AD9838BCPZ-RL

Overview

The AD9838BCPZ-RL is a low-power Direct Digital Synthesis (DDS) device from Analog Devices, packaged in a 20-lead LFCSP_WQ. It operates on a 2.3 V to 5.5 V supply and consumes 11 mW at 2.3 V. The B-grade variant supports a master clock speed of 16 MHz, enabling an output frequency up to 8 MHz with 0.06 Hz resolution. Key specifications include a 10-bit DAC, -64 dB SNR, and -64 dBc THD. It features a 3-wire SPI interface, independent analog/digital supplies, and an extended temperature range of −40°C to +125°C.

Feature Summary

• Produces high-performance sinusoidal and triangular waveforms via a 10-bit DAC.
• Includes an on-board comparator for generating square wave clock outputs.
• Supports frequency and phase modulation through serial register loading or hardware pins.
• Features independent power supplies for analog and digital sections to optimize noise performance.

Applications

• Frequency stimulus and waveform generation
• Low power RF and communications systems
• Liquid and gas flow measurement
• Sensory applications including proximity, motion, and defect detection
• Test and medical equipment

Procurement Notes

Verify the specific grade suffix 'B' corresponds to the required 16 MHz MCLK speed. Confirm the 'RL' suffix indicates reel packaging. Ensure the LFCSP_WQ package thermal requirements are met by the PCB layout. Check for RoHS compliance status as per the latest manufacturer documentation before finalizing orders.

Selection Notes

Select the AD9838BCPZ-RL when a 16 MHz update rate is necessary for higher output frequencies or finer resolution compared to the A-grade version. Consider the 10-bit resolution and current output nature of the DAC when designing external load circuits. Evaluate the need for the internal comparator if a digital clock signal is required directly from the DDS output.

Part Context

The AD9838 belongs to the Analog Devices AD983x series of complete DDS solutions. It shares functional similarities with the AD9837 but offers higher clock speeds and integrated features like the on-board comparator. The BC part number specifically denotes the industrial temperature grade and B-speed binning for the 16 MHz operation capability.

Replacement Considerations

The AD9838ACCPZ-RL is a compatible alternative offering a 5 MHz MCLK speed. For higher performance requirements, the AD9837 may be considered, though it lacks the integrated comparator found in the AD9838. Verify pin compatibility and software register configurations when substituting within the AD983x family.