SC9260
2-CH ELECTRONIC VOLUME CONTROLLER CONTROLLED BY SERIAL
INTERFACE WITH LOUDNESS CONTROL
DESCRIPTION
The SC9260 and SC9260S are an optimum CMOS with I
2
C interface
on Chip, which has been designed for electrification of volume control
of audio equipment, etc.
FEATURES
* Attenuation can be controlled from 0dB to -78dB by 2dB/step.
* This ICs feature a built-180in loudness circuit.(20dB tap)
* The volume, balance and loudness circuits can be controlled by I
2
C
series data.
* CS (Chip Select) input allows control of up to 2 of this chip on the
same bus.
* Use Polysilicon resistors enable low-distortion, high-performance
volume system.
* Package is DIP-16 and SOP-16
DIP-16-300-2.54
SOP-16-300-1.27
ORDERING INFORMATION
Device
SC9260
SC9260S
Package
DIP-16-300-2.54
SOP-16-300-1.27
APPLICATIONS
* Digital volume control Radio
* CD, VCD and DVD system volume control
* DTS system volume control
* Audio system volume control
BLOCK DIAGRAM
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
12
REV:1.0
2004.08.03
Page 1 of
SC9260
ABSOLUTE MAXIMUM RATINGS
(T
amb
=25°C)
Characteristics
Supply Voltage
Input Voltage
Power Dissipation
Operating Temperature
Storage Temperature
Symbol
V
DD
V
IN
P
D
T
opr
T
stg
Value
-0.3~15
-0.3~V
DD
+0.3
300
-40~85
-55~150
Unit
V
V
mW
°C
°C
ELECTRICAL CHARACTERISTICS
(Unless otherwise specified, T
amb
=25°C, V
DD
=9 V)
Characteristics
Operating Supply Voltage
Operating Supply Current
Input Voltage
“ Level
H”
“ Level
L”
“ Level
H”
Input Voltage
“ Level
L”
“ Level
H”
“ Level
L”
V
IL(2)
I
IH
I
IL
RVR
RON
∆ATT
∆RVR
THD
ATTM
CT
V
N
fop
T
CK
T
STB
Volume error between left
and right
f
IN
=1kHz
V
IN
=1Vrms
R
L
=100KΩ
R
g
=600Ω
CK, DATA, STB
CK input
STB input
0dB
dB
0dB
V
IH
=V
DD
V
IL
=0V
Symbol
V
DD
I
DD
V
IH(1)
V
IL(1)
V
IH(2)
CS input pin
Test condition
Tamb=-40~85°C
No load
CK, DATA, STB input pin
V
DD
=4.5~12V
Min.
4.5
-
4.0
0
V
DD
x0.
7
0
-1
-1
20
-
-
-
-
-
-
-
-
-
-
Typ.
9.0
0.3
-
-
-
Max.
12
1.0
V
DD
1.0
V
DD
V
DD
x0.
3
1
1
37
600
±2
±3
-
-
-
-
500
1.0
2.0
µA
kΩ
Ω
dB
%
%
dB
dB
µVrms
kHz
µs
V
Unit
V
mA
V
-
-
-
28
250
0
0
0.01
100
100
2.0
-
0.5
1.0
Input Current
All input pin
Volume Resistance Value
Analog Switch ON Resistance
Attenuation Error
Volume Balance Between Left
And Right
Total Harmonic Distortion
Maximum Attenuation
Cross Talk
Output Noise Voltage
Operation Frequency
Minimum Pulse Width
Loudness “
OFF”
-
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
12
REV:1.0
2004.08.03
Page 2 of
SC9260
PIN CONFIGURATION
PIN DESCRIPTIONS
Pin no.
1
2
3
4
5
6
Pin name
V
SS
L-OUT
L-IN
L-LD1
L-LD2
L-GND
Digital ground pin
Left channel volume output pin
Left channel volume input pin
Left channel tap output pins for loudness (1)
Left channel tap output pins for loudness (2)
Analog ground pins
Chip select input pin.
Input pin for designating chip select code. This pin correspond to bit
7
CS
“ which is chip select bit in serial data.
C1”
When CS=” and C1=” , data is valid.
1”
1”
When CS=” and C1=” , data is valid.
0”
0”
8
CK
Clock input pin.
Clock input for data transfer.
Data input pin.
9
DATA
Attenuation channel selection data input terminal. Data consists of
13 bits and input by CK signal.
Strobe input pin.
10
11
12
13
14
15
STB
R-GND
R-LD2
R-LD1
R-IN
R-OUT
Attenuation setting signal take from DATA and CK terminals are
latched when this terminal is placed at “ level.
H”
Analog ground pins
Right channel tap output pins for loudness (2)
Right channel tap output pins for loudness (1)
Right channel volume input pin
Right channel volume output pin
Description
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
12
REV:1.0
2004.08.03
Page 3 of
SC9260
16
V
DD
Power supply pin.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
12
REV:1.0
2004.08.03
Page 4 of
SC9260
FUNCTION DESCRIPTION
1. Volume circuit
Volume circuit consist of ladder resistor and analog switch.
Tap for loudness is connected to step 10 (20dB). Loudness operation is controlled by LS1/LS2 switches.
Equivalence circuit
Volume step and attenuation
Step
K0
K1
K2
K3
K4
K5
K6
K7
K8
K9
K10
K11
K12
K13
K14
K15
K16
K17
K18
K19
K20
attenuation
0(dB)
2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
step
K21
K22
K23
K24
K25
K26
K27
K28
K29
K30
K31
K32
K33
K34
K35
K36
K37
K38
K39
K40
attenuation
42
44
46
48
50
52
54
56
58
60
62
64
66
68
70
72
74
76
78
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http: www.silan.com.cn
12
REV:1.0
2004.08.03
Page 5 of
Microchip MCU
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