ADAU1701数据手册_adi1701滤波器类型是什么

DSP

ADAU1701

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SigmaDSP 28-/56-Bit Audio Processor

with Two ADCs and Four DACs

ADAU1701

Rev. B

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.

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

Tel: 781.329.4700 www.analog.com

FEATURES

28-/56-bit, 50 MIPS digital audio processor

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

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

Complete standalone operation

Self-boot from serial EEPROM

Auxiliary ADC with 4-input mux for analog control

GPIOs for digital controls and outputs

Fully programmable with SigmaStudio graphical tool

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

double-precision processing

Clock oscillator for generating a master clock from crystal

PLL for generating master clock from 64 × f

, 256 × f

384 × f

, or 512 × f

clocks

Flexible serial data input/output ports with I

S-compatible,

left-justified, right-justified, and TDM modes

Sampling rates of up to 192 kHz are 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)

GENERAL DESCRIPTION

The ADAU1701 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.

This processing can be used to compensate for real-world

limitations of speakers, amplifiers, and listening environments,

providing dramatic 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 perfor-

mance. The ADAU1701 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.

ADAU1701 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

ADAU1701 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 ADAU1701 communicates through an

C® bus or a 4-wire SPI port.

ADAU1701

Rev. B | Page 2 of 52

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description......................................................................... 1

Revision History ............................................................................... 3

Functional Block Diagram .............................................................. 4

Specifications..................................................................................... 5

Analog Performance .................................................................... 5

Digital Input/Output.................................................................... 6

Power.............................................................................................. 6

Temperature Range ...................................................................... 6

PLL and Oscillator........................................................................ 6

Regulator........................................................................................ 7

Digital Timing Specifications ..................................................... 7

Absolute Maximum Ratings.......................................................... 10

Thermal Resistance .................................................................... 10

ESD Caution................................................................................ 10

Pin Configuration and Function Descriptions........................... 11

Typical Performance Characteristics ........................................... 14

System Block Diagram................................................................... 15

Theory of Operation ...................................................................... 16

Initialization .................................................................................... 17

Power-Up Sequence ................................................................... 17

Control Registers Setup ............................................................. 17

Recommended Program/Parameter Loading Procedure ..... 17

Power Reduction Modes............................................................ 17

Using the Oscillator.................................................................... 18

Setting Master Clock/PLL Mode.............................................. 18

Voltage Regulator ....................................................................... 19

Audio ADCs .................................................................................... 20

Audio DACs .................................................................................... 21

Control Ports................................................................................... 22

C Port ........................................................................................ 23

SPI Port ........................................................................................ 26

Self-Boot ...................................................................................... 27

Signal Processing ............................................................................ 29

Numeric Formats........................................................................ 29

Programming .............................................................................. 29

RAMs and Registers....................................................................... 30

Address Maps.............................................................................. 30

Parameter RAM.......................................................................... 30

Data RAM ................................................................................... 30

Read/Write Data Formats ......................................................... 30

Control Register Map..................................................................... 32

Control Register Details ................................................................ 34

2048 to 2055 (0x0800 to 0x0807)—Interface Registers......... 34

2056 (0x0808)—GPIO Pin Setting Register ........................... 35

2057 to 2060 (0x0809 to 0x080C)—Auxiliary ADC Data

Registers....................................................................................... 36



2064 to 2068 (0x0810 to 0x0814)—Safeload Data Registers 37

2069 to 2073 (0x0815 to 0x819)—Safeload Address Registers

....................................................................................................... 37



2074 to 2075 (0x081A to 0x081B)—Data Capture Registers 38

2076 (0x081C)—DSP Core Control Register ......................... 39

2078 (0x081E)—Serial Output Control Register ................... 40

2079 (0x081F)—Serial Input Control Register....................... 41

2080 to 2081 (0x0820 to 0x0821)—Multipurpose Pin

Configuration Registers............................................................. 42



2082 (0x0822)—Auxiliary ADC and Power Control ............ 43

2084 (0x0824)—Auxiliary ADC Enable.................................. 43

2086 (0x0826)—Oscillator Power-Down................................ 43

2087 (0x0827)—DAC Setup...................................................... 44

Multipurpose Pins .......................................................................... 45

Auxiliary ADC............................................................................ 45

General-Purpose Input/Output Pins....................................... 45

Serial Data Input/Output Ports ................................................ 45

Layout Recommendations............................................................. 48

Parts Placement .......................................................................... 48

Grounding ................................................................................... 48

Typical Application Schematics.................................................... 49

Self-Boot Mode........................................................................... 49

C Control .................................................................................. 50

SPI Control.................................................................................. 51

Outline Dimensions ....................................................................... 52

Ordering Guide .......................................................................... 52

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