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AD7328 Datasheet

12-Bit Plus Sign ADC

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Data Sheet
8-Channel, Software-Selectable,
True Bipolar Input, 12-Bit Plus Sign ADC
AD7328
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
1 MSPS throughput rate
8 analog input channels with channel sequencer
Single-ended, true differential, and pseudo differential
analog input capability
High analog input impedance
Low power: 21 mW
Temperature indicator
Full power signal bandwidth: 22 MHz
Internal 2.5 V reference
High speed serial interface
Power-down modes
20-lead TSSOP package
iCMOS process technology
FUNCTIONAL BLOCK DIAGRAM
VDD
REFIN/OUT VCC
AD7328
VIN0
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
I/P
MUX
CHANNEL
SEQUENCER
2.5V
VREF
T/H
13-BIT
SUCCESSIVE
APPROXIMATION
ADC
TEMPERATURE
INDICATOR
CONTROL LOGIC
AND REGISTERS
DOUT
SCLK
CS
DIN
AGND
VSS DGND
Figure 1.
VDRIVE
GENERAL DESCRIPTION
The AD73281 is an 8-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 AD7328 can accept true bipolar analog input signals. The
AD7328 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 AD7328 can be programmed to be
single-ended, true differential, or pseudo differential.
The ADC contains a 2.5 V internal reference. The AD7328 also
allows for external reference operation. If a 3 V reference is applied
to the REFIN/OUT pin, the AD7328 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 1 MSPS.
PRODUCT HIGHLIGHTS
1. The AD7328 can accept true bipolar analog input signals,
±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals.
2. The eight analog inputs can be configured as eight single-
ended inputs, four true differential input pairs, four pseudo
differential inputs, or seven pseudo differential inputs.
3. 1 MSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-
compatible interface.
4. Low power, 31 mW, at a maximum throughput rate of
1 MSPS.
5. Channel sequencer.
Table 1. Similar Product Selection
Device Throughput
Number Rate
Number of Bits
AD7329 1000 kSPS
12-bit plus sign
AD7327 500 kSPS
12-bit plus sign
AD7324 1000 kSPS
12-bit plus sign
AD7323 500 kSPS
12-bit plus sign
AD7322 1000 kSPS
12-bit plus sign
AD7321 500 kSPS
12-bit plus sign
Number of
Channels
8
8
4
4
2
2
1 Protected by U.S. Patent No. 6,731,232.
Rev. C
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 ©2005–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD7328 Datasheet

12-Bit Plus Sign ADC

No Preview Available !

AD7328
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Timing Specifications .................................................................. 6
Absolute Maximum Ratings............................................................ 7
ESD Caution.................................................................................. 7
Pin Configuration and Function Descriptions............................. 8
Typical Performance Characteristics ............................................. 9
Terminology .................................................................................... 13
Theory of Operation ...................................................................... 15
Circuit Information.................................................................... 15
Converter Operation.................................................................. 15
Analog Input Structure.............................................................. 16
Typical Connection Diagram ................................................... 18
Analog Input ............................................................................... 18
Driver Amplifier Choice............................................................ 20
Registers ........................................................................................... 21
Addressing Registers .................................................................. 21
Control Register.......................................................................... 22
REVISION HISTORY
1/14—Rev. B to Rev. C
Changes to Circuit Information Section and Table 6 ................ 15
Changes to Addressing Registers Section.................................... 21
Changes to Power Supply Configuration Section ...................... 33
Changes to Ordering Guide .......................................................... 34
2/10—Rev. A to Rev. B
Change to Product Highlights Section .......................................... 1
Changes to DC Accuracy Parameter, Test Conditions/
Comments, Table 2....................................................................... 3
Changes to Normal Mode (Operational) ICC and IDRIVE
Parameter and to Power Dissipation Normal Mode
Parameter, Table 2 ........................................................................ 5
Changes to Table 14 and Table 15 ................................................ 32
Added Power Supply Configuration Section and Figure 56 ..... 33
Changes to Ordering Guide .......................................................... 34
Data Sheet
Sequence Register....................................................................... 24
Range Registers........................................................................... 24
Sequencer Operation ..................................................................... 25
Reference ..................................................................................... 27
VDRIVE............................................................................................ 27
Temperature Indicator............................................................... 27
Modes of Operation ....................................................................... 28
Normal Mode (PM1 = PM0 = 0) ............................................. 28
Full Shutdown Mode (PM1 = PM0 = 1) ................................. 28
Autoshutdown Mode (PM1 = 1, PM0 = 0)............................. 29
Autostandby Mode (PM1 = 0, PM0 = 1) ................................ 29
Power vs. Throughput Rate....................................................... 30
Serial Interface ................................................................................ 31
Microprocessor Interfacing........................................................... 32
AD7328 to ADSP-21xx.............................................................. 32
AD7328 to ADSP-BF53x ........................................................... 32
Applications Information .............................................................. 33
Layout and Grounding .............................................................. 33
Power Supply Configuration .................................................... 33
Outline Dimensions ....................................................................... 34
Ordering Guide .......................................................................... 34
6/06—Rev. 0 to Rev. A
Changes to Table 1.............................................................................1
Changes to Specifications.................................................................3
Added Thermal Hysteresis to Terminology Section.................. 14
Change to Figure 42 ....................................................................... 20
Change to Control Register Section............................................. 23
10/05—Revision 0: Initial Version
Rev. C | Page 2 of 36


Part Number AD7328
Description 12-Bit Plus Sign ADC
Maker Analog Devices
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AD7328 Datasheet PDF






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