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PDF ADA4431-1 Data sheet ( Hoja de datos )
| Número de pieza | ADA4431-1 | |
| Descripción | Ultralow Power SD Video Filter | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Data Sheet
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
+VS 1
IN 2
DIS 3
LDO 4
LOAD
DETECT
LPF G = 2
CHARGE PUMP
12 GND
11 SUBS
10 +VS
9 CAP1
Figure 1.
+VS
SYSTEM
CONTROLLER
VIDEO
DAC/
ENCODER
0.1µF
0.1µF
1 10
4
LDO
3
DIS
+VS +VS
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. A
Document Feedback
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor 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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2007–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
1 page  
ADA4431-1
VS = 3.0 V (@ TA = 25°C, VIN = 1 V p-p, RL = 150 Ω, DIS = floating, charge pump off), unless otherwise noted.
Table 2.
Parameter
ELECTRICAL SPECIFICATIONS
Quiescent Supply Current
Normal Mode
Load Searching Mode
Disabled Mode
Disable Pin Current
Supply Voltage Range
Input Voltage
Input Resistance
Input Capacitance
Output Voltage Range
Output Offset Voltage
Power Supply Rejection
Pass-Band Gain
Input-to-Output Isolation—Disabled
FILTER CHARACTERISTICS
−3 dB Bandwidth
1 dB Flatness
Out-of-Band Rejection
Differential Gain
Differential Phase
Linear Output Current
Group Delay Variation
Test Conditions/Comments
Video load present
No video load
DIS = 0 V
DIS = 0 V
Limited by output range
f = 100 kHz, output referred
f = 1 MHz, DIS = 0 V
f = 27 MHz
Modulated 10 step ramp, sync tip at 0 V
Modulated 10 step ramp, sync tip at 0 V
f = 100 kHz to 5 MHz
Min Typ
1.6
0.1
24
−17
2.5
1.3
10
1
0 to 2.8
0.1
38 48
5.8 6.0
89
6.2 7.5
6
26 29
0.4
0.3
40
30
Data Sheet
Max Unit
2.2 mA
mA
µA
−30 µA
3.6 V
V
MΩ
pF
V
0.2 V
dB
6.2 dB
dB
8.4 MHz
MHz
dB
%
Degrees
mA
ns
Rev. A | Page 4 of 12
5 Page 
ADA4431-1
EVALUATION BOARD
The ADA4431-1 evaluation board allows designers to assess
the performance of the part in their particular application. The
board includes input and output SMA coaxial connectors and
75 Ω-controlled impedance signal traces. Power (2.5 V to 3.6 V)
is applied to the red V+ loop connector, and ground is connected
to the black GND loop connector.
The output signal can be configured for dc coupling or ac
coupling. When ac-coupled, two options are available: the
standard single capacitor configuration (minimum of 220 µF)
and the SAG-corrected configuration, using two smaller
capacitors (47 µF and 22 µF).
Jumper Block J2 allows the load detect feature to be evaluated
without connecting an external video load. Connecting a
jumper from the center pin to the 75 position applies a 75 Ω
load to the output and causes the LDO pin to go high.
Data Sheet
Connecting the center pin to the GND position short circuits
the output, causing the ADA4431-1 to power down, and the
LDO pin to go low. If an external video load is connected to
the OUT connector, the jumper should be removed. With the
jumper removed, disconnecting the external load also causes
the ADA4431-1 to power down.
Jumper Block J4 exercises the disable pin (DIS). When a jumper
is connected from the center pin to V+, the charge pump is
enabled. Connecting the center pin to GND forces the ADA4431-1
into low power mode. With the jumper removed, the ADA4431-1
is enabled but the charge pump is disabled.
A schematic of the ADA4431-1 evaluation board, with output
coupling options, is shown in Figure 17. Figure 18 and Figure 19
show the front and back layout of the evaluation board.
R6
75Ω
J2
OUTPUT OPTION 1
C5
0Ω
C6
220µF
C4
0Ω
AC-COUPLED
14 13 OUTPUT
V+
C9
0.1µF
16 15
R5
75Ω
C5 C6
0Ω 0Ω
C4
0Ω
DC-COUPLED
14 13 OUTPUT
75Ω
GND
LD2
OUT
GND
IN
R2
75Ω
DIS
R3
DNI
J4
GND
DIS
V+
C8 +
10µF
R1
0Ω
R4
DNI
1 +VS
2 IN
3 DIS
4 LDO
GND 12
SUBS 11
ADA4431-1 +VS 10
CAP1 9
56 78
LDOUT
C1
0.1µF
C2
0.1µF
LDO
C3
1.0µF
C7
0.1µF
SUBS
V+
OUTPUT OPTION 2
C5
47µF
C6
0Ω
C4
22µF
14 13
AC-COUPLED OUTPUT
WITH SAG CORRECTION
V+
Figure 17. Evaluation Board Schematic
Rev. A | Page 10 of 12
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet ADA4431-1.PDF ] | |
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