8.3 Power Supply Recommendations

The REF30 family of references feature an extremely low-dropout voltage. These references can be operated

with a supply of only 50mV above the output voltage. For loaded reference conditions, a typical dropout voltage

versus load is shown in the front page plot, Dropout Voltage vs Load Current. Use a supply bypass capacitor

greater than 0.47µF.

8.4 Layout

8.4.1 Layout Guidelines

Figure 8-6 illustrates an example of a printed-circuit board (PCB) layout using the REF30. Some key

considerations are:

• Connect low-ESR, 0.1μF ceramic bypass capacitors at VIN of the REF30.

• Decouple other active devices in the system per the device specifications.

• Use a solid ground plane to help distribute heat and reduces electromagnetic interference (EMI) noise pickup.

• Place the external components as close to the device as possible. This configuration prevents parasitic errors

(such as the Seebeck effect) from occurring.

• Minimize trace length between the reference and bias connections to the INA and ADC to reduce noise

pickup.

• Do not run sensitive analog traces in parallel with digital traces. Avoid crossing digital and analog traces if

possible, and only make perpendicular crossings when absolutely necessary.

8.4.2 Layout Example

Figure 8-6. Layout Example

REF30, REF30E

SBVS032J – MARCH 2002 – REVISED JULY 2025

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