page 1 of 6 1. overview the hc 1062(high level mute) / hc 1062a (low level mute) are integrated circuit that perform all speech and line interface functions required in fully electronic telephone sets. they also perform electronic switching between dialing and speech. the ics operate at line voltage down to 1.6v (with reduce performance) to facilitate the use of more telephone sets connected in parallel. low line voltage down to 1.6v (excluding polarity guard) voltage regulator with adjustable static resistance provides a supply for external circuit symmetrical high-impedance inputs (64k ) for dynamic, magnetic or piezoelectric microphone asymmetrical high-impedance (32k ) for electret microphone dtmf signal input with confidence tone mute input for pulse or dtmf dialing receiving amplifier for dynamic, magnetic or piezoelectric earpieces large gain range settings for microphone and earpieces amplifiers line loss compensation (line current dependent) for microphone and earpiece amplifier gain control curve adaptable for exchange supply dc line voltage adjustment facility db reference control current low voltage reference 10 7 6 11 12 13 9 14 15 8 16 2 4 5 1 3 low voltage telephone speech transmission circuit (high level mute) hc1062 lo w vo lta g e tele p hone s p eech transmission circuit ( lo w lev e l mute ) HC1062A hsin semiconductor pte ltd www.hsin.com.s g
page 2 of 6 2. 2 pin description pin no. symbol description pin no. symbol description 1 ln + positive line 9 ln - negative line 2 adj mic1 gain adjustment, transmitting amp 10 in r receiving input 3 adj mic2 gain adjustment, transmitting amp 11 in dtmf dtmf input 4 out r receiving output 12 in mutr mute input 5 adj r gain adjustment, receiving amp 13 v cc supply voltage 6 in - mic inverting microphone input 14 reg de-coupling 7 in + mic non-inverting microphone input 15 in agc agc input 8 cs current stabilizer 16 adj sl slope adjustment 3. electrical characteristics 3. 1 absolute maximum ratings unless otherwise specified, t amb = 25 parameter symbol conditions value unit continuous line voltage v ln 12 v repetitive line voltage v ln during switch on or interruption 13.2 v repetitive peak line voltage v ln r 9 =20 ,r 10 =13 tp/p=1ms/5s 28 v line current i lins r 9 =20 140 ma input voltage of all pins v pins v cc +0.7/-0.7 v power dissipation p d r 9 =20 666 mw junction temperature t j 125 operating temperature t amb -25 ~ 75 storage temperature t stg -40 ~ 125 3. 2 electrical characteristics unless otherwise specified, t amb = 25 , i line =11~140ma, v 9 =0v, f=800h z va l u e parameter symbol test conditions min typ max unit supplies ln and v cc pin 1 and 13 i line =1ma 1.6 v i line =4ma 1.9 v i line =15ma 3.55 4.0 4.25 v i line =100ma 4.9 5.7 6.5 v line voltage when mic input open v ln i line =140ma 7.5 v variation with temperature v ln / t i line =15ma 0.3 mv/k r av =68k (ln to reg) 3.5 v v ln with external resistor v ln r av =68k (reg to slpe) 4.5 v supply current i cc v cc =2.8v 0.9 1.35 ma v cc i p =1.2ma 2.2 2.7 v supply for external circuit v cc i p =0ma 3.4 v
page 3 of 6 va l u e parameter symbol test conditions min typ max unit microphone input input impedance differential z i between pin 6 and 7 64 k input impedance single z i between pin 6 ( or 7) and 9 32 k common mode rejection cmr 82 db voltage gain a v between pin 6 ( or 7) and 1 i line =15ma, r 7 =68 k 50.5 52 53.5 db gain variation with frequency a vf f=300 ~ 3400hz w.r.t.800hz + 0.2 db gain variation with temperature a vt t amb = -25 ~ 75 w.r.t. 25 , i line =50ma + 0.2 db transmitting gain variation a v adjust r7 between pin 2 and 3 -8 0 v i line =15ma thd=10% 1.7 2.3 v transmitting amp output voltage v ln i line =4ma thd=10% 0.8 v output noise voltage v ln i line =15ma, r 7 =68 k 200 between pin 6 and 7 0.27 mv dtmf input impedance z i pin 11 20.7 k voltage gain from dtmf to ln a v i line =15ma r 7 =68 k 24.0 25.5 27.0 db gain variation with frequency a vf f=300~3400hz w.r.t.800hz + 0.2 db gain variation with temperature a vt t amb =-25~75 w.r.t. 25 , i line =50ma + 0.2 db receiver input impedance z i pin 10 21 k input impedance z o pin 4 4 voltage gain a v i line =15ma, r l =300 29.5 31 32.5 db gain variation with frequency a vf f=300~3400hz w.r.t.800hz + 0.2 db gain variation with temperature a vt t amb =-25~75 ,without r 6 w.r.t. 25 i line =50ma + 0.2 db output voltage r l =150 0.22 0.33 v output voltage r l =450 v o thd=2%, i p =0ma sine wave drive r 4 =100k , i line =50ma 0.30 0.48 v output voltage v o thd=10%, r 4 =100k i line =4ma, r l =150 15 mv output noise voltage v no pin 10 open circuit r 4 =100k i line =15ma, r l =300 50 uv gain variation with r4 a v between pin 4 and 5 -11 0 db
page 4 of 6 va l u e parameter symbol test conditions min typ max unit mute high level input voltage v ih pin 12 1.5 v cc v low level input voltage v il pin 12 0.3 v input current i mute pin 12 8 15 ua gain attenuation a v from pin 6 (or 7) to pin 1 70 db voltage gain a v from pin 11 to pin 4 r 4 =100k , r l =300 -19 db agc agc control range a v from pin 10 to pin 4 r 4 =110k , i line =70ma -5.8 db agc control range a v from pin 6 (or 7) to pin 1 r 4 =110k , i line =70ma -5.8 db max. line current i linem highest gain 23 ma max. line current i linem lowest gain 61 ma 4. test circui k1 + 10uf + 10uf + 100uf c1 k4 4.7uf c3 220k r6 3.6k r5 20 r9 68k r3 100k r4 450 150 rl 600 rl 620 r1 + 100uf + 10uf c2 100pf c4 1000pf c7 1000pf c8 k5 k6 k7 k3 k2-1 g g 100pf c3 10 7 6 11 12 13 1 914 15 8 16 3 2 5 4 hc1062/a g 10 140ma k2-1
page 5 of 6 5. characteristics curve
page 6 of 6 6. application circuit 7. package dimensions 10 4 5 7 6 16 2 3 14 15 8 9 12 11 13 1 100nf c5 100pf c4 c2 1nf c7 100pf c6 4.7uf c3 100uf c1 d5 1nf c8 telephone from dial and control circuit 13 r10 3.92k r3 r6 3.6k r5 20 r9 zbal 390 r8 620 r1 130k r2 rva(14-16) r4 hc1062/a d1 d2 d3 d4 line
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