Data Sheet

ADR3625

APPLICATIONS INFORMATION

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Rev. 0 | 18 of 21

SETTLING TIME

The ADR3625 can take up to 16 V supply, source 50 mA, and

sink 10 mA. The output settling time is dependent upon the output

capacitance and load current. Figure 51 through Figure 54 show

the transient response of the device at different conditions.

Figure 51. 10 mA Sourcing Response

Figure 52. 10 mA Sinking Response

Figure 53. 50 mA Sourcing Response

Figure 54. 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 55.