ADA4432-1/ADA4433-1

Data Sheet

Rev. A | Page 18 of 28

CONFIGURING THE ADA4433-1 FOR SINGLE-

ENDED INPUT SIGNALS

The ADA4433-1 is a fully differential filter/driver that can be

used as a single-ended-to-differential amplifier or as a differential-

to-differential amplifier. In single-ended-to-differential output

applications, bias the −IN input appropriately to optimize the

output range. To make the most efficient use of the output range

of the ADA4433-1, especially with low supply voltages, it is

important to allow the differential output voltage to swing in

both a positive and negative direction around the output common-

differential input voltage must swing both positive and negative.

Figure 46 shows a 1 V p-p single-ended signal on +IN with −IN

grounded. This produces a differential input voltage that ranges

from 0 V to 1 V. The resulting differential output voltage is

ADA4433-1, the output voltage extends from 0.65 V to 2.65 V,

requiring a full 2 V of output to produce a 1 V p-p signal at the

receiver (represented by the voltage across 2R).

To make a more efficient use of the output range, the −IN input is

biased at the midpoint of the expected input signal range, as shown

in Figure 47. A 1 V p-p single-ended signal on +IN, with −IN

biased at 0.5 V, produces a differential input voltage that ranges

from −0.5 V to +0.5 V. The resulting differential output voltage

now contains both positive and negative components, where

level. Directly at the output of the ADA4433-1, the output

voltage now extends only from 1.15 V to 2.15 V, requiring only

1 V of the output to produce a 1 V p-p signal at the receiver.

Figure 46. Single-Ended-to-Differential Configuration with Negative Input (−IN) Connected to Ground

Figure 47. Single-Ended-to-Differential Configuration with Negative Input (−IN) Connected to 0.5 V

INPUT SIGNAL

ADA4433-1

1.65V

+

–

R

2R

2.65V

0.65V

R

0V

1.0V

1V p-p

DIFFERENTIAL OUTPUT SIGNAL

DIFFERENTIAL OUTPUT SIGNAL ACROSS 2R

1V p-p

INPUT SIGNAL

ADA4433-1

1.65V

+

–

R

2R

1.15V

2.15V

R

0V

0.5V

1.0V

1V p-p

DIFFERENTIAL OUTPUT SIGNAL

DIFFERENTIAL OUTPUT SIGNAL ACROSS 2R

1V p-p