DRV2625 Datasheet, PDF (9/77 Pages) Texas Instruments – DRV2625 Ultra Low Power Closed-Loop LRA/ERM Haptic Driver with Built-In Library

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DRV2625
SLOS879A – DECEMBER 2015 – REVISED DECEMBER 2015
7 Parameter Measurement Information
7.1 Test Setup for Graphs
To capture the graphs displayed in the Typical Characteristics section, the following first-order RC-filter setup
was used with the exception of the waveform in Figure 15 which was captured without any output filter. The filter
should be used when viewing output signals on an oscilloscope because output PWM modulation is present in all
modes. Ensure that effective impedance of the filter is not too low because the closed-loop and auto resonance-
tracking features can be affected. Therefore, TI recommends that this exact filter be used for output
measurement. Most oscilloscopes have an input impedance of 1 MΩ on each channel and therefore have an
approximately 1% loss in measured amplitude because of the voltage-divider effect with the filter.
OUT+
OUT±
LRA
M or
ERM
100 k
100 k
470 pF
Ch1
Ch1 ± Ch2
Ch2 (Differential)
470 pF
Oscilloscope
Figure 15. Test Setup
7.1.1 Default Test Conditions
• V_DD = 3.6 V, unless otherwise noted.
• Real actuators (as opposed to modeled actuators) were used as loads for both ERM and LRA modes unless
otherwise noted.
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