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Data Sheet

ADR3625/ADR3630/ADR3650

APPLICATIONS INFORMATION

analog.com

Rev. A | 23 of 26

SETTLING TIME

The ADR3625\ADR3630\ADR3650 can take up to 16 V supply,

source 50 mA, and sink 10 mA. The output settling time is de-

pendent upon the output capacitance and load current. Figure 71

through Figure 74 show the transient response of the ADR3625

example at different conditions.

Figure 71. ADR3625 10 mA Sourcing Response

Figure 72. ADR3625 10 mA Sinking Response

Figure 73. ADR3625 50 mA Sourcing Response

Figure 74. ADR3625 Output Response with a 500 mV Step on VIN

ENABLE PIN

The ENABLE pin is compatible with 1.8 V thresholds and has an

internal active pull-up. When powered down, the supply current is

only 1.5 µA typical.

There is no diode connected between the ENABLE pin and VIN.

The ENABLE pin can be driven high when VIN is low without

drawing current or powering the device through the ENABLE pin as

can happen with other references.

PCB LAYOUT

The mechanical stress of soldering a surface-mount voltage refer-

ence to a PCB can cause the output voltage to shift and the

temperature coefficient to change. These two changes are not

correlated. For example, the voltage may shift but the temperature

coefficient may not.

To reduce the effects of the stress-related shifts, mount the refer-

ence near the short edge of the PCB or in a corner. In addition,

slots can be cut into the PCB on two sides of the device. For more

information, see Application Note AN82.

Connect the output capacitor close to the VOUT FORCE pin. For

good load regulation, connect the VOUT SENSE pin directly at the

load, as shown in Figure 75.

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