DRV5053 Datasheet, PDF (14/25 Pages) Texas Instruments – DRV5053 Analog-Bipolar Hall Effect Sensor

DRV5053
SLIS153C – MAY 2014 – REVISED DECEMBER 2015
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8.2.2.2 Detailed Design Procedure
In this example we will add an external RC filter in order to reduce the output bandwidth.
In order to preserve the signal at the frequencies of interest, we will conservatively select a low-pass filter
bandwidth (–3-dB point) at twice the system bandwidth (10 kHz).
1
10 kHz
2p ´ R₁ ´ C₂
(1)
If we guess R1 = 10 kΩ, then C2 < 1590 pF. So we select C2 = 1500 pF.
8.2.2.2.1 Typical Noise Versus Cutoff Frequency
RC filters are an effective way to reduce the noise present on OUT. The following shows typical noise
measurements for different cutoff frequencies using the DRV5053VA.
Table 5. DRV5053VA Typical Noise Data
R (Ω)
163
349
750
1505
3322
7510
C (µF)
0.1
0.1
0.1
0.1
0.1
0.1
f_CUTOFF (kHz)
9.8
4.6
2.1
1.1
0.5
0.2
NOISE (mVpp)
30.4
22.8
15.2
9.7
5.3
2.5
8.2.2.3 Application Curves
Figure 15. 5-kHz Switching Magnetic Field
0
-2
-4
-6
-8
-10
-12
-14
100 200
500 1000 2000 5000 10000
Frequency (Hz)
R1 = 10-kΩ pullup
C2 = 680 pF
Figure 16. Low-Pass Filtering
100000
D011
9 Power Supply Recommendations
The DRV5053 device is designed to operate from an input voltage supply (VM) range between 2.5 and 38 V. A
0.01-µF (minimum) ceramic capacitor rated for V_CC must be placed as close to the DRV5053 device as possible.
14
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