ADA4622-4ARZ-R7 datasheet(29/38 Pages) AD

29 / 38 page

Data Sheet

ADA4622-1/ADA4622-2/ADA4622-4

Rev. E | Page 29 of 38

SHUTDOWN OPERATION

Use the active low DISABLE input to put the ADA4622-1 into

shutdown mode. When the voltage on the DISABLE input is

less than 1.4 V above the negative supply voltage (V−), the

ADA4622-1 shuts down and consumes only 50 µA to 60 µA

(typical). When the voltage on the DISABLE input is more than

1.4 V above the negative supply voltage (V−), or if the DISABLE

input is left floating, the ADA4622-1 powers up. For best

performance, it is recommended that the input voltage level on

the DISABLE input be V− or that the input be left floating. The

ADA4622-1 is still a drop-in replacement for devices with

standard single channel op amp pinouts because the ADA4622-1

enables when the DISABLE input is left floating. Figure 87

shows a simplified circuit for the DISABLE input.

DISABLE

MIRROR

IOUT

Figure 87. Simplified Circuit for the DISABLE Input

Figure 88 and Figure 89 show the start-up and shutdown

response when toggling the DISABLE input.

CH1 50mV

CH2 5V

M1.00µs

A CH2

–11.5V

49.8%

Δ: 1.12µs

Δ: 5mV

@: 1.10µs

@: –1mV

Figure 88. Start-Up Response when Toggling the DISABLE Input

CH1 100mV

CH2 5V

M1.00µs

A CH2

–11.5V

49.8%

Δ: 1.98µs

Δ: 2mV

@: –60ns

@: 2mV

Figure 89. Shutdown Response when Toggling the DISABLE Input

Figure 90 shows the DISABLE input current vs. the DISABLE

input voltage relative to the negative supply voltage (V−).

DISABLE INPUT VOLTAGE RELATIVE TO V– (V)

Figure 90. DISABLE Input Current vs. DISABLE Input Voltage Relative to V−

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