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PCM2903C Datasheet(PDF) 21 Page - Texas Instruments

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Part # PCM2903C
Description  Stereo Audio Codec with USB Interface, Single-Ended Analog Input/Output, and S/PDIF
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

PCM2903C Datasheet(HTML) 21 Page - Texas Instruments

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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.
Copyright © 2012, Texas Instruments Incorporated
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