ADT70GR Fast Delivery |IC PHOENIX CO.,LIMITED

ADT70GR ,PRTD Conditioning Circuit and Temperature ControllerGENERAL DESCRIPTION SENSEThe ADT70 provides excitation and signal conditioning forPIN CONFIGURATION ..
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ADT70GR
PRTD Conditioning Circuit and Temperature Controller
FUNCTIONAL BLOCK DIAGRAM
PIN CONFIGURATIONS
20-Lead P-DIP
(N Suffix)
SHUTDOWN
–VS
+INOA
–INOA
VOUT OA
+VS
AGND
VREFOUT
BIAS
VOUT IA
DGND
NULLA
NULLB
IOUTA
IOUTB
–INIA
+INIARGA
RGB
GND SENSE
20-Lead SOIC
(R Suffix)
–VS
+INOA
–INOA
VOUT OA
+VS
AGND
VREFOUT
BIAS
VOUT IA
DGND
SHUTDOWNNULLA
NULLB
IOUTA
IOUTB
2 INIA
1 INIARGA
RGB
GND SENSE
REV.0PRTD Conditioning Circuit
and Temperature Controller
FEATURES
PRTD Temperature Measurement Range
Typical IC Measurement Error 618C
Includes Two Matched Current Sources
Rail-to-Rail Output Instrumentation Amp
Uncommitted, Rail-to-Rail Output Op Amp
On-Board 12.5 V Reference
Temperature Coefficient 625 ppm/8C
15 V or 65 V Operation
Supply Current 4 mA Max
10 mA Max in Shutdown
APPLICATIONS
Temperature Controllers
Portable Instrumentation
Temperature Acquisition Cards
GENERAL DESCRIPTION
The ADT70 provides excitation and signal conditioning for
resistance-temperature devices (RTDs). It is ideally suited for
1 kW Platinum RTDs (PRTDs), allowing a very wide range of
temperature measurement. It can also easily interface to 100 W
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.
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␣mA. 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.
The ADT70 is specified for operation from 240°C to 1125°C
and is available in 20-lead DIP and SO packages.
*Patent pending.
CURRENT SOURCES
VOLTAGE REFERENCE
SHUTDOWN INPUT
POWER SUPPLY
Specifications subject to change without notice.
ADT70–SPECIFICATIONS
(VS = 15 V, 2408C £ TA £ 11258C unless otherwise noted)
ORDERING GUIDE
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116 V
Output Short-Circuit Duration. . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range
N, R Package. . . . . . . . . . . . . . . . . . . . . . 265°C to 1150°C
Operating Temperature Range. . . . . . . . . . 240°C to 1125°C
Junction Temperature Range
N, R Package. . . . . . . . . . . . . . . . . . . . . . 265°C to 1125°C
Lead Temperature (Soldering, 60 sec). . . . . . . . . . . . 1300°C
NOTE
*Stresses above those listed under Absolute Maximum Ratings may cause perma-
nent damage to the device. This is a stress rating only; functional operation of the
device at these or any other conditions above those listed in the operational sections
of this specification is not implied. Exposure to absolute maximum rating condi-
tions for extended periods may affect device reliability.
NOTEqJA is specified for device in socket/soldered on circuit board (worst case conditions).
TRANSISTOR COUNT: 158
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADT70 features proprietary ESD protection circuitry, permanent damage may
occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.
ADT70
TEMPERATURE – 8C
SUPPLY CURRENT – mA
4.5
Figure 1.Supply Current vs. Temperature
TEMPERATURE – 8C
SYSTEM GAIN – mV/
1.35
Figure 2.System Gain vs. Temperature
TEMPERATURE – 8C
SYSTEM GAIN PSRR – %/V
2252575125
0.1
Figure 3.Total System Gain PSRR vs. Temperature
TEMPERATURE – 8C
INSTRUMENTATION AMPLIFIER INPUT
OFFSET VOLTAGE –
2252575125
100
Figure 4.Instrumentation Amplifier Input Offset Voltage
vs. Temperature
TEMPERATURE – 8C
INSTRUMENTATION AMPLIFIER OUTPUT
OFFSET VOLTAGE – mV
2252575125
210
Figure 5.Instrumentation Amplifier Output Offset Voltage
vs. Temperature
TEMPERATURE – 8C
INSTRUMENTATION AMPLIFIER INPUT
BIAS CURRENT – nA
2252575125
260
Figure 6.Instrumentation Amplifier Input Bias Current vs.
Temperature
TEMPERATURE – 8C
INSTRUMENTATION AMPLIFIER INPUT
OFFSET CURRENT – pA
2252575125
400
Figure 7.Instrumentation Amplifier Input Offset Current
vs. Temperature
TEMPERATURE – 8C
INSTRUMENTATION AMPLIFIER GAIN – V/V
1.6
Figure 8.Instrumentation Amplifier Gain vs. Temperature
TEMPERATURE – 8C
OP AMP INPUT OFFSET VOLTAGE –
2252575125
100
Figure 9.Op Amp Input Offset Voltage vs. Temperature
TEMPERATURE – 8C
OP AMP INPUT BIAS CURRENT – nA
2252575125
260
Figure 10.Op Amp Input Bias Current vs. Temperature
TEMPERATURE – 8C
OP AMP INPUT OFFSET CURRENT – pA
400
Figure 11.Op Amp Input Offset Current vs. Temperature
TEMPERATURE – 8C
REFERENCE VOLTAGE – V
2.51
Figure 12.Reference Voltage vs. Temperature
ADT70
Figure 13.Op Amp Output Voltage from Rails vs.
Load Current
LOAD CURRENT – mA
REFERENCE VOLTAGE – V
2.52
Figure 14.Reference Voltage vs. Load Current
SUPPLY VOLTAGE – Volts4.5
ISY
, SUPPLY CURRENT – mA
3.8
Figure 15.Supply Current vs. Supply Voltage
SUPPLY VOLTAGE – Volts
OUTPUT OF CURRENT SOURCE –
4.55.05.255.5
Figure 16.Output of Current Source vs. Supply Voltage
FREQUENCY – Hz10
CMRR – dB
1001k10k100k1M
140
Figure 17.In Amp CMRR vs. Frequency
FREQUENCY – Hz
GAIN – dB
2801k10k100k1M10M
120
PHASE MARGIN – Degrees
270
Figure 18.Op Amp Open Loop Gain and Phase vs.
Frequency
Figure 22.Op Amp CMRR vs. Frequency
Figure 23.Op Amp PSRR vs. Frequency
Figure 24.Op Amp Closed Loop Gain vs. Frequency
FREQUENCY – Hz
PSRR – dB
1001k10k100k1M220
140
Figure 19.In Amp PSRR vs. Frequency – AV = 1.4
FREQUENCY – Hz
PSRR – dB
1001k10k100k1M220
140
Figure 20.In Amp PSRR vs. Frequency – AV = 14
FREQUENCY – Hz
CLOSED LOOP GAIN – dB
2601k10k100k1M10M
100
Figure 21.In Amp Closed Loop Gain vs. Frequency

Partno	Mfg	Dc	Qty	Available	Descript
ADT70GR	AD	N/a	79	avai	PRTD Conditioning Circuit and Temperature Controller