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Description

The ML7037-002 is an IC device developed for portable, handsfree communication with built-in line echo canceler, acoustic echo canceler, and transmission signal noise canceler. Built-in to the voice signal interface is a PCM linear CODEC for the analog interface on the acoustic-side, and a PCM linear CODEC for the analog interface on the line-side. On the line-side, in addition to the analog interface, there is also a µ-law PCM/16-bit linear digital interface. Equipped with gain and mute controls for data transmission and reception, a µ-law PCM/16-bit linear digital interface for memo recording and message output, and transfer clock and sync clock generators for digital communication, this device is ideally suited for a handsfree system.

Block Diagrams

Features

»	Single 3 V Power Supply Operation (3.0 to 3.6 V) [with built-in regulator to generate internal power supply]
»	Built-in 2-channel (line and acoustic) echo canceler »  Echo attenuation: 35 dB (typ.) for white noise »  Cancelable echo delay time: »  Single echo canceler mode (only an acoustic echo canceler is enabled) Tacoud = 100 ms (max.) »  Dual echo canceler mode (both of an acoustic and line echo cancelers are enabled) Tacoud = 100 ms; Tlined = 20 ms
»	Built-in transmission signal noise canceler »  Noise attenuation : 17 dB (typ.) for white noise 40 dB (typ.) for single tone
»	Built-in 2-channel CODEC »  Synchronous transmission and reception enables full duplex operation
»	Built-in analog input gain amp stage (max. gain = 30 dB)
»	Analog output configuration: Push-pull drive (can drive a 2.0 k load)
»	Receive-side ALC’s (Auto Level Controlers)
»	Programmable Gain/Mute
»	A slope filter on transmit side
»	16 GPI’s and 5 GPO’s