DAC712PLG4 datasheet(15/23 Pages) TI1

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LOAD CONNECTIONS

Sense

Output

AlternateGround

SenseConnection

SystemGround

ACOM

DCOM

Bus

Interface

DAC712

Analog

Power

Supply

0.01 F

(1)

0.01 F

To+V

To V

OUT

10kW

REF

DAC712

www.ti.com ................................................................................................................................................. SBAS023A – SEPTEMBER 2000 – REVISED JULY 2009

In some applications it is impractical to return the load

to the ACOM pin of the D/A converter. Sensing the

Because the reference point for VOUT and VREF OUT is

output voltage at the SYSTEM GROUND point is

the ACOM pin, it is important to connect the D/A

reasonable, because there is no change in the

converter load directly to the ACOM pin; see

DAC712 ACOM current, provided that R3 is a

Figure 12.

low-resistance ground plane or conductor. In this

case,

DCOM

may

connected

SYSTEM

Lead and contact resistances are represented by R1

GROUND as well.

through R3. As long as the load resistance RL is

constant, R1 simply introduces a gain error and can

be removed by gain adjustment of the D/A converter

or system-wide gain calibration. R2 is part of RL if the

output voltage is sensed at ACOM.

(1) Locate close to the DAC712 package.

Figure 12. System Ground Considerations for High-Resolution D/A Converters

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