PDF ADXL250AQC Data sheet ( Hoja de datos )

Número de pieza	ADXL250AQC
Descripción	+-5 g to +-50 g/ Low Noise/ Low Power/ Single/Dual Axis iMEMS Accelerometers
Fabricantes	Analog Devices
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No Preview Available ! a ؎5 g to ؎50 g, Low Noise, Low Power, Single/Dual Axis iMEMS® Accelerometers ADXL150/ADXL250 FEATURES Complete Acceleration Measurement System on a Single Monolithic IC 80 dB Dynamic Range Pin Programmable ؎50 g or ؎25 g Full Scale Low Noise: 1 mg/√Hz Typical Low Power: <2 mA per Axis Supply Voltages as Low as 4 V 2-Pole Filter On-Chip Ratiometric Operation Complete Mechanical & Electrical Self-Test Dual & Single Axis Versions Available Surface Mount Package +VS 0.1␮F FUNCTIONAL BLOCK DIAGRAMS TP (DO NOT CONNECT) ADXL150 GAIN AMP SENSOR CLOCK +VS 2 DEMODULATOR 25k⍀ 5k⍀ BUFFER AMP 9 SELF-TEST COM OFFSET NULL TP (DO NOT CONNECT) X OFFSET NULL VOUT GENERAL DESCRIPTION The ADXL150 and ADXL250 are third generation ± 50 g sur- face micromachined accelerometers. These improved replace- ments for the ADXL50 offer lower noise, wider dynamic range, reduced power consumption and improved zero g bias drift. The ADXL150 is a single axis product; the ADXL250 is a fully integrated dual axis accelerometer with signal conditioning on a single monolithic IC, the first of its kind available on the com- mercial market. The two sensitive axes of the ADXL250 are orthogonal (90°) to each other. Both devices have their sensitive axes in the same plane as the silicon chip. The ADXL150/ADXL250 offer lower noise and improved signal-to-noise ratio over the ADXL50. Typical S/N is 80 dB, allowing resolution of signals as low as 10 mg, yet still providing a ± 50 g full-scale range. Device scale factor can be increased from 38 mV/g to 76 mV/g by connecting a jumper between VOUT and the offset null pin. Zero g drift has been reduced to 0.4 g over the industrial temperature range, a 10× improvement over the ADXL50. Power consumption is a modest 1.8 mA per axis. The scale factor and zero g output level are both +VS 0.1␮F ADXL250 GAIN AMP SENSOR 25k⍀ DEMODULATOR 5k⍀ SENSOR CLOCK GAIN AMP 5k⍀ DEMODULATOR 25k⍀ BUFFER AMP VOUTX +VS 2 BUFFER AMP VOUTY SELF-TEST COM Y OFFSET NULL ratiometric to the power supply, eliminating the need for a volt- age reference when driving ratiometric A/D converters such as those found in most microprocessors. A power supply bypass capacitor is the only external component needed for normal operation. The ADXL150/ADXL250 are available in a hermetic 14-lead surface mount cerpac package specified over the 0°C to +70°C commercial and –40°C to +85°C industrial temperature ranges. Contact factory for availability of devices specified over automo- tive and military temperature ranges. iMEMS is a registered trademark of Analog Devices, Inc. REV. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998 1 page ADXL150/ADXL250 Typical Characteristics (@+5 V dc, +25؇C with a 38 mV/g Scale Factor unless otherwise noted) 6 5.0 4.0 0 3.0 –6 2.0 –12 PACKAGE RESONANCE 1.0 –18 0 –1.0 –2.0 –3.0 –4.0 –5.0 4.0 4.5 5.0 5.5 POWER SUPPLY VOLTAGE 6.0 –24 –30 –36 –42 –48 100 BEAM RESONANCE 1k FREQUENCY – Hz 10k Figure 3. Typical Sensitivity Error from Ideal Ratiometric Response for a Number of Units Figure 6. Typical Output Response vs. Frequency of ADXL150/ADXL250 on a PC Board that Has Been Conformally Coated 2.5 2.0 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 –2.0 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE Figure 4. Offset Error of Zero g Level from Ideal VS /2 Response as a Percent of Full-Scale for a Number of Units 30 20 10 0 –10 –20 –30 –40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90 100 TEMPERATURE – ؇C Figure 7. Typical Zero g Drift for a Number of Units 2.4 2.2 +105؇C 2 +25؇C 1.8 –40؇C 1.6 1.4 1.2 4 4.5 5 5.5 SUPPLY VOLTAGE – Volts 6 Figure 5. Typical Supply Current vs. Supply Voltage 600g 60g 500g 400g 500g INPUT 50g 40g 300g 200g OUTPUT RESPONSE 30g 20g 100g 10g 0g 0g TIME – 0.2ms/Div Figure 8. Typical 500 g Step Recovery at the Output REV. 0 –5– 5 Page ADXL150/ADXL250 for various full-scale g levels and approximate circuit band- widths. For bandwidths other than those listed, use the formula: 1 ( )Cf = 2π R3 Desired 3dB Bandwidth in Hz or simply scale the value of capacitor Cf accordingly; i.e., for an application with a 50 Hz bandwidth, the value of Cf will need to be twice as large as its 100 Hz value. If further noise reduc- tion is needed while maintaining the maximum possible band- width, a 2- or 3-pole post filter is recommended. These provide a much steeper roll-off of noise above the pole frequency. Fig- ure 21 shows a circuit that provides 2-pole post filtering. Com- ponent values for the 2-pole filter were selected to operate the first op amp at unity gain. Capacitors C3 and C4 were chosen to provide 3 dB bandwidths of 10 Hz, 30 Hz, 100 Hz and 300 Hz. The second op amp offsets and scales the output to provide a +2.5 V ± 2 V output over a wide range of full-scale g levels. APPLICATION HINTS ADXL250 Power Supply Pins When wiring the ADXL250, be sure to connect BOTH power supply terminals, Pins 14 and 13. Ratiometric Operation Ratiometric operation means that the circuit uses the power supply as its voltage reference. If the supply voltage varies, the accelerometer and the other circuit components (such as an ADC, etc.) track each other and compensate for the change. Figure 22 shows how both the zero g offset and output sensitiv- ity of the ADXL150/ADXL250 vary with changes in supply voltage. If they are to be used with nonratiometric devices, such as an ADC with a built-in 5 V reference, then both components should be referenced to the same source, in this case the ADC reference. Alternatively, the circuit can be powered from an external +5 volt reference. 2.65 40.25 2.60 39.50 2.55 38.75 2.50 38.00 2.45 37.25 2.40 36.50 2.35 35.75 5.25 5.20 5.15 5.10 5.05 5.00 4.95 4.90 4.85 4.80 4.75 POWER SUPPLY VOLTAGE Figure 22. Typical Ratiometric Operation Since any voltage variation is transferred to the accelerometer’s output, it is important to reduce any power supply noise. Simply following good engineering practice of bypassing the power supply right at Pin 14 of the ADXL150/ADXL250 with a 0.1 µF ca- pacitor should be sufficient. TP (DO NOT CONNECT) R3 82.5k⍀ 5 +VS C1 0.1␮F 14 ADXL150 GAIN AMP SENSOR TYPICAL FILTER VALUES BW C3 C4 CLOCK +VS 2 DEMODULATOR 25k⍀ 5k⍀ R1 R2 82.5k⍀ 42.2k⍀ 10 BUFFER AMP C3 C4 +VS 0.1␮F 28 1/2 OP296 1 3 2-POLE 300Hz 0.027␮F 0.0033␮F 100Hz 0.082␮F 0.01␮F 9 SELF-TEST 7 COM OFFSET NULL 8 +VS 2 FILTER +VS 2 30Hz 0.27␮F 0.033␮F C2 10Hz 0.82␮F 0.1␮F 0.1␮F SCALING AMPLIFIER 5 DESIRED F.S. OUTPUT RANGE SCALE FACTOR EXT R5 AMP GAIN VALUE OUTPUT 1/2 7 OP296 46 R4 100k⍀ 76mV/g 100mV/g 200mV/g 400mV/g ±25g ±20g ±10g ±5g 2.0 2.6 5.3 10.5 200k⍀ 261k⍀ 536k⍀ 1M⍀ R6 +VS R5 1M⍀ 200k⍀ 0g TRIM Figure 21. Two-Pole Post Filter Circuit REV. 0 –11– 11 Page

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