LTC2997_15 Datasheet, PDF (1/18 Pages) Linear Technology – Remote/Internal Temperature Sensor

FEATURES
n _{Converts Remote Sensor or Internal Diode}
Temperature to Analog Voltage
n _{±1°C Remote Temperature Accuracy}
n _{±1.5°C Internal Temperature Accuracy}
n _{Built-In Series Resistance Cancellation}
n _{2.5V to 5.5V Supply Voltage}
n _{1.8V Reference Voltage Output}
n _{3.5ms VPTAT Update Time}
n _{4mV/°K Output Gain}
n _{170μA Quiescent Current}
n _{Available in 6-Pin 2mm × 3mm DFN Package}
APPLICATIONS
n _{Temperature Measurement}
n _{Remote Temperature Measurement}
n _{Environmental Monitoring}
n _{System Thermal Control}
n _{Desktop and Notebook Computers}
n _{Network Servers}
LTC2997
Remote/Internal
Temperature Sensor
DESCRIPTION
The LTC^®2997 is a high-accuracy analog output temperature
sensor. It converts the temperature of an external sensor or
its own temperature to an analog voltage output. A built-in
algorithm eliminates errors due to series resistance be-
tween the LTC2997 and the sensor diode.
The LTC2997 gives accurate results with low-cost diode-
connected NPN or PNP transistors or with integrated
temperature transistors on microprocessors or FPGAs.
Tying pin D⁺ to V_CC configures the LTC2997 to measure
its internal temperature.
The LTC2997 provides an additional 1.8V reference voltage
output which can be used as an ADC reference input or
for generating temperature threshold voltages to compare
against the V_PTAT output.
The LTC2997 provides a precise and versatile micropower
solution for accurate temperature sensing.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Single Remote Temperature Sensor
2.5V TO 5.5V
0.1μF
MMBT 3904
D⁺
470pF
D^–
VCC
LTC2997
VREF ^1.8V
GND
VPTAT ^4mV/K
2997 TA01a
V_PTAT vs Remote Sensor Temperature
1.8
1.6
1.4
1.2
1.0
0.8
–50 –25 0 25 50 75 100 125 150
REMOTE SENSOR TEMPERATURE (°C)
2997 TA01b
2997fa
1