AD1835A

NOT RECOMMENDED FOR NEW DESIGNS

2 ADC, 8 DAC, 96 kHz, 24-Bit Sigma Delta Codec

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Overview

  • 5 V Stereo Audio System with 3.3 V Tolerant Digital Interface
  • Supports up to 96 kHz Sample Rates
  • 192 kHz Sample Rate available on one DAC
  • Supports 16-/20-/24-Bit Word Lengths
  • Multibit Sigma-Delta Modulators with "Perfect Differential Linearity Restoration"
  • Data Directed Scrambling DACs -Least Sensitive to Jitter
  • Differential Output for Optimum Performance
  • ADCs: -95 dB THD +N, 105 dB SNR and Dynamic Range
  • DACs: -95 dB THD +N, 108 dB SNR and Dynamic Range
  • On-Chip Volume Controls Per Channel with 1024 Step Linear Scale
  • DAC and ADC Software Controllable Clickless Mutes
  • Digital De-Emphasis Processing
  • Supports 256 x fS, 512 x fS, and 768 x fS Master Mode Clocks
  • Power-Down Mode Plus Soft Power-Down Mode

The AD1835A is a high-performance single-chip CODEC featuring four stereo DACs and one stereo ADC.

Each DAC comprises a high-performance digital interpolation filter, a multi-bit sigma-delta modulator featuring Analog Devices patented technology and a continuous-time voltage out analog section. Each DAC has independent volume control and clickless mute functions. The ADC comprises two 24-bit conversion channels with multi-bit sigma-delta modulators and decimation filters.

The AD1835A also contains an on-chip reference with a nominal value of 2.25 V.

The AD1835A contains a flexible serial interface that allows for glueless connection to a variety of DSP chips, AES/EBU receivers and sample rate converters. The AD1835A can be configured in Left-Justified, Right-Justified, I2S or DSP compatible serial modes. Control of the AD1835 is achieved by means of an SPI compatible serial port. While the AD1835A can be operated from a single 5 V supply, it also features a separate supply pin for its digital interface, which allows the device to be interfaced to other devices using 3.3 V power supplies.

The AD1835A is available in a 52 Lead MQFP package and is specified for the industrial temperature range of -40ºC to +85ºC.

APPLICATIONS

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

AD1835A
2 ADC, 8 DAC, 96 kHz, 24-Bit Sigma Delta Codec
AD1835A Functional Block Diagram
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