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