전자부품 데이터시트 검색엔진 |
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ADXRS401 데이터시트(PDF) 8 Page - Analog Devices |
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ADXRS401 데이터시트(HTML) 8 Page - Analog Devices |
8 / 12 page ADXRS401 Rev. 0 | Page 8 of 12 THEORY OF OPERATION AGND TEMP ST2 ST1 PGND CP1 CP2 CP4 RATEOUT CP4 PDD CMID SUMJ COUT = 22nF 2.5V 6A 5A 4A 3A 2A 1B 1C 1D 1E 1F 7B 7C 7D 7E 7F 6G 5G 4G 3G 2G CP5 CP3 100nF 22nF AVCC 100nF 100nF PGND 22nF 1 µF 5V Figure 14. Example Application Circuit (Top View) Note that inner rows/columns of pins have been omitted for clarity but should be connected in the application. The ADXRS401 operates on the principle of a resonator gyro. Two polysilicon sensing structures each contain a dither frame, which is electrostatically driven to resonance. This produces the necessary velocity element to produce a Coriolis force during angular rate. At two of the outer extremes of each frame, orthogonal to the dither motion, are movable fingers that are placed between fixed pickoff fingers to form a capacitive pickoff structure that senses Coriolis motion. The resulting signal is fed to a series of gain and demodulation stages that produce the electrical rate signal output. The dual- sensor design rejects external g-forces and vibration. Fabricating the sensor with the signal conditioning electronics preserves signal integrity in noisy environments. The electrostatic resonator requires 14 V to 16 V for operation. Since only 5 V is typically available in most applications, a charge pump is included on-chip. If an external 14 V to 16 V supply is available, the two capacitors on CP1 to CP4 can be omitted and this supply can be connected to CP5 (Pin 7D) with a 1 µF decoupling capacitor. After the demodulation stage there is a single-pole low-pass filter consisting of an internal 9 kΩ resistor (RSEN1) and an external user-supplied capacitor (CMID). A CMID capacitor of 100 nF sets a 400 Hz low-pass pole ± 35% and is used to limit high frequency artifacts before final amplification. A bandwidth limit capacitor, COUT, sets the pass bandwidth (see Setting Bandwidth section). SUPPLY AND COMMON CONSIDERATIONS Only power supplies used for supplying analog circuits are recommended for powering the ADXRS401. High frequency noise and transients associated with digital circuit supplies may have adverse affects on device operation. 1 µF shows the recommended connections for the ADXRS401 where both AVCC and PDD have a separate decoupling capacitor. These should be placed as close to their respective pins as possible before routing to the system analog supply. This will minimize the noise injected by the charge pump that uses the PDD supply. It is also recommended to place the charge pump capacitors connected to the CP1 to CP4 pins as close to the part as possible. These capacitors are used to produce the on-chip high voltage supply switched at the dither frequency at approximately 14 kHz. Care should be taken to ensure that there is no more than 50 pF of stray capacitance between CP1 to CP4 and ground. Surface-mount chip capacitors are suitable as long as they are rated for over 15 V. |
유사한 부품 번호 - ADXRS401_15 |
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유사한 설명 - ADXRS401_15 |
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