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INTEGRATED CIRCUITS
DATA SHEET
TDA3845; TDA3845T Quasi split-sound circuit and AM demodulator
Objective specification File under Integrated Circuits, IC02 January 1993
Philips Semiconductors
Objective specification
Quasi split-sound circuit and AM demodulator
FEATURES • Power supply from 5 V (200 mW) to 8 V source also an alternative 12 V source (12 V not for TDA3845T) • Gain controlled wideband IF amplifier (AC coupled with three stages) • High precision internal 90° phase shifter for quadrature demodulator • Amplitude detector for gain control which operates as a peak detector for FM sound and as a mean level detector for AM sound (switchable) • In-phase wideband synchronous demodulator for AM detection
TDA3845; TDA3845T
• Stabilizer circuit for ripple rejection and constant output s