EVAL-ADAU1701EB AD [Analog Devices], EVAL-ADAU1701EB Datasheet - Page 13

• Manufacturer Part Number: EVAL-ADAU1701EB
• Description: SigmaDSP 28/56-Bit Audio Processor with 2ADC/4DAC
• Manufacturer: AD [Analog Devices]

Preliminary Technical Data
OVERVIEW
The core of the ADAU1701 is a 28-bit DSP (56-bit with double
precision) optimized for audio processing. The program and
parameter RAMs can be loaded with a custom audio processing
signal flow built with ADI’s SigmaStudio graphical
programming software. The values stored in the parameter
RAM control individual signal processing blocks, such as IIR
equalization filters, dynamics processors, audio delays, and
mixer levels. A safeload feature allows parameters to be
transparently updated without causing clicks on the output
signals.
The program RAM, parameter RAM, and register contents can
be saved in an external EEPROM, from which the ADAU1701
can self-boot on start-up. In this stand-alone mode, parameters
can be controlled through the on-board multipurpose pins. The
ADAU1701 can accept controls from switches, potentiometers,
rotary encoders, and IR receivers. Parameters such as volume
and tone settings can be saved to the EEPROM on power-down
and recalled when it is powered up again.
The ADAU1701 can operate with either digital I/Os, analog
I/Os, or a mix of both. The stereo ADC and four-channel DAC
each have an SNR of at least 100 dB and THD+N of at least -
80 dB. The flexible serial data input/output ports allow for
glueless interconnection to a variety of ADCs, DACs, general-
purpose DSPs, S/PDIF receivers & transmitters, and sample rate
converters. The ADAU1701 can be configured in I
justified, right-justified, or TDM serial port compatible modes.
Twelve multi-purpose (MP) pins allow for the ADAU1701 to
input external control signals and output flags or controls to
other devices in the system. These MP pins can be configured
as digital I/Os, inputs to the 4-channel auxiliary ADC, or set up
as the serial data I/O ports. As inputs, they can be connected to
buttons, switches, rotary encoders, potentiometers, IR receivers,
or other external control circuitry to control the internal signal
processing program. When configured as outputs, these pins
can be used to drive LEDs (with a buffer), control other ICs, or
connect to other external circuitry in an application.
The ADAU1701 has a sophisticated control port that supports
complete read/write capability of all memory locations. Control
registers are provided to offer complete control of the chip’s
configuration and serial modes. Handshaking is included for
ease of memory uploads and downloads. The ADAU1701 can
be configured for either SPI or I
An on-board oscillator can be connected to an external crystal
to generate the master clock. Also, a master clock phase-locked
loop (PLL) allows the ADAU1701 to be clocked from a variety
of different clock speeds. The PLL can accept inputs of 64 × f
2
C control.
2
S, left-
Rev. PrF | Page 13 of 43
S
,
256 × f
master clock.
The SigmaStudio software is used to program and control the
SigmaDSP through the control port. Along with designing and
tuning a signal flow, the tools can configure the all registers and
burn a new program into the external EEPROM. SigmaStudio’s
graphical interface allows anyone with digital or analog audio
processing knowledge to easily design a DSP signal flow and
port it to a target application. It also provides enough flexibility
and programmability for an experienced DSP programmer to
have in-depth control of the design. In SigmaStudio, the user
can simply connect graphical blocks such as biquad filters,
dynamics processors, mixers, and delays, compile the design,
and load the program and parameter files into the ADAU1701’s
memory through the control port. Signal processing blocks
available in the provided libraries include
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More processing blocks are always in development. Analog
Devices also provides proprietary and third-party algorithms
for applications such as matrix decoding, bass enhancement,
and surround virtualizers. Please contact ADI for information
about licensing these algorithms.
The ADAU1701 operates from a 1.8 V digital power supply and
a 3.3 V analog supply. An on-board voltage regulator can be
used to operate the chip from a single 3.3 V supply. It is
fabricated on a single monolithic integrated circuit and is
housed in a 48-lead LQFP package for operation over the –0°C
to +70°C temperature range.
Single- and double-precision biquad filters
Mono and multichannel dynamics processors with peak or
RMS detection
Mixers and splitters
Tone and noise generators
Fixed and variable gain
Loudness
Delay
Stereo enhancement
Dynamic bass boost
Noise and tone sources
Level detectors
GPIO control & conditioning
S
, 384 × f
S
, or 512 × f
S
to generate the core’s internal
ADAU1701