LM34AH
Precision Fahrenheit Temperature Sensors

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Datasheet

Size: 242.44KB
Page: 10
PDF: LM301.pdf
  • Description:
    Precision Fahrenheit Temperature Sensors
  • MFG:
    NSC [National Semiconductor]
 

Abstract


TL/H/6685
LM34/LM34A/LM34C/LM34CA/LM34D
Precision
Fahrenheit
Temperature
Sensors
December 1994
LM34/LM34A/LM34C/LM34CA/LM34D
Precision Fahrenheit Temperature Sensors
General Description
The LM34 series are precision integrated-circuit tempera-
ture sensors, whose output voltage is linearly proportional to
the Fahrenheit temperature. The LM34 thus has an advan-
tage over linear temperature sensors calibrated in degrees
Kelvin, as the user is not required to subtract a large con-
stant voltage from its output to obtain convenient Fahren-
heit scaling. The LM34 does not require any external cali-
bration or trimming to provide typical accuracies of g(/2§Fat
room temperature and g1(/2§F over a full b50 to a300§F
temperature range. Low cost is assured by trimming and
calibration at the wafer level. The LM34’s low output imped-
ance, linear output, and precise inherent calibration make
interfacing to readout or control circuitry especially easy. It
can be used with single power supplies or with plus and
minus supplies. As it draws only 75 mA from its supply, it has
very low self-heating, less than 0.2§F in still air. The LM34 is
rated to operate over a b50§ to a300§F temperature
range, while the LM34C is rated for a b40§ to a230§F
range (0§F with improved accuracy). The LM34 series is
available packaged in hermetic TO-46 transistor packages,
while the LM34C, LM34CA and LM34D are also available in
the plastic TO-92 transistor package. The LM34D is also
available in an 8-lead surface mount small outline package.
The LM34 is a complement to the LM35 (Centigrade) tem-
perature sensor.
Features
Y
Calibrated directly in degrees Fahrenheit
Y
Linear a10.0 mV/§F scale factor
Y
1.0§F accuracy guaranteed (at a77§F)
Y
Rated for full b50§ to a300§F range
Y
Suitable for remote applications
Y
Low cost due to wafer-level trimming
Y
Operates from 5 to 30 volts
Y
Less than 90 mA current drain
Y
Low self-heating, 0.18§F in still air
Y
Nonlinearity only g0.5§F typical
Y
Low-impedance output, 0.4X for 1 mA load
Connection Diagrams
TO-46
Metal Can Package*
TL/H/6685–1
*Case is connected to negative pin (GND).
Order Numbers LM34H, LM34AH,
LM34CH, LM34CAH or LM34DH
See NS Package Number H03H
TO-92
Plastic Package
TL/H/6685–2
Order Number LM34CZ,
LM34CAZ or LM34DZ
See NS Package Number Z03A
SO-8
Small Outline Molded Package
TL/H/6685–20
Top View
N.C. e No Connection
Order Number LM34DM
See NS Package Number M08A
Typical Applications
TL/H/6685–3
FIGURE 1. Basic Fahrenheit Temperature Sensor
(a5§ to a300§F)
TL/H/6685–4
FIGURE 2. Full-Range Fahrenheit Temperature Sensor
TRI-STATE is a registered trademark of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation RRD-B30M75/Printed in U. S. A.

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