Datasheet

Application information TSV99x, TSV99xA
12/25 Doc ID 12833 Rev 9
3 Application information
3.1 Driving resistive and capacitive loads
These products are low-voltage, low-power operational amplifiers optimized to drive rather
large resistive loads above 2
kΩ..
TSV99x products are not unity gain stable. To ensure proper stability they must be used in a
gain configuration, with a minimum gain of -3 or +4.
However, they can be used in a “follower“ configuration by adding a small, in-series resistor
at the output, which drastically improves the stability of the device (
Figure 15 shows the
recommended in-series resistor values). Once the in-series resistor value has been
selected, the stability of the circuit should be tested on the bench and simulated with the
simulation model.
Another way to improve stability and reduce peaking is to add a capacitor in parallel with the
feedback resistor. As shown in
Figure 16, the feedback capacitor drastically reduces the
peaking versus capacitive load (inverting gain configuration, gain = -2).
3.2 PCB layouts
For correct operation, it is advised to add 10 nF decoupling capacitors as close as possible
to the power supply pins.
Figure 15. In-series resistor vs. capacitive
load when TSV99x used in follower
configuration
Figure 16. Peaking versus capacitive load,
with or without feedback capacitor
in inverting gain configuration