11 Power Supply Recommendations

The REF34-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 12-1 illustrates an example of a PCB layout for a data acquisition system using the REF34-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

1

6

2

3

4

GND_F

GND_S

EN

OUT_F

IN

REF34XX

C

5 OUT_S

Figure 12-1. Layout Example (REF34xx-Q1)

1

5

2

3

4

NIC

OUT

REF34S-Q1

C

OUT

IN

GND

NC

C

IN

Figure 12-2. Layout Example (REF34xxS-Q1)

REF34-Q1

SBAS901B – JULY 2018 – REVISED SEPTEMBER 2020

www.ti.com

22

Submit Document Feedback

Copyright © 2020 Texas Instruments Incorporated

Product Folder Links: REF34-Q1