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参数资料
| 型号： | LM234H/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 模拟信号调理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, MBCY3 |
| 封装： | METAL CAN, TO-46, 3 PIN |
| 文件页数： | 13/14页 |
| 文件大小： | 759K |
| 代理商： | LM234H/NOPB |
Application Hints (Continued)
If the forward voltage drop of the diode was 0.65V instead of
the estimate of 0.6V (an error of 8%), the actual set current
will be
an error of less than 5%.
If the estimate for the tempco of the diode’s forward voltage
drop was off, the tempco cancellation is still reasonably
effective. Assume the tempco of the diode is 2.6mV/C in-
stead of 2.5mV/C (an error of 4%). The tempco of the circuit
is now:
A 1mA LM134 current source with no temperature compen-
sation would have a set resistor of 68
and a resulting
tempco of
So even if the diode’s tempco varies as much as ±4% from
its estimated value, the circuit still eliminates 98% of the
LM134’s inherent tempco.
Typical Applications
Ground Referred Fahrenheit Thermometer
00569715
*Select R3 = VREF/583A. VREF may be any stable positive voltage ≥ 2V
Trim R3 to calibrate
Terminating Remote Sensor for Voltage Output
00569714
Low Output Impedance Thermometer
00569706
*Output impedance of the LM134 at the “R” pin is approximately
where R2 is the equivalent external resistance connected from the V
pin
to ground. This negative resistance can be reduced by a factor of 5 or
more by inserting an equivalent resistor R3 =(R2/16) in series with the
output.
Low Output Impedance Thermometer
00569716
LM134/LM234/LM334
www.national.com
8
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相关代理商/技术参数 |
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|---|---|
| LM234S8 | 制造商:Linear Technology 功能描述: |
| LM234Z | 功能描述:基准电压& 基准电流 3-Term Adjust Currnt RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM234Z | 制造商:STMicroelectronics 功能描述:IC - Adjustable Current Source |
| LM234Z-3 | 功能描述:基准电压& 基准电流 RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| LM234Z-3/NOPB | 功能描述:基准电压& 基准电流 3-TERM ADJ CURRENT SOURCE RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
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