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Product Descriptions

The AD1847 SoundPort? Stereo Codec integrates key audio data conversion and control functions into a single integrated circuit. The AD1847 is intended to provide a complete, low cost, single-chip solution for business, game audio and multimedia applications requiring operation from a single +5 V supply. It provides a serial interface for implementation on a computer motherboard, add-in or PCMCIA card. See Figure 1 for an example system diagram.

External circuit requirements are limited to a minimal number of low cost support components. Anti-imaging DAC output filters are incorporated on-chip. Dynamic range exceeds 70 dB over the 20 kHz audio band. Sample rates from 5.5 kHz to 48 kHz are supported from external crystals.

The Codec includes a stereo pair of ∑? analog-to-digital converters (ADCs) and a stereo pair of ∑? digital-to-analog converters (DACs). Inputs to the ADC can be selected from four stereo pairs of analog signals: line 1, line 2, auxiliary (“aux”) line #1, and post-mixed DAC output. A software-controlled programmable gain stage allows independent gain for each channel going into the ADC. The ADCs’ output can be digitally mixed with the DACs’ input.

The pair of 16-bit outputs from the ADCs is available over a serial interface that also supports 16-bit digital input to the DACs and control/status information. The AD1847 can accept and generate 16-bit twos-complement PCM linear digital data, 8-bit unsigned magnitude PCM linear data, and 8-bit μ-law or A-law companded digital data.

Product Features

• Single-Chip Integrated SD Digital Audio Stereo Codec

• Supports the Microsoft Windows Sound System*

• Multiple Channels of Stereo Input

• Analog and Digital Signal Mixing

• Programmable Gain and Attenuation

• On-Chip Signal Filters

• Digital Interpolation and Decimation

• Analog Output Low-Pass

• Sample Rates from 5.5 kHz to 48 kHz

• 44-Lead PLCC and TQFP Packages

• Operation from +5 V Supplies

• Serial Digital Interface Compatible with ADSP-21xx

• Fixed-Point DSP

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