CD00234048 Datasheet, PDF (15/25 Pages) STMicroelectronics – Rail-to-rail input/output, 29 μA, 420 kHz CMOS operational

TSV62x, TSV62xA
Application information
4.6
Driving resistive and capacitive loads
These products are micro-power, low-voltage operational amplifiers optimized to drive
rather large resistive loads, above 5 kΩ. For lower resistive loads, the THD level may
significantly increase.
In a follower configuration, these operational amplifiers can drive capacitive loads up to
100 pF with no oscillations. When driving larger capacitive loads, adding a small resistor in
series at the output can improve the stability of the device (see Figure 22 for recommended
in-series resistor values). Once the value of the in-series resistor has been selected, the
stability of the circuit should be tested on bench and simulated with the simulation model.
Figure 22. In-series resistor vs. capacitive load
4.7
PCB layouts
For correct operation, it is advised to add 10 nF decoupling capacitors as close as possible
to the power supply pins.
4.8
Macromodel
Two accurate macromodels (with or without shutdown feature) of TSV62x/TSV62xA are
available on STMicroelectronics’ web site at www.st.com. This model is a trade-off between
accuracy and complexity (that is, time simulation) of the TSV62x/TSV62xA operational
amplifiers. It emulates the nominal performances of a typical device within the specified
operating conditions mentioned in the datasheet. It helps to validate a design approach and
to select the right operational amplifier, but it does not replace on-board measurements.
Doc ID 15689 Rev 5
15/25