TOSHIBA TC9235P/F TOSHIBA CMOS DIGITAL INTEGRATED CIRCUIT SILICON MONOLITHIC TC9235P, TC9235F ELECTRONIC VOLUME The TC9235P and TC9235F are an optimum CMOS IC TC9235P which has been designed for electronization of volume control of audio equipment, ete. FEATURES @ Attenuation can be controlled from OdB to -78dB by up, down input. DIP16-P-300-2.54A @ This IC have 20dB tap for loudness circuit. TC9235F @ 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. SOP16-P-300-1.27 @ Package is DIP16 and SOP16. Weight DIP 16-P-300-2.54A : 1.0g (Typ.) SOP16-P-300-1.27 : 0.16g (Typ.) PIN CONNECTION BLOCK DIAGRAM Vss Vbb OUT-1 OUT-2 Vss VpD IN-1 IN-2 OUT-1 QUT-2 TP-1 TP-2 IN-1 IN-2 TPA 1P.2 GND-1 GND-2 GND-1 GND-2 uF DC-OUT DECODER D-A mn Na - UP/DOWN CONVERTER | il cout ose INT _ _ DN COUNTER INH CONTROL Osc INT 980508EBA2 @ TOSHIBA is continually working to improve the quality and the reliability of its products. Nevertheless, semiconductor devices in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing TOSHIBA products, to observe standards of safety, and to avoid situations in which a malfunction or failure of a TOSHIBA product could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that TOSHIBA products are used within specified operating ranges as set forth in the most recent products specifications. Also, please keep in mind the precautions and conditions set forth in the TOSHIBA Semiconductor Reliability Handbook. 1998-05-15 1/10TOSHIBA TC9235P/F PIN FUNCTION NO SYMBOL PIN NAME FUNCTION AND OPERATION NOTE 1 Vss Negative power supply pin . 16 Vpp Positive power supply pin Power supply terminal _ 2 OUT-1 | . 15 OUT-2 Volume output pins Volume circuit 3 IN-1 i i OUT 14 IN-2 Volume input pins 4 TP-1 Tap output pins for TP o4 7 13 TP-2 loudness ano ()J 5 GND-1 Anal dvi 1D GND2 nalog ground pins ae . . Volume up, down control input pin. P Vol 6 U glume up input pin The 1 step/1 push volume is controlled by | Built-in pushing the Up or Down key. If the key pull-up a i resistor 7 DN Volume down input pin has been pushed continuously, the i continuous volume control. Oscillation pin. 8 Osc Oscillation pin Oscillator circuit consist of C-R connection. Oscillation is executed while key is pushed. . . ae Built-in epee wae pecs . Input pin for setting initial volume level 9 INT Initializing pin volume level set to 46dB by L input. pull-up resistor Back up mode input pin. 10 ind 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. D n for level oe 11 DCc-OUT ee pin tor leve DC voltage which is corresponded to volume step is generated. 980508EBA2" @ The products described in this document are subject to foreign exchange and foreign trade laws. @ The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by TOSHIBA CORPORATION for any infringements of intellectual property or other rights of the third parties which may result from its use. No license is granted by implication or otherwise under any intellectual property or other rights of TOSHIBA CORPORATION or others. @ The information contained herein is subject to change without notice. 1998-05-15 2/10TOSHIBA TC9235P/F OPERATION 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 (3.9kQ) is connected between TP pin and GND pin. @ Equivalence circuit @ Volume step and attenuation (Attenuation is as follows when resistor (3.9kQ) is our C-____ connected between TP pin and GND pin.) ww O4R-+ 50 STEP ATTENUATION STEP ATTENUATION 7 bt. 0 0 (dB) 16 32 (dB) g 1 2 17 34 tk Sp 2 4 18 36 veska 4 i 3 6 19 38 1 rt 4 8 20 40 t ' 4! 5 10 21 42 ? P : , 6 12 *22 46 $ 7 14 23 50 ~O_t L 8 16 24 54 OT BR " 9 18 25 58 tpst $11 10 20 26 62 i | | 11 22 27 66 20.25kQ < ! ' rot 12 24 28 70 J! 13 26 29 74 i BS S50 14 28 30 78 Ls 15 30 31 co GND O-+_3}+ $31 * Step 22 (46dB) initial value. 1998-05-15 3/10TOSHIBA TC9235P/F 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. e If UP, DN key is input L continuously, volume level is changed continuously. @ Timing of key input UP/DN INPUT a XXX X eb ee (ose = 20Hz) t : Prevent time for chattering = 2.2x1/fosc(~110ms) T : Switching time to automatic mode * 10x1/fosc (~500ms) a: Up, Down speed = 2x1/fose (=100ms) fosc#Ox-Rx (Hz) : Rx = 12~220k2, 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 ~22kQ) (typ.) is high, If input impedance of next setting level meter IC is low, set to Buffer. @ Equivalence circuit @ Volume step and Output voltage OR STEP ATTENUATION] OUTPUT VOLTAGE Lo foo 4 cour (dB) (Vv) $R 0~ 3 0~ 6 7/8 VoD 2R [> I 4~ 7 8~14 6/8 Vpp Poo f>o fh 7 8~11 16~22 5/8 Vpp Wr vA SR 12~15 24~30 4/8 Vpp a 16~19 32~38 378 Vpp R22kQ, 20~23 40~50 278 Vpp 24~27 54~66 1/8 Vpp 28~31 70~00 0 1998-05-15 4/10TOSHIBA TC9235P/F 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. Vpb =O a a or INT a a VIL vo a L a a OV * t t2 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 a 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. Ov DV reece nema... t+ Fee e eee VpDMIN = 2.0V / | Minimum Voltage for Back up is 2.0V. / Back up data is lost inn / ee ee ee _/. NORMAL MODE BACKUP MODE | NORMAL MODE 1998-05-15 5/10TOSHIBA TC9235P/F MAXIMUM RATINGS (Ta = 25C) CHARACTERISTIC SYMBOL RATING UNIT Supply Voltage Vpp -0.3~15 Vv Input Voltage VIN -0.3~Vpp + 0.3 V Power Dissipation PD 300 mW Operating Temperature Topr -40~85 C Storage Temperature tstg -55~150 C ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Ta = 25C, Vpp =9V) TEST CHARACTERISTIC SYMBOL | CIR- TEST CONDITION MIN. | TYP. | MAX. | UNIT CUIT Operating Supply Vv |Ta= -40~85 4, , 12| Vv Voltage DD a 0~85C 5 9.0 Operating Supply _ Current IDD 1 |No load, fosc =20Hz 0.3 1.0] mA Backup Voltage VoD wey" 2.0 ~ 12 Vv Backup Current lop 1 - | 0.01 1.0 | A VDD H" Level Vv ~ V Input Y IH . . x0.7 DD Voltage |All input pin Vpp V L Level Vv 0 ~ vi IL x0.3 Input H" Level iH J ViH=Vpp| -1 _ 1 Current | L Level NL ]INH input pin vipzov | -1 | 7| 2A Pull Up Resistor Rup | UP, DN, INT input pin 23 47 71] kO Volume Resistor RvR |Between IN->GND resistor 31 44 58 | kO Analog Switch ON Ron | |Analog switch ON resistor | 500] soo] Resistor Attenuation Error AATT 0] +2.0 | dB Balance Between Left Volume resistor error between _ + 0 And Right ARVR left and right 0 | #30) % Total Harmonic 0 Distortion THD fin = 1kHz OdB _ 0.01 _ % Maximum Attenuation | ATTyax | 1 VIN = 1Vrms oo dB 100 | dB RL = 100k0, Cross Talk CT 100 | dB : Rg = 6000 OdB Output Noise Voltage VN 20) |eVrms OSC Frequency fosc 1 |Cy=2.2uF, RX =33k0 20; Hz 1998-05-15 6/10TOSHIBA TEST CIRCUIT 1 L VM : RL (1/2 Vpp) THD - Vout fin = 1kHz, Rg= 6000, RL = 100kQ, HPF =20Hz LPF = 80kHz 0.1 THD (%) 0.01 0.001 0.01 Vout (Vrms) RL TC9235P/F VM (1/2 Vpp) Vppb LD CHARACTERISTIC 100 1000 10000 100000 fin (Hz) 1998-05-15 7/10TOSHIBA TC9235P/F EXAMPLE OF APPLICATION CIRCUIT Condenser for Backup 1/2 Vpp , \ ' ) a nN, +8 UP Key DOWN Key LEFT SIDE RIGHT SIDE LEVEL METER DRIVER IC HOU (Note) Loudness circuit is left side, only volume (without loudness) circuit is right side. C,=1500pF C2=O0.14F R=8.2k0, 1998-05-15 8/10TOSHIBA TC9235P/F OUTLINE DRAWING DIP16-P-300-2.54A 16 9 Clo ro nN ') Fi T S T LCI CST Ly Ly LL Ld B * . 19.75MAX 4 19.25+0.2 . 0.95+0.1 +0.2 4.15+0.3 0.735TYP Weight : 1.0g (Typ.) 1998-05-15 9/10TOSHIBA TC9235P/F OUTLINE DRAWING SOP16-P-300-1.27 Unit : mm 16 9 RRARAARR fF A = Hil G6 8 o.705TYP| | L 0.4920-1 (510.25 @ 1.27 le 10.8MAX > L 10.3+0.2 . tp =e | FT Ete) oy 70.11 , | 0.80.2 Weight : 0.16g (Typ.) 1998-05-15 10/10