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LM26CIM5-ZHA Datasheet(PDF) 8 Page - Texas Instruments |
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LM26CIM5-ZHA Datasheet(HTML) 8 Page - Texas Instruments |
8 / 24 page 6 TEMP 6 1.8015 V T 1525.04 2.4182 10 3.479 10- - = - + ´ + ´ 6 2 2 O V = ( 3.47 10 (T 30) ) + (1.082 10 (T 30)) + 1.8015 V - - - ´ ´ - ´ ´ - VTEMP GND HYST REF TEMP SENSOR + - V+ V + LM26__D US HYST LM26 SNIS115S – MAY 2001 – REVISED SEPTEMBER 2015 www.ti.com Functional Block Diagrams (continued) Figure 5. LM26-_ _D Output Pin Block Diagram 8.3 Feature Description 8.3.1 Hysteresis The HYST pin level sets the comparator hysteresis. Setting the HYST pin to GND selects 10°C hysteresis, while setting it to V+ selects 2°C. A series resistor can be used for protection purposes. The input leakage current of the pin is less than 10 µA. The value of the resistor will depend on the value of V+ as well as the leakage current. For example with V+ = 3.3 V the input threshold level for VIH = 0.8 × 3.3 V = 2.64 V, thus the voltage drop across the resistor should be less than 0.66 V. The 10-µA input leakage current requires the resistor value to be less than 66 k Ω. 8.3.2 VTEMP Output The VTEMP output provides an output voltage that can be used to determine the temperature reading of the LM26. The temperature reading of the LM26 can be calculated using the equation: (1) or (2) The VTEMP output has very weak drive capability (1-µA source, 40-µA sink). So care should be taken when attaching circuitry to this pin. Capacitive loading may cause the VTEMP output to oscillate. Simply adding a resistor in series as shown in Figure 6 and Figure 7 will prevent oscillations from occurring. To determine the value of the resistor follow the guidelines given in Table 1. The same value resistor will work for either placement of the resistor. If an additional capacitive load is placed directly on the LM26 output, rather than across CLOAD, it should be at least a factor of 10 smaller than CLOAD. Table 1. Resistive Compensation for Capacitive Loading of VTEMP CLOAD R ( Ω) ≤100pF 0 1nF 8200 10nF 3000 100nF 1000 ≥1µF 430 8 Submit Documentation Feedback Copyright © 2001–2015, Texas Instruments Incorporated Product Folder Links: LM26 |
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