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PCM2903B Datasheet(PDF) 22 Page - Texas Instruments

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Part # PCM2903B
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

PCM2903B Datasheet(HTML) 22 Page - Texas Instruments

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Clock and Reset
Digital Audio Interface
Supported Input/Output Data
Channel Status Information
Copyright Management
PCM2903B
SLES228 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
The PCM2903B requires a 12-MHz (±500 ppm) clock for the USB and audio function, which can be generated by
a built-in crystal oscillator with a 12-MHz crystal resonator or supplied by an external clock. The 12-MHz crystal
resonator must be connected to XTI (pin 21) and XTO (pin 20) with one high (1-M
Ω) resistor and two small
capacitors, the capacitance of which depends on the load capacitance of the crystal resonator. If the external
clock is used, the clock must be supplied to XTI, and XTO must be open.
The PCM2903B has an internal power-on reset circuit, which triggers automatically when VDD (pin 27) exceeds
2.5 V typical (2.7 V to 2.2 V). Approximately 700
µs is required until internal reset release.
The PCM2903B employs both S/PDIF input and output. Isochronous-out data from the host are encoded to the
S/PDIF output and the DAC analog output. Input data are selected as either S/PDIF or ADC analog input. When
the device detects an S/PDIF input and successfully locks on the received data, the isochronous-in transfer data
source is automatically selected from S/PDIF itself; otherwise, the data source selected is the ADC analog input.
This feature is a customer option. It is the responsibility of the user to implement this feature.
The following data formats are accepted by the S/PDIF input and output. All other data formats are unable to use
S/PDIF.
• 48-kHz 16-bit stereo
• 44.1-kHz 16-bit stereo
• 32-kHz 16-bit stereo
Any mismatch of the sampling rate between the input S/PDIF signal and the host command is not acceptable.
Any mismatch of the data format between the input S/PDIF signal and the host command may cause unexpected
results, with the following exceptions:
• Recording in monaural format from stereo data input at the same data rate
• Recording in 8-bit format from 16-bit data input at the same data rate
A combination of these two conditions is not acceptable.
For playback, all possible data-rate sources are converted to 16-bit stereo format at the same source data rate.
The channel status information is fixed as consumer application, PCM mode, copyright, and digital/digital
converter. All other bits are fixed as 0's except for the sample frequency, which is set automatically according to
the data received through the USB.
Isochronous-in data are affected by the serial copy management system (SCMS). When the control bit indicates
that the received digital audio data are original, the input digital audio data are transferred to the host. If the data
are indicated as first generation or higher, the transferred data are routed to the analog input.
Digital audio data output is always encoded as original with SCMS control.
22
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): PCM2903B


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