RF Building Blocks
CMX972 – Quadrature Demodulator with IF PLL VCO
The CMX972 features a low-power quadrature IF/RF demodulator with wide operating frequency range and optimised power consumption.
The demodulator is suitable for superheterodyne architectures with IF frequencies up to 300MHz and may be used in low IF systems or in those converting down to baseband.
An on-chip PLL and VCO, together with uncommitted baseband differential amplifiers, provide additional flexibility. Control of the CMX972 is by serial bus.
The small, RF-optimised 32-pin VQFN package and minimal external components make the device ideal for space-constrained applications.
Devices are available through our Distributor Network.
Features
- 20 – 300MHz IF/RF Demodulator
- 10MHz Rx I/Q Bandwidth
- < 1 degree I/Q Phase Matching
- < 0.5 dB I/Q Gain Matching
- IF PLL and VCO amp
- Low Power 24mA @ 3.3V
- Small 32-lead VQFN Package
Applications
- Wireless Data Terminals
- HF/VHF and UHF Mobile Radio
- Avionics Radio Systems
- Software Defined Radio (SDR)
- Satellite Terminals
Power Supply Requirement
- 3.0 to 3.6 V power supply
Design Resources
Frequency Estimation for a VCO using a Negative Resistance Amplifier |
Frequency Estimation for a VCO using a Negative Resistance Amplifier |
View |
Excel Spreadsheet - Frequency Estimation for a VCO using a Negative Resistance Amplifier |
An Excel spreadsheet that calculates the operating frequency of VCO designs using a negative resistance amplifier. An Application Note describing the process is available above. | View |
| EV9720 | The EV9720 is designed for evaluating and demonstrating the capabilities of the CMX972. The EV9720 provides all of the necessary circuits for the IC such as power supply regulators and matching circuits etc. | EV9720_Product_Preview
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C-BUS Guides |
Guides to operation and interfacing | Download |
EV9720 Board Schematics |
EV9720 high resolution schematics. Version A02 |
Download |
EV9720 Evaluation Software |
EV9720 Evaluation Software. Requires a PE0003 Universal Interface Card. Version 3.1 |
Download |
PE0003 Driver |
PE0003 USB driver for Windows. Version 1.0 |