Datasheet
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
V
IN
V
OUT
R
L
VIDEO OUT
DIS
V
S
3V
DISABLE CONTROL
0.1µF
ADA4430-1
1
2
3
4
56
VIDEO
DAC/ENCODER
05885-027
75Ω
47µF
22µF
×1
Figure 29. AC-Coupled Output with SAG Correction
2.6kΩ
2.6kΩ
2.6kΩ
1.3kΩ
SAG
GND
V
IN
V
OUT
R
L
VIDEO OUT
3V
DISABLE CONTROL
0.1µF
ADA4430-1
1
2
3
4
56
VIDEO
DAC/ENCODER
0
5885-028
75Ω
220µF
DIS
V
S
×1
Figure 30. Traditional AC-Coupled Output with 220 μF Coupling Capacitor
2.6kΩ
2.6kΩ
2.6kΩ
1.3kΩ
SAG
GND
V
IN
V
OUT
R
L
V
IDEO OU
T
3
V
DISABLE CONTROL
0.1µF
ADA4430-1
1
2
3
4
56
VIDEO
DAC/ENCODER
05885-029
75Ω
DIS
V
S
×1
Figure 31. DC-Coupled Output