TA2057N

TOSHIBA Bipolar Linear Integrated Circuit Silicon Monolithic TA2057N AM / FM IF + FM St DET (for digital tuning system) TA2057N TA2057N is the AM / FM IF + FM St DET system IC, which is designed for DTS radios. This IC is included many functions and these can be used for digital tuning system with IF counter. Features · Suitable for combination 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 TA2057N 2 2002-10-30 TA2057N 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 =...