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4-Channel, Software-Selectable, True

Bipolar Input, 12-Bit Plus Sign ADC

AD7324

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.

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

Tel: 781.329.4700 www.analog.com

FEATURES FUNCTIONAL BLOCK DIAGRAM

12-bit plus sign SAR ADC

DOUT

SCLK

DIN

DRIVE

REFIN

OUT

AGND V

DGND

CONTROL LOGIC

AND REGISTERS

13-BIT

SUCCESSIVE

APPROXIMATION

ADC

T/H

2.5V

VREF

I/P

MUX

CHANNEL

SEQUENCER

AD7324

4864-001

True bipolar input ranges

Software-selectable input ranges

±10 V, ±5 V, ±2.5 V, 0 V to +10 V

1 MSPS throughput rate

Four analog input channels with channel sequencer

Single-ended, true differential, and pseudo differential

analog input capability

High analog input impedance

Low power: 21 mW

Full power signal bandwidth: 22 MHz

Internal 2.5 V reference

High speed serial interface

Power-down modes

16-lead TSSOP package

iCMOS

™

process technology

Figure 1.

GENERAL DESCRIPTION PRODUCT HIGHLIGHTS

1. The AD7324 can accept true bipolar analog input signals,

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

The AD7324

is a 4-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.

2. The four analog inputs can be configured as four single-

ended inputs, two true differential input pairs, two pseudo

differential inputs, or three pseudo differential inputs.

3. 1 MSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-

compatible interface.

4. Low power, 30 mW maximum, at 1 MSPS throughput rate.

5. Channel sequencer.

The AD7324 can accept true bipolar analog input signals. The

AD7324 has four software-selectable input ranges, ±10 V, ±5 V,

±2.5 V, and 0 V to +10 V. Each analog input channel can be

independently programmed to one of the four input ranges.

The analog input channels on the AD7324 can be programmed

to be single-ended, true differential, or pseudo differential.

Table 1. Similar Products Selection Table

Device

Number

Throughput

Rate

Number of

Channels

Number of bits

AD7329 250 kSPS 12-bit plus sign 8

The ADC contains a 2.5 V internal reference. The AD7324 also

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

applied to the REFIN/OUT pin, the AD7324 can accept a true

bipolar ±12 V analog input. Minimum ±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 1 MSPS.

AD7328 1000 kSPS 12-bit plus sign 8

AD7327 500 kSPS 12-bit plus sign 8

AD7323 500 kSPS 12-bit plus sign 4

AD7322 1000 kSPS 12-bit plus sign 2

AD7321 500 kSPS 12-bit plus sign 2

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

AD7324

Rev. 0 | Page 2 of 36

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 Configurations 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

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

Sequence Register....................................................................... 25

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

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

Reference ..................................................................................... 28

DRIVE

............................................................................................ 28

Modes of Operation ....................................................................... 29

Normal Mode.............................................................................. 29

Full Shutdown Mode.................................................................. 29

Autoshutdown Mode ................................................................. 30

Autostandby Mode..................................................................... 30

Power vs. Throughput Rate....................................................... 31

Serial Interface ................................................................................ 32

Microprocessor Interfacing........................................................... 33

AD7324 to ADSP-218x.............................................................. 33

AD7324 to ADSP-BF53x........................................................... 33

Application Hints ........................................................................... 34

Layout and Grounding .............................................................. 34

Outline Dimensions ....................................................................... 35

Ordering Guide .......................................................................... 35

REVISION HISTORY

12/05—Revision 0: Initial Version

AD7324

Rev. 0 | Page 5 of 36

B Version

Parameter

Min Typ Max Unit Test Conditions/Comments

ANALOG INPUT

Input Voltage Ranges Reference = 2.5 V; see Table 6

(Programmed via Range

±10 V V

= 10 V min, V

= −10 V min, V

= 2.7 V to 5.25 V

±5 V V

= 5 V min, V

= −5 V min, V

= 2.7 V to 5.25 V

±2.5 V V

= 5 V min, V

= − 5 V min, V

= 2.7 V to 5.25 V

0 to 10 V V

= 10 V min, V

= AGND min, V

= 2.7 V to 5.25 V

Pseudo Differential V

(−)

Input Range

= 16.5 V, V

= −16.5 V, V

= 5 V; see Figure 40 and

Figure 41

±3.5 V Reference = 2.5 V; range = ±10 V

±6 V Reference = 2.5 V; range = ±5 V

±5 V Reference = 2.5 V; range = ±2.5 V

+3/−5 V Reference = 2.5 V; range = 0 V to +10 V

DC Leakage Current ±80 nA V

= V

or V

3 nA Per channel, V

= V

or V

Input Capacitance

13.5 pF When in track, ±10 V range

16.5 pF When in track, ±5 V and 0 V to +10 V ranges

21.5 pF When in track, ±2.5 V range

3 pF When in hold, all ranges

REFERENCE INPUT/OUTPUT

Input Voltage Range 2.5 3 V

Input DC Leakage Current ±1 μA

Input Capacitance 10 pF

Reference Output Voltage 2.5 V

Reference Output Voltage Error

@ 25°C

±5 mV

Reference Output Voltage

MIN

to T

MAX

±10 mV

Reference Temperature

Coefficient

25 ppm/°C

3 ppm/°C

Reference Output Impedance 7 Ω

LOGIC INPUTS

Input High Voltage, V

INH

2.4 V

Input Low Voltage, V

INL

0.8 V V

= 4.75 V to 5.25 V

0.4 V V

= 2.7 to 3.6 V

Input Current, I

±1 μA V

= 0 V or V

DRIVE

Input Capacitance, C

10 pF

LOGIC OUTPUTS

Output High Voltage, V

DRIVE

−

0.2 V

V I

SOURCE

= 200 μA

Output Low Voltage, V

0.4 V I

SINK

= 200 μA

Floating-State Leakage Current ±1 μA

Floating-State Output

Capacitance

5 pF

Output Coding Straight natural binary Coding bit set to 1 in control register

Twos complement Coding bit set to 0 in control register

CONVERSION RATE

Conversion Time 800 ns 16 SCLK cycles with SCLK = 20 MHz

Track-and-Hold Acquisition

Time

2, 3

305 ns Full-scale step input; see the Terminology section

Throughput Rate 1 MSPS See the Serial Interface section; V

= 4.75 V to 5.25 V

770 kSPS V

< 4.75 V

剩余35页未读，继续阅读

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wen195926453

2015-09-22

没有中文的，英文的也还可以
minding

2014-09-22

要是有中文资料就更好了
tonychoppe

2014-02-09

原版的数据手册，对于使用调试这个芯片比较有帮助。
lhx522729

2013-11-14

不错，调试成功了

hualiming

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