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Silan Semiconductors
ELECTRONIC VOLUME
DESCRIPTION
The SC9235 and SC9235S are an optimum CMOS IC which has been designed for electronization of volume control of audio equipment, etc.
SC9235
SOP-16
FEATURES
* Attenuation can be controlled from 0dB to -78dB by up, down input. * This IC have 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.
DIP-16
ORDERING INFORMATION
SC9235 SC9235S DIP-16 Package SOP-16 Package
PIN CONFIGURATION
BLOCK DIAGRAM
VSS OUT-1 IN-1
1 2 3 4 5
DECODER D-A CONVERTER
16 15 14 13 12
VDD OUT-2 IN-2 TP-2 GND-2
VSS OUT-1 IN-1 TP-1 GND-1 UP DN OSC
1 2 3 4 SC9235 5 6 7 8
16 15 14 13 12 11 10 9
VDD OUT-2 IN-2 TP-2 GND-2 DC-OUT INH INT
TP-1 GND-1
UP DN
6 7
11
UP/DOWN COUNTER
DC-OUT
10
CONTROL
INH
OSC
8
9
INT
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
1
Silan Semiconductors
ABSOLUTE MAXIMUM RATINGS(Ta=25C)
Characteristic
Supply Voltage Input Voltage Power Dissipation Operating Temperature Storage Temperature
SC9235
Symbol
VDD VIN PD Topr Tstg
Value
-0.3 ~15 -0.3V ~ VDD+0.3V 300 -40 ~ +85 -55 ~ +150
Unit
V V mW C C
ELECTRICAL CHARACTERISTICS(Unless otherwise specified, Ta = 25k,
Parameter
Operating Supply Voltage Operating Supply Current Backup Voltage Backup Current Input Voltage "H" Level "L" Level Input Current Pull Up Resistor Volume Resistor Analog Switch ON Resistor Attenuation Error Balance Between Left And Right Total Harmonic Distortion Maximum Attenuation Cross Talk Output Noise Voltage OSC Frequency "H" Level "L" Level
VDD = 9V)
Symbol
VDD IDD VQD IQD VIH VIL IIH IIL RUP RVR RON ATT RVR THD ATTMAX C.T VN fOSC
Test Conditions
Ta=-40 ~ 85C No load,fosc=20Hz
INH ="L"
Min
4.5 -2.0 --
Typ
9.0 0.3 -0.01 ----47 44 500 0 0 0.01 100 100 2.0 20
Max
12 1.0 12 1.0 VDD 0.3VDD 1 1 71 58 800 2.0 3.0 ------
Unit
V A V A V A k k dB % % dB dB Vrms Hz
All input pin VIH=VDD VIL=0V
UP , DN , INT Input pin
0.7VDD 0
INH input pin
-1 -1 23 31 ---------
Between IN GND resistor Analog switch ON resistor -Volume resistor error between left and right FIN=1kHz VIN=1Vrms RL=100k Rg=600 Cx=2.2F, Rx=33k 0dB 0dB dB
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
2
Silan Semiconductors
PIN DESCRIPTION
Pin No.
1 16 2 15 3 14 4 13 5 12 6
SC9235
Description
Power Supply terminal
Symbol
Vss VDD OUT-1 OUT-2 IN-1 IN-2 TP-1 TP-2 GND-1 GND-2
UP
Pin Name
Negative power supply pin Positive power supply pin Volume output pins
Volume circuit
OUT IN
Volume input pins
Tap output pins for loudness
TP GND
Analog ground pins Volume up, down control input pin. Volume up input pin The 1 step / 1 push volume is controlled by pushing the Up or Down key . If the key has been pushed
7
DN
Volume down input pin
continuously, the continuous volume control. These two input pins have built-in pull-up resistor. Oscillation pin.
8
OSC
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
9
INT
Initializing pin
set to 46dB by "L" input. This input pin has built-in pull-up resistor. Back up mode input pin.
10
INH
Inhibit terminal
Internal all operation is stopped by "L" input, and volume level remains with low current consumption. DC output pin for volume level meter.
11
DC-OUT
DC output pin for level meter
DC voltage which is corresponded to volume step is generated.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
3
Silan Semiconductors
FUNCTION DESCRIPTION
1. VOLUME CIRCUIT
Volume circuit consist of ladder resistor and analog switch. Tap for loudness is connected to step 10 (20dB). Attenuation is as follows when resistor (3.9k) is connected between TP pin and pin.
SC9235
*
Equivalence circuit
*
Volume step and attenuation (Attenuation is as follows when resistor (3.9k) is
OUT IN S0 S1 S2 28.5k
connected between TP pin and GND pin.)
Step
0 1 2 3 4 5
Attenuation
0(dB) 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30
Step
16 17 18 19 20 21 *22 23 24 25 26 27 28 29 30 31
Attenuation
32(dB) 34 36 38 40 42 46 50 54 58 62 66 70 74 78
S9
6
TP S10 S11
7 8 9
20.25k
10 11
S30
12 13 14 15
GND
S31
* Step 22 (46dB) initial value.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
4
Silan Semiconductors
2. VOLUME UP, DOWN CONTROL CIRCUIT
Volume up, down control is executed by UP , DN key input. * The 1 step / 1 push volume is controlled by "L" level of UP , DN key. * If UP , DN key is input "L" continuously, volume level is changed continuously. * Timing of key input
SC9235
UP / DN INPUT VOLUME LEVEL
t
T (fOSC =20Hz)
a
Note: t : Prevent time for chattering 2.2h1/fosc(110ms) T: Switching time to automatic mode 10h1/fosc(500ms) a : Up,Down speed 2h1/fosc(100ms) foscCx*Rx(Hz) : Rx=12~220k
3. DC OUTPUT CIRCUIT FOR VOLUME LEVEL
DC output for volume level meter is internally connected to D-A converter (R/2R type). 8 stage output voltage which is corresponded to volume level is generated. Because output impedance 22k (typ.) is high, If input impedance of next setting level meter IC is low, set to Buffer.
Equivalence circuit
* Volume step and Output voltage
Step
2R DC-OUT 2R 2R R R
Attenuation(dB)
0~6 8 ~ 14 16 ~ 22 24 ~ 30 32 ~ 38 40 ~ 50 54 ~ 66 70 ~
Output Voltage(V)
7/ 8 VDD 6/ 8 VDD 5/ 8 VDD 4/ 8 VDD 3/ 8 VDD 2/ 8 VDD 1/ 8 VDD 0
0~3 4~7 8 ~ 11 12 ~ 15
R R22k
16 ~ 19 20 ~ 23 24 ~ 27 28 ~ 31
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
5
Silan Semiconductors
4. INITIALIZATION AND BACKUP OPERATION
1) Initialization operation
SC9235
When power on, volume level is set to initial value (46dB) by setting INT pin to "L" level for a while.
VDD
VDD
VIL 0V t
INT
t1ms
Adjust condenser value which is set INT pin to the period while INT pin is "L" level is longer than 1ms when Power on.
2) Backup operation Internal operation is all stopped when INH pin is "L" level, and prohibit input and output. Volume data is remains while Backup mode with low current consumption.
VDD VDD 2V 0V NORMAL MODE INH BACKUP MODE Back up VDDMIN2.0V Minimum Voltage for Back up is 2.0V. Back up data is lost NORMAL MODE
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
6
Silan Semiconductors
TEST CIRCUITS
VDD A IDD/IQD
SC9235
1 2
600 V-M V RL SG
16 15 14 13 SC9235
SG 600
47F
3 4 5
V RL
V-M
12 11 10 9
CINT INH VDD 1/2 VDD
1/2 VDD
6 7 8
RX CX
THD --Vout
1 fin=1kHz,Rg=600 RL=100k,HPF=20Hz LPF=80kHz VDD=6.0V 0.1 10 0 -10 -20 -30 0.01 VDD=9.0V VDD=12.0V 0.001 0.01 -40 -50 -60 10
LD CHARACTERISTIC
THD (%)
0.1
1
10
100
1000
10000
100000
Vout (Vrms)
fin (Hz)
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
7
Silan Semiconductors
TYPICAL APPLICATION CIRCUIT
SC9235
Condenser for Backup 1/2 VDD +B
1
OUT L-ch IN C1 R 3.9k 1/2 VDD UP Key DOWN Key Rx
VSS
VDD
16 15 14 13 12
3.9k OUT R-ch IN
2 3 4 5 6 7 8
UP DN OSC DC-OUT INH INT
1/2 VDD
C2
11 10 9
4.7k
Cx
LEFT SIDE LEVEL METER DRIVER IC
RIGHT SIDE
(Note) Loudness circuit is left side, only volume (without loudness) circuit is right side. C1=1500pF C1=0.1F R=8.2k
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
8
Silan Semiconductors
PACKAGE OUTLINE
SC9235
UNIT:mm
2.54
16-DIP-P-300
6.40
1.50 19.4
7.62
15 degree
3.51
0.46
16-SOP-P-225
0.41
3.30
5.08
0.25
UNIT:mm
1.27 10.20 9.80
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
9
1.95
6.00
3.95
5.72

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