features ? operating supply voltage 1.1 to 1.55 vdc ? 40 db feedback stabilized gain ? 38 db gain trim ? 0.95 regulated voltage LC506 ? 0.90 regulated voltage lv506 2( 2 ) _ + 230 30k 1( 1 ) 5( 7 ) 6( 8 ) 4( 6 ) 3( 3 ) regulator v reg v b input output gain set gnd block diagram linear class a preamplifiers LC506/lv506 data sheet description the LC506 and lv506 are class a non-inverting preamplifiers with 40 db feedback controlled, stabilized gain. gain trim is provided at pin 1, which simultaneously affects both gain and output noise, independent of the main volume control. a voltage regulator is built on-chip to supply the amplifier and electret microphone with precision reference voltage. a typical regulator voltage for the LC506 is 0.95v, while it is 0.90v for the lv506. this regulator feature of the LC506 allows it to be used with the high power ld549 to provide increased supply rejection during transient drops in supply voltage, caused by high current peaks in the ld549. both LC506 and lv 506 devices are capable of operating from a supply voltage of 1.55 vdc while continuously providing 80 db of regulator supply rejection. bracketed pin-out for LC506
standard packaging ? 8 pin micropac (LC506) ? 8 pin minipac (LC506) ? 8 pin plid ? (LC506) ? 6 pin minipac (lv506) revision date: january 1996 gennum corporation p.o. box 489, stn a, burlington, ontario, canada l7r 3y3 tel. (905) 632-2996 fax: (905) 632-5946 japan branch: a-302, m i yamae villa ge, 2C10C42 m i yamae, suginami Cku tokyo 168, japan tel. (03) 3334-7700 fax (03) 3247-8839 document no. 500 - 26 - 05
500 - 26 - 05 2 electrical characteristics conditions : v b = 1.30 vdc , temperature 25?c 2(2) 230 30k 1(1) 5(7) 6(8) 4(6) 3(3) v b =1.3 vdc 0.1 v out 47 10 10 k + 0.1 3.3 k 4.7 k 33 k + 10 v in
1 khz r b =4.7 regulator _ + parameter symbol conditions min typ max units gain a v v out = 0.25v rms (note 1) temperature coefficient of gain quiescent current (incl. microphone simulator circuit) temperature coefficient of current microphone supply voltage LC506 lv506 input referred noise total harmonic distortion and noise v out = 0.25 v rms maximum output at 7% thd input impedance output impedance frequency response high (-3db) low (-3db) parameter value / units supply voltage 3 vdc power dissipation 60 mw storage temperature -20 to + 70 ? c operating temperature -10 to + 60 ? c absolute maximum ratings pin connection 1 4 5 8 8 pin 1 3 4 6 i / p gnd 6 pin 38 - 182 - 0.90 0.85 - - - - - - - 41 0.03 300 44 - 362 db db/?c m a -2.0 0.95 0.90 1.2 1.5 350 30 2.5 5 0.2 - 1.00 0.95 2.0 3.8 - - - - - m a/?c v v m v % mv rms k w k w khz khz caution class 1 esd sensitivity i/p n/c v reg v reg gain set v b o/p gain set microphone simulator circuit bracketed pin-out for LC506 all external resistors in ohms, all capacitors in m f unless otherwise stated fig. 1 test circuit note 1: a v = 20 log (vout/ v in ) + 40 db where 40 db is input attenuator all parameters and switches remain as shown in test circuit unless stated in conditions column. gnd v b n/c o/p
500 - 26 - 05 3 10k 1k 100 30 40 50 1k 100 10k 20 0 40 60 r gt ( w ) frequency (hz) 1.1 38 40 1.0 1.2 1.3 1.4 1.5 v b (v) 39 41 60 40 20 10 0 -20 t a ( o c) -20 0 20 40 t a ( o c) 0.8 60 1.2 1.0 -20 0 20 40 t a ( o c) 250 350 450 60 fig. 2 frequency response fig.3 gain vs gain trim resistor fig. 4 voltage gain vs battery voltage fig. 5 gain vs temperature fig. 7 quiescent current vs temperature fig. 6 regulating voltage vs temperature device characteristics gain (db) gain (db) gain (db) gain (db) regulating voltage (v) quiescent current ( m a)
500 - 26 - 05 4 2 470
typ 0.047 1 5 6 4 3 v b =1.3 vdc 6.8 n/c 8 0.1 6.8 2.2 6.8 7 lc/ld549 r gt
10k 0.01 2 1 5 6 4 3 r vc =10k LC506 + mic fig. 10 typical application circuit all resistors in ohms, all capacitors in m f unless otherwise stated fig. 9 equivalent circuit all resistors in ohms, all capacitors in m f unless otherwise stated note : use ld549 with lv506 v b (v) 250 350 450 1.1 1.0 1.2 1.3 1.4 1.5 fig. 8 quiescent current vs battery voltage output ground 230 30k v reg
input v b 30k gain trim gennum corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. ? copyright sept. 1982 gennum corporation. revision date: november 1991 all rights reserved. printed in canada. revision notes chip information removed. quiescent current ( m a)
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