AD9840JSTRL

Overview

The AD9840JSTRL is a complete, high-performance direct digital synthesizer (DDS) manufactured by Analog Devices Inc. It integrates a high-speed 12-bit DAC, a programmable waveform generator, and a flexible clocking system on a single chip. The device supports data rates up to 150 MSPS and features a wide dynamic range with low spurious content. It includes an integrated sine/cosine lookup table and allows for frequency and phase modulation via serial or parallel interfaces. The component is housed in a 28-lead SSOP package and operates within a specified industrial temperature range.

Feature Summary

• Integrates a high-speed 12-bit current-output DAC with a built-in sine/cosine look-up table for direct waveform generation.
• Supports flexible clocking options including internal oscillator input and external clock sources up to 150 MHz.
• Provides multiple interface modes including 8-bit/16-bit parallel and 3-wire serial control for easy microprocessor integration.

Applications

• Direct Digital Synthesis (DDS) signal generators
• Frequency and phase modulators for communication systems
• Test and measurement equipment requiring precise frequency control

Procurement Notes

Verify the specific suffix JSTRL against the manufacturer's official datasheet to confirm the tape-and-reel packaging configuration and temperature grade. Ensure compatibility with existing PCB footprints for the 28-lead SSOP package. Confirm lead-free status and RoHS compliance requirements with the supplier prior to ordering.

Selection Notes

Select this component when a monolithic solution for DDS applications is required, eliminating the need for separate waveform generators and DACs. Consider the 12-bit resolution and 150 MSPS update rate for bandwidth requirements. Evaluate the power consumption specifications against system thermal constraints and verify that the supply voltage ranges match the design architecture.

Part Context

The AD9840 belongs to Analog Devices' family of direct digital synthesizers designed for high-frequency signal generation. It serves as a key building block in modern RF and baseband systems where tunable oscillators are needed. The JSTRL designation indicates a specific reel-based packaging variant intended for automated surface-mount assembly processes.

Replacement Considerations

Check for updated versions such as the AD9844 or AD9850 which may offer higher resolution or speed. Verify pin-to-pin compatibility if substituting with other DDS devices from different manufacturers. Ensure that any replacement maintains the same interface protocol and supply voltage requirements.