AD7321_15 datasheet, PDF - EEWORLD Datasheet

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AD7321_15: Description500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC; File Size893KB，37 Pages; ManufacturerADI; Websitehttps://www.analog.com

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AD7321_15 Overview

500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC

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Data Sheet

FEATURES

500 kSPS, 2-Channel, Software-Selectable,

True Bipolar Input, 12-Bit Plus Sign ADC

AD7321

FUNCTIONAL BLOCK DIAGRAM

REFIN/OUT

12-bit plus sign SAR ADC

True bipolar input ranges

Software-selectable input ranges

±10 V, ±5 V, ±2.5 V, 0 V to +10 V

500 kSPS throughput rate

2 analog input channels with channel sequencer

Single-ended, true differential, and pseudo differential

analog input capability

High analog input impedance

Low power: 18 mW

Full power signal bandwidth: 22 MHz

Internal 2.5 V reference

High speed serial interface

Power-down modes

14-lead TSSOP package

iCMOS™

process technology

AD7321

2.5V

VREF

I/P

MUX

T/H

13-BIT

SUCCESSIVE

APPROXIMATION

ADC

DOUT

CHANNEL

SEQUENCER

CONTROL LOGIC

AND REGISTERS

SCLK

DIN

DRIVE

AGND

DGND

05399-001

Figure 1.

GENERAL DESCRIPTION

The

AD7321

is a 2-channel, 12-bit plus sign successive

approximation ADC designed on the

iCMOS

(industrial

CMOS) process.

iCMOS

is a process combining high voltage

silicon with submicron CMOS and complementary bipolar

technologies. It enables the development of a wide range of high

performance analog ICs capable of 33 V operation in a footprint

that no previous generation of high voltage parts could achieve.

Unlike analog ICs using conventional CMOS processes,

iCMOS

components can accept bipolar input signals while providing

increased performance, dramatically reduced power consumption,

and reduced package size.

The

AD7321

can accept true bipolar analog input signals. The

AD7321

has four software-selectable input ranges, ±10 V, ±5 V,

±2.5 V, and 0 V to +10 V. Each analog input channel is indepen-

dently programmed to one of the four input ranges. The analog

input channels on the

AD7321

are programmed to be single-ended,

true differential, or pseudo differential.

The ADC contains a 2.5 V internal reference. The

AD7321

also

allows for external reference operation. If a 3 V reference is applied

to the REFIN/OUT pin, the

AD7321

can accept a true bipolar

±12 V analog input. A minimum of ±12 V V

and V

supplies

are required for the ±12 V input range. The ADC has a high speed

serial interface that can operate at throughput rates up to 500 kSPS.

PRODUCT HIGHLIGHTS

The

AD7321

can accept true bipolar analog input signals,

±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals.

The two analog inputs are configured as two single-ended

inputs, one true differential input pair, or one pseudo

differential input.

A 500 kSPS serial interface. SPI®-/QSPI™-/DSP-/

MICROWIRE™-compatible interface.

Low power, 18 mW, at a maximum throughput rate of

500 kSPS.

Channel sequencer.

Throughput

Rate

1000 kSPS

500 kSPS

1000 kSPS

500 kSPS

1000 kSPS

Number of

Channels

Table 1. Similar Devices

Device

Number

AD7329

AD7328

AD7327

AD7324

AD7323

AD7322

Number of bits

12-bit plus sign

Protected by U.S. Patent No. 6,731,232.

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.

Document Feedback

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

Technical Support

www.analog.com

AD7321

TABLE OF CONTENTS

Features .............................................................................................. 1

Functional Block Diagram .............................................................. 1

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

Product Highlights ........................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Timing Specifications .................................................................. 7

Absolute Maximum Ratings............................................................ 8

ESD Caution .................................................................................. 8

Pin Configuration and Function Descriptions ............................. 9

Typical Performance Characteristics ........................................... 10

Terminology .................................................................................... 14

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

Circuit Information .................................................................... 16

Converter Operation .................................................................. 16

Analog Input Structure .............................................................. 17

Typical Connection Diagram ................................................... 19

Analog Input ............................................................................... 19

Driver Amplifier Choice ............................................................ 21

Registers ........................................................................................... 22

Addressing Registers .................................................................. 22

Data Sheet

Control Register ......................................................................... 23

Range Register ............................................................................ 25

Sequencer Operation ..................................................................... 26

Reference ..................................................................................... 27

DRIVE

............................................................................................ 27

Modes of Operation ....................................................................... 28

Normal Mode.............................................................................. 28

Full Shutdown Mode.................................................................. 28

Autoshutdown Mode ................................................................. 29

Autostandby Mode ..................................................................... 29

Power vs. Throughput Rate ....................................................... 30

Serial Interface ................................................................................ 31

Microprocessor Interfacing ........................................................... 32

AD7321 to ADSP-21xx .............................................................. 32

AD7321 to ADSP-BF53x ........................................................... 32

Application Hints ........................................................................... 33

Layout and Grounding .............................................................. 33

Power Supply Configuration .................................................... 33

Outline Dimensions ....................................................................... 34

Ordering Guide .......................................................................... 34

REVISION HISTORY

12/13—Rev. A to Rev. B

Changes to Circuit Information Section and Table 6 ................ 16

Changes to Addressing Registers Section.................................... 22

Changes to Power Supply Configuration Section ...................... 33

10/09—Rev. 0 to Rev. A

Changes to Table 2 ............................................................................ 4

Changes to Figure 53 ...................................................................... 33

Changes to Power Supply Configuration Section ...................... 33

Changes to Table 16 ........................................................................ 33

Changes to Outline Dimensions................................................... 34

Changes to Ordering Guide .......................................................... 34

1/06—Revision 0: Initial Version

Rev. B | Page 2 of 36

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