RF Building Blocks
CMX994EF - RF Direct Conversion Receiver IC
The CMX994EF replaces the prior generation of direct conversion receiver ICs from CML Micro. CMX994EF has improved PowerTrade™, the ability to dynamically select power vs. performance modes to optimise operating trade-offs. The CMX994EF includes 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 multiband operation. The devices operate from a single 3.3 V supply over a temperature range of –40°C to +85°C and are available in a small 40-pin VQFN (Q4) package.
The CMX994EF includes all the advanced features of the CMX994A and CMX994E including the enhanced performance mode. The CMX994EF has a better transient response on power up/down allowing faster switching on/off allowing improved power-saving capability and operation in TDMA systems, improved LNA performance at frequencies >600 MHz and reduced power consumption specifically at higher operating frequencies.
Devices are available through our Distributor Network.
Features
- Replacement for Direct conversion receiver family
- CMX994 - Standard and low power mode
- CMX994A - Standard and additional low power modes
- CMX994E - Enhanced, standard and low power modes
- CMX994G - Enhanced, 30 MHz guaranteed performance
- Rx single conversion to zero IF, near-zero IF or low IF; zero IF eliminates image responses
- Very high mixer IIP2 for practical zero IF receiver
- 100 MHz to 1 GHz I/Q demodulator
- Extended operation down to 30 MHz
- LNA with gain control
- 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
- Precise filtering with 1:2:4 bandwidth select control
- Small size 40-pin VQFN Package
Applications
- Analogue/digital multi-mode radio
- Software Defined Radio (SDR)
- Data telemetry modems
- Satellite communications
- Constant envelope and linear modulation
- Rx function compatible with CMX998 Cartesian Feedback Loop Transmitter
- Narrowband e.g. 25 kHz, 12.5 kHz, 6.25 kHz
- Wideband Data e.g. >1 MHz bandwidth
Power Supply Requirement
- 3.0 to 3.6 V
Downloads
Design Resources
| EV9942EF | This Evaluation Kit allows the user to investigate all aspects of the CMX994EF, high-performance direct conversion receiver. A common PC-based application identifies the CMX994EF version and starts an interactive GUI for configuration and control. A separate hi-res schematic is available. |
S-parameter Files
CMX994EF LNA (50 and 100 ohm mode) 2-port s-parameter file and Rx Mixer Input 1-port s-parameter file to enable linear simulations to be performed.
Schematics
EV9942EF Evaluation kit high resolution schematics - version A02
EV9942EF BOM
EV9942EF Evaluation kit bill of materials - version A02
EV9942EF Evaluation Software
A GUI-based application for the EV9942EF Evaluation Kit. A PE0003 Universal Interface Card is required to use this application (sold separately). Version 4.1