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参数资料
| 型号： | LM185-1.2MW8 |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.235 V, UUC |
| 封装： | WAFER |
| 文件页数： | 13/16页 |
| 文件大小： | 375K |
| 代理商： | LM185-1.2MW8 |
Typical Applications (Continued)
METER THERMOMETERS
0C100C Thermometer
DS005518-28
Calibration
1. Short LM385-1.2, adjust R3 for IOUT= temp at 1 A/K
2. Remove short, adjust R2 for correct reading in centigrade
IQ at 1.3V500 A
IQ at 1.6V2.4 mA
Lower Power Thermometer
DS005518-29
*2N3638 or 2N2907 select for inverse HFE 5
Select for operation at 1.3V
IQ 600 A to 900 A
0F50F Thermometer
DS005518-30
Calibration
1. Short LM385-1.2, adjust R3 for IOUT= temp at 1.8 A/K
2. Remove short, adjust R2 for correct reading in F
Micropower Thermocouple Cold Junction
Compensator
DS005518-31
Adjustment Procedure
1. Adjust TC ADJ pot until voltage across R1 equals Kelvin temperature
multiplied by the thermocouple Seebeck coefficient.
2. Adjust zero ADJ pot until voltage across R2 equals the thermocouple
Seebeck coefficient multiplied by 273.2.
Thermocouple
Seebeck
R1
R2
Voltage
Type
Coefficient
(
)()
Across R1
Across R2
(V/C)
@ 25C
(mV)
J
52.3
523 1.24k
15.60
14.32
T
42.8
432
1k
12.77
11.78
K
40.8
412 953
12.17
11.17
S
6.4
63.4 150
1.908
1.766
Typical supply current 50 A
LM185-1.2/LM285-1.2/LM385-1.2
www.national.com
6
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