EV6090 Datasheet, PDF (5/12 Pages) CML Microcircuits – ADVANCE INFORMATION

CVSD CODEC Evaluation Kit
5
EV6090 Evaluation Kit
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
• 8Ω 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.
J2
EV6090
J1
Power
Supply
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.
2001 MX-COM, Inc.
www.mxcom.com tel: [phone] 744 5050 fax: [phone]
Doc. # 20480218.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.