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ta8157af/afn 2002-10-30 1 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 (v cc = 1.5v, f = 1khz, thd = 10%, r l = 16 ? ) p o = 9mw (typ.) voltage gain: g v = 24db (typ.) built ? in boost amplifier built ? in power switch built ? in muting circuit low quiescent supply current (ta = 25c) i ccq = 8ma (typ.) excellent ripple rejection ratio: rr = 55db (typ.) low noise: v no = 25v rms (typ.) operating supply voltage range (ta = 25c) v cc (opr) = 0.9~2.2v block diagram weight ssop24 ? p ? 300 ? 1.00: 0.32g (typ.) ssop24 ? p ? 300 ? 0.65a: 0.14g (typ.)
ta8157af/afn 2002-10-30 2 terminal explanation (terminal voltage: typical terminal voltage at no signal with test circuit, v cc = 1.2v, ta = 25c) terminal no. name function internal circuit terminal voltage (v) 1 bst sw boost amplifier on / off switch (synchronized with equalizer circuit) v cc / open: bst amp. on gnd: bst amp. off D 2 eq a 9 eq b equalizer circuit (controlled by bst sw) on resistance: 60 ? (typ.) D 4 v ref reference voltage 0.75 5 in a 7 in b input of power amplifier (this terminal is common with input of adder amplifier.) 0.75 3 nf a 8 nf b nf of power amplifier 0.75 20 out a 18 out b output of power amplifier 0.6 6 pre gnd D D 0 10 mt sw muting switch for power amplifier v cc : power amp. on gnd / open: power amp. off D 11 pw sw power switch v cc : power on gnd / open: power off D
ta8157af/afn 2002-10-30 3 terminal no. name function internal circuit terminal voltage (v) 12 rf in ripple filter terminal 1.2 13 rf out output of ripple filter ripple filter circuit supplies v ref circuit, adder amplifier and boost amplifier with power source. 1.13 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 v cc D D 1.2 17 pw gnd D D 0 19 out c output of center amplifier 0.6 24 in c input of center amplifier 0.75 21 add out output of adder amplifier input of adder amplifier is common with input of power amplifier. 0.6
ta8157af/afn 2002-10-30 4 terminal no. name function internal circuit terminal voltage (v) 22 bst in input of boost amplifier 0.75 23 bst out 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
ta8157af/afn 2002-10-30 5 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 v cc 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 v cc , 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 v cc ~(v cc 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 v ref , 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 v ref circuit, adder amplifier and boost amplifier with power source.
ta8157af/afn 2002-10-30 6 maximum ratings (ta = 25c) characteristic symbol rating unit supply voltage v cc 4.5 v output current i o (peak) 100 ma ta8157af 400 power dissipation TA8157AFN p d (note) 500 mw operating temperature t opr 25~75 storage temperature t stg 55~150 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 : v cc = 1.2v, r l = 16 ? , r g = 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, sw 8 : open characteristic symbol test cir cuit test condition min. typ. max. unit i cc1 power off, sw 1 : b sw 2 : b D 0.1 5 a i cc2 power amp. off, sw 2 : b D 2.4 4.0 quiescent supply current i cc3 1 v in = 0 D 8 11.5 ma voltage gain 1 g v1 22 24 26 channel balance cb1 2 v o (a) = v o (b) = 22dbv D 0 1.5 db output power 1 p o1 v cc = 1.5v thd (a) = thd (b) = 10% 5 9 D output power 2 p o2 2 v cc = 1.5v thd (a) = thd (b) = 10% v in (a) = v in (b) = v in (c) f = 100hz, * btl operation sw 3 : a, sw 5 : b 8 14 D mw total harmonic distortion thd 2 p o (a) = p o (b) = 1mw D 0.6 1 % output noise voltage v no 2 bpf = 20hz~20khz, sw 4 : b D 25 40 v rms cross talk ct 2 vo = 22dbv, sw4: b 35 42 D ripple rejection ratio rr1 2 v cc = 1.0v, f r = 100hz v r = 32dbv, sw 7 : open 45 55 D power amplifier stage muting attenuation att1 2 v o = 22dbv, sw 2 : a b D 73 D db
ta8157af/afn 2002-10-30 7 characteristic symbol test cir cuit test condition min. typ. max. unit add amp. voltage gain g v2 2 v in (a) = v in (b) , r l = 12k ? v o (add) = 22dbv sw 3 : a / b 15 17.5 20 db add amp. maximum output voltage v om2 2 v in (a) = v in (b) , r l = 12k ? thd (add) = 1%, sw 3 : a / b 80 130 D mv rms bst amp. voltage gain g v3 2 v o = 37dbv, r l = 16k ? sw 6 : b 14 16.5 19 db bst amp. maximum output voltage v om3 2 thd (bst) = 3%, r l = 16k ? sw 6 : b 55 90 D mv rms bass boost function stage bst amp. attenuation att3 2 v o = 32dbv, sw 3 : a b sw 6 : b D 73 D db ripple filter output voltage v rf out 2 v cc = 1v i rf = 20ma 0.9 0.93 D v ripple rejection ratio rr4 2 v cc = 1v i rf = 20ma f r = 100hz, v r = 37dbv sw 7 : open 35 43 D db equalizer on resistance r on 1 i eq = 100a, sw 3 : a sw 8 : on D 60 D ? on current i 11 1 v cc = 0.9v, v 4 0.5v sw 1 : c, sw 2 : b 5 D D a power switch off voltage v 11 1 v cc = 0.9v, v 4 0.2v sw 1 : d, sw 2 : b 0 D 0.3 v off current i 10 1 v cc = 0.9v, i cc 4.5ma sw 2 : c 5 D D a mute switch on voltage v 10 1 v cc = 0.9v, i cc 3.5ma sw 2 : d 0 D 0.3 v off current i 1 1 v cc = 0.9v, i eq = 100a v 2 0.7v, sw 3 : c, sw 8 : on 5 D D a boost switch on voltage v 1 1 v cc = 0.9v, i eq = 100a v 2 0.2v, sw 3 : d, sw 8 : on 0.6 D 0.9 v
ta8157af/afn 2002-10-30 8 test circuit 1 (*) tantalum condenser
ta8157af/afn 2002-10-30 9 test circuit 2 (*) tantalum condenser
ta8157af/afn 2002-10-30 10 characteristic curves unless otherwise specified: v cc = 1.2v, r l = 16 ? , r g = 600 ? , f = 1khz, ta = 25c
ta8157af/afn 2002-10-30 11
ta8157af/afn 2002-10-30 12
ta8157af/afn 2002-10-30 13 package dimensions weight: 0.32g (typ.)
ta8157af/afn 2002-10-30 14 package dimensions weight: 0.14g (typ.)
ta8157af/afn 2002-10-30 15 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. 000707eb a restrictions on product use

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