ICs for FM/AM Tuner AN7208SA TV/FM front-end IC for 1.5 V headphone stereo ■ Overview Unit : mm 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. 10 ■ Features +0.10 1 4.3±0.3 6.3±0.3 11 0.15 − 0.05 6.5±0.3 20 0.25±0.10 Seating plane 0.65±0.10 0.1±0.1 0.65 (0.33) 0.65±0.10 1.5±0.2 (0.50) • 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 Seating plane ■ Applications SSOP020-P-0225A • 1.5 V headphone stereo (VCC 1.0 V to 2.0 V) 11 12 13 15 14 TV OSC Power 10 9 8 2nd IF amp. 6 5 1st IF amp. 4 TV mix. 3 2 1 TV RF OSC buffer 7 FM OSC FM mix. FM RF 16 17 18 19 20 ■ Block Diagram 1 AN7208SA ICs for FM/AM Tuner ■ Pin Descriptions Pin No. Description Pin No. Description 1 FM RF input 11 VCC2 2 TV RF input 12 STDBY 3 GND 1 13 TV OSC 1 4 N.C. 14 TV OSC 2 5 IF out 1 15 OSC buff. 6 Mode SW 16 FM OSC 1 7 IF in 17 FM OSC 2 8 IF gain control 18 TV RF 9 IF out 2 19 FM RF 10 GND 2 20 VCC1 ■ Absolute Maximum Ratings Parameter Symbol Rating Unit Supply voltage VCC 2.5 V Supply current ICC 12 mA PD 30 mW Topr −20 to +75 °C Tstg −55 to +125 °C Power dissipation Operating ambient temperature Storage temperature *1 *1 Note) *1 : All items are at Ta = 25°C, except for the operating ambient temperature and storage temperature. ■ Recommended Operating Range Parameter Supply voltage Symbol Range Unit VCC 1.0 to 2.0 V ■ Electrical Characteristics at VCC = 1.2 V, Ta = 25°C Parameter Symbol Conditions Min Typ Max Unit 30 38 46 dB TV fIN = 221.75 MHz Conversion gain *1 GCONV(TV) fOUT = 10.6 MHz VOSC(TV) VCC = 0.95 V 15 27 mV[rms] S/N(TV) Input level = 60 dBµ 1 kHz 30% Mod. 41 44 dB Quiescent current ITOT(TV) 8.8 12 mA Oscillation buffer output VBUF(TV) VCC = 0.95 V 39 62 mV[rms] Oscillation voltage S/N *2 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 AN7208SA ■ Electrical Characteristics at VCC = 1.2 V, Ta = 25°C (continued) Parameter Symbol Conditions Min Typ Max Unit −1.8 1.8 mV[p-0] 30 38 46 dB TV fIN = 221.75 MHz (continued) Burst noise *3 VNO(TV) Input level = 60 dBµ Non-modulation FM fIN = 107.88 MHz GCONV(FM) fOUT = 10.6 MHz Conversion gain *1 Oscillation voltage S/N *2 VOSC(FM) VCC = 0.95 V 40 63 mV[rms] S/N(FM) Input level = 60 dBµ 1 kHz 30% mod. 48 51 dB 7.7 10 mA 66 132 mV[rms] −1.8 1.8 mV[p-0] Quiescent current ITOT(FM) Oscillation buffer output VBUF(FM) VCC = 0.95 V VNO(FM) Input level = 60 dBµ Non-modulation 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) ■ Terminal Equivalent Circuits Pin No. Equivalent circuit Description 1 FM RF input 19 To mix. Input resistance or pin voltage Approx. VCC − 0.7 V RF signal input in FM band (Common base type) 1 2 TV RF input 18 To mix. Approx. VCC − 0.7 V RF signal input in TV band (Common base type) 2 3 AN7208SA ICs for FM/AM Tuner ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit 3 Description GND 1 Input resistance or pin voltage GND pin (RF, mix. block) 4 N.C. 5 IF out 1 Approx. 330 Ω Approx. VCC − 0.7 V Outputs IF signal of TV/FM 5 6 VCC Mode SW Switch of band switching VCC : TV mode Open/GND : FM mode 6 7 IF in IF amp. block input 7 4 Approx. 5 kΩ ICs for FM/AM Tuner AN7208SA ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit Description 8 IF gain control 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 Approx. 330 Ω Approx. VCC − 0.7 V IF amp. block output 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 ICs for FM/AM Tuner ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit Description 13 TV OSC 1 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 Approx. 10 kΩ Approx. VCC Connects a local oscillator coil of 13 TV band 14 VCC 15 OSC buff. Approx. 150 Ω Approx. VCC − 0.2 V Oscillator buffer output pin 15 16 FM OSC 1 Connects a local oscillator coil of 16 FM band 17 VCC 6 Approx. 10 kΩ Approx. VCC ICs for FM/AM Tuner AN7208SA ■ Terminal Equivalent Circuits (continued) Pin No. Equivalent circuit Description 17 FM OSC 2 Input resistance or pin voltage Approx. 10 kΩ Approx. VCC Connects a local oscillator coil of 16 17 VCC 18 FM band TV RF To mix. 18 Connects an RF tuning coil of TV band 2 19 FM RF To mix. 19 Connects an RF tuning coil of FM band 1 20 VCC1 Power supply pin (RF, mix.block) 7 AN7208SA ICs for FM/AM Tuner 0.047 µF AN7233SH 0.047 µF 0.022 µF 15 Out 17 1 µF 0.022 µF 5.1 kΩ 20 21 10 kΩ 100 µF VOSC(TV) 22 23 0.1 µF 1 kΩ 680 pF 0.1 µF 10 kΩ 100 µF 15 kΩ 1 000 pF 24 25 1 000 pF 26 2SC3935 4.7 kΩ 330 pF IF out 13 AM AF in GND Quad Det. out 19 MPX in 15 V 1 µF 100 Ω IF req. 16 AM D 18 50 Ω ET 1 µF 27 28 3 pF 50 Ω 14 12 220 Ω X1 11 0.01 µF VCC 10 R-ch. SD 9 L-ch. ST. Band Mute PLL 1 VBUF VCC1(1.2 V/0.98 V) VCC2(1.5 V) ■ Application Circuit Example FMIF in PLL 2 AMIF in VCO AM AGC LPF 1 VCC LPF 2 AM mix. 100 µF 51 kΩ 8 7 22 µF 6 330 Ω 5 4 S/N Measurement Others 3 2 CF2 1 AM OSC AM in 50 Ω 56 pF VOSC(FM) 470 kΩ 0.001 pF 1 000 pF 100 Ω 4.7 kΩ 470 kΩ D4 L4 1 000 pF 2SC3935 470 kΩ 56 pF 5 pF 390 pF 0.022 pF 1 000 pF 10 Ω 0.001 µF 470 kΩ 100 Ω 2SC3935 4.7 kΩ D3 470kΩ 1 000 pF L3 AN7208SA 470 kΩ 11 V 390 pF L2 47 pF CC2 12 20 pF 470 kΩ STDBY 13 D2 IF out 9 IF gain 8 14 TV OSC 15 GND 2 10 IF in 7 OSC buff. TV/FM 0.001 µF 0.01 µF TV FM 56 kΩ CF1 6 470 kΩ 0.001 µF 17 470 kΩ 18 D1 19 10 Ω IF out 20 pF 470 kΩ 20 FM OSC N.C. 4 TV RF GND1 FM RF TV in VCC1 5 RCRBTC002-D 16 L1 270 pF FM in 3 2 1 2 3 4 5 6 1 000 pF 50 Ω 1 50 Ω 0.001 µF 33 µF RF SG. 0.001 µF 1 kΩ VFTU 10 Ω 8 Parts in use L1 LQNIH54NK04 L2 LQNIA17NK04 L3 LQNIHR21J04 L4 LQNIA33NK04 50 Ω (Murata) (Murata) (Murata) (Murata) Vari-cap. RVDSVC203ATX (Sanyo) CF1, CF2 X1 RLFGFCWN04AL (Murata) RLFDGC01AL (Murata)