AD1837AAS

Overview

The AD1837AAS is a high-performance single-chip audio codec manufactured by Analog Devices Inc. It features four stereo digital-to-analog converters (DACs) and one stereo analog-to-digital converter (ADC). The device supports sample rates up to 96 kHz, with 192 kHz available on one DAC channel. It utilizes multibit Sigma-Delta modulators for high fidelity, offering 24-bit resolution. Key specifications include –95 dB THD+N for ADCs and –92 dB THD+N for DACs. The codec operates from a 5 V supply with a 3.3 V tolerant digital interface and is housed in a 52-lead MQFP package.

Feature Summary

• Multibit Sigma-Delta modulation technology with perfect differential linearity restoration to reduce idle tones and noise floor.
• Data directed scrambling DACs designed to minimize sensitivity to clock jitter.
• On-chip volume controls per channel with 1024-step linear scale and software-controllable clickless mute functions.
• Flexible serial data port supporting right-justified, left-justified, I2S compatible, and DSP serial port modes.

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 when purchasing. The 'Z' suffix indicates a lead-free component, while other suffixes may denote reel packaging options. Confirm that the part number matches the required industrial temperature range of –40°C to +85°C. Ensure compatibility with the 52-lead MQFP plastic package specification during procurement to avoid form-factor mismatches.

Selection Notes

Select this component for systems requiring multiple independent stereo DAC outputs from a single chip. It is suitable for designs needing a 3.3 V tolerant digital interface alongside a 5 V analog supply. Consider the TDM interface mode if interfacing with a SHARC DSP is required. Verify that the master clock requirements align with the supported 256x, 512x, or 768x fS ratios.

Part Context

The AD1837AAS belongs to the AD1837 family of audio codecs from Analog Devices. This series is engineered for high-channel-count audio applications where space efficiency is critical. The device integrates complex digital filtering and modulation engines into a compact surface-mount package, serving as a central conversion hub for multi-channel audio processing architectures.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Check the manufacturer's official cross-reference guides for potential alternatives.