LA1235

The Sanyo Denki LA1235 is a monolithic linear IC developed for high signal-to-noise (S/N) ratio and low distortion FM IF system applications. This IC integrates nearly all functions required for an FM tuner IF stage, boasting a typical S/N of 88dB and a distortion factor of 0.015%.

Key features include a 6-stage IF amplifier and limiter for excellent AMR, followed by a signal meter driver. The FM detector stage utilizes a double-balanced quadrature detector, complemented by a low-frequency preamplifier and muting controller. The muting system includes weak signal and detuning muting drive outputs, with hysteresis in the weak signal muting circuit to prevent malfunction due to amplitude components.

Additional functionalities comprise AFC and tuning meter drive outputs, adjustable via external resistors. An IF amplifier stop circuit is included to reduce noise during AM reception mode switching. The LA1235 is housed in a DIP16 package, suitable for various FM receiver designs requiring robust IF processing.

This IC is designed for applications demanding high performance in FM reception, ensuring clear audio output with minimal noise and distortion. Its integrated nature simplifies circuit design and reduces component count.