The CMX823
Simple, Versatile, Efficient and Fast
Specification
Supply Voltage Range
Operating Current (typ.)
V
DD
= 2.7V
V
DD
= 5.0V
Zero Power Current
V
DD
= 2.7V
V
DD
= 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
1.0µA
1.0µA
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.
V
SS
V
DD
SIGNAL IN
Input
Gain
DIGITAL FILTER
XTALN
FREQUENCY
ASSESSMENT AND
MEASUREMENT
XTAL
AND
CLOCKS
XTAL/ CLOCK
V
DD
/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 µC.
CMLMICRO [ CML MICROCIRCUITS ]
