AD1838AS

Overview

The AD1838AS is a high-performance single-chip audio codec featuring three stereo DACs and one stereo ADC. It supports sample rates up to 96 kHz, with 192 kHz available on one DAC channel. The device operates from a 5 V supply with a 3.3 V tolerant digital interface. Key specifications include 24-bit resolution, –95 dB THD+N for both ADC and DAC channels, and 105 dB dynamic range for the ADC. It includes on-chip volume controls with 1024 linear steps, software-controllable clickless mutes, and flexible serial data ports compatible with I2S, DSP, and TDM modes.

Feature Summary

• Multibit Sigma-Delta modulators with perfect differential linearity restoration
• Flexible serial interface supporting multiple data formats
• On-chip reference voltage generation
• Independent volume control per channel

Applications

• DVD Video and Audio Players
• Home Theater Systems
• Automotive Audio Systems
• Audio/Visual Receivers
• Digital Audio Effects Processors

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current catalog to ensure correct package and temperature range. Confirm that the component matches the industrial temperature specification of -40°C to +85°C. Check for any recent revisions or updates to the datasheet that may affect pin compatibility or electrical characteristics before finalizing procurement.

Selection Notes

Select this component when a system requires multiple independent stereo outputs from a single codec chip. Ensure the host processor supports the required serial interface modes, such as I2S or TDM. Verify that the power supply architecture can provide separate analog and digital 5 V rails to minimize noise coupling. Consider the 52-lead MQFP package size during PCB layout planning.

Part Context

The AD1838AS belongs to Analog Devices' high-performance audio codec family designed for professional and consumer audio applications. It is part of a series that includes variants like the AD1839, which offers similar functionality but may differ in specific interface options or performance metrics. This component is engineered for systems requiring high fidelity and low distortion in multi-channel audio processing.

Replacement Considerations

The AD1838AS-REEL is the reel-packaged version of the same component. No direct cross-model replacements are confirmed in the provided documentation. Any substitute must match the 52-lead MQFP package, 5 V operation, and 24-bit resolution requirements.

FAQ

What is the maximum sample rate supported by the AD1838AS?

The AD1838AS supports sample rates up to 96 kHz for all channels. One DAC channel can operate at 192 kHz.

How many independent volume controls does the AD1838AS have?

Each of the six DAC channels has an independent volume control with 1024 linear steps.

What is the common-mode output voltage for the DACs?

The common-mode output voltage for each DAC channel is 2.25 V.