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ADXRS401ABG 数据表(PDF) 9 Page - Analog Devices |
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ADXRS401ABG 数据表(HTML) 9 Page - Analog Devices |
9 / 12 page ADXRS401 Rev. 0 | Page 9 of 12 SETTING BANDWIDTH External capacitors CMID and COUT are used in combination with on-chip resistors to create two low-pass filters to limit the bandwidth of the ADXRS401’s rate response. The –3 dB frequency set by ROUT and COUT is: ( ) OUT OUT OUT C R π 2 1/ f × × × = This frequency can be well controlled since ROUT has been trimmed during manufacturing to be 180 kΩ ±1%. Any external resistor applied between the RATEOUT (1B, 2A) and SUMJ (1C, 2C) pins will result in: () ( EXT EXT OUT R kΩ 180 / R kΩ 180 R + × = ) The −3 dB frequency is set by RSEN (the parallel combination of RSEN1 and RSEN2) at about 4.5 kΩ nominal. CMID is less well controlled, because RSEN1 and RSEN2 have been used to trim the rate sensitivity during manufacturing and have a ±35% tolerance. Its primary purpose is to limit the high frequency demodulation artifacts from saturating the final amplifier stage. Thus, this pole of nominally 400 Hz @ 0.1 µF need not be precise. Lower frequency is preferable, but its variability usually requires it to be about 10 times greater (in order to preserve phase integrity) than the well-controlled output pole. In general, both −3 dB filter frequencies should be set as low as possible to reduce the amplitude of these high frequency artifacts, as well as to reduce the overall system noise. INCREASING MEASUREMENT RANGE To increase the full-scale measurement range of the ADXRS401, place an external resistor between the RATEOUT (1B, 2A) and SUMJ (1C, 2C) pins. This parallels the internal ROUT resistor that is factory-trimmed to 180 kΩ. For example, a 330 kΩ external resistor gives approximately 10mV/°/sec sensitivity and a commensurate ∼50% increase in the full-scale range. This is effective for up to a 4× increase in the full-scale range. (The minimum value of the parallel resistor allowed is 45 kΩ.) Beyond this amount of external sensitivity reduction, the internal circuitry headroom requirements prevent further increase in the linear full-scale output range. The drawbacks of modifying the full-scale range are the additional output null drift (as much as 2°/sec over temperature) and the readjustment of the initial null bias. See Null Adjust section and Application Note AN-625 for details. TEMPERATURE OUTPUT AND CALIBRATION It is common practice to temperature-calibrate gyros to improve their overall accuracy. The ADXRS401 has a temperature-proportional voltage output that provides input to such a calibration method. The voltage at TEMP (3F, 3G) is nominally 2.5 V at 27°C and has a PTAT (proportional to absolute temperature) characteristic of 8.4 mV/°C. Note that the TEMP output circuitry is limited to 50 µA source current. Limiting the bandwidth of the device reduces the flat-band noise during the calibration process, improving the measurement accuracy at each calibration point. 5G 4G 3A 5V 2G 1F 7F 6A 7D 7C 7B 1C 4A 5A 7E 6G 1D 2A 1E 3G 1B PDD 12V + ADXRS401 1 µF 22nF 100nF 22nF CP2 CP1 PGND CP4 CP3 CP5 CHARGE PUMP/REG. TEMP PTAT RATE- OUT 2.5V π DEMOD RATE SENSOR SELF TEST 100nF 100nF CMID AGND AVCC ST1 ST2 CORIOLIS SIGNAL CHANNEL SSEN2 RSEN1 COUT ROUT 180k Ω 1% ≈9kΩ ±35% ≈9kΩ ±35% SUMJ 2.5V REF RESONATOR LOOP – Figure 15. Block Diagram with External Components |
类似零件编号 - ADXRS401ABG |
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类似说明 - ADXRS401ABG |
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