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AD22151 数据表(PDF) 4 Page - Analog Devices |
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AD22151 数据表(HTML) 4 Page - Analog Devices |
4 / 8 page REV. A –4– AD22151 FIELD – Gauss –600 400 –400 –200 0 200 0 0.005 0.010 0.015 0.020 0.025 600 Figure 5. Signal Drift over Temperature (–40 ∞C to +150 ∞C) vs. Field (–200 ppm); 5 V Supply TEMPERATURE – C 0.25 0.20 0 0.15 0.05 0.10 –40 10 60 110 160 –0.05 Figure 6. Gain Variation from 25 ∞C vs. Temperature (–200 ppm) Field; R1 –15 k W FIELD – Gauss –600 400 –400 –200 0 200 0 0.010 0.015 0.020 0.025 600 0.005 0.045 0.040 0.030 0.035 –800 800 Figure 7. Signal Drift over Temperature (–40 ∞C to +150 ∞C) vs. Field (–2000 ppm); 5 V Supply TEMPERATURE – C 2.0 1.8 1.0 1.6 1.2 1.4 –40 10 60 110 160 –0.2 0.8 0.6 0.4 0.2 0 Figure 8. Gain Variation (from 25 ∞C) vs. Temperature (–2000 ppm Field; R1 = 12 k W) TEMPERATURE COMPENSATION The AD22151 incorporates a “thermistor” transducer that detects relative chip temperature within the package. This function provides a compensation mechanism for the various temperature dependencies of the Hall cell and magnet combina- tions. The temperature information is accessible at Pins 1 and 2 ( +2900 ppm/ ∞C) and Pin 3 ( –2900 ppm/∞C), as repre- sented by Figure 9. The compensation voltages are trimmed to converge at VCC/2 at 25 ∞C. Pin 3 is internally connected to the negative TC voltage via an internal resistor (see the Func- tional Block Diagram). An external resistor connected between Pin 3 and Pins 1 or 2 will produce a potential division of the two complementary TC voltages to provide optimal compensa- tion. The Pin 3 internal resistor provides a secondary TC designed to reduce second order Hall cell temperature sensitivity. TEMPERATURE – C 1.0 0.8 0 0.6 0.2 0.4 150 112 74 –2 –40 –0.2 –0.4 –0.6 –0.8 –1.0 36 TC1, TC2 VOLTS TC3 VOLTS Figure 9. TC1, TC2, and TC3 with Respect to Reference vs. Temperature The voltages present at Pins 1, 2, and 3 are proportional to the supply voltage. The presence of the Pin 2 internal resistor dis- tinguishes the effective compensation ranges of Pins 1 and 2. (See temperature configuration in Figures 1 and 2, and typical resistor values in Figures 10 and 11.) Variation occurs in the operation of the gain temperature com- pensation for two reasons. First, the die temperature within the package is somewhat higher than the ambient temperature due |
类似零件编号 - AD22151 |
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类似说明 - AD22151 |
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