SC7314
4-CH OUTPUT STEREO AUDIO PROCESSOR WITH 4 STEREO INPUTS AND
TONE/VOLUME CONTROL
DESCRIPTION
The SC7314 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. 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.
FEATURES
* Input multiplexer:
--4 stereo inputs
--Selectable input gain for optimal adaptation to different
sources
* Four speaker attenuators:
--4 independent speakers control in 1.25dB steps for
balance and fader facilities
--Independent mute function
* All functions programmable via serial I C Bus
* Loudness function
* Volume control in 1.25dB steps
* Treble and bass control
* Input and output for external equalizer or noise reduction system
2
ORDERING INFORMATION
Device
SC7314
SC7314S
SC7314D
Package
DIP-28-600-2.54
SOP-28-375-1.27
SDIP-28-400-1.778
BLOCK DIAGRAM
18
6
17
12
20
19
3
24
L
16 L1
L2
15
L3
14
L4
13
R1
8
R2
9
10
11
28
R3
R4
C
REF
Volume &
Loudness
Bass
Treble
Speaker
ATT/Mute
Volume &
Loudness
Input
Selection
&
Gain
Control
Speaker
ATT/Mute
SCL
Bass
Treble
27
Serial Bus Decoder + Latches
SDA
26
DGND
25
Supply
R
1
2
5
7
22
21
4
23
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1
2007.09.25
Page 1 of 14
SC7314
ABSOLUTE MAXIMUM RATINGS
Characteristics
Supply Voltage
Operating Temperature
Storage Temperature
Symbol
V
S
T
amb
T
stg
Ratings
10.5
-20 ~ +75
-40 ~ +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
S/N
Sc
-78.75
-14
-38.75
0
100
106
103
0
+14
0
11.25
dB
dB
dB
dB
dB
dB
dB
Symbol
V
s
V
CL
THD
Min.
6
2
0.01
0.1
Typ.
9
Max.
10
Unit
V
Vrms
%
ELECTRICAL CHARACTERISTICS (Refer to the test circuit)
(T
amb
=25°C,V
S
=9.0V,R
L
=10kΩ R
G
=600Ω all controls flat(G=0), f=1kHz,Unless otherwise specified)
Characteristics
SUPPLY VOLTAGE
Operating Supply Voltage
Operating Supply Current
Ripple Rejection Of Supply
Voltage
INPUTS SELECTORS
Input Resistance
Clipping Level
Input Separation (note 2)
Output Load Resistance
Minimum Input Gain
Maximum Input Gain
Step Resolution
Input Noise
DC Steps
R
II
V
CL
S
IN
R
L
G
IN(MIN)
G
IN(MAX)
G
STEP
e
IN
V
DC
G=11.25dB
Adjacent gain steps
G=18.75 to MUTE
Pin 6,18
Input 1, 2, 3, 4
35
2
80
4
-1
0
11.25
3.75
2
4
4
20
1
50
2.5
100
70
kΩ
Vrms
dB
kΩ
dB
dB
dB
µV
mV
mV
(To be continued)
Symbol
V
S
I
S
SV
R
Test conditions
Min.
6
Typ.
9
20.0
Max.
10.0
35.0
Unit
V
mA
dB
60
80
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1
2007.09.25
Page 2 of 14
SC7314
(Continued)
Characteristics
VOLUME CONTROL
Input Resistance
Control Range
Minimum Attenuation
Maximum Attenuation
Step Resolution
Attenuation Set Error
Tracking Error
DC Steps
SPEAKER ATTENUATORS
Control Range
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
R
IV
C
range
A
V(min)
A
V(max)
ASTEP
EA
ET
V
DC
Test conditions
Min.
20
70
-1
70
0.5
Typ.
33
75
0
75
1.25
0
Max.
50
80
1
80
1.75
1.25
2
2
Unit
kΩ
dB
dB
dB
dB
dB
dB
mV
mV
A
V
=0 to –
20dB
A
V
=-20 to –60dB
-1.25
-3
Adjacent attenuation steps
From 0dB to AV max
0
0.5
3
7.5
C
range
SSTEP
EA
AMUTE
V
DC
Adjacent attenuation steps
From 0dB to MUTE
35
0.5
37.5
1.25
40
1.75
1.5
dB
dB
dB
dB
80
100
0
1
3
10
±16
3
58
mV
mV
GB
BSTEP
RB
Maximum boost/cut
±12
1
34
±14
2
44
dB
dB
kΩ
Gt
T
STEP
Maximum boost/cut
±13
1
±14
2
±15
3
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
(To be continued)
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
S/N
All gains=0dB; Vo=1V
rms
2.5
5
3
106
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1
2007.09.25
Page 3 of 14
SC7314
(Continued)
Characteristics
Symbol
Test conditions
A
V
=0,V
IN
=10mV
A
V
=-20dB, V
IN
=1V
rms
A
V
=-20dB,V
IN
=0.3V
rms
Min.
Typ.
0.01
0.09
0.04
Max.
0.1
0.3
Unit
%
%
%
dB
Distortion
d
Channel Separation
Left/Right
Total Tracking Error
BUS INPUTS
Input Low Voltage
Input High Voltage
Input Current
Output Voltage SDA
Acknowledge
NOTES:
S
c
A
V
=0 to – dB
20
A
V
=-20 to –60 dB
80
103
0
0
1
2
dB
dB
V
IL
V
IH
I
IN
V
o
I
o
=1.6mA
3
-5
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 selected input is grounded through the 2.2µF capacitor.
PIN CONFIGURATIONS
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
REV:1.1
2007.09.25
Page 4 of 14
SC7314
TYPICAL CHARACTERISTICS PERFORMANCE
Loudness (dB)
Loudness (dB)
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
Channel Separation (dB)
THD & Noise (%)
THD (%)
THD & Noise (%)
Noise (¦ÌV£©
Noise (¦ÌV£©
Loudness (dB)
REV:1.1
2007.09.25
Page 5 of 14
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