AD9735BBC datasheet(52/72 Pages) AD

52 / 72 page

AD9734/AD9735/AD9736

Rev. A | Page 52 of 72

DC-COUPLED DAC OUTPUT

In some cases, it may be desirable to dc-couple the AD973x

output. The best method for doing this is shown in Figure 94.

This circuit can be used with voltage or current feedback

amplifiers. Because the DAC output current is driving a virtual

ground, this circuit may offer enhanced settling times. The

settling time is limited by the op amp rather than by the DAC.

This circuit is intended for use where the amplifiers can be

IOUTA

DAC

OUTPUT

20mA

FULL SCALE

IOUTB

100

500

100

500

AVSS

OUTPUT

2V p-p

+1V TO –1V

2V p-p

0V TO –2V

Figure 94. Op Amp I to V Conversion Output Circuit

An alternate circuit is shown in Figure 95. It suffers from dc

offset at the output unless the DAC load resistors are small,

relative to the amplifier gain and feedback resistors.

IOUTA

OUTPUT

AVSS

IOUTB

AVSS

DAC OUTPUT

20mA

FULL SCALE

2V p-p

0V TO –2V

0.5V p-p

0V TO –0.5V

Figure 95. Differential Op Amp Output Circuit

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