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TA8155F / fn 2002-10-30 1 toshiba bipolar linear integrated circuit silicon monolithic TA8155F,TA8155Fn rec / pb system dual pre ? amplifier (1.5 / 3v use) the TA8155F and TA8155Fn are rec / pb system dual pre amplifier ics, which are developed for low voltage operation (1.5 / 3v use). these are especially suitable for a stereo headphone cassette player. features built ? in dual playback amplifiers. input coupling condenser ? less. built ? in capacitor for buzz noise. built ? in dual buffer amplifiers. for radio signal inut. monitor for rec mode. built ? in dual microphone amplifiers. built ? in an alc circuit for mic ? rec mode. attack time. : 0.1s (typ.) recovery time. : 3.5s (typ.) built ? in dual recording amplifiers. single ? end output type. built ? in a power switch. low quiescent current. (v cc = 1.2v, ta = 25c) pb mode .................... i ccq2 = 2.6ma (typ.) radio mode ............. i ccq3 = 2.4ma (typ.) radio ? rec mode ... i ccq4 = 3.0ma (typ.) mic ? rec mode ........ i ccq5 = 4.5ma (typ.) low power dissipation. pb mode : 2.9mw (typ.) mic ? rec mode : 8.9mw (typ.) operating supply voltage range. (ta = 25c) v cc (opr) = 0.9~4v v cc (opr) (rec) = 1.8~4v weigh ssop24-p-300-1.00: 0.32g (typ.) ssop24-p-300-0.65a: 0.14g (typ.)
TA8155F / fn 2002-10-30 2 block diagram
TA8155F / fn 2002-10-30 3 terminal explanation terminal voltage : typical terminal voltage at no signal with test circuit. (v cc = 1.2v, v cc (rec) = 2.4v, ta = 25c) terminal no. name function internal circuit terminal voltage (v) 1 v cc(rec) this terminal voltage supplies output stage of recording amplifier with power source. 2.4 2 rec out b 3 rec out a output of recording amplifier. 1.15 4 pb in b 5 pb in a input of playback amplifier. 0.85 7 pb nf b 10 pb nf a nf of playback amplifier. 0.85 6 v ref reference voltage. all amplifier operate on this voltage. 0.85 8 pb out b 9 pb out a output of playback amplifier and buffer amplifier. 0.55 11 rec sw rec / pb switch. v cc : rec mode. gnd / open: pb mode. D 12 pw sw power switch. v cc : power on. gnd / open: power off. D 15 line sw line switch. vcc: buf (radio) mode. gnd / open: tape mode. D
TA8155F / fn 2002-10-30 4 terminal no. name function internal circuit terminal voltage (v) 13 buf in a 14 buf in b input of buffer amplifier and recording amplifier. (buffer amplifier is inverter type.) alc level of microphone amplifier is determined by signal level of this terminal 0.85 16 mic out b 17 mic out a output of microphone amplifier. 0.55 18 mic nf a 22 mic nf b nf of microphone amplifier. 0.05 19 mic in a 21 mic in b input of microphone amplifier. built in capacitor for buzz noise. 0.01 20 gnd D D 0 23 v cc D D 1.2 24 alc alc terminal. alc function is operated in only mic rec mode. 0.11
TA8155F / fn 2002-10-30 5 application note (1) pw sw it is necessary to connect an external pull down resistor with the terminal pw sw (pin(12)), in case that this ic is turned on due to external noise etc. (2) mode sw table.1 ic mode ic mode is determined by switch condition of red sw (pin(11)) and line sw (pin(15)) (table.1) h level: bias current should be applied to switch terminal more than 5a. l level: bias voltage should be applied to switch terminal from 0v to 0.3v. the leak current flows through the terminal of rec sw (pin(11)) or line sw (pin(15)), in case that the terminals connected with v cc line independently, even though this ic is off mode (the terminal of pw sw (pin(12)) is off mode). and it is necessary to connect an external pull down resistor with the terminal rec sw (pin(11)) and line sw (pin(15)), in case that this ic is turned on due to external noise etc. (3) playback amplifier output voltage of playback amplifier is determined by an external resistor r 1 and r f . v o (pre) = v ref ? v r f b(nf) i 1 r v ? v is an off set voltage which is designed to 18mv. in case that of transistor is assumed 100, i b(nf) is flowed 0.2a in fig.1. and output voltage of playback amplifier (pin (8),(9)) in fig.1 is v o (pre) = 0.85v 0.018v (330k ? +13k ? ) x 0.56(v) a 0.2 - 18k 0.018v output voltage of playback amplifier should be fixed v cc / 2, because playback amplifier get a enough dynamic range. and current source of 20a is operated except playback mode, in order to reduce a pop sound in swichover between playback on / off mode (fig.2). rec sw line sw l h l pb mode (pb) mic rec (buf,mic,rec) h radio mode (buf) radio rec mode (buf,rec) ( ) : operating amplifier. fig.1 dc output voltage of playback amplifier.
TA8155F / fn 2002-10-30 6 (4) microphone amplifier current source of 5.5a is operated except mic rec mode, because bias is applied to the same output voltage as output voltage of microphone amplifier in operation (fig.3). (5) v cc (rec) the v cc (rec) terminal (pin(1)) is applied bias to v cc (rec) = v cc 0.7v, because the v cc (rec) terminal (pin(1)) is connected with the v cc terminal (pin(23)) by diode, as internal circuit of termial explanation. and supply current doesn't flow through v cc (rec) terminal (pin(1)), in case that the terminal is connectd with v cc line, even though this ic is on mode and except rec mode. maximum ratings (ta = 25c) characteristic symbol rating unit v cc 4.5 supply voltage v cc (rec) 4.5 v TA8155F 400 power dissipation TA8155Fn p d (note) 500 mw operating temperature t opr 25~75 c storage temperature t stg ? 55~150 c (note) derated above ta = 25c in the proportion of 3.2mw / c for TA8155F, and of 4mw / c for TA8155Fn. fig.2 reducing a pop sound of mode switchover (1). fig.3 reducing a pop sound of mode switchover (2).
TA8155F / fn 2002-10-30 7 electrical characteristics u nless otherwise specified: v cc = 1.2v, v cc(rec) = 2.4v, f = 1khz, ta = 25c, sw 1 : a, sw 8 : open, sw 9 : on, sw 10 : on, sw 11 : on, sw 2 ~sw 7 condition by next page characteristic symbol test cir ? cuit test condition min. typ. max. unit pw off i ccq1 sw 1 : b, sw 2 : b, sw 3 : b D 0.1 5 a pb i ccq2 sw 2 : b, sw 3 : b D 2.6 3.9 radio i ccq3 sw 2 : b, sw 3 : a D 2.4 3.6 radio rec i ccq4 sw 2 : a, sw 3 : a D 3.0 4.5 mic rec i ccq5 sw 2 : a, sw 3 : b D 4.5 6.5 quiescent current v cc (rec) i ccq6 D sw 2 : a, sw 3 : b 1.3 1.5 2.4 ma reference voltage v ref D 0.8 0.85 0.9 v open loop voltage gain g vo D sw 8 : on, sw 9 : open v o = 17dbv 58 70 D closed loop voltage gain g vc D v o = 17dbv D 36 D db maximum output voltage v om1 D thd = 1% 200 310 D mv rms total harmonic distortion thd1 D v o = 17dbv D 0.1 0.3 % equivalent input noise voltage v ni D sw 4 : open bpf = 30hz~20khz nab (g v = 36db,f = 1khz) D 1.2 3.0 v rms cross talk (ch a / ch b) ct1 D v o = 17dbv D 62 D playback amplifier ripple rejection ratio rr1 D sw 4 : open, sw 10 : open f r = 100hz, v r = 32dbv D 40 D db voltage gain g v2 D v o = 17dbv 4 2 0 db maximum output voltage v om2 D thd = 1% 200 270 D mv rms total harmonic distortion thd2 D v o = 17dbv D 0.1 D % output noise voltage v no2 D sw 5 : b, bpf = 30hz~20khz D 35 D v rms cross talk (ch a / ch b) ct2 D v o = 17dbv D 51 D buffer amplifier ripple rejection ratio rr2 D sw 5 : b, sw 10 : open f r = 100hz,v r = 32dbv D 55 D db voltage gain g v3 D v o = 12dbv 16.5 18.5 20.5 db maximum output voltage v om3 D thd = 1% 500 720 D mv rms total harmonic distortion thd3 D v o = 12dbv D 0.1 0.5 % output noise voltage v no3 D sw 5 : b, bpf = 30hz~20khz D 0.09 0.25 mv rms cross talk (ch a / ch b) ct3 D v o = 12dbv D 49 D recording amplifier ripple rejection ratio rr3 D sw 5 : b, sw 10 : open f r = 100hz, v r = 32dbv D 40 D db
TA8155F / fn 2002-10-30 8 characteristic symbol test cir cuit test condition min. typ. max. unit voltage gain g v4 D v o = 17dbv 30 32.5 35 db maximum output voltage v om4 D thd = 1% 120 200 D mv rms total harmonic distortion thd4 D v o = 17dbv D 0.25 0.8 % output noise voltage v no4 D sw 6 : a, bpf = 30hz~20khz D 0.12 D mv rms cross talk (ch a / ch b) ct4 D v o = 17dbv D 52 D microphone amplifier ripple rejection ratio rr4 D sw 6 : a, sw 10 : open f r = 100hz,v r = 32dbv D 36 D db voltage gain g v5 D sw 7 : on, v o = 17dbv D 58 D db maximum output voltage v om5 D thd = 3% 600 800 D mv rms alc total harmonic distortion thd5 D v in = 32dbv D 0.8 D % output noise voltage v no5 D sw 6 : a, bpf = 30hz~20khz D 2.1 3.5 mv rms v oalc1 D v in = 62dbv 11.7 8.5 6.7 alc voltage v oalc2 D 11.7 8.5 6.7 dbv alc channel balance cb alc D v in = 32dbv D 0 1.5 alc width w alc D v oalc 3db (input voltage) with respect to standard v in = 42dbv D 48 D db cross talk (ch a / ch b) ct5 D v in = 32dbv D 37 D microphone amplifier + recording amplifier ripple rejection ratio rr5 D sw 6 : a, f r = 100hz, v r = 17dbv D 39 D db power on current i 12 D sw 1 : c, sw 2 : b, sw 3 : b v 6 0.6v 5 D D a power switch power off voltage v 12 D sw 1 : d, sw 2 : b, sw 3 : b v 6 0.2v 0 D 0.3 v switch condition for test mode (unless otherwise specified.) mode pb amp. (pb mode) buf amp. (radio mode) rec amp. (radio rec mode) mic amp. (mic mode) mic amp. + rec amp. (mic rec mode) operating amplifier switch pb buf buf rec mic alc buf, rec sw 2 b b a a sw 3 b a a b sw 4 on open open open sw 5 b a a b c sw 6 a a a b sw 7 open open open on open
TA8155F / fn 2002-10-30 9 test circuit (*) rr5 is measured by circuit below (for v cc line)
TA8155F / fn 2002-10-30 10 characteristic curves unless otherwise specified v cc = 1.2v, v cc(rec) = 2.4v, f = 1khz, ta = 25c r l = 10k ? : pb amp., buf amp., mic amp. (load of recoading amplifier is shown in test circuit)
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TA8155F / fn 2002-10-30 13
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TA8155F / fn 2002-10-30 15 package dimensions weight: 0.32g (typ.)
TA8155F / fn 2002-10-30 16 package dimensions weight: 0.14g (typ.)
TA8155F / fn 2002-10-30 17 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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