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ADT70*

更新时间： 2024-11-22 23:28:07
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14页 154K
描述
PRTD Conditioning Circuit and Temperature Controller

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ADT70* 数据手册

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PRTD Conditioning Circuit  
and Temperature Controller  
a
ADT70*  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
PRTD Temperature Measurement Range  
Typical IC Measurement Error ؎1؇C  
Includes Two Matched Current Sources  
Rail-to-Rail Output Instrumentation Amp  
Uncommitted, Rail-to-Rail Output Op Amp  
On-Board ؉2.5 V Reference  
Temperature Coefficient ؎25 ppm/؇C  
؉5 V or ؎5 V Operation  
Supply Current 4 mA Max  
NULLA  
NULLB  
BIAS 2.5V  
REFOUT  
ADT70  
+V  
S
OUT  
OA  
OA  
MATCHED  
CURRENT  
SOURCES  
I
I
OUTA  
+IN  
OA  
OUTB  
2.5V  
REF  
؊IN  
10 ␮A Max in Shutdown  
+IN  
IA  
APPLICATIONS  
INST  
AMP  
SHUT-  
DOWN  
SHUTDOWN  
Temperature Controllers  
Portable Instrumentation  
Temperature Acquisition Cards  
؊IN  
IA  
RGA RGB GND  
OUT  
IA  
AGND ؊V  
DGND  
S
SENSE  
GENERAL DESCRIPTION  
The ADT70 provides excitation and signal conditioning for  
resistance-temperature devices (RTDs). It is ideally suited for  
1 kΩ Platinum RTDs (PRTDs), allowing a very wide range of  
temperature measurement. It can also easily interface to 100 Ω  
PRTDs. Using a remote, low cost thin-film PRTD, the ADT70  
can measure temperature in the range of –50°C to +500°C.  
With high performance platinum elements, the temperature  
change can be extended to 1000°C. Accuracy of the ADT70  
and PRTD system over a –200°C to +1000°C temperature  
range heavily depends on the quality of the PRTD. Typically  
the ADT70 will introduce an error of only ±1°C over the  
transducer's temperature range, and the error may be trimmed  
to zero at a single calibration point.  
PIN CONFIGURATIONS  
20-Lead P-DIP  
(N Suffix)  
–V  
+V  
V
20  
19  
18  
17  
16  
1
2
S
S
AGND  
OUT OA  
V
–IN  
3
REFOUT  
BIAS  
OA  
+IN  
4
OA  
NULLA  
NULLB  
ADT70  
5
SHUTDOWN  
TOP VIEW  
DGND  
6
(Not to Scale) 15  
V
I
14  
13  
12  
7
OUT IA  
OUTA  
GND SENSE  
RGB  
I
8
OUTB  
The ADT70 consists of two matched 1 mA (nominal) current  
sources for transducer and reference resistor excitation, a preci-  
sion rail-to-rail output instrumentation amplifier, a 2.5 V refer-  
ence and an uncommitted rail-to-rail output op amp. The  
ADT70 includes a shutdown function for battery powered  
equipment, which reduces the quiescent current from 4 mA to  
less than 10 µA. The ADT70 operates from either single +5 V  
or ±5 V supplies. Gain or full-scale range for the PRTD and  
ADT70 system is set by a precision external resistor connected  
to the instrumentation amplifier. The uncommitted op amp may  
be used for scaling the internal voltage reference, providing a  
“PRTD open” signal or “over-temperature” warning, a heater  
switching signal, or other external conditioning determined by  
the user.  
–IN  
IA  
9
RGA  
+IN  
IA  
10  
11  
a
20-Lead SOIC  
(R Suffix)  
–V  
S
+V  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
1
2
S
AGND  
V
OUT OA  
V
–IN  
+IN  
3
REFOUT  
OA  
OA  
BIAS  
4
NULLA  
NULLB  
5
ADT70  
TOP VIEW  
(Not to Scale)  
SHUTDOWN  
DGND  
6
V
The ADT70 is specified for operation from ؊40°C to ؉125°C  
and is available in 20-lead DIP and SO packages.  
I
7
OUT IA  
OUTA  
GND SENSE  
RGB  
I
8
OUTB  
9
؊ IN  
؉ IN  
IA  
RGA  
10  
*
Patent pending.  
IA  
a
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  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781/329-4700  
Fax: 781/326-8703  
World Wide Web Site: http://www.analog.com  
© Analog Devices, Inc., 1998  
1234567...14

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