REF6225 datasheet(28/35 Pages) TI1

28 / 35 page

RSS

CFILT

RESR

CIN

REF62xx

AGND

VOUT

REFP

REFM

ADC

AGND

VIN

REF6225, REF6230, REF6233, REF6241, REF6245, REF6250

SBOS748 – SEPTEMBER 2016

www.ti.com

Product Folder Links: REF6225 REF6230 REF6233 REF6241 REF6245 REF6250

Submit Documentation Feedback

11 Layout

11.1 Layout Guidelines

Figure 61 illustrates an example of a PCB layout for a data-acquisition system using the REF62xx. Some key

considerations are:

•

Connect low-ESR, 0.1-μF ceramic bypass capacitors between the VIN pin and ground.

•

Place the REF62xx output capacitor (CL) and the ADC as close to each other as possible.

•

Run two separate traces between VOUT_F, VOUT_S and the output capacitor, as shown in Figure 61.

•

Short the GND_F and GND_S pins with a solid plane, and extend this plane to connect to the output

capacitor CL, as shown in Figure 61.

•

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.

•

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 61. Layout Example

REF6225 датащи(PDF) 28 Page - Texas Instruments