MSM7557 Overview
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, pressor, pre-emphasis, limiter and splatter filter. Voice receive block consists of Band pass filter, De-emphasis and Expander.
MSM7557 Key Features
- Available to transmit modem signal and also transmit base band voice signal through wireless transmission path (0.3 kHz
- Built-in pandor 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