AN7208

ICs for FM/AM Tuner AN7208SA TV/FM front-end IC for 1.5 V headphone stereo s Overview The AN7208SA is a TV/ FM front-end IC developed for use in the headphone stereo. It incorporates two systems of FM and VHF band front-end. A pre-amp. between IF amp. is not necessary by combination with the AN7233SH. 6.5±0.3 20 11 Unit : mm s Features • Built-in two system of FM and VHF band front-end • Pre-amp. between IF amp. is not necessary (combination with the AN7233SH) • Built-in standby /IF gain control/local oscillator buffer circuits 1 10 4.3±0.3 6.3±0.3 (0.50) 0.65±0.10 1.5±0.2 0.65±0.10 0.1±0.1 (0.33) 0.65 0.25±0.10 Seating plane 0.15 − 0.05 +0.10 Seating plane s Applications • 1.5 V headphone stereo (VCC 1.0 V to 2.0 V) SSOP020-P-0225A s Block Diagram 20 19 18 17 16 15 14 13 12 11 Power 10 1 FM mix. FM OSC OSC buffer TV OSC FM RF 1 2 TV RF 3 TV mix. 4 1st IF amp. 5 6 2nd IF amp. 7 8 9 AN7208SA s Pin Descriptions Pin No. 1 2 3 4 5 6 7 8 9 10 Description FM RF input TV RF input GND 1 N.C. IF out 1 Mode SW IF in IF gain control IF out 2 GND 2 Pin No. 11 12 13 14 15 16 17 18 19 20 VCC2 STDBY TV OSC 1 TV OSC 2 OSC buff. FM OSC 1 FM OSC 2 TV RF FM RF VCC1 ICs for FM/AM Tuner Description s Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation Operating ambient temperature Storage temperature *1 *1 Symbol VCC ICC PD Topr Tstg Rating 2.5 12 30 −20 to +75 −55 to +125 Unit V mA mW °C °C Note) *1 : All items are at Ta = 25°C, except for the operating ambient temperature and storage temperature. s Recommended Operating Range Parameter Supply voltage Symbol VCC Range 1.0 to 2.0 Unit V s Electrical Characteristics at VCC = 1.2 V, Ta = 25°C Parameter TV fIN = 221.75 MHz Conversion gain *1 Oscillation voltage S/N *2 Symbol Conditions Min Typ Max Unit GCONV(TV) fOUT = 10.6 MHz VOSC(TV) S/N(TV) ITOT(TV) VBUF(TV) VCC = 0.95 V Input level = 60 dBµ 1 kHz 30% Mod.        VCC = 0.95 V 30 15 41  39 38 27 44 8.8 62 46   12  dB mV[rms] dB mA mV[rms] Quiescent current Oscillation buffer output Note) Tuning is taken the peak point at 10.6 MHz output level ( VIN = 30 dBµ, non-modulation) *1 : Conversion gain = 20 Log( ∆V (µV) ÷ 31.6) ∆V is the output difference at VIN = 30 dBµ and at VIN = 36 dBµ *2 : Measurement is done at the detection output of the AN7233 Measure the ratio of output at fDIV = 22.5 kHz to that at fDIV = 0 Hz (modulation freq. 1 kHz) 2 ICs for FM/AM Tuner s Electrical Characteristics at VCC = 1.2 V, Ta = 25°C (continued) Parameter TV fIN = 221.75 MHz (continued) Burst noise *3 FM fIN = 107.88 MHz Conversion gain *1 Oscillation voltage S/N *2 AN7208SA Symbol Conditions Input level = 60 dBµ Non-modulation Min −1.8 Typ  Max Unit VNO(TV) 1.8 mV[p-0] GCONV(FM) fOUT = 10.6 MHz VOSC(FM) S/N(FM) ITOT(FM) VBUF(FM) VNO(FM) VCC = 0.95 V Input level = 60 dBµ Non-modulation VCC = 0.95 V Input level = 60 dBµ 1 kHz 30% mod.  30 40 48  66 −1.8 38 63 51 7.7 132  46   10  1.8 dB mV[rms] dB mA mV[rms] mV[p-0] Quiescent current Oscillation buffer output Burst noise *3 Note) Tuning is taken the peak point at 10.6 MHz output level ( VIN = 30 dBµ, non-modulation) *1 : Conversion gain = 20 Log( ∆V (µV) ÷ 31.6) ∆V is the output difference at VIN = 30 dBµ and at VIN = 36 dBµ *2 : Measurement is done at the detection output of the AN7233 Measure the ratio of output at fDIV = 22.5 kHz to that at fDIV = 0 Hz (modulation freq. 1 kHz) *3 : Measurement is done at the detection output of the AN7233 Measures a peak voltage of the measurement time = within 500 ms (OK to 10 times) s Terminal Equivalent Circuits Pin No. 1 19 Equivalent circuit Description FM RF input To mix. Input resistance or pin voltage Approx. VCC − 0.7 V RF signal input in FM band (Common base type) 1 2 18 TV RF input To mix. Approx. VCC − 0.7 V RF signal input in TV band (Common base type) 2 3 AN7208SA s Terminal Equivalent Circuits (continued) Pin No. 3 Equivalent circuit  GND 1 GND pin (RF, mix. block) 4 5  N.C. IF out 1 Outputs IF signal of TV/FM Description ICs for FM/AM Tuner Input resistance or pin voltage   Approx. 330 Ω Approx. VCC − 0.7 V 5 6 VCC Mode SW Switch of band switching VCC : TV mode Open/GND : FM mode  6 7 IF in IF amp. block input Approx. 5 kΩ 7 4 ICs for FM/AM Tuner s Terminal Equivalent Circuits (continued) Pin No. 8 Equivalent circuit Description IF gain control AN7208SA Input resistance or pin voltage Approx. 700 Ω Approx. 0.7 V IF amp. block gain can be decreased 8 by inserting a resistance to GND. 9 IF out 2 IF amp. block output Approx. 330 Ω Approx. VCC − 0.7 V 9 10  GND GND pin (IF, OSC block)  11  VCC2 Power supply pin (IF, OSC block)  12 STDBY Standby switch VCC /open : IC off GND : IC operates  12 5 AN7208SA s Terminal Equivalent Circuits (continued) Pin No. 13 Equivalent circuit Description TV OSC 1 ICs for FM/AM Tuner Input resistance or pin voltage Approx. 10 kΩ Approx. VCC Connects a local oscillator coil of 13 14 TV band VCC 14 TV OSC 2 Connects a local oscillator coil of 13 14 Approx. 10 kΩ Approx. VCC TV band VCC 15 OSC buff. Oscillator buffer output pin 15 Approx. 150 Ω Approx. VCC − 0.2 V 16 FM OSC 1 Connects a local oscillator coil of 16 17 Approx. 10 kΩ Approx. VCC FM band VCC 6 ICs for FM/AM Tuner s Terminal Equivalent Circuits (continued) Pin No. 17 Equivalent circuit Description FM OSC 2 Connects a local oscillator coil of 16 17 AN7208SA Input resistance or pin voltage Approx. 10 kΩ Approx. VCC VCC FM band 18 18 TV RF To mix.  Connects an RF tuning coil of TV band 2 19 19 FM RF To mix.  Connects an RF tuning coil of FM band 1 20  VCC1 Power supply pin (RF, mix.block)  7 AN7208SA s Application Circuit Example VCC1(1.2 V/0.98 V) 0.047 µF 0.047 µF 0.022 µF 15 ICs for FM/AM Tuner AN7233SH ET IF req. 14 50 Ω VCC2(1.5 V) 16 AM D IF out 13 12 11 X1 220 Ω 0.01 µF 100 µF Out 17 18 5.1 kΩ 15 V 1 µF 1 µF 0.022 µF AM AF in GND Det. out Quad 19 MPX in 20 21 R-ch. L-ch. Band PLL 1 VCC 10 SD 9 ST. Mute FMIF in 8 7 6 5 4 3 2 S/N Measurement Others CF2 22 µF 330 Ω 51 kΩ 50 Ω 100 µF 100 µF 10 kΩ 0.1 µF 1 kΩ 680 pF 0.1 µF 10 kΩ 22 23 24 25 26 VOSC(TV) 1 000 pF 1 000 pF 100 Ω 4.7 kΩ 50 Ω 2SC3935 3 pF 15 kΩ PLL 2 AMIF in VCO AM AGC LPF 1 VCC 330 pF 1 µF 27 28 LPF 2 AM mix. 1 AM OSC AM in 56 pF 470 kΩ 470 kΩ 0.001 pF 470 kΩ VOSC(FM) 1 000 pF 100 Ω 4.7 kΩ 1 000 pF 2SC3935 5 pF L4 D4 0.022 pF 10 Ω 1 000 pF 56 pF 470 kΩ 470kΩ 470 kΩ 390 pF L2 47 pF 20 pF 470 kΩ D2 390 pF D3 L3 0.001 µF 100 Ω 4.7 kΩ 2SC3935 1 000 pF AN7208SA 11 V 12 13 14 TV OSC 15 CC2 GND 2 10 IF out 9 0.001 µF 0.01 µF 56 kΩ CF1 TV FM STDBY IF gain 8 IF in 7 6 5 470 kΩ 16 L1 270 pF 0.001 µF 20 pF 470 kΩ D1 17 18 19 10 Ω 470 kΩ 20 OSC buff. TV/FM IF out FM OSC TV RF FM RF VCC1 N.C. 4 GND1 TV in FM in 3 2 1 RCRBTC002-D 1 2 3 4 5 6 50 Ω 1 000 pF 50 Ω RF SG. 50 Ω 0.001 µF 33 µF 1 kΩ 10 Ω 0.001 µF Parts in use L1 LQNIH54NK04 L2 LQNIA17NK04 L3 LQNIHR21J04 L4 LQNIA33NK04 Vari-cap. CF1, CF2 X1 (Murata) (Murata) (Murata) (Murata) VFTU RVDSVC203ATX (Sanyo) RLFGFCWN04AL (Murata) RLFDGC01AL (Murata) 8 VBUF