COMMUNICATION SEMICONDUCTORS

EV6090

USER MANUAL

CMX639 CVSD CODEC

Evaluation Kit

2001 MX-COM, Inc.

www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054

Doc. # 20480218.003

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

All trademarks and service marks are held by their respective companies.

ADVANCE INFORMATION

• CMX639 Product Evaluation

• Telephone Handset Connectors

• On-board Speaker Driver

•

Variable Gain Input Amplifier

• Selectable Sample Clock Rates

• Easy Jumper/Switch configuration

• User Prototyping PCB Area

x(-1)

x(-47)

to

+20dB

0dB

to

-6dB

Speaker

Driver

+20dB

Computer

Interface

Direct Out

P1: 1

E3

E4

XTAL

Switch Control (Local)

V+

I N

VDD

I N

AGND

V-

I N

Power

Conditioning

Telephone

Handset (Mic)

Telephone

Handset

(Earpiece)

CMX639

Audio +In

Audio -In

Input Conditioning

Gain Block

Direct In

P1: 2

P1: 3,4

Data Rate (2)

Algorithm

Force Idle (2)

Data En

Powersave

Mic Input

Dec In

2

3

4

D M

D M

Enc In

Dec Out

Enc Out

Dec In

Data

Clocks

The EV6090 is a single board evaluation platform used for the evaluation of the CMX639 CVSD codec. The

board is powered from an external supply that can be used to evaluate CVSD encoder and decoder

performance at different supply voltages.

Jumpers are provided to select signal paths, clock source, measure device current, etc.

Convenient I/O allows connection to a telephone handset, microphone, and/or a loudspeaker for simple

experiments.