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AD7321 Datasheet

12-Bit Plus Sign ADC

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Data Sheet
500 kSPS, 2-Channel, Software-Selectable,
True Bipolar Input, 12-Bit Plus Sign ADC
AD7321
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
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
GENERAL DESCRIPTION
The AD73211 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 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.
FUNCTIONAL BLOCK DIAGRAM
VDD REFIN/OUT VCC
AD7321
VIN0
VIN1
I/P
MUX
2.5V
VREF
T/H
13-BIT
SUCCESSIVE
APPROXIMATION
ADC
CHANNEL
SEQUENCER
CONTROL LOGIC
AND REGISTERS
DOUT
SCLK
CS
DIN
VDRIVE
AGND
VSS DGND
Figure 1.
PRODUCT HIGHLIGHTS
1. The AD7321 can accept true bipolar analog input signals,
±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals.
2. The two analog inputs are configured as two single-ended
inputs, one true differential input pair, or one pseudo
differential input.
3. A 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
AD7323 500 kSPS
AD7322 1000 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
4
2
1 Protected by U.S. Patent No. 6,731,232.
Rev. B
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2006–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD7321 Datasheet

12-Bit Plus Sign ADC

No Preview Available !

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
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
Data Sheet
Control Register ......................................................................... 23
Range Register ............................................................................ 25
Sequencer Operation ..................................................................... 26
Reference ..................................................................................... 27
VDRIVE............................................................................................ 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
Rev. B | Page 2 of 36


Part Number AD7321
Description 12-Bit Plus Sign ADC
Maker Analog Devices
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