ADS1606IPAPR datasheet(26/38 Pages) TI

26 / 38 page

ADS1605

ADS1606

SBAS274H − MARCH 2003 − REVISED MAY 2007

www.ti.com

POWER SUPPLIES

Three supplies are used on the ADS1605/6: analog

(AVDD), digital (DVDD) and digital I/O (IOVDD). Each

supply must be suitably bypassed to achieve the best

performance. It is recommended that a 1

µF and 0.1µF

ceramic capacitor be placed as close to each supply pin

as possible. Connect each supply-pin bypass capacitor

to the associated ground, as shown in Figure 27. Each

main supply bus should also be bypassed with a bank

of capacitors from 47

µF to 0.1µF, as shown.

The IO and digital supplies (IOVDD and DVDD) can be

connected together when using the same voltage. In

this case, only one bank of 47

µF to 0.1µF capacitors is

needed on the main supply bus, though each supply pin

must still be bypassed with a 1

µF and 0.1µF ceramic ca-

pacitor.

AVDD

AGND

AVDD

AGND

AVDD

µF

µF4.7µF1µF0.1µF

0.1

µF

0.1

µF

4.7

µF

4.7

µF

ADS1605

ADS1606

If using separate analog and

digital ground planes, connect

together on the ADS1605/6 PCB.

DGND

NOTE: CP =1µF  0.1µF

AGND

AVDD

IOVDD

DVDD

Figure 27. Recommended Power-Supply Bypassing

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