AD9912ABCPZ

Overview

The AD9912ABCPZ is a Direct Digital Synthesizer (DDS) featuring an integrated 14-bit digital-to-analog converter (DAC). It operates with an internal clock speed of 1 GSPS, supporting direct output frequencies up to 400 MHz. The device utilizes a 48-bit frequency tuning word (FTW), enabling frequency resolution down to 4 μHz. Power supplies include DVDD and AVDD at 1.8 V, and DVDD_I/O and AVDD3 at 3.3 V. It functions within an industrial temperature range of -40°C to +85°C and is housed in a 64-lead LFCSP package.

Feature Summary

• Integrated 14-bit DAC with 48-bit frequency tuning word for high-resolution synthesis
• On-chip low noise PLL REFCLK multiplier accepting inputs as low as 25 MHz
• Dual SpurKiller channels for harmonic spur reduction
• Low jitter clock doubler supporting frequencies up to 750 MHz

Applications

• Agile LO frequency synthesis
• Low jitter, fine tune clock generation
• Test and measurement equipment
• Wireless base stations and controllers
• Secure communications

Procurement Notes

Verify the component against official Analog Devices documentation to confirm pinout compatibility and electrical specifications. Ensure that the serial I/O control interface matches the system requirements. Check for moisture sensitivity handling procedures prior to assembly. Confirm that the thermal resistance characteristics align with the target PCB layout design.

Selection Notes

Select this component when precise frequency agility and low phase noise are required. The integrated DDS architecture allows for rapid frequency hopping without external synthesizers. Consider the available HSTL and CMOS output drivers for different interface voltage levels. Evaluate the power consumption profiles across various operating modes to optimize system efficiency.

Part Context

This part belongs to the AD9912 series of Direct Digital Synthesizers from Analog Devices. It shares core architectural features with other members of the family but is distinguished by its specific packaging and operational parameters. The AD9912ABCPZ variant provides a robust solution for applications demanding high spectral purity and flexible clock generation capabilities.

Replacement Considerations

AD9912

FAQ

What is the maximum output frequency for the DDS?

The theoretical upper bound is 50% of the sampling clock frequency (fs), though a practical limit of 40% fs is recommended to accommodate reconstruction filter selectivity.

How does the device handle system clock inputs?

It accepts flexible system clock inputs via crystal or external reference clock, utilizing an on-chip low noise PLL multiplier to generate higher frequencies from lower input rates.

What is the purpose of the FDBK_IN inputs?

The FDBK_IN inputs allow the filtered DAC output signal to be fed back into the chip for further processing through the output circuitry, such as the HSTL or CMOS drivers.