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PCM2903C Datasheet(PDF) 20 Page - Texas Instruments |
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PCM2903C Datasheet(HTML) 20 Page - Texas Instruments |
20 / 31 page ![]() PCM2903C SBFS038 – JUNE 2012 www.ti.com Interface #0 Interface #0 is the control interface. Alternative setting #0 is the only possible setting for interface #0. Alternative setting #0 describes the standard audio control interface. The audio control interface consists of a single terminal. The PCM2903C has the following five terminals: • Input terminal (IT #1) for isochronous-out stream • Output terminal (OT #2) for audio analog output • Feature unit (FU #3) for DAC digital attenuator • Input terminal (IT #4) for audio analog input • Output terminal (OT #5) for isochronous-in stream Input terminal #1 is defined as USB stream (terminal type 0x0101). Input terminal #1 can accept two-channel audio streams consisting of left and right channels. Output terminal #2 is defined as a speaker (terminal type 0x0301). Input terminal #4 is defined as a line connector (terminal type 0x0603). Output terminal #5 is defined as a USB stream (terminal type 0x0101). Output terminal #5 can generate two-channel audio streams composed of left and right channel data. Feature unit #3 supports the following sound control features: • Volume control • Mute control The built-in digital volume controller can be manipulated by an audio class specific request from 0 dB to –64 dB in 1-dB steps. Changes are made by incrementing or decrementing by one step (1 dB) for every 1/fS time interval until the volume level has reached the requested value. Each channel can be set for different values. The master volume control is not supported. A request to the master volume is stalled and ignored. The built-in digital mute controller can be manipulated by audio class-specific request. A master mute control request is acceptable. A request to an individual channel is stalled and ignored. Interface #1 Interface #1 is the audio streaming data-out interface. Interface #1 has the five alternative settings described in Table 4. Alternative setting #0 is the zero-bandwidth setting. Table 4. Interface #1 Alternative Settings ALTERNATIVE DATA TRANSFER SAMPLING RATE SETTING FORMAT MODE (kHz) 00 Zero bandwidth 01 16-bit Stereo Twos complement (PCM) Adaptive 32, 44.1, 48 02 16-bit Mono Twos complement (PCM) Adaptive 32, 44.1, 48 03 8-bit Stereo Twos complement (PCM) Adaptive 32, 44.1, 48 04 8-bit Mono Twos complement (PCM) Adaptive 32, 44.1, 48 20 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Link(s): PCM2903C |
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