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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html><head> <title></title> <link rel="stylesheet" media="screen" type="text/css" href="./style.css" /> <link rel="stylesheet" media="screen" type="text/css" href="./design.css" /> <link rel="stylesheet" media="print" type="text/css" href="./print.css" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /></head><body><a href=start.html>start</a></br><div class="toc"><div class="tocheader toctoggle" id="toc__header">Table of Contents</div><div id="toc__inside"><ul class="toc"><li class="clear"><ul class="toc"><li class="level2"><div class="li"><span class="li"><a href="#ad1836a_audio_codec_card" class="toc">AD1836A Audio Codec Card</a></span></div><ul class="toc"><li class="level3"><div class="li"><span class="li"><a href="#description" class="toc">Description</a></span></div></li><li class="level3"><div class="li"><span class="li"><a href="#ad1836a" class="toc">AD1836A</a></span></div></li><li class="level3"><div class="li"><span class="li"><a href="#jumper_settings" class="toc">Jumper settings</a></span></div></li><li class="level3"><div class="li"><span class="li"><a href="#software_settings" class="toc">Software Settings</a></span></div></li><li class="level3"><div class="li"><span class="li"><a href="#using_i2s_mode" class="toc">Using I2S Mode</a></span></div></li></ul></li></ul></li></ul></div></div><h2><a name="ad1836a_audio_codec_card" id="ad1836a_audio_codec_card">AD1836A Audio Codec Card</a></h2><div class="level2"></div><!-- SECTION [1-36] --><h3><a name="description" id="description">Description</a></h3><div class="level3"><p> This daughter card implements both digital and analog audio input and output. It is based on the AD1836A chipset from Analog Devices. Two stereo inputs and three stereo outputs are provided with support for both mic and line level input. An S/P-DIF interface with transmit and receive capabilities is also provided. This daughter card connects to the STAMP board via the Serial Port Controller Interface (SPORT0 or SPORT1) connector. The <a href="http://blackfin.uclinux.org/frs/download.php/165/1836A_Schematics_v0-82.pdf" class="urlextern" title="http://blackfin.uclinux.org/frs/download.php/165/1836A_Schematics_v0-82.pdf" rel="nofollow">schematics</a> can be found on the <a href="http://blackfin.uclinux.org/frs/?group_id=7&release_id=78" class="urlextern" title="http://blackfin.uclinux.org/frs/?group_id=7&release_id=78" rel="nofollow">web site</a>.</p><p><a href="media/audio_codec_card.png" class="media" target="_blank" title="audio_codec_card.png"><img src="media/audio_codec_card.png" class="media" alt="" /></a></p><p>The AD1836 audio card provides three channels of stereo audio output (6 total), two channels of stereo input, S/PDIF in and S/PDIF out. The SPORT interface of the processor is linked with the stereo audio data input and output pins of the AD1836 codec. The processor is capable of transferring data to the audio codec in time-division multiplexed (TDM) mode and can operate at a maximum of 48 kHz sample rate but allows for simultaneous use of all input and output channels. </p><p>The AD1836 audio codec’s internal configuration registers are configured using the processor’s SPI ports. The processor’s programmable flag pin is used as the select for this device. For information on how to configure the multichannel codec, go to the AD1836 Driver in the uClinux kernel.</p></div><!-- SECTION [37-1478] --><h3><a name="ad1836a" id="ad1836a">AD1836A</a></h3><div class="level3"><p>The AD1836A is a high performance, single-chip codec that provides three stereo DACs and two stereo ADCs using ADI鈥檚 patented multibit 危-螖 architecture. An SPI port is included, allowing a microcontroller to adjust volume and many other parameters. The AD1836A operates from a 5 V supply, with provision for a separate output supply to interface with low voltage external circuitry like the Blackfin processor.</p><p>There are four ADC channels in the AD1836A configured as two independent stereo pairs. One stereo pair is the primary ADC and has fully differential inputs. The second pair can be programmed to operate in one of three possible input modes (programmed via SPI ADC Control Register 3). The ADC section may also operate at a sample rate of 96 kHz with only the two primary channels active. The ADCs include an on-board digital decimation filter with 120 dB stop-band attenuation and linear phase response, operating at an over-sampling ratio of 128 (for 4-channel 48 kHz operation) or 64 (for 2-channel 96 kHz operation).</p><p>The AD1836A has six DAC channels arranged as three independent stereo pairs, with six fully differential analog outputs for improved noise and distortion performance. Each channel has its own independently programmable attenuator, adjustable in 1024 linear steps. Digital inputs are supplied through three serial data input pins (one for each stereo pair) and a common frame (DLRCLK) and bit (DBCLK) clock. Alternatively, one of the 鈥減acked data鈥⌨️ 快捷键说明
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