AD9953YSV

Overview

The AD9953YSV is a direct digital synthesizer (DDS) featuring a 14-bit DAC operating up to 400 MSPS. It generates frequency-agile analog output sinusoidal waveforms at up to 200 MHz using advanced DDS technology. The device includes an integrated 1024 × 32 static RAM for flexible frequency sweep capability and supports fast frequency hopping with fine tuning resolution via a 32-bit frequency tuning word. Frequency tuning and control words are loaded via a serial I/O port. The component operates over the extended industrial temperature range of –40°C to +105°C.

Feature Summary

• Integrated 14-bit DAC with high-speed operation
• Internal oscillator driven by a single crystal
• PLL REFCLK multiplier supporting 4× to 20× multiplication
• Multichip synchronization capability

Applications

• Agile VHF/UHF LO frequency synthesis
• FM chirp source for radar and scanning systems
• Nonlinear-shaped PSK/FSK modulator
• Test and measurement equipment

Procurement Notes

Verify the specific ordering suffix against official documentation, as it determines package type and temperature grade. Confirm that the DVDD_I/O pin voltage matches the system interface requirements, as the datasheet specifies support for both 1.8 V and 3.3 V logic levels. Ensure proper termination of the differential DAC outputs to AVDD rather than AGND to maintain compliance and prevent distortion.

Selection Notes

Select this component when a digitally programmable high-frequency synthesizer with integrated memory is required. The internal PLL allows flexibility in reference clock selection, supporting frequencies from 4 MHz to 400 MHz depending on the multiplier setting. Consider the 48-lead TQFP/EP package for board layout constraints and ensure adequate thermal management given the power consumption specifications.

Part Context

The AD9953 belongs to Analog Devices' Direct Digital Synthesis family, designed for applications requiring precise frequency agility and low phase noise. It integrates a high-performance DAC and a 32-bit phase accumulator to generate clean sinusoidal waveforms. The inclusion of onboard RAM enables complex waveform generation and frequency sweeping without external processor intervention during execution.

Replacement Considerations

Public confirmed substitute part numbers: AD9951, AD9952, AD9954.