Reference Design Information; Ad2437 - Audio Bus A B Transceiver; Adau1701 Sigmadsp 28-/56-Bit Audio Processor With Two Adcs And Four Dacs - Analog Devices EVAL-AD2437B1NZ Evaluation Board Manual

Reference Design Information

A reference design info package is available for download on the Analog Devices Web site. The package provides
information on the schematic design, layout, fabrication, and assembly of the board.
The information can be found at:
https://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/EVAL-
AD2437B1NZ.html
AD2437 - Audio Bus A
The AD2437 provides a multi-channel, I2S/TDM link over distances of up to 30 m between nodes. It embeds bi-
directional synchronous pulse-code modulation (PCM) data (for example, digital audio), clock, and synchronization
signals onto a single differential wire pair. A
sy-chained nodes at different locations to contribute and/or consume time division multiplexed channel content.
2
A B is a single-main, multiple-sub system where the transceiver at the host controller is the main node and generates
clock, synchronization, and framing for all sub nodes. The main A
2
(I C and SPI) for configuration and read back. An extension of this control bus is embedded in the A
stream, which grants direct access of registers and status information on sub transceivers as well as I
munication over distance.
The transceiver can connect directly to general-purpose digital signal processors (DSPs), field-programmable gate
arrays (FPGAs), application specific integrated circuits (ASICs), microphones, analog-to-digital converters (ADCs),
digital-to-analog converters (DACs), and codecs through a multi-channel I
pulse density modulation (PDM) interface for direct connection of up to four PDM digital microphones.
Finally, the transceiver also supports an A
to the sub nodes over the same daisy-chained, twisted pair cable as used for the communication link. Please refer to
the datasheet for more details.
ADAU1701 SigmaDSP 28-/56-Bit Audio Processor with Two
ADCs and Four DACs
The ADAU1701 is a complete single-chip audio system with a 28-/56-bit audio DSP, ADCs, DACs, and microcon-
troller-like control interfaces. Signal processing includes equalization, crossover, bass enhancement, multiband dy-
namics processing, delay compensation, speaker compensation, and stereo image widening. This processing can be
used to compensate for real-world limitations of speakers, amplifiers, and listening environments, providing dramat-
ic improvements in perceived audio quality.
Its signal processing is comparable to that found in high end studio equipment. Most processing is done in full 56-
bit, double precision mode, resulting in very good low level signal performance. The ADAU1701 is a fully
EVAL-AD2437B1NZ Manual
2
B Transceiver
2
B supports a direct point to point connection and allows multiple, dai-
2
B bus powering feature, where the main node supplies voltage and current
2
B device is programmable over a control bus
2
S/TDM interface. It also provides a
Reference Design Information
2
B data
2
C and SPI com-
2–3