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EVAL-AD7328CB

更新时间： 2024-12-01 05:20:43
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亚德诺 - ADI /
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36页 769K
描述
8-Channel, Software-Selectable True Bipolar Input, 12-Bit Plus Sign ADC

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8-Channel, Software-Selectable True  
Bipolar Input, 12-Bit Plus Sign ADC  
AD7328  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
V
REFIN/OUT  
V
DD  
CC  
12-bit plus sign SAR ADC  
True bipolar input ranges  
AD7328  
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  
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  
MUX  
SUCCESSIVE  
APPROXIMATION  
ADC  
T/H  
TEMPERATURE  
INDICATOR  
High analog input impedance  
Low power: 21 mW  
Temperature indicator  
DOUT  
SCLK  
CS  
CONTROL LOGIC  
AND REGISTERS  
CHANNEL  
SEQUENCER  
DIN  
Full power signal bandwidth: 22 MHz  
Internal 2.5 V reference  
High speed serial interface  
Power-down modes  
20-lead TSSOP package  
iCMOS™ process technology  
V
DRIVE  
AGND  
V
DGND  
SS  
Figure 1.  
PRODUCT HIGHLIGHTS  
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.  
1. The AD7328 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 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, 3ꢀ mW, at a maximum throughput rate of  
1 MSPS.  
±. Channel sequencer.  
The AD7328 can accept true bipolar analog input signals. The  
AD7328 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 AD7328 can be programmed to be  
single-ended, true differential, or pseudo differential.  
Table 1. Similar Product Selection  
Device  
Number  
Throughput  
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  
AD7327  
AD7324  
AD7323  
AD7322  
AD7321  
1000 kSPS  
500 kSPS  
1000 kSPS  
500 kSPS  
1000 kSPS  
500 kSPS  
8
8
4
4
2
2
The ADC contains a 2.± 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.  
1 Protected by U.S. Patent No. 6,731,232.  
Rev. A  
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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