Overview

The LA4587M is a system IC that includes all of the necessary functions for a playback set on a single chip, reducing the number of external components needed.

Features

• Preamplifier has a high open-loop gain (VGO = 73 dB).

• Preamplifier requires no NF capacitor.

• Virtual ground capacitor can be 1 µF or less. (Lower impedance is achieved by having a VREF amplifier built in.)

• Ripple filter requires no capacitor for preventing oscillation.

• Powerful output is obtained in low boost output (Po = 21 mW/VCC = 1.2 V, f = 100 Hz).

• A high-frequency cutoff capacitor is built into the preamplifier and power amplifier inputs; anti-buzz provision.

Functions

• Stereo preamplifier (supports auto reverse function, switchable between metal and normal tape)

• Stereo power amplifier (OCL, mute function)

• Ripple filter

• Low boost function (BTL operation in low-frequency range)

• AMSS (Automatic Music Select System)

• Power switch