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ADXL50AH Scheda tecnica(PDF) 9 Page - Analog Devices |
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ADXL50AH Scheda tecnica(HTML) 9 Page - Analog Devices |
9 / 16 page ADXL50 REV. B –9– The sensor’s tight mechanical spacing allows it to be electro- statically deflected to full scale while operating on a 5 volt sup- ply. A self-test is initiated by applying a TTL “high” level voltage (>+2.0 V) to the ADXL50’s self-test pin which causes the chip to apply a deflection voltage to the beam which moves it an amount equal to –50 g (the negative full-scale output of the device). Note that the ±10% tolerance of the self-test circuit is not proportional to the sensitivity error, see Self-Test section. The output of the ADXL50’s preamplifier is 1.8 V at 0 g accel- eration with an output range of ±0.95 V for a ±50 g input, i.e., 19 mV/g. An uncommitted buffer amplifier has been included on-chip to enhance the user’s ability to offset the 0 g signal level and to amplify and filter the signal. Access is provided to both the inverting input and the output of this amplifier via pins VOUT and VIN–, while the noninverting input is connected inter- nally to a +1.8 V reference. The +1.8 V is derived from a resistor divider connected to the 3.4 V reference. BASIC CONNECTIONS FOR THE ADXL50 Figure 19 shows the basic connections needed for the ADXL50 to measure accelerations in the ±50 g range with an output scale factor 40 mV/g corresponding to a 2.5 V 0 g level, a ±2.0 V full- scale swing around 0 g and a 3 dB bandwidth of approximately 1 kHz. In general, the designer will need to take into account the initial zero g bias when designing circuits. For the ADXL50J this off- set is 1.8 V ± 250 mV. When microprocessors and software Figure 18. Functional Block Diagram +1.8V CS1 BEAM CS2 SYNCHRONOUS DEMODULATOR 180 ° 0 ° EXTERNAL DEMODULATION CAPACITOR C1 C1 33k Ω 33k Ω +5V +1.8V LOOP GAIN = 10 RST 3M Ω +0.2V SYNC COMMON V PR INTERNAL FEEDBACK LOOP 1MHz OSCILLATOR 75 Ω +3.4V +3.4V EXTERNAL OSCILLATOR DECOUPLING CAPACITOR C2 +5V +5V INTERNAL REFERENCE +3.4V +1.8V +0.2V +3.4V V REF COM +5V BUFFER AMPLIFIER +1.8V V IN– V OUT 50k Ω SELF–TEST (ST) +3.4V PREAMP DENOTES EXTERNAL PIN CONNECTION Figure 19. ADXL50 Application Providing an Output Sensitivity of 40 mV/g, a +2.5 V 0 g Level and a Bandwidth of 1 kHz V REF OUTPUT R2 274k Ω V OUT DEMODULATOR REFERENCE SENSOR +1.8V BUFFER AMP PREAMP OSCILLATOR ADXL50 C2 0.022 µF OSCILLATOR DECOUPLING CAPACITOR SELF TEST (ST) C3 +5V 0.022 µF DEMODULATOR CAPACITOR C1 C1 COM R1 49.9k Ω V PR V IN– R3 105k Ω +3.4V 4 7 5 1 2 3 8 10 9 6 |
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