
e
IN
Input Noise
G = 18.75dB
2
m
V
V
DC
DC Steps
adjacent gain steps
4
20
mV
G = 18.75 to Mute
4
mV
VOLUME CONTROL
R
IV
Input Resistance
20
33
50
k
W
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
W
TREBLE CONTROL (1)
Gt
Control Range
Max. Boost/cut
+13
+14
+15
dB
T
STEP
Step Resolution
1
2
3
dB
4/14
TDA7318
ELECTRICAL CHARACTERISTICS
(continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
AUDIO OUTPUTS
V
OCL
Clipping Level
d = 0.3%
2
2.5
Vrms
R
L
Output Load Resistance
2
K
W
C
L
Output Load Capacitance
10
nF
R
OUT
Output resistance
30
75
120
W
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
m
V
15
m
V
A curve
all gains = 0dB
3
m
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
m
A
V
O
Output Voltage SDA
Acknowledge
I
O
= 1.6mA
0.4
V
Notes:
(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
(2) The selected input is grounded thru the 2.2
m
F capacitor.
Figure 1:
Noise vs. Volume/Gain Settings
Figure 2:
Signal to Noise Ratio vs. Volume
Setting
5/14
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