Ultralow Power SD Video Filter
Data Sheet
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FEATURES
Third-order, low-pass video filter
1 dB flatness out to 6 MHz
27 dB rejection at 27 MHz
Low quiescent current: 4.7 mA typical
Low power-down current: 24 µA typical
Load detection capability
SAG correction
Allows use of smaller capacitors in ac-coupled outputs
Low supply voltage: 2.5 V to 3.6 V
Charge pump
Creates a negative voltage from single positive supply
Allows capless output coupling with no dc offset
Rail-to-rail output
High input-to-output isolation in disabled state
89 dB @ 1 MHz
Small package
3 mm × 3 mm LFCSP
Low 0.55 mm package height
Wide operating temperature range: −40°C to +85°C
APPLICATIONS
Portable media players
Portable gaming consoles
Cell phones
Digital still cameras
Portable DVD players
Portable video cameras
PIN CONFIGURATION
1
2
3
GND
SUBS
+V
S
4
CAP1
12
10
9
+V
S
DIS
11
IN
LDO
7
CAP3
8
CAP4
6
GND
5
CAP2
13
FB1
14
FB2
15
OUT
16
SAG
LOAD
DETECT
LPF
G = 2
CHARGE PUMP
06734-001
Figure 1.
LPF
x1 x2
OUT
IN
75Ω
4
3
2
7
5 6 8 9
11 12
VIDEO
DAC/
ENCODER
SYSTEM
CONTROLLER
LDO
DIS
GND
CAP4 CAP3
0.1µF
CAP2 CAP1
0.1µF
SUBS GND
1.0µF
SAG
FB1
FB2
14
15
16
13
VIDEO
OUT
0.1µF
0.1µF
+V
S
+V
S
+V
S
ADA4431-1
1 10
06734-002
Figure 2. Typical Application Circuit
GENERAL DESCRIPTION
The ADA4431-1 is a fully integrated video reconstruction filter
that combines excellent video specifications with low power
consumption, making it ideal for portable video filtering
applications. The ADA4431-1 is able to detect whether a video
load is present at the output, powering down the device when
the load is disconnected.
The ADA4431-1 operates on single supplies as low as 2.5 V
while providing the dynamic range required by the most
demanding video systems. The on-board charge pump
provides a virtual negative supply, allowing the video signal to
be dc-coupled and the black level to be set to ground, while the
sync passes cleanly at 300 mV below ground.
When operating with the charge pump off, the ADA4431-1
provides a dc offset to keep the sync tip approximately 100 mV
above ground. In addition, the part features SAG correction,
which permits the use of smaller capacitors in applications with
ac-coupled outputs.
The ADA4431-1 is packaged in a low profile 16-lead LFCSP and
operates in the industrial temperature range of −40°C to +85°C.
