CMX615
Digital Line to
POTS Interface
D/615/4 December 1999
Provisional Issue
Features
•
Pre-Programmed Tone Generators
•
Fully Integrated DTMF Encoder
•
SPM Generator
•
Simple Serial Control Interface
•
‘Zero-Power’ (1µA) Standby Mode
•
3.58MHz Xtal/Clock
•
V23/Bell 202 FSK Generator
•
Digital Ringing Voltage Generator
Applications
•
Digital Line to POTS Interface
•
Subscriber Terminal Adapters
•
Wireless Local Loop
•
Computer Telephony Integration
•
Telephone/Radio Patch Systems
•
Pair Gain Systems
•
Billing/SPM Systems
1.1
Brief Description
The CMX615 is an integrated telecom tone generator and DTMF encoder designed for ISDN interfaces,
Wireless Local Loop and Analogue to Digital Phone Conversion systems. The tone generator covers an
extensive range of pre-programmed tones used in analogue phone systems (POTS). Three outputs are
provided: ‘Ringing signals’, ‘In-band tones or FSK data’, and ‘12kHz/16kHz Metering pulses’. Simple software
control facilitates the interface to a wide range of commonly used µCs and SLICs, enabling a comprehensive
analogue telephone line presentation.
The DTMF encoder generates the appropriate DTMF tones for the POTS interface. DTMF tone pairs can be
encoded along with each tone singly or with other dual tone signals, such as those used in CIDCW systems
and ‘On Hook’ signalling systems.
Other tone standards supported are: Fax and Modem ‘answer’ and ‘originate’, ITU (CCITT) ‘R1’ and ‘R2’
signals, and sufficient tones for simple melody generation. Communication to and from the host µController is
performed by a ‘C-BUS’ serial interface, which is compatible with the ‘SPI’ interface.
©
1999
Consumer Microcircuits Limited
CMLMICRO [ CML MICROCIRCUITS ]
