SC9235 SILAN | Alldatasheet
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Technical content
/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31 /G3 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.
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 SOP-16 /G3
ORDERING INFORMATION
PIN CONFIGURATION BLOCK DIAGRAM SC9235 VSS OUT-1 IN-1 TP-1 GND-1 OSC DC-OUT GND-2 TP-2 IN-2 OUT-2 VDD INH INT DN UP DECODER UP/DOWN COUNTER CONTROL D-A CONVERTER 1VSS OUT-1 IN-1 TP-1 GND-1 OSC DC-OUT GND-2 TP-2 IN-2 OUT-2 V DD INH INT DN UP
/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31 /G3 ABSOLUTE MAXIMUM RATINGS(Ta=25°C) Characteristic Symbol Value Unit Supply Voltage V DD -0.3 ~15 V Input Voltage V IN -0.3V ~ VDD+0.3V V Power Dissipation P D 300 mW Operating Temperature Topr -40 ~ +85 °C Storage Temperature Tstg -55 ~ +150 °C ELECTRICAL CHARACTERISTICS(Unless otherwise specified, Ta = 25/G107,V DD = 9V) Parameter Symbol Test Conditions Min Typ Max Unit Operating Supply Voltage V DD Ta=-40 ~ 85°C 4.5 9.0 12 V Operating Supply Current I DD No load,fosc=20Hz -- 0.3 1.0 μA Backup Voltage V QD 2.0 -- 12 V Backup Current I QD INH ="L" -- 0.01 1.0 μA "H" Level V IH 0.7VDD -- V DD Input Voltage "L" Level V IL All input pin 0- - 0 . 3 V DD V "H" Level I IH VIH=VDD -1 -- 1 Input Current "L" Level I IL INH input pin VIL=0V -1 -- 1 μA Pull Up Resistor R UP UP , DN , INT Input pin 23 47 71 kΩ Volume Resistor R VR Between IN/barb2rightGND resistor 31 44 58 kΩ Analog Switch ON Resistor R ON Analog switch ON resistor -- 500 800 Ω Attenuation Error ΔATT -- -- 0 ±2.0 dB Balance Between Left And Right ΔRVR Volume resistor error between left and right -- 0 ±3.0 % Total Harmonic Distortion THD 0dB -- 0.01 -- % Maximum Attenuation ATT MAX ∞dB -- 100 -- dB Cross Talk C.T -- 100 -- dB Output Noise Voltage V N FIN=1kHz VIN=1Vrms RL=100kΩ Rg=600Ω 0dB -- 2.0 -- μVrms OSC Frequency f OSC Cx=2.2μF, Rx=33kΩ -- 20 -- Hz
/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31 /G3 PIN DESCRIPTION Pin No. Symbol Pin Name Description
1 Vss Negative power supply pin
16 V DD Positive power supply pin
15 OUT-2
14 IN-2
13 TP-2
Tap output pins for loudness
5 GND-1
12 GND-2
6 UP Volume up input pin
7 DN Volume down input pin
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.
8 OSC Oscillation pin
Oscillation pin. Oscillator circuit consist of C.R connection. Oscillation is executed while key is pushed.
9 INT Initializing pin
Input pin for setting initial volume level volume level set to 46dB by "L" input. This input pin has built-in pull-up resistor.
10 INH Inhibit terminal
Back up mode input pin. Internal all operation is stopped by "L" input, and volume level remains with low current consumption.
11 DC-OUT DC output pin for level meter
DC output pin for volume level meter. DC voltage which is corresponded to volume step is generated.
/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31 /G3 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 (3.9kΩ) is connected between TP pin and pin. * Volume step and attenuation (Attenuation is as follows when resistor (3.9kΩ)i s connected between TP pin and GND pin.) Step Attenuation Step Attenuation 0 0(dB) 16 32(dB) 1 2 17 34 2 4 18 36 3 6 19 38 4 8 20 40 51 0 2 1 4 2 6 12 *22 46 71 4 2 3 5 0 81 6 2 4 5 4 91 8 2 5 5 8 10 20 26 62 11 22 27 66 12 24 28 70 13 26 29 74 14 28 30 78 15 30 31 ∞ * Equivalence circuit OUT IN TP GND S31 S30 S11 S10 28.5kΩ 20.25kΩ * Step 22 (46dB) initial value.
/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31 /G3 2. VOLUME UP, DOWN CONTROL CIRCUIT Volume up, down control is executed byUP , DN key input. * The 1 step / 1 push volume is controlled by "L" level ofUP , DN key. *I f UP , DN key is input "L" continuously, volume level is changed continuously. * Timing of key input tT a UP / DN INPUT VOLUME LEVEL (fOSC=20Hz) Note: t : Prevent time for chattering/G12c2.2/G681/fosc(/G12c110ms) T: Switching time to automatic mode/G12c10/G681/fosc(/G12c500ms) a : Up,Down speed/G12c2/G681/fosc(/G12c100ms) fosc/G12cCx•Rx(Hz) : Rx=12~220k/Ga1 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≈ 22kΩ (typ.) is high, If input impedance of next setting level meter IC is low, set to Buffer. * Volume step and Output voltage Step Attenuation(dB) Output Voltage(V) 0~3 0~6 7 /8V DD 4 ~ 7 8 ~ 14 6/ 8 V DD 8 ~ 11 16 ~ 22 5/ 8 V DD 12 ~ 15 24 ~ 30 4/ 8 V DD 16 ~ 19 32 ~ 38 3/ 8 V DD 20 ~ 23 40 ~ 50 2/ 8 V DD 24 ~ 27 54 ~ 66 1/ 8 V DD /circle6 Equivalence circuit DC-OUT R R R R≈22kΩ 28 ~ 31 70 ~∞ 0
/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31 /G3 4. INITIALIZATION AND BACKUP OPERATION 1) Initialization operation When power on, volume level is set to initial value (46dB) by settingINT pin to "L" level for a while. tt ≥1ms VDD VIL VDD INT Adjust condenser value which is setINT pin to the period whileINT pin is "L" level is longer than 1ms when Power on. 2) Backup operation Internal operation is all stopped whenINH pin is "L" level, and prohibit input and output. Volume data is remains while Backup mode with low current consumption. VDD NORMAL MODE BACKUP MODE NORMAL MODE VDD Back up Back up data is lost VDDMIN≥2.0V Minimum Voltage for Back up is 2.0V. INH
/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31 /G3 TEST CIRCUITS SC9235 V A V IDD/IQD 47μF V-M RLSG 600Ω VDD 1/2 VDD/G2c4/G2c5 CINTRX CX 1/2 VDD/G2c4/G2c5 V-M RL SG 600Ω VDD INH fin=1kHz,Rg=600Ω RL=100kΩ,HPF=20Hz LPF=80kHz THD —Vout THD (%) 0.001 0.01 0.1 Vout (Vrms) 0.01 0.1 1 10 10 100 1000 10000 100000 -60 -50 -40 -30 -20 -10 LD CHARACTERISTIC fin (Hz) VDD=6.0V VDD=9.0V VDD=12.0V
/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31 /G3 TYPICAL APPLICATION CIRCUIT VSS OSC DC-OUT VDD LEVEL METER DRIVER IC 4.7kΩ OUT IN R-ch OUT IN L-ch 1/2 VDD 1/2 VDD 3.9kΩ 3.9kΩ 1/2 VDD R Rx Cx LEFT SIDE RIGHT SIDE Condenser for Backup UP Key DOWN Key UP DN INH INT (Note) Loudness circuit is left side, only volume (without loudness) circuit is right side. C1=1500pF C1=0.1 μFR = 8 . 2 kΩ
/G3 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD /G3 Rev: 1.0 2000.12.31 /G3 PACKAGE OUTLINE 16-DIP-P-300 UNIT:mm 6.40 2.54 3.51 5.083.30 7.62 0.25 15 degree 0.46 19.4 1.50 16-SOP-P-225 UNIT:mm 6.00 3.95 5.72 1.95 10.20 9.80 1.27 0.41 /G3