AD22105AR-REEL7 Analog Devices Inc, AD22105AR-REEL7 Datasheet

IC,TEMPERATURE SENSOR,BIPOLAR,SOP,8PIN,PLASTIC

AD22105AR-REEL7

Manufacturer Part Number
AD22105AR-REEL7
Description
IC,TEMPERATURE SENSOR,BIPOLAR,SOP,8PIN,PLASTIC
Manufacturer
Analog Devices Inc
Datasheet

Specifications of AD22105AR-REEL7

Rohs Status
RoHS non-compliant
Sensing Temperature
-40°C ~ 150°C
Output Type
Open Collector
Voltage - Supply
2.7 V ~ 7 V
Accuracy
±0.5°C
Package / Case
8-SOIC (0.154", 3.90mm Width)
Lead Free Status / RoHS Status
a
GENERAL DESCRIPTION
The AD22105 is a solid state thermostatic switch. Requiring
only one external programming resistor, the AD22105 can be set
to switch accurately at any temperature in the wide operating
range of –40 C to +150 C. Using a novel circuit architecture,
the AD22105 asserts an open collector output when the ambient
temperature exceeds the user-programmed setpoint temperature.
The AD22105 has approximately 4 C of hysteresis which prevents
rapid thermal on/off cycling.
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.
FEATURES
User-Programmable Temperature Setpoint
2.0 C Setpoint Accuracy
4.0 C Preset Hysteresis
Wide Supply Range (+2.7 V dc to +7.0 V dc)
Wide Temperature Range (–40 C to +150 C)
Low Power Dissipation (230 W @ 3.3 V)
APPLICATIONS
Industrial Process Control
Thermal Control Systems
CPU Monitoring (i.e., Pentium)
Computer Thermal Management Circuits
Fan Control
Handheld/Portable Electronic Equipment
OUT
Figure 1. Typical Application Circuit
Low Voltage, Resistor Programmable
8
1
+2.7V TO +7.0V
AD22105
7
2
TOP VIEW
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
The AD22105 is designed to operate on a single power supply
voltage from +2.7 V to +7.0 V facilitating operation in battery
powered applications as well as in industrial control systems.
Because of low power dissipation (230 W @ 3.3 V), self-
heating errors are minimized and battery life is maximized.
An optional internal 200 k
facilitate driving light loads such as CMOS inputs.
Alternatively, a low power LED indicator may be driven directly.
6
3
R
PULL–UP
5
4
OUT
GND
FUNCTIONAL BLOCK DIAGRAM
NC
1
2
3
4
R
SET
Thermostatic Switch
200k
TEMPERATURE
pull-up resistor is included to
AD22105
SENSOR
POINT
SET–
© Analog Devices, Inc., 1996
AD22105
Fax: 617/326-8703
7
8
6
5
NC
R
V
NC
SET
S

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AD22105AR-REEL7 Summary of contents

Page 1

FEATURES User-Programmable Temperature Setpoint 2.0 C Setpoint Accuracy 4.0 C Preset Hysteresis Wide Supply Range (+2 +7.0 V dc) Wide Temperature Range (– +150 C) Low Power Dissipation (230 W @ 3.3 V) APPLICATIONS ...

Page 2

AD22105–SPECIFICATIONS Parameter TEMPERATURE ACCURACY Ambient Setpoint Accuracy Temperature Setpoint Accuracy Power Supply Rejection HYSTERESIS Hysteresis Value OPEN COLLECTOR OUTPUT Output Low Voltage POWER SUPPLY Supply Range Supply Current, Output “LOW” Supply Current, Output “HIGH” INTERNAL PULL-UP RESISTOR TURN-ON SETTLING TIME ...

Page 3

... Package Model Description AD22105AR 8-Lead SOIC AD22105AR-REEL7 8-Lead SOIC CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although the AD22105 features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges ...

Page 4

AD22105–Typical Performance Characteristics 4 GUARANTEED LIMIT (+) –1 –2 –3 GUARANTEED LIMIT (–) –4 –50 – TEMPERATURE – C Figure 3. Error vs. Setpoint 0.1 0.3 0.5 0.7 0.9 1.1 –50 –25 ...

Page 5

T A 0.1 0.0 1µA 10µA 100µA I OUT Figure OUT OUT OUT 400 FLOW RATE – CFM Figure 10. Thermal Response vs. ...

Page 6

AD22105 PRODUCT DESCRIPTION The AD22105 is a single supply semiconductor thermostat switch that utilizes a unique circuit architecture to realize the combined functions of a temperature sensor, setpoint comparator, and output stage all in one integrated circuit. By using one ...

Page 7

OUTPUT SECTION The output of the AD22105 is the collector of an NPN transistor. When the ambient temperature of the device exceeds the programmed setpoint temperature, this transistor is activated causing its collector to become a low impedance. A pull-up ...

Page 8

AD22105 Leakage at the R Pin SET Leakage currents at the R pin, such as those generated from a SET moist environment or printed circuit board contamination, can have an adverse effect on the programmed setpoint temperature of the AD22105. ...

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