PCM9211
SBAS495 –JUNE 2010
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The PCM9211 has two RECOUT signals that can be routed to the MPO port. The respective sources can be
drawn from one of the 12 S/PDIF inputs, or the DIT module.
Channel status, user data, and valid audio data from the S/PDIF stream can be found in various registers or
routed to MPIO pins. In addition, the block start signal can be routed to an I/O pin, so that any postprocessing
DSP can be informed of the start of a frame for decoding data and so forth.
The DIR module in the PCM9211 complies with these digital audio I/F standards:
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•
•
•
•
S/PDIF
IEC60958 (formerly IEC958)
JEITA CPR-1205 (formerly EIAJ CP-1201/340)
AES3
EBU Tech 3250 (also known as AES/EBU)
In addition, the DIR Module within the PCM9211 also meets and exceeds jitter tolerance specifications defined
by IEC60958-3 for sampling frequencies between 28 kHz and 216 kHz.
Digital Audio Interface Transmitter (DIT)
The DIT (S/PDIF transmitter) is a relatively simple module. The DIT integrated in the PCM9211 is able to
transmit control status and user bits in the data stream, as well as standard 24-bit audio. Channel status, user
data, and Audio Valid bits in the stream are configured on incoming MPIO pins.
The DIT complies with the following audio standards:
•
•
•
•
•
S/PDIF
IEC60958 (formerly IEC958)
JEITA CPR-1205 (formerly EIAJ CP-1201/340)
AES3
EBU Tech 3250 (also known as AES/EBU)
Analog-to-Digital Converter (ADC)
The integrated ADC within the PCM9211 is capable of supporting 24-bit data from 16 kHz up to 96 kHz. The
signal-to-noise ratio (SNR) of the ADC module at 96 kHz is 101 dB.
The PCM9211 contains integrated front-end buffer amplifiers for the ADC, thereby reducing the need for external
amplifiers. The ADC also has several digital features, including digital volume control (adjustable from –100 dB to
+20 dB in 0.5-dB steps), digital mute, and the ability to phase-invert the digital output.
Additionally, interrupts can be generated based on the ADC inputs being larger than user-defined threshold
levels.
In standalone mode, the ADC can be either a clock master or a clock slave.
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