tda7318, elektronika, karty katalogowe i schematy
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TDA7318
DIGITAL CONTROLLED STEREO AUDIO PROCESSOR
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
andswitches combined with operationalamplifiers.
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)
November 1999
1/14
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
5.6K
R2
C17
2.7nF
C11 2.2
m
F
100nF
C14
100nF
C15
OUT(L)
IN(L)
BOUT(L)
BIN(L)
TREBLE(L)
17
16
19
18
4
SPKR
ATT
4x
2.2
m
F
RB
25
OUT
LEFT FRONT
C1
L1 15
L1
MUTE
C2
L2 14
L2
LEFT
INPUTS
C3
L3 13
L3
VOL
BASS
TREBLE
SPKR
ATT
23
OUT
LEFT REAR
C4
L4 12
L4
MUTE
INPUT
SELECTOR
+ GAIN
I
2
C BUS DECODER + LATCHES
28
27
26
SCL
SDA
DIGGND
BUS
C5
R4 8
R4
C6
R3 9
R3
VOL
BASS
TREBLE
SPKR
ATT
RIGHT
INPUTS
24
OUT
RIGHT FRONT
C7
R2 10
R2
C8
R1
11
R1
MUTE
4x
2.2
m
F
SPKR
ATT
RB
22
OUT
RIGHT REAR
SUPPLY
MUTE
2
3
1
7
6
21
20
5
V
CC
AGND
CREF
OUT(R) IN(R)
BOUT(R)
BIN(R)
TREBLE(R)
D95AU265
C9
22
F
100nF
C12
100nF
C13
C10 2.2
m
F
5.6K
R1
2.7nF
C16
m
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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