DAC6573IPW datasheet(22/26 Pages) TI

22 / 26 page

Output Op Amp

3-4

3.4.1

Unity Gain Output

The buffered output configuration can be used to prevent loading the DAC.

However, it may present some slight distortion because of the feedback

resistor and capacitor. The user can tailor the feedback circuit to closely match

the desired wave shape by simply removing R7 and C11 and replacing them

with the desired values. R7 can be replaced with a zero-ohm resistor and C11

can be left open, if desired.

Table 3 - 3 shows the jumper settings for the unity gain configuration of the

output buffer in unipolar or bipolar supply mode.

Table 3 - 3. Unity Gain Output Jumper Settings

Reference

Jumper Setting

Function

Reference

Unipolar

Bipolar

Function

Open

Disconnects TP2 input or AGND from the in-

verting input of the op amp

2-3

1-2

Supplies VSS to the negative rail of the op amp

or ties it to AGND

W15

Open

Disconnects negative input of the op amp

from AGND

3.4.2

Output Gain of Two

Table 3 - 4 shows the proper jumper settings of the EVM for the 2

× gain output

of the DAC.

Table 3 - 4. Gain of Two Output Jumper Settings

Reference

Jumper Setting

Function

Reference

Unipolar

Bipolar

Function

Closed

Inverting input of output op amp U2 is con-

nected to VREFH for use as its offset voltage

with a gain of 2. Jumper W15 must be open.

Open

VREFH is disconnected from the inverting in-

put of output op amp U2. Jumper W15 must

be closed.

2-3

1-2

Supplies power, VSS, to the negative rail of op

amp U2 for bipolar supply mode, or ties it to

AGND for unipolar supply mode

W15

Closed

Configures op amp U2 for a gain of 2 output

without an offset voltage. Jumper W3 must be

open.

W15

Open

Inverting input of op amp U2 is disconnected

from AGND. Jumper W3 must be closed.

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