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Analog Devices Semiconductor Electronic Components Datasheet

AD7329 Datasheet

12-Bit Plus Sign ADC

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Data Sheet
1 MSPS, 8-Channel, Software-Selectable,
True Bipolar Input, 12-Bit Plus Sign ADC
AD7329
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
MUXOUT and ADCIN pins allow separate access to mux and ADC
Low power: 21 mW
Temperature indicator
Full power signal bandwidth: 20 MHz
Internal 2.5 V reference
High speed serial interface
iCMOS process technology
24-lead TSSOP package
Power-down modes
FUNCTIONAL BLOCK DIAGRAM
MUXOUT+ MUXOUTADCIN– ADCIN+ VDD
REFIN/REFOUT VCC
VIN0
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
I/P
MUX
CHANNEL
SEQUENCER
AD7329
2.5V
VREF
13-BIT SUCCESSIVE
T/H APPROXIMATION
ADC
VSS
Figure 1.
CONTROL
LOGIC AND
REGISTERS
AGND
VDRIVE
DOUT
SCLK
CS
DIN
GENERAL DESCRIPTION
The AD73291 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
CMOS and low voltage CMOS. 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 AD7329 can accept true bipolar analog input signals. The
AD7329 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 AD7329 can be programmed
to be single-ended, true differential, or pseudo differential.
The ADC contains a 2.5 V internal reference. The AD7329 also
allows for external reference operation. If a 3 V reference is
applied to the REFIN/REFOUT pin, the AD7329 can accept a true
bipolar ±12 V analog input. The ADC has a high speed serial
interface that can operate at throughput rates up to 1 MSPS.
PRODUCT HIGHLIGHTS
1. The AD7329 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, 21 mW, at 1 MSPS.
5. The MUXOUT± and ADCIN± pins allow for signal conditioning
of the mux output prior to entering the ADC.
Table 1. Similar Devices
Device
Number Throughput Rate
AD7328 1000 kSPS
AD7327 500 kSPS
AD7324 1000 kSPS
AD7323 500 kSPS
AD7322 1000 kSPS
AD7321 500 kSPS
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 ©2006–2014 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

AD7329 Datasheet

12-Bit Plus Sign ADC

No Preview Available !

AD7329
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 ........................................... 11 
Terminology .................................................................................... 15 
Theory of Operation ...................................................................... 17 
Circuit Information.................................................................... 17 
Converter Operation.................................................................. 17 
Output Coding............................................................................ 18 
Transfer Functions...................................................................... 18 
Analog Input Structure.............................................................. 18 
Track-and-Hold Section ............................................................ 19 
Typical Connection Diagram ................................................... 20 
Analog Input ............................................................................... 20 
Driver Amplifier Choice............................................................ 23 
Registers ........................................................................................... 25 
REVISION HISTORY
12/14—Rev. B to Rev. C
Change to Specifications Section.................................................... 3
Change to Timing Specifications Section...................................... 7
Changes to Table 5.......................................................................... 10
Changes to Pseudo Differential Inputs Section.......................... 22
1/14—Rev. A to Rev. B
Changes to Circuit Information Section and Table 6 ................ 17
Changes to Addressing Registers Section.................................... 25
Changes to Power Supply Configuration Section ...................... 37
Changes to Ordering Guide .......................................................... 38
Data Sheet
Addressing Registers.................................................................. 25 
Control Register ......................................................................... 26 
Sequence Register....................................................................... 28 
Range Registers........................................................................... 28 
Sequencer Operation ..................................................................... 29 
Reference ..................................................................................... 31 
VDRIVE............................................................................................ 31 
Temperature Indicator............................................................... 31 
Modes of Operation ....................................................................... 32 
Normal Mode (PM1 = PM0 = 0) ............................................. 32 
Full Shutdown Mode (PM1 = PM0 = 1) ................................. 32 
Autoshutdown Mode (PM1 = 1, PM0 = 0)............................. 33 
Autostandby Mode (PM1 = 0, PM0 =1) ................................. 33 
Power vs. Throughput Rate....................................................... 34 
Serial Interface ................................................................................ 35 
Microprocessor Interfacing........................................................... 36 
AD7329 to ADSP-21xx.............................................................. 36 
AD7329 to ADSP-BF53x ........................................................... 36 
Applications Information .............................................................. 37 
Layout and Grounding .............................................................. 37 
Power Supply Configuration .................................................... 37 
Outline Dimensions ....................................................................... 38 
Ordering Guide .......................................................................... 38 
2/10—Rev. 0 to Rev. A
Changes to DC Accuracy Parameter, Test Conditions/
Comments, Table 2............................................................................4
Change to Normal Mode (Operational) ICC and IDRIVE
Parameter and to Power Dissipation Normal Mode
Parameter, Table 2 .............................................................................6
Changes to Table 16 and Table 17 ................................................ 36
Added Applications Information Section, Figure 60,
and Table 18 .................................................................................... 37
Changes to Ordering Guide .......................................................... 38
4/06—Revision 0: Initial Version
Rev. C | Page 2 of 38


Part Number AD7329
Description 12-Bit Plus Sign ADC
Maker Analog Devices
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AD7329 Datasheet PDF






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