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ad1847

Serial-Port 16-Bit SoundPort Stereo Codec

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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 +5V 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 Sigma Delta analog-to-digital converters (ADCs) and a stereo pair of Sigma Delta 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.

The Sigma Delta DACs are procceded by a digital interpolation filter. An attenuator provides independent user volume control over each DAC channel. Nyquist images are removed fom the DACs' analog stero output by on-chip switched-capacitor and continuous-time filters. Two stero pairs of auxiliary line-level inputs can also be mixed in the analog domain with the DAC output.

The AD1847 serial data interface uses a Time Division Multiplex (TDM) scheme that is compatible with DSP serial ports configured in Multi-Channel Mode with 32 16-bit time slots (i.e., SPORT0 on the ADSP-2101, ADSP-2101, ADSP-2115, ext.).

 

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ADI公司所提供的资料均视为准确、可靠。但本公司不为用户在应用过程中侵犯任何专利权或第三方权利承担任何责任。技术指标的修改不再另行通知。本公司既没有含蓄的允许,也不允许借用ADI公司的专利或专利权的名义。本文出现的商标和注册商标所有权分别属于相应的公司。

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