EVAL-ADAU1702EB AD [Analog Devices], EVAL-ADAU1702EB Datasheet

EVAL-ADAU1702EB

Manufacturer Part Number

EVAL-ADAU1702EB

Description

SigmaDSP 28-56-Bit Audio Processor with Two ADCs and Four DACs

Manufacturer

AD [Analog Devices]

Datasheet

1.EVAL-ADAU1702EB.pdf (52 pages)

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FEATURES

28-/56-bit, 25 MIPS digital audio processor

Two ADCs: SNR of 100 dB, THD + N of −83 dB

Four DACs: SNR of 104 dB, THD + N of −90 dB

Complete standalone operation

Fully programmable with SigmaStudio™ graphical tool

28-bit × 28-bit multiplier with 56-bit accumulator for full

Clock oscillator for generating master clock from crystal

PLL for generating master clock from 64 × f

Flexible serial data input/output ports with I

Sampling rates up to 192 kHz supported

On-chip voltage regulator for compatibility with 3.3 V systems

48-lead, plastic LQFP

APPLICATIONS

Multimedia speaker systems

MP3 player speaker docks

Automotive head units

Minicomponent stereos

Digital televisions

Studio monitors

Speaker crossovers

Musical instrument effects processors

In-seat sound systems (aircraft/motor coaches)

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registered trademarks are the property of their respective owners.

double-precision processing

384 × f

left-justified, right-justified, and TDM modes

Self-boot from serial EEPROM

Auxiliary ADC with 4-input mux for analog control

GPIOs for digital controls and outputs

, or 512 × f

clocks

2-CHANNEL

ADC_RES

ANALOG

FILTA/

INPUT

RESET

, 256 × f

SELECT

RESET/

REGULATOR

MODE

S-compatible,

3.3V

STEREO

ADC

FUNCTIONAL BLOCK DIAGRAM

DIGITAL

1.8V

BOOT

SELF

VDD

INTERFACE

SELFBOOT

SigmaDSP

CONTROL

WRITEBACK

GROUND

AND

DIGITAL

AND

C/SPI

ADAU1702

ANALOG

AUDIO PROCESSOR CORE

DIGITAL

10ms DELAY MEMORY

VDD

INPUT

8-CH

28-/56-BIT, 25MIPS

DIGITAL IN

Figure 1.

ANALOG

GROUND

GPIO

INPUT/OUTPUT MATRIX

8-BIT

AUX

ADC

AUX ADC

MODE

PLL

GPIO

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

GENERAL DESCRIPTION

The ADAU1702 is a complete single-chip audio system with a

28-/56-bit audio DSP, ADCs, DACs, and microcontroller-like

control interfaces. Signal processing includes equalization, cross-

over, bass enhancement, multiband dynamics processing, delay

compensation, speaker compensation, and stereo image widening

and can be used to compensate for real-world limitations of

speakers, amplifiers, and listening environments, providing a

dramatic improvements of 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 ADAU1702 is a fully programmable DSP. The

easy to use SigmaStudio software allows the user to graphically

configure a custom signal processing flow using blocks such as

biquad filters, dynamics processors, level controls, and GPIO

interface controls.

ADAU1702 programs can be loaded on power-up either from a

serial EEPROM through its own self-boot mechanism or from

an external microcontroller. On power-down, the current state

of the parameters can be written back to the EEPROM from the

ADAU1702 to be recalled the next time the program is run.

Two Σ-Δ ADCs and four Σ-Δ DACs provide a 98.5 dB analog

input to analog output dynamic. Each ADC has a THD + N of

−83 dB, and each DAC has a THD + N of −90 dB. Digital input

and output ports allow a glueless connection to additional

ADCs and DACs. The ADAU1702 communicates through an

PLL

with Two ADCs and Four DACs

C® bus or a 4-wire SPI® port.

FILTER

LOOP

PLL

GPIO

DIGITAL OUT

28-/56-Bit Audio Processor

GPIO

OSCILLATOR

CRYSTAL

CLOCK

DIGITAL

OUTPUT

DAC

8-CH

FILTD/CM

4-CHANNEL

ANALOG

OUTPUT

ADAU1702

www.analog.com

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