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AD7328 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD7328
Description  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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AD7328 Datasheet(HTML) 1 Page - Analog Devices

 
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8-Channel, Software-Selectable True
Bipolar Input, 12-Bit Plus Sign ADC
AD7328
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother
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
1 MSPS 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: 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
iCMOSprocess technology
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.
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
AD7328
TEMPERATURE
INDICATOR
Figure 1.
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, 30 mW, at a maximum throughput rate of
1 MSPS.
5.
Channel sequencer.
Table 1. Similar Product Selection
Device
Number
Throughput
Rate
Number of Bits
Number of
Channels
AD7329
1000 kSPS
12-bit plus sign
8
AD7327
500 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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