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参数资料
| 型号： | LM334Z#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/12页 |
| 文件大小： | 160K |
| 描述： | IC CURRENT SOURCE TO92-3 |
| 标准包装： | 100 |
| 功能： | 电流源 |
| 输入电压： | 0.8 V ~ 40 V |
| 电流 - 输出： | 10mA |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-226-3、TO-92-3（TO-226AA）成形引线 |
| 供应商设备封装： | TO-92-3 |
| 包装： | 散装 |
LM134 Series
7
Figure 3. Centigrade Temperature Sensor
V
+
V
R
R
SET
226&
V
S
e 4V
LM134-3
134 F03
OUTPUT
10mV/癈
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 T
SENSOR
= 25癈. 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癈 , trim the LT1009 for
2.7025(1礎)[T
SENSOR
(癈)](100&) 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癈
span is typically less than 0.5癈. 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 T
SENSOR
= 0癈, then trim slope for proper
output at some convenient second temperature. No fur-
ther trimming is required.
226&*
V
+
e 5V
V
+
V
R
LM134-3
134 F04
OUTPUT
10mV/癈
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
U
U
U
TYPICAL APPLICATIO S
V
+
V
R
LM334
V
IN
e 4.8V
R1
230&
1%
R2
10k
1%
C1
0.1礔
R3*
600&
V
OUT
= 10mV/癒
Z
OUT
d 100&
134 TA03
*OUTPUT IMPEDANCE OF THE LM134 AT THE R PIN IS
APPROXIMATELY &, WHERE R
O
IS THE EQUIVALENT
EXTERNAL RESISTANCE CONNECTED TO THE V
PIN. THIS
NEGATIVE RESISTANCE CAN BE REDUCED BY A FACTOR OF
5 OR MORE BY INSERTING AN EQUIVALENT RESISTOR IN
SERIES WITH THE OUTPUT.
R
O
16
134 TA04
V
+
V
R
LM334
V
IN
V
IN
R
SET
I
+
R1*
H10 R
SET
D1
1N457
*SELECT RATIO OF R1 TO R
SET
TO
OBTAIN ZERO DRIFT. I
+
H2 I
SET
.
V
V
+
R
LM334
R
SET
I
SET
134 TA02
V
IN
V
IN
Basic 2-Terminal
Current Source
Low Output Impedance
Thermometer (Kelvin Output)
Zero Temperature
Coefficient Current Source
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相关代理商/技术参数 |
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