TSV991 STMicroelectronics, TSV991 Datasheet - Page 10

• Manufacturer Part Number: TSV991
• Description: Rail to rail input/output high merit factor op-amps
• Manufacturer: STMicroelectronics

Specifications of TSV991

• Low Input Offset Voltage: 1.5 mV max (A grade)
• Low Power Consumption: 820 μA typ
• High Output Current: 35 mA

Application information
3
3.1
3.2
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Figure 15. In-series resistor vs. capacitive
Application information
Driving resistive and capacitive loads
These products are low-voltage, low-power operational amplifiers optimized to drive rather
large resistive loads above 2 kΩ .
The TSV99x 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
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.
Another way to improve stability and reduce peaking is to add a capacitor in parallel with the
feedback resistor. As shown in
peaking versus capacitive load (inverting gain configuration, gain = -2).
PCB layouts
For correct operation, it is advised to add 10 nF decoupling capacitors as close as possible
to the power supply pins.
load when TSV99x used in follower
configuration
Doc ID 12833 Rev 8
Figure
16, the feedback capacitor drastically reduces the
Figure 16. Peaking versus capacitive load,
with or without feedback capacitor
in inverting gain configuration
(Figure 15
TSV99x-TSV99xA
shows the