AD1835AASZ

Overview

The AD1835AASZ is a high-performance stereo audio codec featuring two analog-to-digital converters and eight digital-to-analog converters. It supports sample rates up to 96 kHz for both ADCs and DACs, with the first DAC capable of 192 kHz operation. The device utilizes 24-bit resolution and multibit Sigma-Delta modulators to achieve a typical dynamic range of 105 dB for ADCs and 108 dB for DACs. It operates on 5 V analog and digital supplies (4.5 V to 5.5 V) with a 3.3 V tolerant digital interface. The component is housed in a 52-lead MQFP package and functions within an industrial temperature range of -40°C to +85°C.

Feature Summary

• Multibit Sigma-Delta modulation technology ensures perfect differential linearity restoration, reducing idle tones and noise floor.
• Integrated digital volume controls provide 1024-step linear scale adjustment per channel with software-controllable clickless mute functions.
• Flexible serial data port supports multiple formats including I2S, left-justified, right-justified, and DSP modes, alongside TDM interface capabilities.
• On-chip reference voltage and digital de-emphasis processing enhance signal integrity and system performance.

Applications

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

Procurement Notes

Verify the specific suffix 'Z' indicates lead-free compliance when sourcing replacements. Confirm the package type matches the 52-lead MQFP specification. Ensure the operating temperature range meets the -40°C to +85°C requirement for industrial applications. Check for availability as the part status may vary across distributors.

Selection Notes

Select this component for systems requiring four independent stereo DAC outputs and one stereo ADC input. Verify that the host processor supports the required serial interface modes such as I2S or TDM. Ensure the power supply design accommodates separate 5 V analog and digital rails with appropriate bypassing. Consider the clock jitter specifications if high-fidelity audio performance is critical.

Part Context

The AD1835AASZ belongs to the Analog Devices AD1835 family of high-performance audio codecs. It is designed for professional and consumer audio applications requiring high channel count and low distortion. The 'A' variant specifies the industrial temperature range, while the 'S' denotes the plastic MQFP package. This component integrates advanced digital filtering and modulation technologies for superior audio quality.

Replacement Considerations

Direct substitutes include the AD1835AAS and AD1835AAS-REEL from Analog Devices. These variants share identical electrical characteristics and pinouts. Verify that any replacement maintains the 52-lead MQFP package form factor and industrial temperature rating.

FAQ

What is the maximum sample rate supported by the DACs?

The AD1835A supports sample rates up to 96 kHz for all DAC channels. However, DAC 1 specifically supports a sample rate of 192 kHz.

How does the device handle digital volume control?

Each DAC channel includes an on-chip volume control with 1024 linear steps. The attenuation range is 60 dB, and it features software-controllable clickless mute functionality.

What serial interface formats are supported?

The flexible serial data port supports Right-Justified, Left-Justified, I2S Compatible, and DSP Serial Port modes. It also supports a TDM Interface Mode for 8-in/8-out operations.