參數(shù)資料
型號(hào): EVAL-AD7321CB
廠商: Analog Devices, Inc.
英文描述: 500 kSPS, 2-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
中文描述: 500 kSPS的,雙通道,軟件選擇,真雙極性輸入,12位ADC的加號(hào)
文件頁數(shù): 1/36頁
文件大?。?/td> 453K
代理商: EVAL-AD7321CB
500 kSPS, 2-Channel, Software-Selectable,
True Bipolar Input, 12-Bit Plus Sign ADC
AD7321
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
Two analog input channels with channel sequencer
Single-ended, true differential, and pseudo differential
analog input capability
High analog input impedance
Low power: 17 mW
Full power signal bandwidth: 22 MHz
Internal 2.5 V reference
High speed serial interface
Power-down modes
14-lead TSSOP package
i
CMOS
process technology
GENERAL DESCRIPTION
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.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
2006 Analog Devices, Inc. All rights reserved.
www.analog.com
FUNCTIONAL BLOCK DIAGRAM
V
IN
0
DOUT
SCLK
CS
DIN
V
DRIVE
V
IN
1
V
DD
REFIN/OUT
V
CC
AGND
V
SS
DGND
AND REGISTERS
ASUADC
T/H
2.5V
I/P
SCHANNEL
AD7321
0
Figure 1.
PRODUCT HIGHLIGHTS
1.
The AD7321 can accept true bipolar analog input signals,
±10 V, ±5 V, ±2.5 V, and 0 V to +10 V unipolar signals.
The AD7321
1
is a 2-channel, 12-bit plus sign successive
approximation ADC designed on the
i
CMOS (industrial
CMOS) process.
i
CMOS 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,
i
CMOS
components can accept bipolar input signals while providing
increased performance, dramatically reduced power
consumption, and reduced package size.
2.
The two analog inputs can be configured as two single-
ended inputs, one true differential input pair, or one
pseudo differential input.
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.
Table 1. Similar Devices
Device
Number
Rate
AD7329
1000 kSPS
AD7328
1000 kSPS
AD7327
500 kSPS
AD7324
1000 kSPS
AD7323
500 kSPS
AD7322
1000 kSPS
Channel sequencer.
The AD7321 can accept true bipolar analog input signals. The
AD7321 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 AD7321 can be programmed
to be single-ended, true differential, or pseudo differential.
Throughput
Number of bits
Number of
Channels
8
8
8
4
4
2
12-bit plus sign
12-bit plus sign
12-bit plus sign
12-bit plus sign
12-bit plus sign
12-bit plus sign
The ADC contains a 2.5 V internal reference. The AD7321 also
allows for external reference operation. If a 3 V reference is
applied to the REFIN/OUT pin, the AD7321 can accept a true
bipolar ±12 V analog input. Minimum ±12 V V
DD
and V
SS
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.
1
Protected by U.S. Patent No. 6,731,232.
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