MSM7557 - OKI

MSM7557 Single Chip MSK Modem with Compandor for Cordless Telephone

The MSM7557 is a single chip MSK modem with base band voice processor for cordless telephone. The MSM7557 voice transmit block consists of high pass filter, compressor, pre-emphasis, limiter and splatter filter. Voice receive block consists of Band pass filter, De-emphasis and Expander. FEATURES • Available to transmit modem signal and also transmit base ba.

Features

• Available to transmit modem signal and also transmit base band voice signal through wireless transmission path (0.3 kHz to 3.4 kHz)
• Built-in compandor circuit
• Upper limit of voice band (3306 Hz/3400 Hz/3500 Hz) is selectable
• Modem bit rate (2400/1200 bps) is selectable
• Transmit function and receive function operate separately
• Emphasis mode selectable
• Built-in bit synchronous detector and frame synchronous detector
• Built-in limiter level generator and external limit voltage input
• Dynamic range selectable
• Built-in crystal oscillator circuit
• Wide range power supply voltage (.