AD1938:  4 ADC/8 DAC with PLL, 192 kHz, 24-Bit CODEC

The AD1938 is a high performance, single-chip codec that pro-vides four analog-to-digital converters (ADCs) with input and eight digital-to-analog converters (DACs) with single-ended output using the ...More

AD1938:  4 ADC/8 DAC with PLL, 192 kHz, 24-Bit CODEC

Product Description

The AD1938 is a high performance, single-chip codec that pro-vides four analog-to-digital converters (ADCs) with input and eight digital-to-analog converters (DACs) with single-ended output using the Analog Devices, Inc., patented multibit sigma-delta (Σ-Δ) architecture. An SPI port is included, allowing a microcontroller to adjust volume and many other parameters.

The AD1938 operates from 3.3 V digital and analog supplies. The AD1938 is available in a 48-lead (single-ended output) LQFP package. Other members of this family include a diffe-rential DAC output and I2C® control port version.

The AD1938 is designed for low EMI. This consideration is apparent in both the system and circuit design architectures. By using the on-board PLL to derive the master clock from the LR clock or from an external crystal, the AD1938 eliminates the need for a separate high frequency master clock and can also be used with a suppressed bit clock. The DACs and ADCs are designed using the latest Analog Devices continuous time architectures to further minimize EMI. By using 3.3 V supplies, power consumption is minimized, further reducing emissions.

Applications

  • Automotive audio systems
  • Home Theater Systems
  • Set-top boxes
  • Digital audio effects processors

    • Features

    • PLL generated or direct master clock
    • Low EMI design
    • 108 dB DAC/107 dB ADC dynamic range and SNR
    • −94 dB THD + N
    • 3.3 V single supply
    • Tolerance for 5 V logic inputs
    • Supports 24 bits and 8 kHz to 192 kHz sample rates
    • Please see data sheet for additional features

    Diagrams

    AD1938 Diagram
    Functional Block Diagram for AD1938

    Specifications

    # ADC 4
    # DAC 8
    ADC Dynamic Range (dB) 107dB
    ADC SNR (dB) 107dB
    DAC Dynamic Range (dB) 108dB
    DAC SNR (dB) 108dB
    THD+N (dB) ADC: -94,DAC: -94
    Product Description 192 kHz 24-bit CODEC w/ PLL

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    Part# # ADC # DAC ADC Dynamic Range (dB) DAC Dynamic Range (dB) ADC SNR (dB) DAC SNR (dB) THD+N (dB) Product Description Price* (1000-4999)
    AD1935 4 8 107 106 107 106 ADC: -92, DAC: -92 192 kHz, 24 Bit CODEC with PLL and Regulator Driver, Single-Ended Output, SPI Control -
    AD1936 4 8 107 106 107 106 ADC: -92, DAC: -92 192 kHz, 24-Bit CODEC with PLL, Single-Ended Output, I2C Control -
    AD1937 4 8 107 109 107 109 ADC: -94, DAC: -94 192 kHz, 24-Bit CODEC with PLL, Differential Output, I2C Control $7.63
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