Voltage Output Temperature Sensor
with Signal Conditioning
AD22100
FUNCTIONAL BLOCK DIAGRAM
FEATURES
V+
200°C temperature span
Accuracy better than 2ꢀ of full scale
Linearity better than 1ꢀ of full scale
Temperature coefficient of 22.5 mV/°C
Output proportional to temperature × V+
Single-supply operation
V
OUT
R
T
Reverse voltage protection
Minimal self-heating
High level, low impedance output
Figure 1.
APPLICATIONS
HVAC systems
+5V
System temperature compensation
Board level temperature sensing
Electronic thermostats
REFERENCE
ANALOG-TO-
DIGITAL
CONVERTER
MARKETS
SIGNAL OUTPUT
DIRECT TO ADC
AD22100
V
O
Industrial process control
Instrumentation
Automotive
INPUT
1k
0.1F
–50C TO +150C
GENERAL DESCRIPTION
The AD22100 is a monolithic temperature sensor with on-chip
signal conditioning. It can be operated over the temperature
range −50°C to +150°C, making it ideal for use in numerous
HVAC, instrumentation, and automotive applications.
Figure 2. Application Circuit
The signal conditioning eliminates the need for any trimming,
buffering, or linearization circuitry, greatly simplifying the
system design and reducing the overall system cost.
The output voltage is proportional to the temperature x the
supply voltage (ratiometric). The output swings from 0.25 V at
−50°C to +4.75 V at +150°C using a single +5.0 V supply.
Due to its ratiometric nature, the AD22100 offers a cost-
effective solution when interfacing to an analog-to-digital
converter. This is accomplished by using the ADC’s +5 V
power supply as a reference to both the ADC and the AD22100
eliminating the need for and cost of a precision reference (see
Figure 2).
Rev. D
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