TA8157AF/AFN TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA8157AF,TA8157AFN Stereo Headphone Power Amplifier (1.5V USE) The TA8157AF and TA8157AFN are developed for play-back stereo headphone equipments at low voltage operation (1.5V use). Those are built in bass boost function. Features * OCL (output condenser less) * Built-in ripple filter * Output power (VCC = 1.5V, f = 1kHz, THD = 10%, RL = 16) Po = 9mW (typ.) * Voltage gain: GV = 24dB (typ.) * Built-in boost amplifier * Built-in power switch * Built-in muting circuit * Low quiescent supply current (Ta = 25C) ICCQ = 8mA (typ.) * Excellent ripple rejection ratio: RR = 55dB (typ.) * Low noise: Vno = 25Vrms (typ.) * Operating supply voltage range (Ta = 25C) VCC (opr) = 0.9~2.2V Weight SSOP24-P-300-1.00: 0.32g (typ.) SSOP24-P-300-0.65A: 0.14g (typ.) Block Diagram 1 2002-10-30 TA8157AF/AFN Terminal Explanation (terminal voltage: Typical terminal voltage at no signal with test circuit, VCC = 1.2V, Ta = 25C) Terminal No. Name 1 BST SW 2 EQA 9 EQB 4 VREF 5 INA 7 INB 3 NFA 8 NFB 20 OUTA 18 OUTB 6 PRE GND Function Internal Circuit Terminal Voltage (V) Boost amplifier on / off switch (synchronized with equalizer circuit) VCC / OPEN: BST amp. ON GND: BST amp. OFF Equalizer circuit (controlled by BST SW) On resistance: 60 (typ.) Reference voltage 0.75 Input of power amplifier (This terminal is common with input of adder amplifier.) 0.75 NF of power amplifier 0.75 Output of power amplifier 0.6 10 MT SW Muting switch for power amplifier VCC: Power amp. ON GND / OPEN: Power amp. OFF 11 PW SW Power switch VCC: Power ON GND / OPEN: Power OFF 2 0 2002-10-30 TA8157AF/AFN Terminal No. Name 12 RF IN Function Internal Circuit Terminal Voltage (V) Ripple filter terminal 1.2 1.13 13 RF OUT Output of ripple filter Ripple filter circuit supplies VREF circuit, adder amplifier and boost amplifier with power source. 14 COMP Phase-compensation terminal for a ripple filter circuit 0.7 15 Base Base biasing terminal of transistor for ripple filter 0.5 16 VCC 1.2 17 PW GND 0 19 OUTC 24 INC 21 ADD OUT Output of center amplifier 0.6 Input of center amplifier 0.75 Output of adder amplifier Input of adder amplifier is common with input of power amplifier. 0.6 3 2002-10-30 TA8157AF/AFN Terminal No. Name 22 BST IN 23 BST OUT Function Internal Circuit Terminal Voltage (V) Input of boost amplifier 0.75 Output of boost amplifier (controlled by boost switch) BST ON: BST amp. ON BST OFF: BST amp. OFF (cut off input signal of BST amp.) 0.6 4 2002-10-30 TA8157AF/AFN Application Note (1) PW SW It is necessary to connect an external pull-down resistor with terminal PW SW (pin(11)), in case that this IC is turned on due to external noise etc. (2) MT SW The leak current flows through the terminal of MT SW (pin(10)), in case that this terminal is connected with VCC line independently, even though this IC is off-mode (the terminal of PW SW (pin(11)) is off-mode). It is necessary to connect an external pull-down resistor with terminal MT SW, in case that this IC is turned on due to external noise etc. (3) BST SW The leak current never flows through the terminal of BST SW (pin(1)) even though this terminal is at any condition, because the ripple filter circuit supplies the BST SW circuit with power source. The terminal of BST SW should not be applied higher voltage than VCC, to prevent IC from destruction. It is necessary to connect an external pull-up resistor with terminal BST SW, in case that this IC doesn't operate normally due to external noise etc. In case that boost amplifier is on, BST SW terminal should be appliied VCC ~(VCC-0.3V). (4) Input of amplifier Each input signal should be applied through a condenser. In case that DC current or DC voltage is applied to each amplifier, the internal circuit has unbalance and the each amplifier doesn't operate normally. It is advised that input signal refer to voltage of VREF, in order to reduce a pop sound. (5) Ripple filter It is necessary to connect a transistor for ripple filter, because this IC doesn't have transistor for ripple filter. Care should be taken to stabilize the ripple filter circuit, because the ripple filter circuit supplies VREF circuit, adder amplifier and boost amplifier with power source. 5 2002-10-30 TA8157AF/AFN Maximum Ratings (Ta = 25C) Characteristic Symbol Rating Unit Supply voltage VCC 4.5 V Output current IO (Peak) 100 mA Power dissipation TA8157AF TA8157AFN 400 PD (Note) 500 Operating temperature Topr -25~75 Storage temperature Tstg -55~150 mW C (Note) Derated above Ta = 25C in the proportion of 3.2mW / C for TA8157AF, and of 4mW / C for TA8157AFN. Electrical Characteristics Unless Otherwise Specified : VCC = 1.2V, RL = 16, Rg = 600, f = 1kHz, Ta = 25C SW 1: a, SW 2: a, SW 3: b, SW 4: a, SW 5: a SW 6: a, SW 7: ON, SW8: OPEN Characteristic Symbol Test Circuit ICC1 Quiescent supply current ICC2 1 Power amplifier stage ICC3 Voltage gain 1 GV1 Channel balance CB1 Output power 1 Po1 2 Test Condition Min. Typ. Max. Unit Power OFF, SW 1: b SW 2: b 0.1 5 A Power amp. OFF, SW2: b 2.4 4.0 Vin = 0 8 11.5 22 24 26 0 1.5 5 9 Vo (A) = Vo (B) = -22dBV VCC = 1.5V THD (A) = THD (B) = 10% 2 VCC = 1.5V THD (A) = THD (B) = 10% Vin (A) = Vin (B) = -Vin (C) f = 100Hz, * BTL operation SW 3: a, SW5: b 8 14 mA dB mW Output power 2 Po2 Total harmonic distortion THD 2 Po (A) = Po (B) = 1mW 0.6 1 % Output noise voltage Vno 2 BPF = 20Hz~20kHz, SW4: b 25 40 Vrms Cross talk CT 2 Vo = -22dBV, SW4: b 35 42 Ripple rejection ratio RR1 2 VCC = 1.0V, fr = 100Hz Vr = -32dBV, SW 7: OPEN 45 55 Muting attenuation ATT1 2 Vo = -22dBV, SW 2: ab 73 6 dB 2002-10-30 TA8157AF/AFN Symbol Test Circuit ADD amp. voltage gain GV2 2 ADD amp. maximum output voltage Vom2 BST amp. voltage gain Characteristic Min. Typ. Max. Unit Vin (A) = Vin (B), RL = 12k Vo (ADD) = -22dBV SW 3: a / b 15 17.5 20 dB 2 Vin (A) = Vin (B), RL = 12k THD (ADD) = 1%, SW3: a / b 80 130 mVrms GV3 2 Vo = -37dBV, RL = 16k SW 6: b 14 16.5 19 dB BST amp. maximum output voltage Vom3 2 THD (BST) = 3%, RL = 16k SW 6: b 55 90 mVrms BST amp. attenuation ATT3 2 Vo = -32dBV, SW 3: ab SW 6: b 73 dB VRF OUT 2 VCC = 1VIRF = 20mA 0.9 0.93 V Ripple rejection ratio RR4 2 VCC = 1VIRF = 20mA fr = 100Hz, Vr = -37dBV SW 7: OPEN 35 43 dB Equalizer on resistance RON 1 IEQ = 100A, SW 3: a SW 8: ON 60 On current I11 1 VCC = 0.9V, V4 0.5V SW 1: c, SW2: b 5 A Off voltage V11 1 VCC = 0.9V, V4 0.2V SW 1: d, SW2: b 0 0.3 V Off current I10 1 VCC = 0.9V, ICC 4.5mA SW 2: c 5 A On voltage V10 1 VCC = 0.9V, ICC 3.5mA SW 2: d 0 0.3 V Off current I1 1 VCC = 0.9V, IEQ = 100A V2 0.7V, SW 3: c, SW8: ON 5 A On voltage V1 1 VCC = 0.9V, IEQ = 100A V2 0.2V, SW 3: d, SW 8: ON 0.6 0.9 V Bass boost function stage Ripple filter output voltage Power switch Mute switch Boost switch Test Condition 7 2002-10-30 TA8157AF/AFN Test Circuit 1 (*) Tantalum condenser 8 2002-10-30 TA8157AF/AFN Test Circuit 2 (*) Tantalum condenser 9 2002-10-30 TA8157AF/AFN Characteristic Curves Unless Otherwise Specified: VCC = 1.2V, RL = 16, Rg = 600, f = 1kHz, Ta = 25C 10 2002-10-30 TA8157AF/AFN 11 2002-10-30 TA8157AF/AFN 12 2002-10-30 TA8157AF/AFN Package Dimensions Weight: 0.32g (typ.) 13 2002-10-30 TA8157AF/AFN Package Dimensions Weight: 0.14g (typ.) 14 2002-10-30 TA8157AF/AFN RESTRICTIONS ON PRODUCT USE 000707EBA * TOSHIBA is continually working to improve the quality and 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 comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such TOSHIBA products 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 TOSHIBA products specifications. Also, please keep in mind the precautions and conditions set forth in the "Handling Guide for Semiconductor Devices," or "TOSHIBA Semiconductor Reliability Handbook" etc.. * The TOSHIBA products listed in this document are intended for usage in general electronics applications (computer, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These TOSHIBA products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury ("Unintended Usage"). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of TOSHIBA products listed in this document shall be made at the customer's own risk. * The products described in this document are subject to the 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. 15 2002-10-30