Application information

Document header RPN(s)

14/24

DocID14912 Rev 3

3.5

Optimization of DC and AC parameters

This device uses an innovative approach to reduce the spread of the main DC and AC

parameters. An internal adjustment achieves a very narrow spread of current consumption

(29 µA typical, min/max at ±17 %). Parameters linked to the current consumption value,

such as GBP, SR and AVd benefit from this narrow dispersion. All parts present a similar

speed and the same behavior in terms of stability. In addition, the minimum values of GBP

and SR are guaranteed (GBP = 350 kHz min, SR = 0.15 V/µs min).

3.6

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 in-series

resistor at the output can improve the stability of the device (see Figure 20 for

recommended in-series resistor values). Once the in-series resistor value has been

selected, the stability of the circuit should be tested on bench and simulated with the

simulation model.

Figure 20. In-series resistor vs. capacitive load

3.7

PCB layouts

For correct operation, it is advised to add 10 nF decoupling capacitors as close as possible

to the power supply pins.