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.

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.