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EVAL-AD7327CB

更新时间： 2024-12-01 05:20:43
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亚德诺 - ADI /
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36页 684K
描述
500 kSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC

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500 kSPS, 8-Channel, Software-Selectable,  
True Bipolar Input, 12-Bit Plus Sign ADC  
AD7327  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
V
REFIN/OUT  
V
12-bit plus sign SAR ADC  
DD  
CC  
True bipolar input ranges  
AD7327  
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  
V
V
V
V
V
V
V
V
0
1
2
3
4
5
6
7
IN  
IN  
IN  
IN  
IN  
IN  
IN  
IN  
2.5V  
VREF  
13-BIT  
I/P  
SUCCESSIVE  
APPROXIMATION  
ADC  
T/H  
MUX  
TEMPERATURE  
INDICATOR  
DOUT  
SCLK  
CS  
CONTROL LOGIC  
AND REGISTERS  
CHANNEL  
SEQUENCER  
DIN  
V
DRIVE  
AGND  
V
DGND  
SS  
20-lead TSSOP package  
iCMOS™ process technology  
Figure 1.  
GENERAL DESCRIPTION  
PRODUCT HIGHLIGHTS  
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  
1. The AD7327 can accept true bipolar analog input signals,  
±1ꢀ V, ±± V, ±2.± V, and ꢀ V to +1ꢀ 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. ±ꢀꢀ kSPS serial interface. SPI®-/QSPI™-/DSP-/MICROWIRE™-  
compatible interface.  
4. Low power, 17 mW, at a maximum throughput rate of  
±ꢀꢀ kSPS.  
consumption, and reduced package size.  
±. Channel sequencer.  
The AD7327 can accept true bipolar analog input signals. The  
AD7327 has four software-selectable input ranges, ±1ꢀ V, ±± V,  
±2.± V, and ꢀ V to +1ꢀ 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.  
Table 1. Similar Devices  
Device Throughput  
Number Rate  
Number of  
Channels  
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  
AD7329  
AD7328  
AD7324  
AD7323  
AD7322  
AD7321  
1000 kSPS  
8
8
4
4
2
2
1000 kSPS  
1000 kSPS  
500 kSPS  
1000 kSPS  
500 kSPS  
The ADC contains a 2.± 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 ±ꢀꢀ kSPS.  
1 Protected by U.S. Patent No. 6,731,232.  
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 registeredtrademarks arethe 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  
www.analog.com  
©2006 Analog Devices, Inc. All rights reserved.  
 
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