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IF/RF Quadrature Demodulator

CMX970 - RF Building Block


Features:
  • 20 - 300 MHz IF/RF Demodulator with VGA
  • 10MHz I/Q Bandwidth
  • Serial Bus or Direct Control Operation
  • < 1 degree I/Q Phase Matching 
  • < 0.5 dB I/Q Gain Matching
  • Low Power 15mA @ 3.3V
  • Small 16-lead VQFN Package
Applications:
  • Wireless Data Terminals
  • HF/VHF and UHF Mobile Radio
  • Avionics Radio Systems
  • Software Defined Radio (SDR)
Supply Requirement:
  • 3.0 to 3.6 V power supply

The CMX970 is a low power IF or RF quadrature demodulator featuring a wide operating frequency range and low power consumption. Suitable for architectures with IF or RF frequencies up to 300MHz the device may be used in low IF systems or those converting down to baseband.

Control of the CMX970 may be either by serial bus or by direct control (with reduced functionality). The small, RF-optimised VQFN package and minimal external components make the device ideal for space-constrained applications. Programmable features include the local oscillator divider ratio (2 or 4).

The CMX970 may be used for conversion to low IF or zero IF (baseband). The demodulator has best in class intermodulation performance, excellent phase and amplitude balance and has two gain control elements which can be independently controlled, allowing users to optimise gain / noise / linearity characteristics depending on their system requirements.

The device can be controlled and configured via a serial bus or can operate in a direct control mode.

Block Diagram

CMX970 Block Image

Design Support Information

 
CMX970 Quadrature Demodulator Product Introduction Video
 
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