SILAN SC9235, SC9235S Datasheet
Silan
Semiconductors
ELECTRONIC VOLUME
DESCRIPTION
The SC9235 and SC9235S are an optimum CMOS ICwhich
has been designedfor electronization of volume control of audio
equipment, etc.
FEATURES
* Attenuation can be controlled from 0dB to -78dB by up, down
input.
* This IChave 20dB tap for loudness circuit.
* This IC features a built-in DC output circuit (7 level) for volume
level meter.
* Polysilicon resistors enables low-distortion, high-performance
volume systems.
* Volume level remains in backup mode with low current
consumption.
* Package is DIP16 and SOP16.
PIN CONFIGURATION BLOCK DIAGRAM
SC9235
SOP-16
DIP-16
ORDERING INFORMATION
SC9235 DIP-16 Package
SC9235S SOP-16 Package
V
16
15
14
13
12
11
10
9
DD
OUT-2
IN-2
TP-2
GND-2
DC-OUT
INH
INT
V
OUT-1
IN-1
TP-1
GND-1
OSC
V
SS
1
OUT-1
IN-1
TP-1
GND-1
OSC
UP
DN
2
3
4
5
DECODER
6
UP/DOWN
COUNTER
D-A
CONVERTER
7
CONTROL
8
SS
1
2
3
4
SC9235
5
UP
6
DN
7
8
16
15
14
13
12
11
10
9
DD
V
OUT-2
IN-2
TP-2
GND-2
DC-OUT
INH
INT
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
1
Silan
Semiconductors
ABSOLUTE MAXIMUM RATINGS
Characteristic Symbol Value Unit
Supply Voltage V
Input Voltage V
PowerDissipation P
Operating Temperature Topr -40 ~ +85
Storage Temperature Tstg -55 ~ +150
ELECTRICAL CHARACTERISTICS
Parameter Symbol Test Conditions Min Typ Max Unit
Operating Supply Voltage V
Operating Supply Current I
Backup Voltage V
Backup Current I
Input Voltage
Input Current
Pull Up Resistor R
Volume Resistor R
Analog Switch ON Resistor R
Attenuation Error
Balance Between Left And Right
Total Harmonic Distortion THD 0dB -- 0.01 -- %
Maximum Attenuation ATT
Cross Talk
Output Noise Voltage V
OSC Frequency f
"H" Level V
"L" Level V
"H" Level I
"L" Level I
DD
DD
QD
QD
IH
IL
IH
IL
UP
VR
ON
∆ATT
∆R
VR
MAX
C.T
N
OSC
(Ta=25°C)
DD
IN
D
-0.3 ~15 V
-0.3V ~ VDD+0.3V V
300 mW
(Unless otherwise specified, Ta = 25k,V
Ta=-40 ~ 85°C
No load,fosc=20Hz -- 0.3 1.0
="L"
INH
All input pin
input pin
INH
UP,DN,INT
VIH=V
Input pin
V
=0V -1 -- 1
IL
0.7V
DD
BetweenINGND resistor 31 44 58
Analog switch ON resistor -- 500 800
-- -- 0
Volume resistor error between
left and right
F
1kHz
IN=
V
=1Vrms
IN
R
=100kΩ
L
Rg=600Ω
∞dB
0dB
Cx=2.2µF, Rx=33kΩ
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
2
SC9235
°C
°C
9V)
=
DD
4.5 9.0 12 V
2.0 -- 12 V
-- 0.01 1.0
-- V
DD
0--0.3V
-1 -- 1
23 47 71
-- 0
-- 100 -- dB
-- 100 -- dB
-- 2.0 --
-- 20 -- Hz
DD
DD
±2.0
±3.0
µVrms
Rev: 1.0 2000.12.31
µA
µA
µA
kΩ
kΩ
dB
V
Ω
%
Silan
Semiconductors
PIN DESCRIPTION
Pin No. Symbol Pin Name Description
1 Vss Negative power supply pin
16 V
2OUT-1
15 OUT-2
3IN-1
14 IN-2
4TP-1
13 TP-2
5 GND-1
12 GND-2
6
7
8 OSC Oscillation pin
9
10
11 DC-OUT DCoutput pin for level meter
UP
DN
INT
INH
Positive power supply pin
DD
Volume output pins
Volume input pins
Tap output pins for loudness
Analog ground pins
Volume up input pin
Volume down input pin
Initializing pin
Inhibit terminal
Power Supply terminal
Volume circuit
OUT
IN
TP
GND
Volume up, down control input pin.
The 1 step / 1 push volume is controlled by pushing
the Up or Down key . If the key has been pushed
continuously, the continuous volume control.
These two input pins have built-in pull-up resistor.
Oscillation pin.
Oscillator circuit consist of C.R connection.
Oscillation is executed while key is pushed.
Input pin for setting initial volume level volume level
set to 46dB by "L" input.
This input pin has built-in pull-up resistor.
Back up mode input pin.
Internal all operation is stopped by "L" input, and
volume level remains with low current consumption.
DC output pin for volume level meter.
DC voltage which is corresponded to volume step is
generated.
SC9235
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
3
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