CVSD CODEC Evaluation Kit

5

EV6090 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.

2 Preliminary Information

2.1 Laboratory Equipment

The following laboratory equipment must be user supplied to use this evaluation kit:

Required

•

2.7-5.0V regulated DC Power Supply

Optional

•

8

Ω speaker or headphones. NOTE: A stereo jack is supported because it is popular and available. If

a mono plug is connected it will mute the output signal by creating a short to ground. A mono

loudspeaker may be connected but it must have a stereo plug.

•

Microphone

•

POTS (Plain Old Telephone System) telephone handset may be used to listen to CVSD encoded and

decoded speech.

2.2 Handling Precautions

This evaluation kit is designed for use in office and laboratory environments. The following practices will help

ensure its proper operation.

2.2.1

Static Protection

This product uses low power CMOS circuits which can be damaged by electrostatic discharge. Partially

damaged circuits can function erroneously, leading to misleading results. Observe ESD precautions at all

times when handling this product.

2.2.2

Contents - Unpacking

Please ensure that you have received all of the items on the separate information sheet (EK6090) and notify

MX-COM within 7 working days if the delivery is incomplete.

3 Operation

3.1 Set-Up

THE EV6090 IS CONFIGURED WITH A CMX639 DIP DEVICE FOR OPERATION AT 2.7 to 5.0VDC.

A 4-conductor modular jack (J2), sometimes referred to as an ‘RJ22 jack,’ has been provided to allow for

quick speak/listen evaluation using a standard POTS handset. The following quick start will allow connection

of a handset and power supply to quickly evaluate encoded and decoded CVSD audio. The user can select

different sample clock rates and modes of operation to familiarize themselves with the operation of the CVSD

device.

EV6090

Power

Supply

J1

J2

Figure 4: POTS Set-Up

3.1.1

Default Jumper Configuration

•

For single supply operation ensure shorting jumpers are installed at locations: E12, E6, E8, P4, and

E5.

•

To use the on-board crystal ensure jumpers E1 and E2 are installed.

•

Ensure jumper E3 is set to position 1 and position 2, and jumper E4 is shorting position 2 to position 3

for audio routing to the handset.

•

Install E13 to route handset to summing amplifier.