Datasheet
PCM2903C
www.ti.com
SBFS038 –JUNE 2012
Interface #2
Interface #2 is the audio streaming data-in interface. Interface #2 has the 19 alternative settings described in
Table 5. Alternative setting #0 is the zero-bandwidth setting. All other alternative settings are operational settings.
Table 5. Interface #2 Alternative Settings
ALTERNATIVE DATA TRANSFER SAMPLING RATE
SETTING FORMAT MODE (kHz)
00 Zero bandwidth
01 16-bit Stereo Twos complement (PCM) Asynchronous 48
02 16-bit Mono Twos complement (PCM) Asynchronous 48
03 16-bit Stereo Twos complement (PCM) Asynchronous 44.1
04 16-bit Mono Twos complement (PCM) Asynchronous 44.1
05 16-bit Stereo Twos complement (PCM) Asynchronous 32
06 16-bit Mono Twos complement (PCM) Asynchronous 32
07 16-bit Stereo Twos complement (PCM) Asynchronous 22.05
08 16-bit Mono Twos complement (PCM) Asynchronous 22.05
09 16-bit Stereo Twos complement (PCM) Asynchronous 16
0A 16-bit Mono Twos complement (PCM) Asynchronous 16
0B 8-bit Stereo Twos complement (PCM) Asynchronous 16
0C 8-bit Mono Twos complement (PCM) Asynchronous 16
0D 8-bit Stereo Twos complement (PCM) Asynchronous 8
0E 8-bit Mono Twos complement (PCM) Asynchronous 8
0F 16-bit Stereo Twos complement (PCM) Synchronous 11.025
10 16-bit Mono Twos complement (PCM) Synchronous 11.025
11 8-bit Stereo Twos complement (PCM) Synchronous 11.025
12 8-bit Mono Twos complement (PCM) Synchronous 11.025
Interface #3
Interface #3 is the interrupt data-in interface. Alternative setting #0 is the only possible setting for interface #3.
Interface #3 consists of the HID consumer control device and reports the status of these three key parameters:
• Mute (0xE209)
• Volume up (0xE909)
• Volume down (0xEA09)
End-Points
The PCM2903C has the following four end-points:
• Control end-point (EP #0)
• Isochronous-out audio data stream end-point (EP #2)
• Isochronous-in audio data stream end-point (EP #4)
• HID end-point (EP #5)
The control end-point is a default end-point. The control end-point is used to control all functions of the
PCM2903C by the standard USB request and an USB audio class specific request from the host. The
isochronous-out audio data stream end-point is an audio sink end-point, which receives the PCM audio data. The
isochronous-out audio data stream end-point accepts the adaptive transfer mode. The isochronous-in audio data
stream end-point is an audio source end-point that transmits the PCM audio data. The isochronous-in audio data
stream end-point uses asynchronous transfer mode. The HID end-point is an interrupt-in end-point. HID end-
point reports HID0, HID1, and HID2 pin status every 32 ms.
The human interface device (HID) pins are defined as consumer control devices. The HID function is designed
as an independent end-point from both isochronous-in and -out end-points. Therefore, the result obtained from
the HID operation depends on the host software. Typically, the HID function is used as the primary audio-out
device.
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