LMV820ILT datasheet(17/32 Pages) STMICROELECTRONICS

17 / 32 page

LMV82x, LMV82xA

Application information

Doc ID 022467 Rev 3

17/32

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

L 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

L connected to GND

Time(µs)

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