High Performance RF Synthesizer CMX940
CML Microcircuits
The CMX940 from CML Microcircuits is a low-power high performance Fractional-N PLL with fully-integrated wideband VCO and programmable output divider, generating RF signals over a continuous frequency range of 49 MHz to 2040 MHz.
It has two level-controlled single-ended RF outputs to support Tx and Rx sub-systems. A highly-configurable near noiseless clock multiplier can be used to minimise close-in phase noise and mitigate integer and fractional boundary spurious. The chip configuration is controlled by an SPI-compatible C-BUS serial interface.
Available in a 7 x 7 mm LGA-48 package, the CMX940 reduces component count and PCB board area, requiring only external loop filter and clock reference to provide a complete and very compact RF synthesizer solution.
Low operating voltage and low power consumption make it the perfect choice for a wide variety of portable and battery powered wireless applications, including digital narrowband two-way radio equipment compliant with ETSI PMR co-existence standards applicable under the Radio Equipment Directive.
Product Features | CMX940
Fully Integrated VCO
RF output frequency 49 – 2040 MHz
Low current consumption 45 – 55 mA
Supply voltage 3.0 – 3.6 V
Low 1 Hz normalised PLL noise floor of -225 dBc/Hz
Typical phase noise -123 dBc/Hz, 25 kHz offset at 435 MHz
Dual programmable RF outputs
Low noise VCO -142 dBc/Hz, 1 MHz offset at 435 MHz
Automatic VCO selection and calibration
16 and 24-bit fractional-N PLL modes
Digital lock detect
High comparison frequency up to 120 MHz
Compatible with EN 300 113, EN 300 086
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