ADS5271 datasheet(37/42 Pages) TI2

37 / 42 page

ADS5287

www.ti.com

SBAS428D – JANUARY 2008 – REVISED JUNE 2012

Smaller effective inductance of the supply and ground

It is recommended that the isolation be maintained on

pins leads to better noise suppression. For this

the board by using separate supplies to drive AVDD

reason, multiple pins are used to drive each supply

and LVDD, as well as separate ground planes for

and ground. It is also critical to ensure that the

AVSS and LVSS. The use of LVDS buffers reduces

impedances of the supply and ground lines on the

the injected noise considerably, compared to CMOS

board are kept to the minimum possible values. Use

buffers.

The

current

the

LVDS

buffer

of ground planes in the printed circuit board (PCB) as

independent of the direction of switching. Also, the

well as large decoupling capacitors between the

low output swing as well as the differential nature of

supply and ground lines are necessary to obtain the

the LVDS buffer results in low-noise coupling.

best possible SNR performance from the device.

ADS5271 Datasheet(PDF) 37 Page - Texas Instruments