CMX649E3数据手册集成电路（IC）的编解码器规格书PDF

描述 Description

Brief Description
The CMX649 Adaptive Delta Modulation(ADM) Voice Codec provides full duplex ADM, companded (µ/A-law) PCM and linear PCM codec and transcoder functions for cost effecive, low power, wireless voice applications. Selectable modes and algorithms support many applications. Robust ADM coding (e.g. CVSD) reduces host protocol and software burdens, eliminating forward error correction, framing protocols and algorithm processing. Dual transcode/decode mode supports multichannel applications. Integrated filter responses adjust independent of 16kbps to 128kbps codec data rates. Codec sample clocks are externally applied or internally generated. High performance analog interfaces and sidetone include digital gain controls. Encoder and decoder voice activity detectors support powersaving.
The CMX649 ADMVoice Codec supports 2.7V to 5.5V operation and is available in 20-pin SOIC (D3) and TSSOP packages (E3) packages.

特性 Features

·  Multiple Codec Modes, 16 to 128 kbps
--   Full duplex ADM and CVSD
--   Full duplex PCM: µ-law, A-law, Linear
--   Configurable ADM time constants
--   Dual channel transcoder/decoder mode
·  High Performance Digital Architecture
·  Low Power: 2.5mA at 3.0V typ.
·  2.7V - 5.5V Supply
·  Data Clock Recovery
·  Programmable Voice Activity Detector (VAD)
--   Adjust threshold level and attack/decay time
--   Use to powersave on low signal level
--   Silence/blank low level signals
·  Programmable Digital Scrambler
·  Flexible Interfaces
--   8-bit and 16-bit burst data with sync strobe
--   1 bit serial data with clock
--   Host serial control/data interface
·  Internal and External Sample Clocking
·  Programmable Filters
--   Encoder mic input ADC anti-alias
--   Decoder audio out DAC anti-imaging
·  Low Noise Differential Mic Input Amp
·  Programmable Analog Interface Gain
--   Microphone in
--   Decoder audio out
--   Sidetone path

Applications
·  Low Cost Digital Cordless Headset
·  Personal Area Network (PAN) Voice Link
·  Digital Cordless Telephone
·  Wireless Digital PBX
·  Full Duplex Digital Radio Systems
·  Time Division Duplex (TDD) Systems
·  Portable Digital Voice Communicator
·  Digital Voice Delay

简介

CMX649E3属于集成电路（IC）的编解码器。由制造生产的CMX649E3编解码器编解码器是用于通过压缩和解压缩来转换数据的半导体器件。数据压缩可提高传输速度并减少存储空间。某些编解码器提供高达 32 位的分辨率，并且分别提供多达 6 个或 8 个模数转换器和数模转换器。除三角积分调制外，还有 I2C、I2S、SPI、串行、HDA、S/DIF、PCM、USB、AC'97 和 SLIMbus 数据接口。