Q. Can you detail the differences of the CMX865A with respect to the CMX865?
A. The listing below should help you:
Primary Target Markets
- Wireless Local Loop, aka Fixed Wireless (or Cellluar) Terminals
- Alarm systems
- PBXs
Advantages over CMX865
- Smaller package, less pins = smaller footprint
- Pin count reduced from 24 to 16
- V.21 function instated
- No MOQ
Functional difference from the CMX865
- The RT and RD pins are removed. The ring detector function is not required in Wireless Local
Loops and most alarm systems.
- The hookswitch pin is not present. This is a simple output function that is more cost-effective when moved
to the host processor.
- The receiver interface has been simplified by making it single-ended.
The internal hybrid function eliminates the need for a differential receiver.
- V.21 transceive capability has been instated for alarm panels and other niche applications.
Development Support
- A series of Application Notes to assist with design-ins to the target markets
- Can be evaluated in the EV8600 Modem Evaluation Kit
- An adapter board to allow device evaluation in a dual-in-line footprint
Summary
- The CMX865A is designed to interface easily to a SLIC. All of the transmit signals are summed within the
device and there is a register for software setting the output signal level (the same as the CMX865).
The output can be single-ended or differential and the unused driver can be tri-stated to reduce current consumption.
- The input is single-ended with a gain-setting, feedback path for convenience. Like the CMX865, the CMX865A also
has a software controlled input level setting register.
- The CMX865A will provide exactly the same signalling as the CMX865 and is directly register compatible.
- The CMX865A does not provide the ring generator or SPM generator of the CMX605 but these functions are easily added
using a microprocessor's GPIO pins and simple filtering.
- The operating voltage is the same as the CMX865 but the operating current is expected to be slightly lower.
Q. What is the difference between the CMX865 and the CMX865A?
A. The table below gives a basic outline of the differences:
|
CMX865
|
CMX865A
|
Notes
|
|
24-pin
|
16-pin
|
|
|
TSSOP/SOIC/DIL
|
TSSOP/SOIC
|
HB865A header to convert CMX865A to DIL for evaluation
|
|
No V.21
|
V.21 modem
|
|
|
RT and RD pins
|
No ring detector interface
|
|
|
Hookswitch output
|
No hookswitch interface
|
|
|
Single ended or differential input on receiver
|
Single ended receive only
|
Hardware gain adjustment on both devices
|
Q. What is the correct procedure to follow after power is applied to the CMX865/A?
Q. What is the procedure for returning the CMX865/A to normal operation following
Powersave mode?
A. The algorithm, "Recommended
Start-up and Powersave procedure for the CMX865/A" shows
how to manage the CMX865/A after powering it on or bringing it out of Powersave mode.
Please note the CML disclaimer notice
for applications and FAQ information.