OUT

GND

IN

C

C

REF30xx

To ADC

To Input Power Supply

Via to Ground Plane

REF3012, REF3020, REF3025, REF3030, REF3033, REF3040

www.ti.com

SBVS032G – MARCH 2002 – REVISED NOVEMBER 2015

10 Power Supply Recommendations

The REF30xx family of references feature an extremely low-dropout voltage. These references can be operated

with a supply of only 50 mV 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 0.47 µF.

11 Layout

11.1 Layout Guidelines

Figure 34 illustrates an example of a printed circuit board (PCB) layout using the REF30xx. Some key

considerations are:

•

Connect low-ESR, 0.1-

•

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

11.2 Layout Example

Figure 34. Layout Example

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Product Folder Links: REF3012 REF3020 REF3025 REF3030 REF3033 REF3040