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Details, datasheet, quote on part number:FX818
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Datasheet text preview:
CML Semiconductor Products
CTCSS Signalling Processor
FX818
D/818/4 July 1997 Provisional Issue
1.0
Features Fast CTCSS Detection Non Predictive Tone Detection Low Power 3.3V/5V Operation Variable Gain Audio Filter
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Programmable Tone Decoder Programmable Modulator Drivers Programmable Tone Encoders Compact (SSOP and SOIC) Packaging
1.1
Brief Description
The FX818 is an innovative CTCSS Codec designed for the latest generation of Land Mobile Radio equipment. The FX818 is full duplex and has many advanced features which assist the operation of modern CTCSS based systems. The FX818 is electrically, physically and software compatible with the FX828. It permits manufacturers to add new features to their equipment with minimal design changes. The FX818 incorporates a programmable tone decoder which can be set to respond to between 1 and 15 CTCSS tones with minimum software intervention. In addition, a 'Fast' CTCSS detector can respond to a single programmed tone in 60ms, or can be used to provide an output if any CTCSS tone is present at the detector input. A high resolution tone encoder performs accurate generation of any CTCSS tone in current use. High pass and low pass filters are included to provide filtering for CTCSS and Voice band signals. On chip audio summation amplifier and digital adjustable modulator drivers ensure easy integration into equipment. The FX818 along with the FX828 is offered in a choice of small SSOP and SOIC 24-pin packages. It may be used with 3.0 to 5.5 volt supply.
© 1997 Consumer Microcircuits Limited
CTCSS Signalling Processor
FX818
CONTENTS Section Page
1.0 Features .......... 1 1.2 Block Diagram ...... 3 1.3 Signal List ............. 4 1.3 Signal List ............. 4 1.4 External Components ... 6 1.4 External Components ... 6 1.5 General Description ...... 7 1.5.1 Software Description ............ 7 1.6 Application Notes........ 18 1.6.1 General ......... 18 1.6.2 Transmitter .. 18 1.6.3 Receiver (Decode) ...... 18 1.6.4 Receiver (Fast Detect) ........ 19 1.6.5 General Purpose Timer....... 19 1.6.6 Tx / Fast Rx Tone Table ...... 19 1.6.7 Rx Program Tone Table...... 20 1.7 Performance Specification ........ 21 1.7.1 Electrical Performance ....... 21 1.7.2 Packaging .... 26
Note:
As this product is still in development, it is likely that a number of changes and additions will be made to this specification. Items marked TBD or left blank will be included in later issues.
© 1997 Consumer Microcircuits Limited
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D/818/4
CTCSS Signalling Processor
FX818
1.2
Block Diagram
Figure 1 Block Diagram
© 1997 Consumer Microcircuits Limited
3
D/818/4
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