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AD7324 Datasheet

  • AD7324

  • 4-Channel, Software Selectable True bipolar Input, 12-Bit Pl...

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4-Channel, Software-Selectable, True
Bipolar Input, 12-Bit Plus Sign ADC
AD7324
FEATURES
12-bit plus sign SAR ADC
True bipolar input ranges
Software-selectable input ranges
卤10 V, 卤5 V, 卤2.5 V, 0 V to +10 V
1 MSPS throughput rate
Four analog input channels with channel sequencer
Single-ended, true differential, and pseudo differential
analog input capability
High analog input impedance
Low power: 21 mW
Full power signal bandwidth: 22 MHz
Internal 2.5 V reference
High speed serial interface
Power-down modes
16-lead TSSOP package
iCMOS
鈩?/div>
process technology
FUNCTIONAL BLOCK DIAGRAM
V
DD
REFIN/OUT
V
CC
AD7324
2.5V
VREF
I/P
MUX
T/H
V
IN
0
V
IN
1
V
IN
2
V
IN
3
13-BIT
SUCCESSIVE
APPROXIMATION
ADC
DOUT
CHANNEL
SEQUENCER
CONTROL LOGIC
AND REGISTERS
SCLK
CS
DIN
V
DRIVE
AGND
V
SS
DGND
04864-001
Figure 1.
GENERAL DESCRIPTION
The AD7324
1
is a 4-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 AD7324 can accept true bipolar analog input signals. The
AD7324 has four software-selectable input ranges, 卤10 V, 卤5 V,
卤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 AD7324 can be programmed
to be single-ended, true differential, or pseudo differential.
The ADC contains a 2.5 V internal reference. The AD7324 also
allows for external reference operation. If a 3 V reference is
applied to the REFIN/OUT pin, the AD7324 can accept a true
bipolar 卤12 V analog input. Minimum 卤12 V V
DD
and V
SS
supplies are required for the 卤12 V input range. The ADC has a
high speed serial interface that can operate at throughput rates
up to 1 MSPS.
Rev. 0
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.
Trademarks and registered trademarks are the property of their respective owners.
PRODUCT HIGHLIGHTS
1.
2.
The AD7324 can accept true bipolar analog input signals,
卤10 V, 卤5 V, 卤2.5 V, and 0 V to +10 V unipolar signals.
The four analog inputs can be configured as four single-
ended inputs, two true differential input pairs, two pseudo
differential inputs, or three pseudo differential inputs.
1 MSPS serial interface. SPI庐-/QSPI鈩?/DSP-/MICROWIRE鈩?
compatible interface.
Low power, 30 mW maximum, at 1 MSPS throughput rate.
Channel sequencer.
Throughput
Rate
250 kSPS
1000 kSPS
500 kSPS
500 kSPS
1000 kSPS
500 kSPS
Number of
Channels
8
8
8
4
2
2
3.
4.
5.
Table 1. Similar Products Selection Table
Device
Number
AD7329
AD7328
AD7327
AD7323
AD7322
AD7321
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
1
Protected by U.S. Patent No. 6,731,232.
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
漏2005 Analog Devices, Inc. All rights reserved.

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