Overview

The LA1875M is an electronic tuner IC that incorporates AM, FM IF and MPX circuit sections on a single chip, making it ideal for use in car stereo equipment. The LA1875M features an antenna-damping AM AGC cir

cuit with rapid charge and discharge characteristics. It also features an S-meter driver, tuning and FM-stereo LED out puts, FM soft-mute and forced mono modes and a no-ad justment MPX VCO.

The LA1875M AM circuit comprises a mixer, oscillator, RF AGC, IF amplifier and IF buffer. The FM IF circuit com

prises an IF amplifier, eqadrature detector, and AFC and IF buffer outputs. The MPX circuit comprises a VCO and stereo noise control (SNC) and high-cut control (HCC) circuits.

The LA1875M operates from a 7 to 10V supply and is available in 36-pin MFPs.

特性 Features

? AM, FM IF and MPX circuits.

? Antenna-damping AM AGC circuit with rapid charge and discharge characteristics.

? S-meter driver.

? Tuning and FM-stereo LED outputs.

? AFC and IF buffer outputs.

? AM mixer, oscillator, AGC, IF amplifier and IF buffer.

? FM IF amplifier, quadrature detector.

? MPX no-adjustment VCO, SNC and HCC.

? FM soft-mute and forced-mono modes.

? 7 to 10V supply.

? 36-pin MFP.