TA2057N Datasheet | Toshiba

Features - Suitable for bination with digital tuning system which has IF counter. - One terminal type AM / FM IF count output (auto stop signal) for IF counter of digitl tuning system. - Built- in mute circuit for IF count output. Weight: 1.2g (typ.) - Adjustable for IF count output sensitivity by external resistance of pin(2) (AM), and pin(3) (FM). - For adopting ceramic discriminator and ceramic resonator, it is not necessary to adjust the FM quad detector circuit and FM st DET vco circuit. - Built- in AM local oscillator buffer output circuit. - Built- in AM IF buffer output circuit for AM stereo. - Operating supply voltage range (Ta = 25°C): VCC = 3.5~14V ※Handle with care to prevent devices from deteriorations by static electricity. 1 2002-10-30 Block Diagram 2 2002-10-30 Terminal Explanation (terminal voltage shows typical value at Ta = 25°C, VCC = 5V, SW3 = off, SW9 = GND, and non-signal test circuit) Pin No. Characteristic Internal Circuit DC Voltage (V) FM AM 1 AM RF in 1.95 1.95 AM s･sens - AM IF count output sensitivity adjust terminal 2 - Bias terminal for AM IF / DET out switch circuit V2 = GND →AM DET out (pin(19)) V2 = Vstb →AM IF out (pin(19)) FM s･sens 3 - FM IF count output sensitivity adjust terminal 0.5 (at SW9 = Vstb1.45) R2 = 10kΩ 0.5 (at SW9 = Vstb1.45) R2 = 10kΩ 00 R3 = 10kΩ R3 = 10kΩ 3 2002-10-30 Pin No. Characteristic 4 AM OSC Internal Circuit DC Voltage (V) FM AM 1.95 1.95 5 AM OSC out 6 VCC 7 AGC 8 GND IF out / REQ - IF count output terminal - IF count output / FM st DET mute circuit control terminal V9 = VCC → on V9 = open →...