1

6

2

3

4

GND_F

GND_S

EN

OUT_F

IN

REF34XX

C

5 OUT_S

22

REF3425-Q1, REF3430-Q1, REF3433-Q1, REF3440-Q1, REF3450-Q1

SBAS901 – JULY 2018

www.ti.com

Product Folder Links: REF3425-Q1 REF3430-Q1 REF3433-Q1 REF3440-Q1 REF3450-Q1

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Copyright © 2018, Texas Instruments Incorporated

11 Power Supply Recommendations

The REF34xx-Q1 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. TI recommends a supply bypass capacitor

ranging between 0.1 µF to 10 µF.

12 Layout

12.1 Layout Guidelines

Figure 32 illustrates an example of a PCB layout for a data acquisition system using the REF34xx-Q1. Some key

considerations are:

•

•

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

•

Using a solid ground plane helps 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.

•

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.

12.2 Layout Example

Figure 32. Layout Example