GENERAL DESCRIPTION
The MSM7577 is an LSI for Audio Signal Level adjustment for telephone set, etc.
Conventionally, its circuit has been made within individual unit, such as amplifiers, resistors and switches. However, using this LSI allows for simple mounting and economically small space.

FEATURES
Receiving system
• Built-in electrical volume Digital control (3 bit / 8 step)
• For transmission voice, with side tone route available.
• Mute function available.

Transmitting system
• Built-in operational amplifier for transmission signal level adjustment.
• Mute function available.
• Single +2.7 V to +5.25 V power supply
• Power down function
• Package:
    16-pin plastic SOP (SOP16-P-300-1.27-K) (Product name : MSM7577MS-K)

APPLICATION
    Cellular handset, cordless telephone, etc.