FEDL7037-003-03
Issue Date:Aug. 09, 2010
ML7037-003
Dual Echo Canceler & Noise Canceler with Dual Codec for Hands-Free
GENERAL DESCRIPTION
The ML7037-003 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 CODEC for the analog interface on the acoustic-side, and another PCM CODEC for the analog interface on
the line-side. On the line-side, in addition to the analog interface, there is also a -law PCM/16-bit linear digital
interface.
Equipped with gain and mute controls for data transmission and reception, a -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.
FEATURES
• Single 3.3 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
Cancelable echo delay time
: 35 dB (typ.) for white noise
:
Single echo canceler mode (only an acoustic echo canceler is enabled)
Tacoud= 64 ms (max)
Dual echo canceler mode (both of an acoustic and line echo cancelers are enabled)
Tacoud = 64 ms
Tlined = 20 ms
• Built-in transmission signal noise canceler
Noise attenuation
: 13 dB (typ.) for white noise
• Built-in 2-channel CODEC’s
• Analog input gain amp’s (Acoustic side = 2 stages; Line-side = 1 stage)
• Analog output configuration: Push-pull drive (can drive a 2.0 k load)
• Receive-side ALC (Auto Level Controler)
• Programmable Gain/Mute
• A slope filter on transmit side
• 16 GPI’s and 8 GPO’s
• Speech digital interface coding formats : µ-law PCM (G.711 [64kbps]), 16-bit linear (2's complement)
• Speech digital interface sync formats
• PCM shift clocks (BCLK)
: Long-frame-sync, short-frame-sync
Clock slave mode : 64kHz to 2.048MHz (µ-law PCM) / 128kHz to 2.048MHz (16bit Linear PCM)
Clock master mode : 64kHz (µ-law PCM) / 128kHz (16bit Linear PCM)
• Master clock frequency : 12.288 MHz (crystal unit the ML7037’s built-in driving circuit for a crystal unit or a
crystal oscillator)
• Transmission signal equalizer
• Package
: 64-pin plastic TQFP (TQFP64-P-1010-0.50-K) (ML7037-003TB)
1/87
LAPIS [ LAPIS Semiconductor Co., Ltd. ]
