SC7315
2-CH OUTPUT STEREO AUDIO PROCESSOR
DESCRIPTION
The SC7315 is a volume, tone (bass and treble), balance (left/ right)
and fader processor for quality audio applications in car radio and Hi-Fi
systems. Selectable input gain and external loudness function are
provided. Control is accomplished by serial I
2
C bus microprocessor
interface. The AC signal settings is obtained by resistor networks and
switches combined with operational amplifiers. Due to the Used CMOS
technology, low distortion, low noise and low DC stepping are obtained.
DIP-20-300-2.54
FEATURES
* 2 stereo inputs
* Two speaker attenuators:
--2 independent speakers control in 1.25dB steps for balance and fader
facilities
--Independent mute function
* All functions programmable via serial I
2
C Bus
* Loudness function
* Volume control in 1.25dB steps
* Treble and bass control
* Input and output for external equalizer ornoise reduction system
Device
SC7315
SC7315S
SOP-20-375-1.27
ORDERING INFORMATION
Package
DIP-20-300-2.54
SOP-20-375-1.27
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2004.08.03
Page 1 of 13
SC7315
ABSOLUTE MAXIMUM RATING
Characteristics
Supply Voltage
Operating Temperature
Storage Temperature
Symbol
V
S
T
amb
T
stg
Ratings
10.2
-40 ~ +85
-55 ~ +150
Unit
V
°C
°C
QUICK REFERENCE DATA
Characteristics
Supply Voltage
Maximum Input Signal Handling
Total Harmonic Distortion ,V=1Vrms,
f=1kHz
Signal to Noise Ratio
Channel Separation, f=1kHz
Volume Control, 1.25dB Step
Bass and Treble Control, 2dB step
Fader and Balance Control, 1.25dB step
Input Gain, 3.75dB Step
Mute Attenuation
Symbol
V
s
V
CL
THD
S/N
SC
-78.75
-14
-38.75
0
100
Min.
6
2
0.01
106
103
0
+14
0
11.25
0.1
Typ.
9
Max.
10
Unit
V
V
rms
%
dB
dB
dB
dB
dB
dB
dB
ELECTRICAL CHARACTERISTICS (Refer to the test circuit)
(Tamb=25°C,VS=9.0V,RL=10kΩ
Characteristics
SUPPLY VOLTAGE
Operating Supply Voltage
Operating Supply Current
Ripple Rejection of Supply Voltage
VOLUME CONTROL
Input Resistance
Control Range
Minimum Attenuation
Maximum Attenuation
Step Resolution
Attenuation Set Error
Tracking Error
DC Steps
SPEAKER ATTENUATORS
Control Range
C
range
35
37.5
40
dB
R
IV
C
range
A
V(min)
AV(max)
ASTEP
RG=600Ω
Symbol
all controls flat(G=0), f=1kHz,Unless otherwise specified)
Test conditions
Min.
Typ.
Max.
Unit
V
S
I
S
S
VR
6
9
20.0
10.0
35.0
V
mA
dB
60
80
20
70
-1
70
0.5
A
V
=0 to –
20dB
A
V
=-20 to –60dB
-1.25
-3
33
75
0
75
1.25
0
50
80
1
80
1.75
1.25
2
2
kΩ
dB
dB
dB
dB
dB
dB
mV
mV
EA
ET
V
DC
Adjacent attenuation steps
From 0dB to AV max
0
0.5
3
7.5
(To be continued)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2004.08.03
Page 2 of 13
SC7315
(Continued)
Characteristics
Step Resolution
Attenuation Set Error
Output Mute Attenuation
DC Steps
BASS CONTROL (note 1)
Control Range
Step Resolution
Internal Feedback Resistance
TREBLE CONTROL (note 1)
Control Range
Step Resolution
AUDIO OUTPUTS
Clipping Level
Output Load Resistance
Output Load Capacitance
Output Resistance
DC Voltage Level
GENERAL
Symbol
S
STEP
EA
A
MUTE
V
DC
Test conditions
Min.
0.5
Typ.
1.25
Max.
1.75
1.5
Unit
dB
dB
dB
80
Adjacent attenuation steps
From 0dB to MUTE
±12
1
34
±13
1
100
0
1
±14
2
44
±14
2
3
10
±16
3
58
±15
3
mV
mV
GB
B
STEP
RB
Maximum boost/cut
dB
dB
kΩ
Gt
TSTEP
Maximum boost/cut
dB
dB
V
OCL
R
L
C
L
R
OUT
V
OUT
THD=0.3%
2
4
2.5
Vrms
kΩ
10
nF
Ω
V
µV
15
µV
µV
dB
0.1
0.3
%
%
%
dB
1
2
dB
dB
30
4.2
75
4.5
120
4.8
BW=20 ~20kHz,flat output muted
Output Noise
e
NO
BW=20 ~20kHz,flat All gains=0dB
A curve, all gains =0 dB
Signal to Noise Ratio
Distortion
S/N
d
All gains=0dB; Vo=1V
rms
A
v
=0,V
IN
=10mV
A
v
=-20dB, V
IN
=1V
rms
A
v
=-20dB,V
IN
=0.3V
rms
Channel Separation Left/Right
Total Tracking Error
BUS INPUTS
Input Low Voltage
Input High Voltage
Input Current
Output Voltage SDA Acknowledge
NOTES:
V
IL
V
IH
I
IN
V
o
I
o
=1.6mA
3
-5
S
c
A
V
=0 to – dB
20
A
V
=-20 to –60 dB
80
2.5
5
3
106
0.01
0.09
0.04
103
0
0
1
V
V
µA
V
+5
0.4
(1) Bass and treble response see Figure 16. The center frequency and quality of the response behavior can be
chosen by the external circuitry. A standard first order bass response can realized by a standard feedback
network.
(2) The input is grounded through the 2.2µF capacitor.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2004.08.03
Page 3 of 13
SC7315
PIN CONFIGURATIONS
C
REF
V
DD
GND
L
TREBLE
R
IN(R)
LOUD R
NC
LOUD L
5
6
7
8
9
16 OUT R
15 BOUT(R)
14 BIN(R)
BASS
13 BOUT(L)
12 BIN(L)
11 IN(L)
1
2
3
4
20 SCL
19 SDA
18 DGND
17 OUT L
BUS
INPUTS
NC 10
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2004.08.03
Page 4 of 13
SC7315
TYPICAL CHARACTERISTICS PERFORMANCE
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.0
2004.08.03
Page 5 of 13
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