8.3.4 Stability

The REF60xx family of voltage references are stable with output capacitor values ranging from 10 µF to 47 µF.

At a low output-capacitor value of 10 µF, an effective series resistance (ESR) of 20mΩ to 100mΩ is required for

stability; whereas, at a higher value of 47 µF, an ESR of 5mΩ to 100mΩ is required. The shaded region in Figure

8-5 shows the stable region of operation for the REF60xx devices.

20

40

60

80

100

120

10

20

30

40

50

Output Capacitor (µF)

Figure 8-5. Stable Output Capacitor Range

A capacitor of value 1 µF is required at the FILT pin for stability and noise performance. A low ESR (5mΩ to

20mΩ) is easily achieved by increasing the PCB trace length, thus eliminating the need for a discrete resistor.

Higher values of ESR (greater than 20mΩ, but lesser than 100mΩ) can be intentionally added to increase the

output bandwidth of the REF60xx. This higher ESR improves the transient performance of the REF60xx, but

worsens noise performance because of increased bandwidth.

8.4 Device Functional Modes

When the EN pin of the REF60xx is pulled high, the device is in active mode. The device must be in active mode

for normal operation.

To place the REF60xx into a shutdown mode, pull the ENABLE pin low. When in shutdown mode, the output

of the device becomes high impedance and the quiescent current of the device reduces to 1 µA (typ). See the

enable pin voltage parameter in Section 6.5 for logic high and logic low voltage levels.

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REF60

SBOS708C – MAY 2016 – REVISED APRIL 2026

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