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CMX994A fiches techniques PDF

Consumer Microcircuits Limited - Direct Conversion Receivers

Numéro de référence CMX994A
Description Direct Conversion Receivers
Fabricant Consumer Microcircuits Limited 
Logo Consumer Microcircuits Limited 





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CMX994A fiche technique
CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX994/CMX994A/CMX994E
Direct Conversion Receivers
CMX994 / CMX994A (lower power consumption) / CMX994E (enhanced performance)
D/994_994A_994E/1 September 2015
DATASHEET
Provisional
Features
Applications
Direct conversion receiver family with PowerTrade™
Analogue/digital multi-mode radio
flexible power vs. performance modes
Software Defined Radio (SDR)
CMX994 - Standard and low power modes
Data telemetry modems
CMX994A - Standard and additional low power modes Satellite communications
CMX994E - Enhanced, standard and low power modes Constant envelope and linear modulation
Rx single conversion to zero IF, near-zero IF or low IF; zero Rx function compatible with CMX998
IF eliminates image responses
Cartesian Feedback Loop Transmitter
Very high mixer IIP2 for practical zero IF receiver
Narrowband e.g. 25kHz, 12.5kHz, 6.25kHz
100MHz to 1000MHz I/Q demodulator (CMX994A/E)
Wideband Data e.g. >1MHz bandwidth
100MHz to 940MHz I/Q demodulator (CMX994)
Extended operation down to 50MHz
LNA with gain control
Precise filtering with 1:2:4 bandwidth select control
Mixer Bandwidth up to 20MHz
Local Oscillator
LO synthesiser
VCO negative resistance amplifier
Rx LO divide by 2, 4 or 6 modes
Tx LO Output with divide by 1, 2, 4, or 6 modes
3.0V 3.6V Low power Operation
Small size 40-pin VQFN Package
I/Q Signals
CMX994
T/R
CMX994A
C-BUS
CMX994E
Reset
Ref. Osc. Direct Conversion Receiver Rx Enable
Tx LO
Tx Enable
Baseband
Signal Processing
µC Flash
1 Brief Description
The CMX994/CMX994A/CMX994E is a family of direct conversion receiver ICs with PowerTrade™, the ability
to dynamically select power vs. performance modes to optimise operating trade-offs. All three devices
include a broadband LNA with gain control followed by a high dynamic range, very high IIP2, I/Q
demodulator. The receiver baseband section includes amplifiers and precise, configurable bandwidth,
baseband filter stages. LO generation is provided by an integer-N PLL and a VCO negative resistance amplifier;
an external LO may also be used. LO dividers are provided for flexible multi-band operation. The devices
operate from a single 3.3V supply over a temperature range of 40°C to +85°C and are available in a small 40-
pin VQFN (Q4) package.
Relative to the CMX994 the CMX994A enables a significant reduction in power by allowing LO phase
correction to be turned off. A further reduction is made possible by the facility to disable either the I or Q
channel. The CMX994E expands on that by adding an enhanced performance mode that features improved
intermodulation in the receive path mixers.
2015 CML Microsystems Plc
Page 1 of 70
D/994_A_E/1

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