CMX994 Datasheet, PDF (1/61 Pages) CML Microcircuits – Local Oscillator

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
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