SLIS162H December 2014 – August 2018 DRV5013-Q1
In a 3.3-V system, 3.2 V ≤ Vref ≤ 3.4 V. Use Equation 3 to calculate the allowable range for R1.
For this design example, use Equation 4 to calculate the allowable range of R1.
After finding the allowable range of R1 (Equation 5), select a value between 500 Ω and 32 kΩ for R1.
Assuming a system bandwidth of 10 kHz, use Equation 6 to calculate the value of C2.
For this design example, use Equation 7 to calculate the value of C2.
An R1 value of 10 kΩ and a C2 value less than 820 pF satisfy the requirement for a 10-kHz system bandwidth.
A selection of R1 = 10 kΩ and C2 = 680 pF would cause a low-pass filter with a corner frequency of 23.4 kHz.