OA1MPA Datasheet, PDF (19/28 Pages) STMicroelectronics – Medical instrumentation

OA1MPA, OA2MPA, OA4MPA
Application information
4.6
Initialization time
The OA1MPA, OA2MPA, and OA4MPA series of devices use a proprietary trimming
topology that is initiated at each device power-up and allows excellent V_io performance to be
achieved. The initialization time is defined as the delay after power-up which guarantees
operation within specified performances. During this period, the current consumption (I_CC)
and the input offset voltage (V_io) can be different to the typical ones.
Figure 22. Initialization phase
The initialization time is V_CC and temperature dependent. Table 7 sums up the
measurement results for different supply voltages and for temperatures varying from -40 °C
to 125 °C.
V_CC (V)
1.8
3.3
5
Table 7. Initialization time measurement results
Temperature: -40 °C
Temperature: 25 °C
Temperature: 125 °C
T_init (ms)
37
2.9
2.4
I_CC phase 1 (mA)
0.33
1.4
3.2
T_init (ms)
3.2
0.95
0.85
I_CC phase 1 (mA)
0.40
1.3
2.4
T_init (ms)
0.35
0.34
0.31
I_CC phase 1 (mA)
0.46
1.2
2.9
4.7
PCB layouts
For correct operation, it is advised to add a 10 nF decoupling capacitors as close as
possible to the power supply pins.
DocID025992 Rev 1
19/28
28