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Clock IC from ADI aimed at GSPS data converter apps

Posted: 04 Dec 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Analog Devices? GSPS? data converter? ADC? clock IC?

Analog Devices Inc. (ADI) has rolled out the AD9528 that promises to provide a low-power, multi-output, clock distribution function with low-jitter performance, together with an on-chip, two-stage PLL and VCO. According to the company, the on-chip VCO tunes from 3.6-4GHz, with the input receivers and oscillator offering both single-ended and differential operation.

The device provides JESD204B-compatible subclass 1 SYSREF and deterministic latency clocking signals and supports a range of options for SYSREF signal generation. The most basic is a simple buffer function wherein the user-provided SYSREF signal is fanned out to the SYSREF output pins. When provided with an external SYSREF source, the AD9528 is also capable of synchronising the SYSREF outputs to the clock outputs being generated internally, which is necessary to achieve accurate deterministic latency. The AD9528 is also capable of generating the SYSREF source internally. The AD9528 supports both continuous signal SYSREF generation and "n-shot" pulse generation. N-shot generation is vital in systems where a continuous signal might result in unwanted spurs in the output spectrum of the data converter being clocked, noted the company.

AD9528

When connected to a recovered system reference clock and a VCXO, the AD9528 generates 12 low-noise outputs with a range from 1-400MHz, and two high-speed outputs at up to 1.25GHz. The frequency and phase of one clock output relative to another clock output can be varied by means of a divider phase-select function that serves as a jitter-free, coarse timing adjustment in increments that are equal to half the period of the signal coming from the VCO output. The SYSREF signals each have additional phase offset capability making it easy to dial-in the optimal arrival time at each target device.

The AD9528BCPZ is in full production and available in 72-lead LFCSP packaging for $8.25 each per 1,000 pieces. The AD9528/PCBZ evaluation board can be had for $190.

The AD9528 can be designed into wideband RF data acquisition applications with ADI's AD9680 dual-channel, 14bit, 1GSPS JESD204B ADC.





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