TSV62x

Application information

Doc ID 15689 Rev 2

15/25

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 k

Ω. 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 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 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.