AD1833ACST

Overview

The AD1833ACST is a six-channel, 24-bit digital-to-analog converter (DAC) from Analog Devices, housed in a 48-lead LQFP package. It supports sample rates of 96 kHz across all channels and 192 kHz on two channels. Key electrical specifications include a dynamic range of 107 dB and a signal-to-noise ratio of 110 dB. The device operates with analog and core digital supplies between 4.5 V and 5.5 V, while the interface supply ranges from 3.3 V to DVDD1. It features multibit sigma-delta modulation, on-chip volume control, and flexible serial data interfaces including I2S, left-justified, right-justified, and DSP modes.

Feature Summary

• Six audio playback channels with 24-bit resolution and up to 192 kHz sampling capability on two channels.
• Multibit sigma-delta modulators with data-directed scrambling for reduced idle tones and noise floor.
• On-chip clickless mute and 1024-step linear scale volume control per channel via SPI.
• Flexible serial data port supporting I2S, left-justified, right-justified, DSP, packed, and TDM modes.

Applications

• DVD Video and Audio Players
• Home Theater Systems
• Automotive Audio Systems
• Set-Top Boxes
• Digital Audio Effects Processors

Procurement Notes

The AD1833ACST is classified as obsolete by the manufacturer. Verification of current availability requires checking distributor inventories for remaining stock or evaluating replacement components. Ensure that any sourced units meet the specified industrial temperature range of -40°C to +85°C and verify RoHS compliance status through official documentation.

Selection Notes

Select the AD1833ACST for applications requiring high-channel-count audio conversion with differential outputs. The 'C' suffix denotes the industrial temperature grade (-40°C to +85°C), distinct from the 'A' variant which may have different performance characteristics. Ensure the design accommodates the 48-lead LQFP package dimensions and provides separate analog (AVDD) and digital (DVDD2) power domains for optimal noise isolation.

Part Context

The AD1833ACST belongs to the AD1833A family of multichannel audio DACs. It shares the same functional architecture and pinout with the AD1833AASTZ, differing primarily in the temperature rating indicated by the ordering suffix. Both variants utilize the ST-48 low-profile quad flat package and are designed for high-performance digital audio playback systems requiring multiple synchronized channels.

Replacement Considerations

As an obsolete component, direct replacements must be evaluated based on pin compatibility and feature set. Potential substitutes should offer six-channel output, similar 24-bit resolution, and compatible serial interfaces. Verify that alternative devices support the required 192 kHz sample rate on at least two channels and fit within the 48-lead LQFP form factor if board space is constrained.

FAQ

What is the difference between the AD1833AAST and AD1833ACST?

Both models share the same functionality and package. The 'A' suffix typically indicates an automotive or specific commercial grade, while the 'C' suffix denotes the industrial temperature range of -40°C to +85°C as specified in the ordering guide.

How does the AD1833A handle jitter sensitivity?

The device uses multibit sigma-delta modulators with data-directed scrambling. This architecture makes the DACs least sensitive to jitter compared to traditional single-bit architectures, helping to reduce idle tones and lower the noise floor.

Can the AD1833ACST operate with a 3.3V digital interface?

Yes, the AD1833ACST features a separate digital interface supply pin (DVDD2) that allows it to interface with 3.3V logic devices, while the core logic and analog sections operate from a 5V supply (DVDD1/AVDD).