OPAMP Peripheral Features
The device integrates 2 operational amplifiers OPAMP1 & OPAMP2
1. The OPAMP(s) provides several exclusive running modes.
Standalone mode (external gain setting mode)
2. Each OPAMP(s) can be configured in normal and high speed mode.
3. The OPAMP(s) provide(s) calibration capabilities.
4. Running mode: Standalone mode
– Gain is set externally (gain depends on external loads).
– Follower mode also possible externally by connecting the inverting input to the output.
5. Running mode: Follower mode
– No Inverting Input is connected.
6. Running mode: Programmable Gain Amplifier (PGA) mode (Resistor feedback output)
7. The OPAMP(s) output(s) can be internally connected to resistor feedback output.
8. OPAMP gain can be selected as :
a. Gain of x2, x4, x8 or x16 for non inverting mode with:
◦ VREF- referenced.
◦ Filtering on VINM0, VREF- referenced.
◦ VINM0 node for bias voltage and VINP0 for input signal.
◦ VINM0 node for bias voltage and VINP0 for input signal, VINM1 node for filtering.
b. Gain of x-1, x-3, x-7 or x-15 for inverting mode with:
◦ VINM0 node for input signal and VINP0 for bias.
◦ VINM0 node for input signal and VINP0 for bias voltage, VINM1 node for filtering.
9. The OPAMPs inverting input can be selected.
10. The OPAMPs non inverting input can be selected.
Example of OPAMP Configuration
