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DATA CONVERTERS

-

+

-

+

3.3 V

3.3 V

0.1

µF

-

+

-

+

3.3 V

0.1

µF

R

PU +

V

P

– V

DD

V

IN

– V

P

1

R

(g)

) VOUT – VP

1

R

f

(2)

THS4120

THS4121

SLOS319D – FEBRUARY 2001 – REVISED OCTOBER 2004

APPLICATION INFORMATION (continued)

Data converters are one of the most popular applications for the fully differential amplifiers.

differential output may be fed into a data converter. This method eliminates the use of a transformer in the

of the amplifier using a bypass capacitor for stability. For proper operation, the input common-mode voltage to

the input terminal of the amplifier should not exceed the common-mode input voltage range.

Figure 19. Differential Amplifier Using a Single Supply

Some single-supply applications may require the input voltage to exceed the common-mode input voltage range.

In such cases, the following circuit configuration is suggested to bring the common-mode input voltage within the

specifications of the amplifier.

Figure 20. Circuit With Improved Common-Mode Input Voltage

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