7.3.4 Output Enable and Disable

The OPA593 incorporates an enable and disable feature that uses the E/D pin to disable the output stage of

the amplifier, which reduces the power consumption of the op amp and switches the output to a high-impedance

state.

The E/D pin is referenced to the E/D Com pin. If left floating, the E/D pin is internally pulled up to enable the

device. If externally controlled, the E/D pin must be supplied with a voltage between 1.5 V and 5.5 V greater than

the E/D Com pin voltage. Even though the OPA593 output is enabled with a floating E/D pin, a moderately fast,

negative-going signal capacitively coupled to the E/D pin can overpower the internal pullup and cause device

shutdown. If the enable function is not used, a conservative and recommended approach is to connect E/D

through a 47-pF capacitor to E/D Com. Figure 7-3 shows different ways to connect the E/D and E/D Com pins.

+

–

OPA593

E/D

Com

E/D

V

V+

VOUT

VIN+

VIN

47 pF

GND

GND

+

–

OPA593

E/D

Com

E/D

V

V+

VOUT

VIN+

VIN

GND

GND

DVDD

(Digital Supply)

3-V or

5-V

Logic

Figure 7-3. E/D and E/D Com Pin Connections

When the E/D pin is dropped to a voltage between 0 V and 0.5 V greater than the E/D Com pin voltage, the

output of the OPA593 is disabled. When disabled, the output of the OPA593 is set to a high-impedance state.

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OPA593

SBOS659C – JANUARY 2022 – REVISED DECEMBER 2022

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Product Folder Links: OPA593