Analog Devices' Low Jitter Frequency Synthesizers Enable GSPS Data Converter Solutions to Achieve Superior Performance

Beijing, China – Analog Devices, Inc. (ADI) has introduced the ADF4377, an 800MHz to 12.8GHz frequency synthesizer for high-performance ultra-wideband data converters and synchronization applications. This frequency synthesizer achieves excellent signal-to-noise performance by providing an ultra-clean clock source to drive the signal sampling process. Based on the ADF4377, a new generation of wideband receivers and transmitters can take advantage of a higher level of dynamic range, thereby improving receiver sensitivity and transmitter spectral purity. The ADF4377 frequency synthesizer has a normalized in-band phase noise as low as -239dBc/Hz, a normalized 1/f noise as low as -147dBc/Hz, and a wideband voltage-controlled oscillator (VCO) noise floor of -160dBc/Hz, which achieves a jitter level of less than 18fs rms to achieve such excellent performance.

ADF4377 frequency synthesizer It is suitable for applications that require multiple data converters or mixed signal front-end (MxFE) digitizers to work together, such as radar, instrumentation, wideband receivers, etc. The ADF4377 greatly simplifies the alignment and calibration procedures, allowing multiple groups of data converters to sample signals with precise timing alignment with each other, which is critical for the operation of the next generation of ultra-wideband multi-channel systems. This performance is achieved through the following features:

• Automatic reference output synchronization.

• Ultra-high matching of output delay references across process (3ps between devices), voltage, and temperature (0.03ps/C).

• Sub-picosecond, jitter-free output delay reference adjustment capability (+/- 0.1ps).

These features enable accurate and predictable multichip clock and SYSREF alignment. The ADF4377 frequency synthesizer, when used in conjunction with an IC that distributes the paired reference and SYSREF signals, supports both JESD204B and JESD204C Subclass 1 solutions. The ADF4377 integrates all necessary power supply bypass capacitors, saving space on compact circuit boards.

ADF4377 key features:

• Output frequency range: 800 MHz to 12.8 GHz

• Jitter = 18 fs rms (integrated bandwidth: 100 Hz to 100 MHz)

• Broadband noise floor: -160 dBc/Hz @ 12 GHz

• PLL Specifications:

-239 dBc/Hz: Normalized in-band phase noise floor

-147 dBc/Hz: Normalized in-band 1/f noise

oPhase detector frequency: up to 500 MHz

• Output delay specification reference:

oStandard deviation between devices: 3 ps

oTemperature drift: 0.03 ps/℃

oMulti -chip output phase alignment

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