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ADA4411-3 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADA4411-3
Beschreibung Integrated Triple Video Filter and Buffer
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADA4411-3 Datasheet, Funktion
www.DataSheet4U.com
Integrated Triple Video Filter and Buffer with Selectable
Cutoff Frequencies and Multiplexed Inputs for RGB, HD/SD
ADA4411-3
FEATURES
Sixth-order adjustable video filters
36 MHz, 18 MHz, and 9 MHz
Many video standards supported: RGB, YPbPr, YUV, SD, Y/C
Ideal for 720p and 1080i resolutions
−1 dB bandwidth of 30.5 MHz for HD
Low quiescent power
Only 265 mW for 3 channels on 5 V supply
Disable feature cuts supply current to 15 μA
2:1 mux on all inputs
Variable gain: ×2 or ×4
DC output offset adjust: ±0.5 V, input referred
Excellent video specifications
Wide supply range: +4.5 V to ±5 V
Rail-to-rail output
Output can swing 4.5 V p-p on single 5 V supply
Small packaging: 24-lead QSOP
APPLICATIONS
Set-top boxes
Personal video recorders
DVD players and recorders
HDTVs
Projectors
GENERAL DESCRIPTION
The ADA4411-3 is a comprehensive filtering solution designed
to give designers the flexibility to easily filter and drive various
video signals, including high definition video. Cutoff frequen-
cies of the sixth-order video filters range from 9 MHz to
36 MHz and can be selected by two logic pins to obtain four
filter combinations that are tuned for RGB, high definition, and
standard definition video signals. The ADA4411-3 has a rail-
to-rail output that can swing 4.5 V p-p on a single 5 V supply.
The ADA4411-3 offers gain and voltage offset adjustments.
With a single logic pin, the throughput filter gain can be
selected to be ×2 or ×4. Output voltage offset is continuously
adjustable over an input-referred range of ±500 mV by applying
a differential voltage to an independent offset control input.
The ADA4411-3 offers 2:1 multiplexers on all of its video
inputs, which are useful in applications where filtering is
required for multiple sources of video signals.
FUNCTIONAL BLOCK DIAGRAM
Y1/G1 IN
Y2/G2 IN
36MHz, 18MHz, 9MHz
×2
×4
Pb1/B1 IN
Pb2/B2 IN
36MHz, 18MHz, 9MHz
×2
×4
Pr1/R1 IN
Pr2/R2 IN
INPUT SELECT
LEVEL1
LEVEL2
CUTOFF SELECT
GAIN SELECT
DISABLE
2
DC
OFFSET
36MHz, 18MHz, 9MHz
×2
×4
ADA4411-3
Figure 1.
Y/G OUT
Pb/B OUT
Pr/R OUT
The ADA4411-3 can operate on a single +5 V supply as well as
on ±5 V supplies. Single-supply operation is ideal in
applications where power consumption is critical. The disable
feature allows for further power conservation by reducing the
supply current to typically 15 μA when a particular device is not
in use.
Dual-supply operation is best for applications where the
negative-going video signal excursions must swing at or
below ground while maintaining excellent video performance.
The output buffers have the ability to drive two 75 Ω doubly
terminated cables that are either dc-coupled or ac-coupled.
The ADA4411-3 is available in the 24-lead, wide body
QSOP and is rated for operation over the extended
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
© 2005 Analog Devices, Inc. All rights reserved.






ADA4411-3 Datasheet, Funktion
ADA4411-3
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
LEVEL1 1
24 LEVEL2
DISABLE 2
23 G_SEL
Y1/G1 3
22 VCC
GND 4
21 Y/G_OUT
Pb1/B1 5
GND 6
Pr1/R1 7
20 VEE
ADA4411-3
TOP VIEW 19 Pb/B_OUT
(Not to Scale) 18 VEE
F_SEL_A 8
17 Pr/R_OUT
F_SEL_B 9
16 VCC
Y2/G2 10
15 MUX
DGND 11
14 Pr2/R2
Pb2/B2 12
13 DGND
Figure 3. 24-Lead QSOP Pin Configuration
Table 5. 24-Lead QSOP Pin Function Descriptions
Pin No. Name
Description
1 LEVEL1
DC Level Adjust Pin 1
2 DISABLE
Disable/Power Down
3 Y1/G1
Channel 1 Y/G Video Input
4 GND
Signal Ground Reference
5 Pb1/B1
Channel 1 Pb/B Video Input
6 GND
Signal Ground Reference
7 Pr1/R1
Channel 1 Pr/R Video Input
8 F_SEL_A
Filter Cutoff Select Input A
9 F_SEL_B
Filter Cutoff Select Input B
10 Y2/G2
Channel 2 Y/G Video Input
11 DGND
Digital Ground Reference
12 Pb2/B2
Channel 2 Pb/B Video Input
13 DGND
Digital Ground Reference
14 Pr2/R2
Channel 2 Pr/R Video Input
15 MUX
Input Mux Select Line
16 VCC
Positive Power Supply
17 Pr/R_OUT
Pr/R Video Output
18 VEE
Negative Power Supply
19 Pb/B_OUT
Pb/B Video Output
20 VEE
Negative Power Supply
21 Y/G_OUT
Y/G Video Output
22 VCC
Positive Power Supply
23 G_SEL
Gain Select
24 LEVEL2
DC Level Adjust Pin 2
Rev. 0 | Page 6 of 16

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ADA4411-3 pdf, datenblatt
ADA4411-3
Figure 20 and Figure 21 illustrate several ways to use the
LEVEL1 and LEVEL2 inputs. Figure 20 shows examples of how
to generate fully adjustable LEVEL1 and LEVEL2 voltages from
±5 V and single +5 V supplies. These circuits show a general
case, but a more practical approach is to fix one voltage and
vary the other. Figure 21 illustrates an effective way to produce
a 600 mV output offset voltage in a single-supply application.
Although the LEVEL2 input could simply be connected to
GND, Figure 21 includes bypassed resistive voltage dividers for
each input so that the input levels can be changed, if necessary.
Additionally, many in-circuit testers require that I/O signals not
be tied directly to the supplies or GND. DNP indicates do not
populate.
DUAL SUPPLY
+5V +5V
9.53kΩ
1kΩ
9.53kΩ
LEVEL1
0.1μF
9.53kΩ
1kΩ
9.53kΩ
LEVEL2
0.1μF
–5V –5V
SINGLE SUPPLY
+5V +5V
9.09kΩ
1kΩ
LEVEL1
0.1μF
9.09kΩ
1kΩ
LEVEL2
0.1μF
Figure 20. Generating Fully Adjustable Output Offsets
+5V
10kΩ
634Ω
LEVEL1
0.1μF
+5V
DNP
0Ω
LEVEL2
DNP
Figure 21. Flexible Circuits to Set the LEVEL1 and LEVEL2 Inputs to
Obtain a 600 mV Output Offset on a Single Supply
INPUT AND OUTPUT COUPLING
Inputs to the ADA4411-3 are normally dc-coupled. Ac coupling
the inputs is not recommended; however, if ac coupling is
necessary, suitable circuitry must be provided following the ac
coupling element to provide proper dc level and bias currents at
the ADA4411-3 input stages. The ADA4411-3 outputs can be
either ac- or dc-coupled.
When driving single ac-coupled loads in standard 75 Ω video
distribution systems, 220 μF coupling capacitors are recom-
mended for use on all but the chrominance signal output. Since
the chrominance signal is a narrow-band modulated carrier, it
has no low frequency content and can therefore be coupled with
a 0.1 μF capacitor.
There are two ac coupling options when driving two loads from
one output. One simply uses the same value capacitor on the
second load, while the other is to use a common coupling
capacitor that is at least twice the value used for the single load
(see Figure 22 and Figure 23).
ADA4411-3
75Ω
75Ω 220μF CABLE
75Ω
75Ω 220μF CABLE
75Ω
75Ω
Figure 22. Driving Two AC-Coupled Loads with Two Coupling Capacitors
ADA4411-3
470μF
75Ω
75Ω CABLE
75Ω
75Ω CABLE
75Ω
75Ω
Figure 23. Driving Two AC-Coupled Loads with One Common Coupling Capacitor
When driving two parallel 150 Ω loads (75 Ω effective load),
the 3 dB bandwidth of the filters typically varies from that of
the filters with a single 150 Ω load. For the 9 MHz and 18 MHz
filters, the typical variation is within ±1.0%; for the 36 MHz
filters, the typical variation is within ±2.5%.
Rev. 0 | Page 12 of 16

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