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ADXL50JH Arkusz danych(PDF) 16 Page - Analog Devices |
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ADXL50JH Arkusz danych(HTML) 16 Page - Analog Devices |
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16 / 16 page  ADXL50 –16– REV. B +15 –45 +105 –30 –40 –35 –35 –55 –15 –25 –20 –10 –5 0 +10 +5 +85 +65 +45 +25 +5 –15 HIGH TEMP TRIM LOW TEMP TRIM COMPENSATED XL50 UNCOMPENSATED XL50 TEMPERATURE – °C Figure 30. ADXL50 0 g Drift With and Without the Com- pensation Circuit of Figure 29 ADXL50 Application Literature Available Contact the Analog Devices Literature Center for a copy of publication number G2112, the Accelerometer Application Guide. This includes all current application notes and data sheets for Analog Devices’ accelerometers. OUTLINE DIMENSIONS Dimensions shown in inches and (mm). 0.160 (4.06) 0.110 (2.79) 0.034 (0.86) 0.027 (0.69) 0.045 (1.14) 0.027 (0.69) 0.115 (2.92) BSC 6 8 5 7 1 4 2 3 9 10 0.230 (5.84) BSC REFERENCE PLANE SEATING PLANE 0.335 (8.51) 0.305 (7.75) 0.370 (9.40) 0.335 (8.51) 0.750 (19.05) 0.500 (12.70) 0.045 (1.14) 0.010 (0.25) 0.040 (1.02) MAX 0.185 (4.70) 0.165 (4.19) Compensating for the 0 g Drift of the ADXL50 Accelerometer The circuit of Figure 29 provides a linear temperature compen- sation for the ADXL50. Figure 30 shows the 0 g drift over tem- perature for a typical ADXL50 with and without this circuit. As shown by Figure 30, the linear portion of the drift curve has been subtracted out. In effect, the curve has been rotated coun- terclockwise until it is horizontal, leaving just the bow of the curve: that portion which is not linear. As shown by Figure 30, over a +25 °C to +70°C range, a 10× reduction in drift is achieved. The circuit of Figure 29 is essentially a temperature sensor coupled to a Whetstone bridge. The AD590 provides a 1 µA/°K current output whose voltage scale factor is set by resistor RA. The bridge circuit subtracts out the nominal 298 mV output of the AD590 at +25 °C and leaves only the change in temperature, which is what is needed. Without the bridge, the 298 mV room temperature “offset” would “swamp” the much smaller change in output with temperature. Resistors R5 and R6 form a resistor divider (one half of the bridge) which divides down the +3.4 V reference output of the ADXL50 to 0.3 V which appears at the noninverting input of the AD820 op amp. Resistors R7 and R8 form the other half of the bridge, and because they have the same ratio as R5 and R6, the op amp will have a +3.4 V output at room temperature. BUFFER AMP ADXL50 PRE-AMP 0.022 µF C1 C1 0.022 µF C2 COM 0.1 µF C3 +5V V OUT V IN– V PR +3.4V REF R1 R3 1.8V 310k Ω R7 +5V 7 2 3 6 4 0.01 µF AD820 10 8 5 3 2 4 9 1 6 499k Ω TEMPERATURE COMPENSATED ACCELERATION OUTPUT 49.9k Ω 3101k Ω R5 RB TC COMP SET 10k Ω R4 500 Ω BRIDGE BALANCE RA 1k Ω AD590 +5V 1 µA/°K TEMPCO AMPLIFIER R9 20k Ω RC 20k Ω 49.9k Ω R2 R10 25k Ω 0g OUTPUT LEVEL CALIBRATION PROCEEDURE: AT T MIN OR LOWER TEMP CAL POINT... 1. SET RB ALL THE WAY TO ONE SIDE. 2. ADJUST RA FOR +3.4V AT TEST POINT "A." 3. SET RC FOR +2.5V V OUT (AT PIN 9 OF ADXL50). 4. TEMPORARILY CONNECT A 1.5k Ω RESISTOR BETWEEN THE CENTER OF RB AND GROUND. 5. ADJUST RB FOR +2.5V AT V OUT . 6. REMOVE THE 1.5k Ω RESISTOR. V OUT SHOULD NOT CHANGE. 7. GO TO T MAX OR HIGH TEMP CAL POINT. 8. READJUST RB FOR +2.5V. 9. CALIBRATION COMPLETE. TEST POINT "A" 30k R8 30k R6 Figure 29. ADXL50 0 g Drift Compensation Circuit |
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