ADA4430-1

Rev. C | Page 13 of 20

APPLICATIONS INFORMATION

EXAMPLES ILLUSTRATING OUTPUT COUPLING

The ADA4430-1 is ideally suited for use as a reconstruction

filter that follows a video DAC or encoder. The application

circuits in Figure 29, Figure 30, and Figure 31 illustrate a

number of ways the ADA4430-1 can be used with a single-

supply current-output DAC on its input and its output ac- and

dc-coupled.

SAG correction allows the use of two small, lower cost

capacitors in place of one large capacitor in applications with

ac-coupled outputs. Circuits with ac-coupled outputs consume

less power than those with dc-coupled outputs.

2.6kΩ

2.6kΩ

2.6kΩ

1.3kΩ

SAG

GND

VIN

VOUT

RL

VIDEO OUT

DIS

VS

3V

DISABLE CONTROL

0.1µF

ADA4430-1

1

2

3

4

56

VIDEO

DAC/ENCODER

75Ω

47µF

22µF

×1

Figure 29. AC-Coupled Output with SAG Correction

2.6kΩ

2.6kΩ

2.6kΩ

1.3kΩ

SAG

GND

VIN

VOUT

RL

VIDEO OUT

3V

DISABLE CONTROL

0.1µF

ADA4430-1

1

2

3

4

56

VIDEO

DAC/ENCODER

75Ω

220µF

DIS

VS

×1

Figure 30. Traditional AC-Coupled Output with 220 μF Coupling Capacitor

2.6kΩ

2.6kΩ

2.6kΩ

1.3kΩ

SAG

GND

VIN

VOUT

RL

VIDEO OUT

3V

DISABLE CONTROL

0.1µF

ADA4430-1

1

2

3

4

56

VIDEO

DAC/ENCODER

75Ω

DIS

VS

×1

Figure 31. DC-Coupled Output