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LM334SM 数据表(PDF) 8 Page - National Semiconductor (TI) |
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LM334SM 数据表(HTML) 8 Page - National Semiconductor (TI) |
8 / 14 page 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 Ω 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/583µA. 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 www.national.com 8 |
类似零件编号 - LM334SM |
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类似说明 - LM334SM |
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