ICs for FM/AM Tuner AN7289NFBQ FM-FE+AM IC for car radio Unit : mm 24 16 0.3+0.10 –0.05 25 0.8 ■ Features 9.2±0.4 The AN7289NFBQ is an IC having FM-FE+AM functions for car radio. A tuner block of car radio can be constructed by using this IC and the AN7293NSC/NFBQ. 17 7.0±0.3 ■ Overview 32 9 8 7.0±0.3 9.2±0.4 LQFP032-P-0707 (0.55) 0.625±0.100 1.4±0.2 0.1±0.1 1 0.15+0.10 –0.05 0.625±0.100 • A less number of electrolytic capacitors is required (3 capacitors reduction compared with our conventional IC) • AM: Effective sensitivity is improved by 2 dB through ATC • AM: Strong-input characteristic is improved by 2-loopAGC function • The AN7289NSC of DIL package type is also available ■ Applications • Car radios 17 18 19 20 21 FM-PIN D 22 23 24 FM-mix. in ■ Block Diagram FM/AM SW VFOSC 25 16 FM AGC VAOSC 26 FM mix. AM OSC GND2 27 28 15 14 FM IF amp. FE OSC 13 AM mix. Keyed-AGC in 29 12 AM. S-meter 8 9 GND1 AM-IF out 7 AM IF amp. AM SSC AM-IF count 3 VCC 2 1 32 11 10 AM det. 6 31 AM RF AGC AM IF AGC AM-S. meter 5 AM ATC AM-SD out 4 AM-AFOUT 30 1 AN7289NFBQ ICs for FM/AM Tuner ■ Pin Descriptions Pin No. Description Pin No. Description 1 AM detection output 17 FM-PIN diode driver 2 VCC1 18 AM-OSC coil pin 3 AM-IF counter output/DX/LO SW 19 FM-mix. output 2 4 AM-SD output 20 FM-mix. output 1 5 AM-signal meter output 21 FM-PIN diode driver 6 FM-IF output 22 FM-mix. input 7 AM-IF output 23 VCC2 /FM/AM SW 8 GND1 24 FM-AGC output 9 SSC 25 FM-OSC buffer output 10 AM-RF level detection 26 AM-OSC buffer output/FE-AGC sensitivity setting 11 AM-WAGC detection/DX setting 27 GND2 12 AM-IF input 28 FM-OSC coil pin 13 AM-mix. output 29 FM-keyed-AGC input 14 FM-IF input 30 AM-AM output/LO setting 15 AM-RF gain control 31 AM-ATC input 16 AM-mix. input 32 AM-IF level detection ■ Absolute Maximum Ratings Parameter Supply voltage Supply current Power dissipation *2 Operating ambient temperature Storage temperature *1 *1 Symbol Rating Unit VCC 9.1 V ICC 56 mA PD 343.3 mW Topr −35 to +80 °C Tstg −55 to +125 °C Note) *1: Ta = 25°C except power dissipation, operating ambient temperature and storage temperature. *2: Referring to "■ Technical Information" for power dissipation at Ta = 80°C, use the circuit under the conditions not exceeding the allowable limit value. ■ Recommended Operating Range Parameter Supply voltage 2 Symbol Range Unit VCC 7.2 to 9.0 V ICs for FM/AM Tuner AN7289NFBQ ■ Electrical Characteristics at Ta = 25°C • AM mode at VCC = 8.0 V, fIN2 = 1 MHz Parameter Symbol Conditions Min Typ Max Unit AM consumption current 1 amLT1 Without input 28 36 44 mA AM consumption current 2 amLT2 fIN2 = 1 MHz, VIN2 = 130 dBµ 33 41 49 mA AM-AF output amVO VIN2 = 74 dBµ, 400 Hz 30%, AM-AF output 105 135 160 mV AM signal-to-noise ratio amSN VIN2 = 74 dBµ, 400 Hz 30%, AM-AF output S/N 48 52 58 dB AM-AGC width amW VIN2 = 74 dBµ, 400 Hz 30%, AM-AF output −10 dB input change 56 60 64 dB amATC (Output ratio [dB] of 400 Hz and 3 kHz when VIN2 = 18 dBµ) − (output ratio 3.5 6.5 9.5 dB AM-ATC operation [dB] of 400 Hz and 3 kHz when VIN2 = 74 dBµ) 80%Mod., AM-AFOUT output AM-distortion rate 1 amT1 VIN2 = 74 dBµ, 400 Hz 80%, AM-AF output distortion 0.01 0.5 1.5 % AM-distortion rate 2 amT2 VIN2 = 130 dBµ, 400 Hz 80%, AM-AF output distortion 0.01 0.5 1.5 % AM wide band AGC on input amVW fIN2 = 1.4 MHz, input when pin 15 voltage becomes below 3 V 96 102 108 dBµ AM local oscillation buffer output amVOS Without input 160 210 260 mV AM-IF count output 1 amIF1 VIN2 = 40 dBµ 150 210 270 mV AM-IF count output 2 amIF2 Without input 10 mV AM-SD output 1 amSD1 VIN2 = 40 dBµ 4.5 4.9 5.1 V AM-SD output 2 amSD2 Without input 0.0 0.2 0.5 V AM signal meter output 1 amVS1 Without input, pin 5 voltage 1 50 200 mV AM signal meter output 2 amVS2 VIN2 = 30 dBµ, pin 5 voltage 0.8 1.05 1.3 V AM signal meter output 3 amVS3 VIN2 = 130 dBµ, pin 5 voltage 4.1 4.8 5.1 V AM search sensitivity DX amDX AM-IF count output is over 120 mV VIN2 when f becomes 450 kHz±2 kHz 23 29 35 dBµ AM search sensitivity LO amLO AM-IF count output is over 120 mV VIN2 when f becomes 450 kHz±2 kHz 43 49 55 dBµ Note) FM tuning condition: Adjust VATU voltage so that VAOSC output frequency becomes 1 450 kHz±500 Hz 3 AN7289NFBQ ICs for FM/AM Tuner ■ Electrical Characteristics at Ta = 25°C (continued) • FM mode at VCC = 8.0 V, fIN1 = 98 MHz Parameter Symbol FM local oscillation buffer output fmVOS Conditions Min Typ Max Unit fOSC = 108.7 MHz, without input 140 200 260 mV VIN1 = 71 dBµ 40 75 110 mV FM-IF output level fmIF FM-AGC sensitivity fmAGC VIN1 level when V24 becomes 3 V 60 64 68 dBµ High-level FM-AGC voltage fmVAH VIN1 = 70 dBµ 6.0 6.4 6.8 V Low-level FM-AGC voltage fmVAL VIN1 = 82 dBµ 0.05 0.5 V fmIT Without input 26 35 44 mA FM consumption current Note) FM tuning condition: Adjust VFTU voltage so that VFOSC output frequency becomes 108.7 MHz±10 kHz. ■ Technical Information • PD Ta curves of LQFP032-P-0707 P D Ta 1.600 1.400 1.388 Power dissipation PD (W) 1.200 Mounted on standard board (grass epoxy : 50 mm × 50 mm × t0.8 mm) Rth(j-a) = 90.0°C/W 1.000 0.800 0.613 0.600 Independent IC without heat shink Rth(j-a) = 203.7°C/W 0.400 0.200 0.000 0 25 50 75 100 Ambient temperature Ta (°C) 4 125 150 ICs for FM/AM Tuner AN7289NFBQ AM-ANT AM-VT 0.01 µF 16 0.022 µF 26 15 GND2 27 14 33 pF 28 13 29 12 30 11 10 kΩ 31 10 FE-VT 5.6 kΩ 50 kΩ 0.047 µF 8 GND1 6 7 100 kΩ 0.1 µF 5 4 3 0.01 µF 0.022 µF 100 µF 100 kΩ Seek on LO off DX/LO DX 5V AM-IF out 100 µF 0.22 µF AM-SD out AM-S. meter 0.1 µF 0.1 µF VCC 510 kΩ AM-IF count 1 9 12 kΩ 0.022 µF 2SK435 SFPS-450H 32 0.1 µF 0.022 µF 1 µF MS3 510 kΩ VCC 2 0.1 µF 10 kΩ Keyed-AGC in 10 kΩ 3.9 kΩ AMAFOUT 3 pF 2SC828A 0.022 µF 17 18 19 20 21 22 25 3 pF 1 pF 0.047 µF 1000 pF 5 kΩ VAOSC 23 24 0.22 µF 4 pF 3 pF VFOSC 8.2 µH 10 kΩ 100 kΩ 10 Ω FM-mix. in FM AM FM-PIN D ■ Application Circuit Example 5