ADS1610IPAPR.B datasheet(20/29 Pages) TI2

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(1)

AVDD

AGND

(1)

AVDD

AGND

AVDD

AGND

47mF

4.7 mF

1 mF

0.1

4.7

ADS1610

If using separate analog and

digital ground planes, connect

together on the ADS1610 PCB.

DGND

NOTES: (1) CP = 1 F

0.1 F

(2) Bypass

capacitors not required at pins 49 and 50.

AGND

AVDD

DVDD

Ω

LAYOUT ISSUES

ADS1610

SBAS344C – AUGUST 2005 – REVISED OCTOBER 2006

Figure 41. Recommended Power-Supply Bypassing

planes, one for the analog grounds and one for the

digital grounds. When using only one common plane,

isolate the flow of current on AGND2 (pin 57) from

The ADS1610 is a very high-speed, high-resolution

pin 1; use breaks on the ground plane to accomplish

data converter. In order to achieve the maximum

this. AGND2 carries the switching current from the

performance, careful attention must be given to the

analog clocking for the modulator and can corrupt

printed

circuit

board

(PCB)

layout.

Use

good

the quiet analog ground on pin 1. When using two

high-speed

techniques

for

all

circuitry.

Critical

planes, it is recommended that they be tied together

capacitors should be placed close to pins as

right at the PCB. Do not try to connect the ground

possible. These include capacitors directly connected

planes together after running separately through

to the analog and reference inputs and the power

edge

connectors

cables

this

reduces

supplies. Make sure to also properly bypass all

performance and increases the likelihood of latch-up.

circuitry driving the inputs and references.

Two approaches can be used for the ground planes:

either a single common plane; or two separate

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