Analog Devices introduced the AD9528 JESD204B clock and SYSREF generator defined to support the clock requirements for long-term evolution (LTE) and multicarrier GSM base station designs, defence electronics systems, RF test instrumentation, and other emerging wideband RF data acquisition signal chains in the giga-sample per second (GSps) range.
The use of the JESD204B standard for the high-speed converter-to-digital processor interface is becoming increasingly prevalent across many state-of-the-art applications as data rates are being pushed into the multi-Gbps range, and multi-channel synchronisation and data latency management are becoming a system necessity. The JESD204B interface was specifically developed to address high-data-rate system design needs, and the AD9528 contains functions that support and enhance the unique capabilities of that interface standard.
The IC provides a low-power, multi-output clock distribution function with low-jitter performance, along with an on-chip, two-stage PLL and VCO. The on-chip VCO tunes from 3,6 GHz to 4,0 GHz, with the input receivers and oscillator providing both single-ended and differential operation.
The AD9528 provides JESD204B-compatible subclass 1 SYSREF and deterministic latency clocking signals and supports a variety 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 chip is also capable of generating the SYSREF source internally.
The AD9528 supports both continuous signal SYSREF generation and ‘n-shot’ pulse generation. The latter is vital in systems where a continuous signal might result in unwanted spurs in the output spectrum of the data converter being clocked.
When connected to a recovered system reference clock and a VCXO, the AD9528 generates 12 low-noise outputs with a range of 1 MHz to 400 MHz, and two high-speed outputs at up to 1,25 GHz. 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.
For more information contact Kevin Godfrey, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected], www.arrow.altech.co.za
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