ADA4430-1 Analog Devices, ADA4430-1 Datasheet - Page 12

• Manufacturer Part Number: ADA4430-1
• Description: Ultralow Power Video Filter
• Manufacturer: Analog Devices

ADA4430-1
APPLICATIONS
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.
POWER-DOWN CONTROL
POWER-DOWN CONTROL
DAC/ENCODER
POWER-DOWN CONTROL
DAC/ENCODER
DAC/ENCODER
VIDEO
VIDEO
VIDEO
Figure 30. Traditional AC-Coupled Output with 220 μF Coupling Capacitor
R
R
L
L
Figure 29. AC-Coupled Output with SAG Correction
R
1
2
3
1
2
3
L
ADA4430-1
ADA4430-1
V
GND
SAG
V
GND
SAG
1
2
3
IN
IN
ADA4430-1
V
GND
SAG
IN
×1
×1
×1
Figure 31. DC-Coupled Output
2.6kΩ
2.6kΩ
2.6kΩ
Rev. A | Page 12 of 16
2.6kΩ
22µF
2.6kΩ
2.6kΩ
1.3kΩ
1.3kΩ
PD
1.3kΩ
2.6kΩ
PD
2.6kΩ
5
PD
5
2.6kΩ
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.
5
3V
3V
6
V
6
V
3V
S+
S+
6
V
V
V
S+
OUT
OUT
0.1µF
0.1µF
V
0.1µF
OUT
4
4
4
47µF
220µF
75Ω
75Ω
75Ω
VIDEO OUT
VIDEO OUT
VIDEO OUT