adau1442 Analog Devices, Inc., adau1442 Datasheet - Page 3

• Manufacturer Part Number: adau1442
• Description: Sigmadsp Digital Audio Processor With Flexible Audio Routing Matrix
• Manufacturer: Analog Devices, Inc.

The ADAU1442, ADAU1445, and ADAU1446, referred to
collectively as the ADAU144x, are enhanced audio processors that
allow full flexibility in routing all input and output signals. The
SigmaDSP® core features full 28-bit processing (56-bit in double
precision mode), synchronous parameter loading for ensuring
filter stability, and 100% code efficiency with the SigmaStudio™
tools. This DSP allows system designers to compensate for the
real-world limitations of speakers, amplifiers, and listening
environments, resulting in a dramatic improvement of the
perceived audio quality through speaker equalization, multiband
compression, limiting, and third-party branded algorithms.
The flexible audio routing matrix (FARM) allows the user to
multiplex inputs from multiple sources running at various
sample rates to or from the SigmaDSP core. This drastically
reduces the complexity of signal routing and clocking issues in
the audio system. FARM includes up to eight stereo asynchronous
sample rate converters (depending on the device model), Sony/
Philips Digital Interconnect Format (S/PDIF) input and output,
and serial (I
these inputs can be routed to the SigmaDSP core or to any of the
asynchronous sample rate converters (ASRCs). Similarly, any one
of the output signals can be taken from the SigmaDSP core or
2
S) and time division multiplexing (TDM) I/Os. Any of
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from any of the ASRC outputs. This routing scheme, which can
be modified at any time via control registers, allows for
maximum system flexibility.
The ADAU1442, ADAU1445, and ADAU1446 differ only in ASRC
functionality and packaging. The ADAU1442 and ADAU1445 con­
tain 16 channels of ASRCs and are packaged in a TQFP, whereas
the ADAU1446 contains no ASRCs and is packaged in an LQFP.
The ADAU144x can be controlled in one of two operational
modes. First, the settings of the chip can be loaded and dynamically
updated through the SPI/I
from an external EEPROM in a system with no microcontroller.
There is also a bank of multipurpose (MP) pins that can be used
as general-purpose digital I/Os or as inputs to the 4-channel
auxiliary control ADC.
The ADAU144x is supported by the SigmaStudio graphical
development environment. This software includes audio processing
blocks such as FIR and IIR filters, dynamics processors, mixers,
low level DSP functions, and third-party algorithms for fast
development of custom signal flows.
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C port. Second, the DSP can self-boot