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參數(shù)資料
| 型號(hào)： | LM19 |
| 文件頁(yè)數(shù)： | 1/8頁(yè) |
| 文件大小： | 164K |
| 代理商： | LM19 |
LM19
2.4V, 10μA, TO-92 Temperature Sensor
General Description
The
LM19
is
a
precision
analog
integrated-circuit temperature sensor that operates over a
55C to +130C temperature range. The power supply op-
erating range is +2.4 V to +5.5 V. The transfer function of
LM19 is predominately linear, yet has a slight predictable
parabolic curvature. The accuracy of the LM19 when speci-
fied to a parabolic transfer function is
±
2.5C at an ambient
temperature of +30C. The temperature error increases lin-
early and reaches a maximum of
±
3.8C at the temperature
range extremes. The temperature range is affected by the
power supply voltage. At a power supply voltage of 2.7 V to
5.5 V the temperature range extremes are +130C and
55C. Decreasing the power supply voltage to 2.4 V
changes the negative extreme to 30C, while the positive
remains at +130C.
The LM19’s quiescent current is less than 10 μA. Therefore,
self-heating is less than 0.02C in still air. Shutdown capa-
bility for the LM19 is intrinsic because its inherent low power
consumption allows it to be powered directly from the output
of many logic gates or does not necessitate shutdown at all.
output
CMOS
Applications
n
Cellular Phones
n
Computers
n
Power Supply Modules
n
Battery Management
n
FAX Machines
n
Printers
n
HVAC
n
Disk Drives
n
Appliances
Features
n
Rated for full 55C to +130C range
n
Available in a TO-92 package
n
Predictable curvature error
n
Suitable for remote applications
Key Specifications
j
Accuracy at +30C
j
Accuracy at +130C & 55C
j
Power Supply Voltage Range
j
Current Drain
j
Nonlinearity
j
Output Impedance
j
Load Regulation
0 μA
<
I
L
<
+16 μA
±
2.5 C (max)
±
3.5 to
±
3.8 C (max)
+2.4V to +5.5V
10 μA (max)
±
0.4 % (typ)
160
(max)
2.5 mV (max)
Typical Application
Output Voltage vs Temperature
20004002
V
O
= (3.88x10
6
xT
2
) + (1.15x10
2
xT) + 1.8639
or
where:
T is temperature, and V
O
is the measured output voltage of the LM19.
20004024
FIGURE 1. Full-Range Celsius (Centigrade) Temperature Sensor (55C to +130C)
Operating from a Single Li-Ion Battery Cell
May 2001
L
2001 National Semiconductor Corporation
DS200040
www.national.com
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