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LM134H-6 データシート(PDF) 7 Page - Linear Technology |
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LM134H-6 データシート(HTML) 7 Page - Linear Technology |
7 / 12 page LM134 Series 7 Figure 3. Centigrade Temperature Sensor V+ V– R RSET 226 Ω VS ≥ 4V LM134-3 134 F03 OUTPUT 10mV/ °C 9.53k 1% 1k SLOPE ADJ 10k ZERO ADJ 100 Ω 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 Ω 1% R2 10k 1% C1 0.1 µF R3* 600 Ω 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 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. –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 |
同様の部品番号 - LM134H-6 |
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同様の説明 - LM134H-6 |
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