DocID15689 Rev 6

15/24

TSV62x, TSV62xA

Application information

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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/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.