PCM2903C_14 Datasheet, PDF (20/30 Pages) Texas Instruments – Stereo Audio Codec with USB Interface, Single-Ended Analog Input/Output, and S/PDIF

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/f_S 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.
ALTERNATIVE
SETTING
00
01
02
03
04
16-bit
16-bit
8-bit
8-bit
Table 4. Interface #1 Alternative Settings
Stereo
Mono
Stereo
Mono
DATA
FORMAT
Zero bandwidth
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
Twos complement (PCM)
TRANSFER
MODE
Adaptive
Adaptive
Adaptive
Adaptive
SAMPLING RATE
(kHz)
32, 44.1, 48
32, 44.1, 48
32, 44.1, 48
32, 44.1, 48
20
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