Sign ADC. AD7323 Datasheet

AD7323 ADC. Datasheet pdf. Equivalent


Analog Devices AD7323
Data Sheet
500 kSPS, 4-Channel, Software-Selectable,
True Bipolar Input, 12-Bit Plus Sign ADC
AD7323
FEATURES
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
Four 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
16-lead TSSOP package
iCMOS process technology
FUNCTIONAL BLOCK DIAGRAM
VDD
REFIN/OUT VCC
AD7323
VIN0
VIN1
VIN2
VIN3
I/P
MUX
2.5V
VREF
T/H
13-BIT
SUCCESSIVE
APPROXIMATION
ADC
CHANNEL
SEQUENCER
AGND
CONTROL LOGIC
AND REGISTERS
VSS DGND
Figure 1.
DOUT
SCLK
CS
DIN
VDRIVE
GENERAL DESCRIPTION
The AD73231 is a 4-channel, 12-bit plus sign successive
approximation analog-to-digital converter (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 conven-
tional CMOS processes, iCMOS components can accept bipolar
input signals while providing increased performance, dramati-
cally reduced power consumption, and reduced package size.
The AD7323 can accept true bipolar analog input signals. The
AD7323 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 AD7323 can be programmed
to be single-ended, true differential, or pseudo differential.
The ADC contains a 2.5 V internal reference. The AD7323 also
allows for external reference operation. If a 3 V reference is
applied to the REFIN/OUT pin, the AD7323 can accept a true
bipolar ±12 V analog input. Minimum ±12 V VDD and VSS
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.
1 Protected by U.S. Patent No. 6,731,232.
Rev. B
Document Feedback
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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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
PRODUCT HIGHLIGHTS
1. The AD7323 can accept true bipolar analog input signals,
±10 V, ±5 V, and ±2.5 V, and 0 V to +10 V unipolar signals.
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. 500 kSPS serial interface. SPI-/QSPI™-/DSP-/MICROWIRE™-
compatible interface.
4. Low power, 18 mW, at a maximum throughput rate of
500 kSPS.
5. Channel sequencer.
Table 1. Similar Devices
Device Throughput
Number Rate
AD7329 1000 kSPS
AD7328 1000 kSPS
AD7327 500 kSPS
AD7324 1000 kSPS
AD7322 1000 kSPS
AD7321 500 kSPS
Number of bits
12-bit plus sign
12-bit plus sign
12-bit plus sign
12-bit plus sign
12-bit plus sign
12-bit plus sign
Number of
Channels
8
8
8
4
2
2
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Technical Support
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AD7323 Datasheet
Recommendation AD7323 Datasheet
Part AD7323
Description 12-Bit Plus Sign ADC
Feature AD7323; Data Sheet 500 kSPS, 4-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC AD732.
Manufacture Analog Devices
Datasheet
Download AD7323 Datasheet




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AD7323* Product Page Quick Links
Last Content Update: 11/01/2016
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Evaluation Kits
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Documentation
Data Sheet
• AD7323: 500 kSPS, 4-Channel, Software-Selectable, True
Bipolar Input, 12-Bit Plus Sign ADC Data Sheet
Software and Systems Requirements
• AD7323 Evaluation Software
Reference Materials
Technical Articles
• MS-2210: Designing Power Supplies for High Speed ADC
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Analog Devices AD7323
AD7323
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
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 ...................... 34
1/10—Rev. 0 to Rev. A
Changes to Features and General Description Sections.............. 1
Changes to Power Requirements, Normal Mode (Operational),
ICC and IDRIVE Parameter; and Power Dissipation, Normal Mode
(Operational) Parameter, Table 2 ................................................... 5
Changes to Endnote 1, Table 4........................................................ 8
Changes to Table 6, Figure 23, and Figure 24 ............................. 16
Changes to Figure 25, Figure 26, and Figure 29 ......................... 17
Data Sheet
Control Register ......................................................................... 23
Sequence Register....................................................................... 25
Range Register ............................................................................ 25
Sequencer Operation ..................................................................... 26
Reference ..................................................................................... 28
VDRIVE............................................................................................ 28
Modes of Operation ....................................................................... 29
Normal Mode (PM1 = PM0 = 0) ............................................. 29
Full Shutdown Mode (PM1 = PM0 = 1) ................................. 29
Autoshutdown Mode (PM1 = 1, PM0 = 0)............................. 30
Autostandby Mode (PM1 = 0, PM0 = 1) ................................ 30
Power vs. Throughput Rate....................................................... 31
Serial Interface ................................................................................ 32
Microprocessor Interfacing........................................................... 33
AD7323 to ADSP-21xx.............................................................. 33
AD7323 to ADSP-BF53x ........................................................... 33
Application Hints ........................................................................... 34
Layout and Grounding .............................................................. 34
Power Supply Configuration .................................................... 34
Outline Dimensions ....................................................................... 35
Ordering Guide .......................................................................... 35
Changes to Figure 30...................................................................... 18
Changes to Figure 33 and Figure 34............................................. 19
Changes to Figure 39...................................................................... 20
Changes to Figure 40 and Figure 41............................................. 21
Changes to Autostandby Mode (PM1 = 0, PM0 = 1) Section .. 30
Changes to Table 14 and Table 15 ................................................ 33
Added Power Supply Configuration Section.............................. 34
Added Figure 54; Renumbered Sequentially .............................. 34
Added Table 16; Renumbered Sequentially ................................ 34
Changes to Ordering Guide .......................................................... 35
1/06—Revision 0: Initial Version
Rev. B | Page 2 of 36







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