Silan Semiconductors SC9235 ELECTRONIC VOLUME DESCRIPTION The SC9235 and SC9235S are an optimum CMOS IC which SOP-16 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. DIP-16 * 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. ORDERING INFORMATION * Package is DIP16 and SOP16. PIN CONFIGURATION VSS 1 16 VDD OUT-1 2 15 OUT-2 IN-1 3 14 IN-2 TP-1 4 13 TP-2 GND-1 5 12 GND-2 UP 6 11 DC-OUT 7 10 INH OSC 8 9 INT DIP-16 Package SC9235S SOP-16 Package BLOCK DIAGRAM VSS 1 16 VDD OUT-1 2 15 OUT-2 IN-1 3 14 IN-2 TP-1 4 13 TP-2 GND-1 5 12 GND-2 11 DC-OUT 10 INH 9 INT SC9235 DN SC9235 DECODER D-A CONVERTER UP 6 DN 7 UP/DOWN COUNTER CONTROL OSC 8 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 1 2000.12.31 Silan Semiconductors SC9235 ABSOLUTE MAXIMUM RATINGS(Ta=25°C) Characteristic Symbol Value Unit Supply Voltage VDD -0.3 ~15 V Input Voltage VIN -0.3V ~ VDD+0.3V V Power Dissipation PD 300 mW Operating Temperature Topr -40 ~ +85 °C Storage Temperature Tstg -55 ~ +150 °C ELECTRICAL CHARACTERISTICS(Unless otherwise specified, Ta = 25k, Parameter VDD = 9V) Symbol Test Conditions Min Typ Max Unit Operating Supply Voltage VDD Ta=-40 ~ 85°C 4.5 9.0 12 V Operating Supply Current IDD No load,fosc=20Hz -- 0.3 1.0 μA Backup Voltage VQD 2.0 -- 12 V Backup Current IQD -- 0.01 1.0 μA 0.7VDD -- VDD 0 -- 0.3VDD VIH=VDD -1 -- 1 VIL=0V -1 -- 1 Input Voltage Input Current "H" Level VIH "L" Level VIL "H" Level IIH "L" Level IIL INH ="L" All input pin INH input pin V μA Pull Up Resistor RUP UP , DN , INT Input pin 23 47 71 kΩ Volume Resistor RVR Between INGND resistor 31 44 58 kΩ Analog Switch ON Resistor RON Analog switch ON resistor -- 500 800 Ω -- 0 ±2.0 dB -- 0 ±3.0 % Attenuation Error ΔATT Balance Between Left And Right ΔRVR Total Harmonic Distortion THD FIN=1kHz 0dB -- 0.01 -- % ATTMAX VIN=1Vrms ∞dB -- 100 -- dB Cross Talk C.T RL=100kΩ -- 100 -- dB Output Noise Voltage VN Rg=600Ω -- 2.0 -- μVrms -- 20 -- Hz Maximum Attenuation OSC Frequency fOSC -Volume resistor error between left and right Cx=2.2μF, Rx=33kΩ 0dB HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 2 2000.12.31 Silan Semiconductors SC9235 PIN DESCRIPTION Pin No. Symbol Pin Name 1 Vss Negative power supply pin 16 VDD Positive power supply pin 2 OUT-1 15 OUT-2 3 IN-1 14 IN-2 4 TP-1 13 TP-2 5 GND-1 12 GND-2 6 UP Description Power Supply terminal Volume output pins Volume circuit Volume input pins OUT IN 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 continuously, the continuous volume control. Volume down input pin 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 3 2000.12.31 Silan Semiconductors SC9235 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. * * Equivalence circuit Volume step and attenuation (Attenuation is as follows when resistor (3.9kΩ) is connected between TP pin and GND pin.) OUT IN 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 5 10 21 42 6 12 *22 46 S10 7 14 23 50 S11 8 16 24 54 9 18 25 58 10 20 26 62 11 22 27 66 12 24 28 70 13 26 29 74 14 28 30 78 15 30 31 ∞ S0 S1 S2 28.5kΩ S9 TP 20.25kΩ S30 GND S31 * Step 22 (46dB) initial value. HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 4 2000.12.31 Silan Semiconductors SC9235 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 UP / DN INPUT VOLUME LEVEL t T a (fOSC=20Hz) Note: t : Prevent time for chattering 2.21/fosc(110ms) T: Switching time to automatic mode 101/fosc(500ms) a : Up,Down speed 21/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 ≈ 22kΩ (typ.) is high, If input impedance of next setting level meter IC is low, set to Buffer. * Volume step and Output voltage Equivalence circuit 2R DC-OUT 2R 2R R Step Attenuation(dB) Output Voltage(V) 0~3 0~6 7/ 8 VDD 4~7 8 ~ 14 6/ 8 VDD 8 ~ 11 16 ~ 22 5/ 8 VDD 12 ~ 15 24 ~ 30 4/ 8 VDD 16 ~ 19 32 ~ 38 3/ 8 VDD 20 ~ 23 40 ~ 50 2/ 8 VDD 24 ~ 27 54 ~ 66 1/ 8 VDD 28 ~ 31 70 ~ ∞ R R R≈22kΩ 0 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 5 2000.12.31 Silan Semiconductors SC9235 4. INITIALIZATION AND BACKUP OPERATION 1) Initialization operation When power on, volume level is set to initial value (46dB) by setting INT pin to "L" level for a while. VDD VDD INT VIL 0V t t≥1ms 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 Back up VDD 2V Back up data is lost INH 0V NORMAL MODE VDDMIN≥2.0V Minimum Voltage for Back up is 2.0V. BACKUP MODE NORMAL MODE HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 6 2000.12.31 Silan Semiconductors SC9235 TEST CIRCUITS VDD A 600Ω V-M V RL 1 16 2 15 3 14 4 13 SG 47μF 600Ω RX 12 6 11 7 10 8 9 CX RL SG 5 V-M V SC9235 1/2 VDD IDD/IQD 1/2 VDD INH VDD C INT THD —Vout LD CHARACTERISTIC 1 fin=1kHz,Rg=600Ω RL=100kΩ,HPF=20Hz LPF=80kHz 10 0 VDD=6.0V 0.1 THD (%) -10 -20 -30 0.01 -40 VDD=9.0V -50 VDD=12.0V 0.001 0.01 0.1 1 -60 10 10 100 1000 10000 100000 fin (Hz) Vout (Vrms) HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 7 2000.12.31 Silan Semiconductors SC9235 TYPICAL APPLICATION CIRCUIT Condenser for Backup 1/2 V DD +B 1 OUT VDD VSS 16 2 15 OUT 3 14 IN 4 13 5 12 L- ch R- ch C1 IN R 3.9kΩ 1/2 V DD C2 UP Key 6 UP DOWN Key 7 DN INH 10 8 OSC INT 9 Rx DC-OUT 3.9kΩ 1/2 V DD 11 4.7kΩ Cx LEFT SIDE RIGHT SIDE LEVEL METER DRIVER IC (Note) Loudness circuit is left side, only volume (without loudness) circuit is right side. C1=1500pF C1=0.1μF R=8.2kΩ HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 8 2000.12.31 Silan Semiconductors SC9235 PACKAGE OUTLINE 16-DIP-P-300 UNIT:mm 7.62 6.40 0.25 2.54 1.50 15 degree 3.30 5.08 3.51 19.4 0.46 16-SOP-P-225 UNIT:mm 5.72 3.95 6.00 0.41 1.27 10.20 1.95 9.80 HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD Rev: 1.0 9 2000.12.31