ADA4431-1 Datasheet, PDF (1/12 Pages) Analog Devices – Ultralow Power SD Video Filter with Load Detection

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
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.
Ultralow Power SD Video Filter
with Load Detection
ADA4431-1
PIN CONFIGURATION
+V_S 1
IN 2
DIS 3
LDO 4
LOAD
DETECT
LPF G = 2
CHARGE PUMP
12 GND
11 SUBS
10 +V_S
9 CAP1
Figure 1.
+V_S
SYSTEM
CONTROLLER
VIDEO
DAC/
ENCODER
0.1µF
0.1µF
1
10
4
LDO
3
DIS
+V_S
+V_S
ADA4431-1
2 IN
x1
x2
LPF
16
FB1
15
FB2
VIDEO
OUT
OUT 14 75Ω
7
GND
13
SAG
CAP4 CAP3 CAP2 CAP1 SUBS GND
5
68
9 11
12
0.1µF
0.1µF
1.0µF
Figure 2. Typical Application Circuit
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.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
www.analog.com
Fax: [phone]
©2007 Analog Devices, Inc. All rights reserved.