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CMX823 Programmable Paging-Tone Decoder
The CMX823 can decode any combination of up to 32 different in-band tones from a user-programmed on-chip list, received in any order. With a decode frequency range of 280Hz to 3500Hz and a Signal-to-Noise Ratio of -4dB, this ultra low-power product is ideal for the majority of paging and selective calling applications, offering reliability in even the most hostile of signalling environments. Total Versatility is the thinking behind the design of this multiple-format tone-decoder as, under serial data control, this product has the selectable option of two measurement modes (Fast and Slow) to efficiently facilitate various tone format periods, operating conditions and host Controller requirements. Decode Speed: Employing two user-defined on-chip lists, the CMX823 can store up to 32 tones per list with the ability to rapidly switch between lists to facilitate different toneset formats. Each list can be further subdivided to allow even faster tone recognition. Tone lists can be dynamically uploaded by the host C if required.
Applications
INNOVATIONS INV/TwoWay/823/1 August 2003
An Ultra-Low-Power Audio Tone Decoder for Paging Operations in Low Signal-to-Noise Environments
www.cmlmicro.com
The CML Advantage
n Decodes from a List of 32 Tones
n Two Separate 32-Tone Lists Available n All Tone Frequencies are User Defined n `Fast Switch' Between Tone Lists
n Superior Signal-to-Noise (-4dB) Performance n Selectable `Fast' and `Slow' Measurement Modes
Facilitate All Toneset Formats
n n n n
Integral NOTONE Timer Versatile Status and Interrupt Indications Control and Data via C-BUS Serial Interface Low-Power 2.7 Volt Operation with `Zero-Power' Mode
n Two-Tone and Multi-Tone Tone Pagers n Voice Pager Switching and Signalling n Selective Calling (Selcall) n Revertive Paging n Wireless Local Loop Signalling n Audio Tone Signalling
n 2.7 to 5.5 Volt Operating Voltage Range n Compact 16-Pin TSSOP and DIL Packaging
Decodes Signals Through The Noise Floor!
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
Application Specific Standard Products for Two-Way Radio, Wireline Telecoms and Wireless Data
Two-Way Radio
The CMX823 Simple, Versatile, Efficient and Fast
Specification Supply Voltage Range Operating Current (typ.) VDD = 2.7V VDD = 5.0V Zero Power Current VDD = 2.7V VDD = 5.0V Tone Frequency Range Decode Signal-to-Noise Ratio Tone Storage Capacity Tone Measurement Modes Response Time Fast Mode Slow Mode De-response Time Fast Mode Slow Mode Decode Bandwidth Range Control and Data Package Styles 2.7V to 5.5V 0.75mA 1.5mA 1.0A 1.0A 280Hz to 3500Hz -4dB 2 Sets of 32 Tones Fast and Slow 28ms 33ms 46ms 79ms 0.1% to 3.1% C-BUS Serial Interface E4 P3 16-pin TSSOP 16-pin DIL Input Gain
The component-adjustable op-amp input stage is available to adjust the received signal to the correct amplitude for the decoder process.
VSS VDD SIGNAL IN Input Gain DIGITAL FILTER XTALN FREQUENCY ASSESSMENT AND MEASUREMENT XTAL AND CLOCKS XTAL/ CLOCK
VDD /2 OPAMP OUT IRQN SEQUENCER AND COMPARATOR REPLY DATA CSN COMMAND DATA SERIAL CLOCK
TONE LIST 1 AND TONE LIST 2
C-BUS INTERFACE AND CONTROL LOGIC
The CMX823 Functional Block Diagram
Control and Data
Communication with, and control of, the CMX823 is via the C-BUS hardware and software serial interface.
Frequency Stability
Decode frequency stability is ensured by the use on an on-chip `clock' oscillator requiring an input from an external (3.58MHz) Xtal or clock source. Using this common `telecom' Xtal frequency will reduce the external circuitry requirement. Selectable decode bandwidth settings allow the reception of tones from less stable sources.
Power Requirements
With a voltage range of 2.7V to 5.5V, a low operating power requirement and a `zero-power' mode, the CMX823 is configurable for use in all types of tone communication paging products with many types of host C.
Tone Operations
Tone Detection
SIGNAL IN Decoder Input Level Setting FREQUENCY ASSESSMENT AND MEASUREMENT DIGITAL FILTER When the CMX823 detects the start of a valid in-band tone (a tone in the selected userdefined tone list) it generates an interrupt and VDD /2 reports, via its on-chip C-BUS interface, which tone was detected. At the end of that tone it OPAMP OUT produces another interrupt and reports NOTONE detected. This information is available, in several forms, to enable the host C to measure and interpret the tone and gap lengths according to the toneset requirements. These actions take place for each response/de-response action no matter what the length of the tone sequence.
SERIAL CLOCK SEQUENCER AND COMPARATOR C-BUS INTERFACE AND CONTROL LOGIC CSN IRQN COMMAND DATA REPLY DATA
Tone Parameters
Load Tone Parameters
Tone parameters are stored in one or both of the `tone lists'. The tone decode parameters for the selected list and group are sequentially retrieved and matched with those of the received signal to find a tone decode. Tone decode status changes are flagged in the Status Register.
Tone List 1
Location 0 1 2 3 . . . 30 31 Tone Group 1 2 Tone Parameters Location 0 1 2 3 . . . 30 31
Tone List 2
Tone Group 1 2
Tone Parameters
The parameters for decoding each tone in the tone list are stored separately. Two selectable lists are available; only one is accessed at any one time. List contents are preloaded by the host and are maintained during `table-switching' and `Zero-Power' mode powersave operations. Tone decode parameters can be designated, within a tone list, to either one or both tone-groups; these groups can be used to represent the first or second tones in a tone sequence. Upon reception and measurement of an input tone, the tone decode parameters of the selected group are sequentially retrieved from the selected list and compared with the decoded parameters. A match will result in the generation of an interrupt and the decoded tone's status and parameters.
Decoded Tone Location Register
Tone Position in Selected List
Decoded Tone Parameters Register
Tone Group Tone Parameters (as loaded)
Status Register
Tone Change Decode Status Change Tone Decode Unlisted Tone tone and decode indications and parameters available to the host C
Tone Lists, Indications and Parameters Decode Tone Bandwidths
These bandwidth settings, variable between 0.1% to 3.1%, are available for compliance to all radio signalling and toneset specifications. These settings can be also used to `tune' the decode process by preventing false decoding due to `bandwidth overlap' and to enable the accurate reception of unstable Rx signals.
Tone Lists and Groups
The CMX823 contains two `tone lists' (1 and 2) each capable of storing parameters for thirty-two user-designated tones. Each list can be further sub-divided into two `tone groups'. Each `tone list' is intended for use with a single RF channel allowing a fast list-switch (between 1 and 2) when changing RF channels. Tone decode parameters can belong to either or both `tone groups'; a feature which may be used to represent the first and second tones in a tone sequence; this will further speed-up the decoding process.
Decode Reporting
To enable further efficiency and speed in tone decode reporting to the host, the Status Register indicates, separately, the various decode actions. Tone Change: Unlisted Tone: NOTONE: Tone List: Whenever a `listed' tone-decode changes The decoding of any tone in the valid frequency range but not in the selected list. The loss of a valid tone. An automatic NOTONE timer period is instigated. The list that was selected when the match was found.
Fast and Slow Measurement Modes
These two modes of response/de-response time measurement are available to allow the most efficient use of C time and to facilitate the widest range of paging tone-set format requirements. Fast mode is intended for 5/6-tone paging tonesets and Slow mode for 2-tone paging tonesets where slower response times are acceptable. For bespoke systems, these modes can be employed for the reduction of false decodes.
Decode Status Change: Any change in the decoder operation
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Member Companies
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COMMUNICATION SEMICONDUCTORS
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COMMUNICATION SEMICONDUCTORS
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Decodes Signals Through The Noise Floor!
Packages CMX823E4 CMX823P3 -40 to +85C 16-pin plastic TSSOP 16-pin plastic DIL
CML Microcircuits (Singapore)PteLtd
COMMUNICATION SEMICONDUCTORS
Singapore No. 2 Kallang Pudding Road, #09 - 05/06 Mactech Industrial Building, Singapore 349307 Tel: +65 67450426 Fax: +65 67452917 sg.sales@cmlmicro.com www.cmlmicro.com Shanghai No. 218, Tian Mu Road West, Tower 1, Unit 1008, Shanghai Kerry Everbright City, Zhabei, Shanghai 200070, China Tel: +86 21 63174107 and +86 21 63178916 Fax: +86 21 63170243 cn.sales@cmlmicro.com.cn www.cmlmicro.com
Information
www.cmlmicro.com/products/twoway/CMX823.htm
(c) 2003 CML Microcircuits

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