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AD22151YR Folha de dados(PDF) 6 Page - Analog Devices |
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AD22151YR Folha de dados(HTML) 6 Page - Analog Devices |
6 / 8 page AD22151 –6– REV. 0 Knowing the values of R3 and R4 from above, and noting Equa- tion 2, the parallel combination of R2 and R4 required is: 85 k Ω 15 –1 () = 6.071 kΩ Thus: R2 = 1 1 6.071 k Ω – 1 141.666 k Ω = 6.342 kΩ NOISE The principle noise component in the sensor is thermal noise from the Hall cell. Clock feedthrough into the output signal is largely suppressed with application of a supply bypass capacitor. Figure 12 shows the power spectral density (PSD) of the output signal for a gain of 5 mV/Gauss. The effective bandwidth of the sensor is approximately 5.7 kHz. This is shown by Figure 13 small signal bandwidth vs. gain. The PSD indicates an rms noise voltage of 2.8 mV within the 3 dB bandwidth of the sen- sor. A wideband measurement of 250 MHz indicates 3.2 mV rms (see Figure 14a). In many position sensing applications bandwidth requirements can be as low as 100 Hz. Passing the output signal through an LP filter, for example 100 Hz, would reduce the rms noise volt- age to ≈1 mV. A dominant pole may be introduced into the output amplifier response by connection of a capacitor across feedback resistor R3, as a simple means of reducing noise at the expense of bandwidth. Figure 14b indicates the output signal of a 5 mV/G sensor bandwidth limited to 180 Hz with a 0.01 µF feedback capacitor. Note: Measurements taken with 0.1 µF decoupling capacitor between VCC and GND at +25 °C. LOGMAG 5 dB /div 100 H 1 H START: 64 Hz NOISE: PSD (8 mV/GAUSS) STOP: 25.6 kHz RMS: 64 B MARKER X 64Hz Y: 3.351 H Figure 12. Power Spectral Density (5 mV/G) 3dB FREQ. (kHz) GAIN – mV/GAUSS 7 6 2 5 3 4 12 3 1 0 45 6 Figure 13. Small-Signal Gain Bandwidth CH2 10.0mV BW M2.00ms 2 TEK STOP: 25.0 kS/s [ [ T 3ACQS T CH2 PK-PK 19.2mV Figure 14a. Peak-to-Peak Full Bandwidth (10 mV/Division) CH2 10.0mV BW M2.00ms 2 TEK STOP: 25.0 kS/s [ [ T 7ACQS T CH2 PK-PK 4.4mV Figure 14b. Peak-to-Peak 180 Hz Bandwidth (10 mV/Division) |
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