LMV820 datasheet(17/32 Pages) STMICROELECTRONICS

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LMV82x, LMV82xA

Application information

4.7

Shutdown function

The operational amplifier is enabled when the SHDN pin is pulled high. To disable the

amplifier, the SHDN pin must be pulled down to VCC-. When in shutdown mode, the

amplifier output is in a high impedance state. The SHDN pin must never be left floating but

tied to VCC+ or VCC-.

The turn-on and turn-off times are calculated for an output variation of ±200 mV. Figure 21

and Figure 22 show the test configurations. Figure 23 and Figure 24 show the respective

results with these test configurations.

Figure 21. Test configuration for turn-on time

(Vout pulled down)

Figure 22. Test configuration for turn-off time

(Vout pulled down)

GND

Vcc

Vcc – 1V

GND

Vcc

Vcc – 1V

Figure 23. Turn-on time, VCC = 5 V,

Vout pulled down, T = 25 °C

Figure 24. Turn-off time, VCC = 5 V,

Vout pulled down, T = 25 °C

-0.1

0.0

0.1

0.2

0.3

0.4

0.5

-3

-2

-1

Shutdown pulse

Vout

Vcc = 5V

T = 25°C

connected to GND

Time(µs)

-0.05

0.00

0.05

0.10

0.15

0.20

-3

-2

-1

Shutdown pulse

Vout

Vcc = 5V

T = 25°C

connected to GND

Time(µs)

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