DTMF Codec/FSK Combo
- V.23 1200/75, 1200/1200, 75, 1200 bps FSK
- Bell 202 1200/150, 1200/1200, 150, 1200 bps FSK
- V.21 or Bell 103 300/300 bps FSK
- Low Voice Falsing DTMF Decoder
- DTMF/Tones Transmit and Receive
- Low Power - High Performance
- 'Powersave' Standby Mode
- Can achieve simple voice record and playback actions
- Wireless Local Loop
- Fixed Wireless Terminals (FCT/FWT)
- SMS Phones
- Security Systems
- Remote Utility Meter Reading
- Industrial Control Systems
- Pay-Phones
- Set-Top Boxes
- CMX865AD4 - 16-pin SOIC
- CMX865AE4 - 16-pin TSSOP
- 3.0 to 3.6 V power supply
The CMX865A is a multi-standard modem for use in Wireless Local Loop, including Fixed Wireless Terminals and Fixed Wireless Phone installations and Short Message Service telephone systems.
Flexible line driver, hybrid and receiver circuits are integrated on chip, requiring only passive external components to build a 2 or 4-wire line interface.
POTS Signalling
A high-quality DTMF decoder with excellent immunity to falsing-on-voice, and a standard DTMF
encoder are included.
Alternatively, these blocks can be used to transmit and detect user-specific: programmed single
and dual-tone signals, simple melodies, call progess signals or modem calling and answering tones.
Host control and data transfer is via a high-speed serial bus that operates in 'normal' and
'powersave' modes, and which is compatible with most simple types of µC serial interface.
An embedded USART allows multi-format asynchronous data and unformatted synchronous data to
be received or transmitted as 8-bit bytes.
Block Diagram
