Silan
Semiconductors
SC7313
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1
2002.02.26
1
DIGITAL CONTROLLED STEREO
AUDIO PROCESSOR WITH LOUDNESS
DESCRIPTION
The SC7313 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 BIPOLAR/CMOS technology, low
distortion, low noise and low DC stepping are obtained.
FEATURES
* Input multiplexer:
--3 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
2
C Bus
DIP-28
SOP-28
ORDERING INFORMATION
Device Package
SC7313
DIP-28-600-2.54
SC7313S
SOP-28-375-1.27
* Loudness function
* Volume control in 1.25dB steps
* Treble and bass control
* Input and output for external equalizer or
noise reduction system
PIN CONFIGURATIONS
SC7313
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
C
REF
GND
V
DD
OUT(R)
R3
R2
R1
LOUD L
L3
L2
SCL
SDA
DIG GND
OUT LF
OUT RF
OUT LR
OUT RR
BOUT(R)
BIN(R)
BOUT(L)
BIN(L)
OUT(L)
IN(L)
L1
L
R
IN(R)
LOUD R
TREBLE
RIGHT
INPUTS
LEFT
INPUTS
)
LEFT INPUTS
BUS
INPUTS
BASS
Silan
Semiconductors
SC7313
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1
2002.02.26
2
BLOCK DIAGRAM
VOLUME
& LOUDNESS
BASS
TREBLE
VOLUME
& LOUDNESS
BASS
TREBLE
SERIAL BUS DECODER + LATCHES
15
14
13
9
10
11
17
16
12
19
18
4
7
6
8
21
20
5
28
27
26
23
25
24
22
SUPPLY
1
2
3
TREBLE
(L)
B-IN
(L)
B-OUT
(L)
LOUDNESS
(L)
IN
(L)
OUT
(L)
LEFT
INPUTS
RIGHT
INPUTS
TREBLE
(R)
B-IN
(R)
B-OUT
(R)
LOUDNESS
(R)
IN
(R)
OUT
(R)
CREF
VDD
A-GND
RIGHT
REAR
OUT
RIGHT
FRONT
OUT
DIG-GND
SDA
SCL
LEFT
REAR
OUT
LEFT
FRONT
OUT
BUS
MUTE
SPEAKER
ATT
MUTE
SPEAKER
ATT
MUTE
SPEAKER
ATT
MUTE
SPEAKER
ATT
INPUT SELECTION
& GAIN CONTROL
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Value
Unit
Supply Voltage
V
S
10.2
V
Operating Temperature
Tamb
-40 ~ +85
C
Storage Temperature
Tstg
-55 ~ +150
C
QUICK REFERENCE DATA
Characteristic Symbol
Min.
Typ.
Max.
Unit
Supply Voltage
Vs
6
9
10
V
Maximum input signal handling
V
CL
2
Vrms
Total harmonic distortion ,V=1Vrms, f=1kHz
THD
0.01
0.1
%
Signal to noise ratio
S/N
106
dB
Channel separation, f=1kHz
Sc
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, 3.75dB step
0
11.25
dB
Mute attenuation
100
dB
Silan
Semiconductors
SC7313
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1
2002.02.26
3
ELECTRICAL CHARACTERISTICS
(Refer to the test circuit)
(Tamb=25
C V
S
=9.0V,R
L
=10k
R
G
=600
all controls flat(G=0), f=1kHz,Unless otherwise specified)
Parameter Symbol
Test
conditions
Min
Typ
Max
Unit
SUPPLY VOLTAGE
Operating Supply Voltage
V
S
6
9
10.0
V
Operating Supply Current
I
S
20.0
35.0
mA
Ripple rejection of Supply Voltage
SVR
60
80
dB
INPUTS SELECTORS
Input resistance
R
II
Input 1,2,3
35
50
70
k
Clipping Level
V
CL
2
2.5
Vrms
Input Separation (note 2)
S
IN
80
100
dB
Output load resistance
R
L
Pin7,17
4
k
Minimum input Gain
G
IN(MIN)
-1
0
1
dB
Maximum input gain
G
IN(MAX)
11.25
dB
Step resolution
G
STEP
3.75
dB
Input noise
e
IN
G=11.25dB
2
V
Adjacent gain steps
4
20
mV
DC steps
V
DC
G=18.75 to MUTE
4
mV
VOLUME CONTROL
Input resistance
R
IV
20
33
50
k
Control range
Crange
70
75
80
dB
Minimum attenuation
A
V(min)
-1
0
1
dB
Maximum attenuation
A
V(max)
70
75
80
dB
Step resolution
A
STEP
0.5
1.25
1.75
dB
A
V
=0 to 20dB
-1.25
0
1.25
Attenuation set error
E
A
A
V
=-20 to 60dB
-3
2
dB
Tracking error
E
T
2
dB
Adjacent attenuation steps
0
3
mV
DC steps
V
DC
From 0dB to A
V
max
0.5
7.5
mV
SPEAKER ATTENUATORS
Control Range
Crange
35
37.5
40
dB
Step resolution
S
STEP
0.5
1.25
1.75
dB
Attenuation Set error
E
A
1.5
dB
Output Mute Attenuation
A
MUTE
80
100
dB
Adjacent attenuation steps
0
3
mV
DC steps
V
DC
From 0dB to MUTE
1
10
mV
Silan
Semiconductors
SC7313
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1
2002.02.26
4
(continued)
Parameter Symbol
Test
conditions
Min
Typ
Max
Unit
BASS CONTROL (note 1)
Control Range
G
B
Maximum boost/cut
12
14
16
dB
Step resolution
B
STEP
1
2
3
dB
Internal feedback resistance
R
B
34
44
58
k
TREBLE CONTROL (note 1)
Control Range
Gt
Maximum boost/cut
13
14
15
dB
Step resolution
T
STEP
1
2
3
dB
AUDIO OUTPUTS
Clipping level
V
OCL
THD=0.3%
2
2.5
Vrms
Output load resistance
R
L
4
k
Output load capacitance
C
L
10
nF
Output resistance
R
OUT
30
75
120
DC voltage level
V
OUT
4.2
4.5
4.8
V
GENERAL
BW=20 ~20kHz,flat
output muted
2.5
V
BW=20 ~20kHz,flat
All gains=0dB
5
15
V
Output noise
e
NO
A curve, all gains =0 dB
3
V
Signal to noise ratio
S/N
All gains=0dB; Vo=1Vrms
106
dB
Av=0,V
IN
=10mV
0.01
0.1
%
Av=-20dB, V
IN
=1Vrms
0.09
0.3
%
Distortion
d
Av=-20dB,V
IN
=0.3Vrms
0.04
%
Channel separation left/right
Sc
80
103
dB
AV=0 to 20 dB
0
1
dB
Total tracking error
AV=-20 to 60 dB
0
2
dB
BUS INPUTS
Input low voltage
V
IL
1
V
Input high voltage
V
IH
3
V
Input current
I
IN
-5
+5
A
Output voltage SDA acknowledge
Vo
Io=1.6mA
0.4
V
NOTES:
(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 2.2
F capacitor.
Silan
Semiconductors
SC7313
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.1
2002.02.26
5
TYPICAL CHARACTERISTICS PERFORMANCE
Fig.1 Loudness vs. Volume
Attention
Volume Attention (dB)
Loudnes
s
(
dB)
0
10
20
30
40
50
0
5
10
15
20
Fig.2 Loudness vs. Frequency vs.
volume Attenuation
Frequency (Hz)
Loudnes
s
(
dB)
-60
-40
-20
0
20
100
1k
10k
Fig.3 Loudness vs. External
Capacitors
Loudnes
s
(
dB)
-40
-30
-20
-10
10
100
1k
10k
100k
Frequency (Hz)
OPEN
10nF
56nF
100nF
220nF
Shorted to VREF
No
ise
(
V
Volume (dB)
Fig.4 Noise vs.Volume/Gain
settings
-80
-60
-40
0
-20
1
3
10
22Hz ~ 22kHz
A Curve
Fig.5 Signal to Noise Ratio
vs.Volume settings
Volume (dB)
No
ise
(
V
-60
-40
-20
0
20
1
10
100
1k
10k
100k
1V
-80
VIN=1V
VIN=316V
S/N=106dB
S/N=76dB
Frequency (dB)
100
1k
10k
100k
10
10
-3
10
-2
10
-1
1
Fig.6 Distortion & Noise vs.
Frequency
VIN=1Vrms
AV=0dB
All controls Flat
Volume=-20dB
Volume=0dB
THD
&
No
ise
(
%
)
Frequency (dB)
100
1k
10k
100k
10
10
-3
10
-2
10
-1
1
Fig.7 Distortion & Noise vs.
Frequency
VIN=250mVrms
AV=0dB
All controls Flat
Volume=-20dB
Volume=0dB
THD
&
No
ise
(
%
)
Fig.8 Distortion vs. Load
Resistance
Load Resistance (k
)
0.1
1
10
-1
10
-2
THD
(
%
)
Fig.9 Channel Separation(L
R) vs.
Frequency
10
1
10
2
10
3
10
4
70
80
90
100
110
C
hannel
Separat
i
o
n
(
dB)
Frequency (Hz)
VIN=1Vrms
AV=0dB
All controls Flat
C
LOUD=
100nF
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