TA7792

TA7792 TGS | Alldatasheet

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SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC AM/FM 1 CHIP TUNER SYSTEM IC (1.5V USE) TA7792 GENERAL DESCRIPTION The TA7792 is AM/FM 1 chip tuner sy stem (FM FRONT END+AM/FM IF) ICs, which is designed for lo w vo ltage operation (1.5 V,3.0V). Those are especiall y suitable fo r stereo headphone radio and ra dio cassett e recorder equip ment s. These item can realize the low power dissipation and few external parts. FEA TURES z AM detector coil-less z FM mixer coil-less z Switchover between AM/FM m ode is possible with one-m ake switch. z Operating supply voltage range: Vcc(opr)=0.95~5V(T a=25°C) z Excellent low supply current (Vcc=1.5V , Ta=25°C) I cc(AM)=1.2mA(Typ.) I cc(FM)=4.0mA(Typ.) BLOCK DIAGRAM TIGER ELECTRONIC CO.,LTD

SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC PIN CONNECTION FM MIX SW FM OSC AM OSC AM MIX AM AGC AM IF AF FM DET Vcc GND FM IF2 AM RF FM IF1 GND FM RF D7792 AM/FM TERMINAL V OLTAGE: Term inal voltage at no signal with test circuit (Vcc=1.5V , Ta=25°C) Ty p. Typ. Pin No. Pin Nam e Sym - bol AM FM Unit Pin No. Pin Nam e Sym - bol AM FM Unit 1 FM RF OUT V1 - 1.5 V 9 FM DET V9 1.5 1.5 V 2 Vcc1 V2 - 1.5 V 10 Vcc2 V10 1.5 1.5 V 3 FM OSC V3 - 1.5 V 11 GND2 V1 1 0 0 V 4 AM OSC V4 1.5 1.5 V 12 FM IF IN V12 - 0.7 V 5 AM MIX OUT V5 1.5 1.5 V 13 AM RF IN V13 0.7 - V 6 AM AGC V6 0.8 - V 14 FM MIX OUT V14 - 0.8 V 7 AM IF IN V7 1.4 1.5 V 15 GND1 V15 0 0 V 8 AF OUT V8 0.6 0.6 V 16 FM RF IN V16 - 0.7 V MAXIMUM RA TINGS (T a=25°C) Characteristics Symbol Rating Unit Supply Voltage Vcc 5 V 750(DIP) Power Dissipation PD 350(SOP) mW Operating T emperature Topr -25~75 °C Storage T emperature Tstg -55~150 °C

SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC ELECTRICAL CHARACTERISTICS (Vcc=1.5V , Ta=25°C) Characteristics Sym- bol Test Cir- Cuit Test Condition Min. Typ. Max. Unit 1 FM: Vin=0 - 4.0 5.2 Supply Current Icc 1 AM: Vin=0 - 1.2 1.8 mA 1 FM:f=1kHz - 1.4 - Output Resistance Pin 8 Ro 1 AM: f=1kHz - 8.0 - kΩ AM: Vin=60dBµV EMF, f=1MHz, fm=1KHz, MOD=30% V oltage Gain Gv 1 Vin=30dBµV EMF 14 25 50 mVrms Recovered Output V oltage VOD 1 - 25 40 60 mVrms Total Harmonic Distortion THD 1 - - 1.5 - % Signal To Noise Ratio S/N 1 - - 40 - dB Oscillator Stop Supply V oltage Vstop 1 Vin<-20dBµV EMF - 0.85 0.95 V FM: Vin=60dBµV EMF, f=83MHz, fm=1kHz, Δf= ±22.5kHz Input Limiting V oltage Vin(lim) 1 -3dB limiting - 10 16 dBµV EMF Total Harmonic Distortion THD 1 - - 0.25 - % Signal To Noise Ratio S/N 1 - - 62 - dB Quiescent Sensitivity Qs 1 S/N=30dB - 12 - dBµV EMF AM Rejection Ratio AMR MOD=30% - 30 - dB Oscillator V oltage V osc 2 F=60MHz 53 90 135 mVrms Oscillator Stop Supply V oltage Vstop 1 Vin<-20dBµV EMF - 0.85 0.95 V Recovered Output V oltage VOD 1 - 28 45 68 mVrms

SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC TEST CIRCUIT TEST CIRCUIT 1 T EST CIRCUIT 2

SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC COIL DA TA（TEST CIRCUIT ） TURN COIL ST AGE TEST FREQUENCY L （µH ） Co (pF) Qo 1-2 2-3 1-3 4-6 WIRE (m mΦ) L1 FM RF 100MHz 0.053 - 100 - - 1.75 - 0.5UEW L2 FM OSC 100MHz 0.065 - 100 - - 2.25 - 0.5UEW T1 AM OSC 796kHz 288 - 115 13 73 - - 0.08UEW T2 AM IFT 455kHz - 180 120 - - 180 15 0.06UEW T3 FM DET 10.7MHz - 82 110 - - 13 - 0.12UEW APPLICA TION NOTE <FM SECTION> z RF am plifier (see Fig.1) This st age is co mposed o f th e e mitte r-grou nded and cascade connection am plifier . The input impedance of pin 16 is about 260 Ω, which is determ ined by D1. z Mixer am plifier (see Fig.2) The a mplified RF sig nal is t ran sfo rmed in to IF signal by the mixe r ci rc uit which is com posed of a dif ferential am plifier . The a mplified IF sig nal is app eared thro ugh the e mitte r follo we r ci rcuit at pin 14. The output im pedance of the ceram ic filter .

SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC (note) the spurio us ch aract eri stic is deter mined b y th e charact eristi c of the ce ra mic filte r (10 .7MHz ), be cause the mixe r co il is disp en sable. It i s po ssibl e to improve the spu riou s cha ract eri stic that t he t wo ce ra mic filte rs o f dif ferent characteristics are connected in series. z IF lim iter am plifier (see Fig.3) The IF li mite r amplifie r is co mposed of six emitte r-grounded a mplifie rs and a dif ferent ial a mpli fie r. The basis co mposi tio n of th e em itter -grou nd am pli fiers is shown as Fig.3 z Detector circuit This stage is co mposed of t he quadrat ure detect or circuit, which has double banlanced. <AM SECTION> z RF am plifier (see Fig.4) This stag e is co mposed of e mitte r-grounded am pli fier , t he input im pedance of wh ich h as about 7.3k Ω. It is ne cessary to connect as Fig.4, because the condenser , C1 i s available to the au dio by-pass o f the RF-AGC, the noise of low frequency . z Mixer circuit The a mplified RF sig nal is t ran sfor med in to IF signal by the mixer ci rcuit , which i s com posed of a dif ferential am plifier . z IF am plifier This stag e is co mposed o f fo ur e mitt er -ground ed am pl ifi ers and the two dif ferential am pli fiers. Th e in put i mped ance is rather high , because it is changed b y the a mpl it ude of inp ut signal (AGC leve l). So th e in put ter min al of the IF am plifier m ust be m atched with the im pedance of ceram ic filter .

SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC <COMMON SECTION> z AM/FM m ode switchover Switchover between AM/FM mode is possib le with on e-m ake swit ch. In case of the opened, this IC has AM m ode. Anothe r in ca se that the te rm inal i s connected to Vcc di rect ly , that ha s FM mode. And the term inal of pin 2 is Vcc term inal of FM FRONT END section, too. z Output circuit (see Fig.5) Both of th e AM/ FM detecto r si gnal is ap peare d through the pin 8. Those ou tput are cho sen by the mode switchover . At th e same ti me, the output i mpedance i s changed as follo w at AM/ FM mode, due to cut the AM carrier sign al and pass the FM co mposit e signal s moo thly , with only one condenser . D7792 8

8 TA7766AF

Rout (A M) =8k Ω (T yp.) Rout (FM) =1.4k Ω (T yp.) CHARACTERISTICS CUR VES

SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC

SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn CHMC Outline Draw ing DIP16 ： SOP16