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ADA4411-3ARQZ Arkusz danych(PDF) 10 Page - Analog Devices

Numer części ADA4411-3ARQZ
Szczegółowy opis  Integrated Triple Video Filter and Buffer with Selectable Cutoff Frequencies and Multiplexed Inputs for RGB, HD/SD
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Strona internetowa  http://www.analog.com
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ADA4411-3ARQZ Arkusz danych(HTML) 10 Page - Analog Devices

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ADA4411-3
Rev. 0 | Page 10 of 16
THEORY OF OPERATION
The ADA4411-3 is an integrated video filtering and driving
solution that offers variable bandwidth to meet the needs of a
number of different video resolutions. There are three filters,
targeted for use with component video signals. The filters
have selectable bandwidths that correspond to the popular
component video standards. Each filter has a sixth-order
Butterworth response that includes group delay optimization.
The group delay variation from 1 MHz to 36 MHz in the
36 MHz section is 7 ns, which produces a fast settling pulse
response.
The ADA4411-3 is designed to operate in many video
environments. The supply range is 5 V to 12 V, single supply or
dual supply, and requires a relatively low nominal quiescent
current of 15 mA per channel. In single-supply applications,
the PSRR is greater than 60 dB, providing excellent rejection
in systems with supplies that are noisy or under-regulated. In
applications where power consumption is critical, the part
can be powered down to draw typically 15 μA by pulling the
DISABLE pin to the most positive rail. The ADA4411-3 is also
well-suited for high encoding frequency applications because it
maintains a stop-band attenuation of more than 40 dB to 400 MHz.
The ADA4411-3 is intended to take dc-coupled inputs
from an encoder or other ground referenced video signals.
The ADA4411-3 input is high impedance. No minimum or
maximum input termination is required, though input
terminations above 1 kΩ can degrade crosstalk performance
at high frequencies. No clamping is provided internally. For
applications where dc restoration is required, dual supplies
work best. Using a termination resistance of less than a few
hundred ohms to ground on the inputs and suitably adjusting
the level-shifting circuitry provides precise placement of the
output voltage.
For single-supply applications (VS− = GND), the input voltage
range extends from 100 mV below ground to within 2.0 V of
the most positive supply. Each filter section has a 2:1 input
multiplexer that includes level-shifting circuitry. The level-
shifting circuitry adds a dc component to ground-referenced
input signals so that they can be reproduced accurately without
the output buffers hitting the negative rail. Because the filters
have negative rail input and rail-to-rail output, dc level shifting
is generally not necessary, unless accuracy greater than that of
the saturated output of the driver is required at the most
negative edge. This varies with load but is typically 100 mV
in a dc-coupled, single-supply application. If ac coupling is
used, the saturated output level is higher because the drivers
have to sink more current on the low side. If dual supplies are
used (VS− < GND), no level shifting is required. In dual-supply
applications, the level-shifting circuitry can be used to take a
ground referenced signal and put the blanking level at ground
while the sync level is below ground.
The output drivers on the ADA4411-3 have rail-to-rail output
capabilities. They provide either 6 dB or 12 dB of gain with
respect to the ground pins. Gain is controlled by the external
gain select pin. Each output is capable of driving two ac- or dc-
coupled 75 Ω source-terminated loads. If a large dc output level
is required while driving two loads, ac coupling should be used
to limit the power dissipation.
Input MUX isolation is primarily a function of the source
resistance driving into the ADA4411-3. Higher resistances
result in lower isolation over frequency, while a low source
resistance, such as 75 Ω, has the best isolation performance.
See Figure 14 for the MUX isolation performance.


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