TA31273FN

( DataSheet : www.DataSheet4U.com ) TA31273FN TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA31273FN AM RF/IF Detector IC The TA31273FN is an RF/IF detector IC for AM radio. The IC incorporates an RF amp, 2-level comparator, and local x8 circuit. Features RF frequency: 240 to 450 MHz IF frequency: 10.7 MHz Operating voltage range: 3.0 to 5.5 V Current dissipation: 6.8 mA (typ.) (Not operating local oscillator) Current dissipation at BS: 0 µA (typ.) Small package: 20-pin SSOP (0.65-mm pitch) Weight: 0.09 g (typ.) Block Diagram SAW 20 19 FIL FIL OUT IN 18 17 RSSI BS RSSI 16 15 14 13 12 11 RF RF MIX GND1 RF MONI OUT DEC IN IN Comparator ×8 OSC VCC1 LOBS IN 1 2 3 MIX IF IF OUT VCC2 IN DEC REF GND2 DATA 4 5 6 7 8 9 10 www.DataSheet4U.com 1 www.DataSheet4U.com 2002-07-08 TA31273FN Pin Function (The Values Of Resistor And Capacitor In The Internal Equivalent Circuit Are Typical.) Pin No. Pin Name Function Internal Equivalent Circuit 15 kΩ 1 OSC IN Local oscillator input pin. 1 2 pF 5 kΩ 2 VCC1 Power supply pin 1.  3 LOBS Lo switch pin. H: x8 circuit in operation Lo: Through pass 3 60 kΩ 4 MIX OUT Mixer output pin. 210 Ω 4 5 VCC2 Power supply pin 2.  6 IF IN IF amp input pin. 3 kΩ 170 Ω 170 Ω 7 IF DEC IF amp input pin. Used as a bias coupling pin. 6 15 kΩ 7 DATA 500 Ω 20 8 REF AM comparator REF pin. 19 5.5 kΩ 40 kΩ 5 kΩ 8 40 kΩ  COMP 9 GND2 GND pin 2. 10 DATA AM waveform shaping output pin. Open c...