AD1955ARSZ

Overview

The AD1955ARSZ is a stereo digital-to-analog converter (DAC) from Analog Devices, housed in a 28-lead SSOP package. It supports 16-, 18-, 20-, and 24-bit data with sample rates up to 192 kHz. The device features a multibit sigma-delta modulator and an internal digital filter engine. Key performance metrics include a signal-to-noise ratio of 120 dB for stereo differential output at 48 kHz and -110 dB total harmonic distortion plus noise. It operates on a single 5 V supply, drawing approximately 42 mA total current.

Feature Summary

• Supports SACD playback via dedicated DSD bit stream interface and PCM audio formats up to 192 kHz.
• Multibit sigma-delta modulator with data-directed scrambling for low jitter sensitivity.
• On-chip clickless volume control and mute functionality managed via SPI serial port.
• Flexible serial data input compatible with I2S, left-justified, right-justified, and DSP modes.

Applications

• High-end DVD Audio systems
• Super Audio CD (SACD) players
• Home theater systems
• Automotive audio systems

Procurement Notes

Verify the specific suffix 'ARSZ' corresponds to the standard commercial temperature range (-40°C to +85°C) and lead-free packaging. Confirm that the required master clock frequencies align with the selected interpolation mode (INT 8x, 4x, or 2x) as defined in the specifications table.

Selection Notes

Select this component for applications requiring high-fidelity audio conversion with integrated filtering. Ensure the host system provides a stable 5 V analog and digital supply. Design external current-to-voltage converters using active op-amps, as passive conversion degrades performance. Verify compatibility with the source's serial data format and word length settings.

Part Context

This part belongs to the AD1955 series of high-performance audio DACs. It is designed for complete stereo playback systems, integrating the modulator, digital filters, and output drivers on a single chip. The device serves as a bridge between digital audio sources and analog amplification stages.

Replacement Considerations

The AD1955ARSRL is the reel-packaged equivalent of the tube-packed AD1955ARSZ. Both share identical electrical characteristics and pinouts. No functional substitutes are documented in the provided datasheet.

FAQ

What is the maximum supported sample rate for PCM audio?

The AD1955 supports PCM audio sample rates up to 192 kHz.

How does the device handle SACD data?

It accepts DSD bit streams through a dedicated serial port supporting both Normal Mode (64 fs) and Phase Modulation Mode (128 fs).

What is the typical power consumption?

Total dissipation is approximately 210 mW when operating with both analog and digital supplies connected.