TA7792

TIGER ELECTRONIC CO.,LTD AM/FM 1 CHIP T UNER SYSTEM IC (1.5V U SE) T A 7792 GENERAL DESCRIPTION The TA7792 is AM/FM 1 chip tuner system (FM FRONT END+AM/FM IF) ICs, w h i c h i s d e s i g n e d f o r l o w v o l t a g e o p e r a t i o n ( 1 . 5 V, 3 . 0 V ) . T h o s e a r e e s p e c i a l l y suitable for stereo headphone radio and radio cassette recorder equipments. These item can realize the low power dissipation and few external parts. F EAT URES AM detector coil-less FM mixer coil-less Switchover between AM/FM mode is possible with one-make switch. Operating supply voltage range: V c c ( o p r ) = 0 . 9 5 ~ 5 V ( Ta = 2 5 ° C ) E x c e l l e n t l o w s u p p l y c u r r e n t ( V c c = 1 . 5 V, T a = 2 5 ° C ) I c c ( A M ) = 1 . 2 m A ( Ty p . ) I c c ( F M ) = 4 . 0 m A ( Ty p . ) B LOCK DIAGRAM SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 1/9 CHMC Silicore P IN CONNECTION FM MIX AM/FM SW TA7792 D7792 1 2 3 4 5 6 7 8 16 15 14 13 FM RF GND FM IF1 AM RF FM IF2 GND Vcc FM DET FM OSC AM OSC AM MIX AM AGC AM IF AF TA7792 D7792 12 11 10 9 T ERMINAL V O LTAGE: T e r m i n a l v o l t a g e a t n o s i g n a l w i t h t e s t c i r c u i t ( V c c = 1 . 5 V, T a = 2 5 ° C ) Pin No. SymPin Name bol FM RF OUT V1 Vcc1 V2 FM OSC V3 AM OSC V4 AM MIX OUT V5 AM AGC V6 AM IF IN V7 AF OUT V8 Ty p . AM FM 1.5 1.5 1.5 1.5 1.5 1.5 1.5 0.8 1.4 1.5 0.6 0.6 Unit V V V V V V V V 9 10 11 12 13 14 15 16 Pin No. SymPin Name bol FM DET V9 Vcc2 V10 GND2 V 11 FM IF IN V12 AM RF IN V13 FM MIX OUT V14 GND1 V15 FM RF IN V16 Ty p . Unit AM FM 1.5 1.5 V 1.5 1.5 V 0 0 V 0.7 V 0.7 V 0.8 V 0 0 V 0.7 V 1 2 3 4 5 6 7 8 M AXIMUM RATINGS ( T a = 2 5 ° C ) Characteristics S u p p l y Vo l t a g e Power Dissipation O p e r a t i n g Te m p e r a t u r e S t o r a g e Te m p e r a t u r e Symbol Vcc PD To p r Ts t g Rating 5 750(DIP) 350(SOP) -25~75 -55~150 Unit V mW °C °C SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 2/9 CHMC Silicore E LECTRICAL CHARACTERISTICS ( V c c = 1 . 5 V, Ta = 2 5 ° C ) Characteristics Supply Current Output Resistance Pin 8 Symbol Icc Ro Te s t C i rCuit 1 1 1 1 1 1 1 1 Te s t C o n d i t i o n F M : Vi n = 0 A M : Vi n = 0 FM:f=1kHz AM: f=1kHz Vi n = 3 0 d B µ V E M F Min. 14 25 - TA7792 D7792 Ty p . M a x . 4.0 1.2 1.4 8.0 25 40 1.5 40 5.2 1.8 50 60 - Unit mA kΩ A M : Vi n = 6 0 d B µ V E M F, f = 1 M H z , f m = 1 K H z , M O D = 3 0 % Vo l t a g e G a i n Gv m Vr m s m Vr m s % dB V dBµV EMF % dB dBµV EMF dB R e c o v e r e d O u t p u t Vo l t a g e V O D To t a l H a r m o n i c THD Distortion S i g n a l To N o i s e R a t i o S/N O s c i l l a t o r St o p S u p p l y Vstop Vo l t a g e F M : Vi n = 6 0 d B µ V E M F, f = 8 3 M H z , I n p u t L i m i t i n g Vo l t a g e To t a l H a r m o n i c Distortion S i g n a l To N o i s e R a t i o Quiescent Sensitivity AM Rejection Ratio O s c i l l a t o r Vo l t a g e O s c i l l a t o r St o p S u p p l y Vo l t a g e Recovered Output Vo l t a g e Vi n ( l i m ) THD S/N Qs AMR Vo s c Vstop VOD 2 1 1 Vi n < - 2 0 d B µ V 1 EMF fm=1kHz, Δ f=±22.5kHz 1 1 1 1 -3dB limiting S/N=30dB MOD=30% F=60MHz Vi n < - 2 0 d B µ V EMF 53 28 0.85 0.95 10 0.25 62 12 30 90 0.85 45 16 - 1 3 5 m Vr m s 0.95 68 V m Vr m s SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 3/9 CHMC Silicore T EST C IRCUIT TA7792 D7792 TA7792 TEST CIRCUIT 1 TA7792 TEST CIRCUIT 2 SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 4/9 CHMC Silicore C OIL D ATA （ T E S T C I R C U I T ） C O I L S TA G E L1 FM RF L2 FM OSC T1 AM OSC T2 AM IFT T3 FM DET L TEST Co FREQUENCY （ µH） (pF) 100MHz 100MHz 796kHz 455kHz 10.7MHz 0.053 0.065 288 180 82 Qo 100 100 11 5 120 11 0 TURN 1-2 13 2-3 73 1-3 1.75 2.25 180 13 4-6 15 - TD7792 A7792 WIRE (mmΦ) 0.5UEW 0.5UEW 0.08UEW 0.06UEW 0.12UEW A PPLICAT ION NOTE RF amplifier (see Fig.1) This stage is co mposed of the emitter-grounded a n d c a s c a d e c o n n e c t i o n a m p l i f i e r. The input impedance of pin 16 is about 260Ω, which is determined by D1. Mixer amplifier (see Fig.2) The amplified RF signal is transformed into IF signal by the mixer circuit which is c o m p o s e d o f a d i f f e r e n t i a l a m p l i f i e r. The amplified IF signal is appeared through the emitter follower circuit at pin 14. The o u t p u t i m p e d a n c e o f t h e c e r a m i c f i l t e r. SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 5/9 CHMC Silicore (note) TA7792 D7792 the spurious characteristic is determined by the characteristic of the ceramic filter (10.7MHz), because the mixer coil is dispensable. It is possible to improve the spurious characteristic that the two ceramic filters of different characteristics are connected in series. IF limiter amplifier (see Fig.3) The IF limiter amplifier is composed of six e m i t t e r - g r o u n d e d a m p l i f i e r s a n d a d i f f e r e n t i a l a m p l i f i e r. The basis composition of the emitter-ground amplifiers is shown as Fig.3 Detector circuit This stage is composed of the quadrature detector circuit, which has double banlanced. RF amplifier (see Fig.4) This stage is co mposed of e mitter-grounded a m p l i f i e r, t h e i n p u t i m p e d a n c e o f w h i c h h a s about 7.3kΩ. It is necessary to connect as Fig.4, because to the the c o n d e n s e r, by-pass C1 of is the available audio R F - A G C , t h e n o i s e o f l o w f r e q u e n c y. Mixer circuit The amplified RF signal is transformed into IF signal by the mixer circuit, which is c o m p o s e d o f a d i f f e r e n t i a l a m p l i f i e r. IF amplifier This stage is co mposed of four e mitter-grounded amplifiers and the two differential amplifiers. The input impedance is rather high, because it is changed by the amplitude of input signal (AGC level). So the input terminal of t h e I F a m p l i f i e r m u s t b e m a t c h e d w i t h t h e i m p e d a n c e o f c e r a m i c f i l t e r. SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 6/9 CHMC Silicore AM/FM mode switchover TA7792 D7792 Switchover between AM/FM mode is possible with one-make switch. In case of the opened, this IC has AM mode. A n o t h e r i n c a s e t h a t t h e t e r m i n a l i s c o n n e c t e d t o V c c d i r e c t l y, t h a t h a s F M mode. And the terminal of pin 2 is Vcc terminal of FM FRONT END section, too. Output circuit (see Fig.5) Both of the AM/FM detector signal is appeared through the pin 8. T h o s e o u t p u t a r e c h o s e n b y t h e m o d e s w i t c h o v e r. TA7792 D7792 8 C1 C2 560pF 8 TA7766AF At the same time, the output impedance is changed as follow at AM/FM mode, d u e t o c u t t h e A M c a r r i e r s i g n a l a n d p a s s t h e F M c o m p o s i t e s i g n a l s m o o t h l y, w i t h o n l y o n e c o n d e n s e r. R o u t ( A M ) = 8 k Ω ( Ty p . ) R o u t ( F M ) = 1 . 4 k Ω ( Ty p . ) C HARACTERISTICS CUR VES SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 7/9 CHMC Silicore TA7792 D7792 SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 8/9 CHMC Silicore Outline Drawing D IP16 ： TA7792 D7792 TA7792 S OP16 TA7792 SHAOXING SILICORE TECHNOLOGY CO.,LTD www. Silicore. com. cn 9/9 CHMC