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LM134H-6 データシート(PDF) 7 Page - Linear Technology

部品番号 LM134H-6
部品情報  Constant Current Source and Temperature Sensor
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メーカー  LINER [Linear Technology]
ホームページ  http://www.linear.com
Logo LINER - Linear Technology

LM134H-6 データシート(HTML) 7 Page - Linear Technology

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LM134 Series
7
Figure 3. Centigrade Temperature Sensor
V+
V
R
RSET
226
VS ≥ 4V
LM134-3
134 F03
OUTPUT
10mV/
°C
9.53k
1%
1k
SLOPE
ADJ
10k
ZERO
ADJ
100
10k
“a”
–15V
LT1009
The two trims shown in Figure 3 are still intended to be a
“one point” temperature calibration, where the zero and
the slope are trimmed at a single temperature. The LT1009
reference is adjusted to give 2.700V at node “a” at TSENSOR
= 25
°C. The 1k trimmer then adjusts the output for 0.25V,
completing the calibration. If the calibration is to be done
at a temperature other than 25
°C , trim the LT1009 for
2.7025—(1
µA)[TSENSOR (°C)](100Ω) at node “a”, then
adjust the 1k trimmer for proper output.
If higher accuracy is required, a two point calibration
technique can be used. In Figure 4, separate zero and slope
trims are provided. Residual nonlinearity is now the limi-
tation on accuracy. Nonlinearity of the LM134 in a 100
°C
span is typically less than 0.5
°C. This particular method of
trimming has the advantage that the slope trim does not
interact with the zero trim. Trim procedure is to adjust for
zero output with TSENSOR = 0°C, then trim slope for proper
output at some convenient second temperature. No fur-
ther trimming is required.
226
Ω*
V+
≥ 5V
V+
V
R
LM134-3
134 F04
OUTPUT
10mV/
°C
332k
1%
11k*
1%
SLOPE
TRIM
500k
ZERO
TRIM
10k
15k
50k
–15V
LT1009
*LOW TC, STABLE RESISTOR
Figure 4. Centigrade Temperature Sensor with 2 Point Trim
APPLICATIO S I FOR ATIO
TYPICAL APPLICATIO S
V+
V
R
LM334
VIN ≥ 4.8V
R1
230
1%
R2
10k
1%
C1
0.1
µF
R3*
600
VOUT = 10mV/°K
ZOUT ≤ 100Ω
134 TA03
*OUTPUT IMPEDANCE OF THE LM134 AT THE “R” PIN IS
APPROXIMATELY
Ω, WHERE RO IS THE EQUIVALENT
EXTERNAL RESISTANCE CONNECTED TO THE VPIN. THIS
NEGATIVE RESISTANCE CAN BE REDUCED BY A FACTOR OF
5 OR MORE BY INSERTING AN EQUIVALENT RESISTOR IN
SERIES WITH THE OUTPUT.
–RO
16
134 TA04
V+
V
R
LM334
VIN
–VIN
RSET
I+
R1*
≈10 RSET
D1
1N457
*SELECT RATIO OF R1 TO RSET TO
OBTAIN ZERO DRIFT. I+
≈2 ISET.
V
V+
R
LM334
RSET
ISET
134 TA02
VIN
–VIN
Basic 2-Terminal
Current Source
Low Output Impedance
Thermometer (Kelvin Output)
Zero Temperature
Coefficient Current Source


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