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AD7327 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD7327
Description  500 kSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7327 Datasheet(HTML) 1 Page - Analog Devices

 
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500 kSPS, 8-Channel, Software-Selectable,
True Bipolar Input, 12-Bit Plus Sign ADC
AD7327
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
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
Eight analog input channels with channel sequencer
Single-ended, true differential, and pseudo differential
analog input capability
High analog input impedance
Low power: 17 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
iCMOSprocess technology
FUNCTIONAL BLOCK DIAGRAM
VIN0
DOUT
SCLK
CS
DIN
VDRIVE
VIN1
VIN2
VIN3
VIN4
VIN5
VIN6
VIN7
VDD
REFIN/OUT
VCC
AGND
VSS
DGND
CONTROL LOGIC
AND REGISTERS
13-BIT
SUCCESSIVE
APPROXIMATION
ADC
T/H
2.5V
VREF
I/P
MUX
CHANNEL
SEQUENCER
AD7327
TEMPERATURE
INDICATOR
Figure 1.
GENERAL DESCRIPTION
The AD73271 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 AD7327 can accept true bipolar analog input signals. The
AD7327 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 AD7327 can be programmed
to be single-ended, true differential, or pseudo differential.
The ADC contains a 2.5 V internal reference. The AD7327 also
allows for external reference operation. If a 3 V reference is
applied to the REFIN/OUT pin, the AD7327 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.
PRODUCT HIGHLIGHTS
1.
The AD7327 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 inputs, four pseudo
differential inputs, or seven pseudo differential inputs.
3.
500 kSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-
compatible interface.
4.
Low power, 17 mW, at a maximum throughput rate of
500 kSPS.
5.
Channel sequencer.
Table 1. Similar Devices
Device
Number
Throughput
Rate
Number of bits
Number of
Channels
AD7329
1000 kSPS
12-bit plus sign
8
AD7328
1000 kSPS
12-bit plus sign
8
AD7324
1000 kSPS
12-bit plus sign
4
AD7323
500 kSPS
12-bit plus sign
4
AD7322
1000 kSPS
12-bit plus sign
2
AD7321
500 kSPS
12-bit plus sign
2
1 Protected by U.S. Patent No. 6,731,232.


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