DAC7573IPW datasheet(23/26 Pages) TI

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Output Op Amp

3-5

EVM Operation

3.4.3

Capacitive Load Drive

Another output configuration option is to drive a wide range of capacitive loads.

All op amps under certain conditions may become unstable depending on

configuration, gain, and load value. In unity gain, the OPA627 op amp performs

well with large capacitive loads. Increasing the gain and adding a load resistor

further improves the capacitive load drive capability.

Table 3 - 5 shows the proper jumper settings of the EVM for the 2

× gain output

of the DAC.

Table 3 - 5. Capacitive-Load Drive Jumper Settings

Reference

Jumper Setting

Function

Reference

Unipolar

Bipolar

Function

Open

VREFH is disconnected from the inverting in-

put of output op amp U2.

2-3

1-2

Supplies power, VSS, to the negative rail of op

amp U2 for bipolar supply, or ties it to AGND

for unipolar supply.

W15

Open

Capacitive load drive output of DAC is routed

to jumper-W15 pin 1, and this pin can be used

as the output terminal.

3.4.4

Optional Signal Conditioning Op Amp (U8B)

One device of the dual - op amp OPA2132 (U8) is used for reference buffering

(U8A), while the other is unused. This unused op amp (U8B) is available for

user - configured circuitry. The 1206- package resistor and capacitor footprints

associated with the U8B op amp are unpopulated and available for easy

configuration. TP6 and TP7 test points are not installed for maximum flexibility

of input - signal configuration. No test point is available for the output due to

space restrictions, but a wire can be simply soldered to the output of the op

amp via the unused component pads connected to it.

Once the op amp circuit design is determined, it is easily implemented by

simply populating the desired components and leaving unused component

footprints unpopulated.

DAC7573IPW Datasheet(PDF) 23 Page - Texas Instruments

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