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ADA4411-3ARQZ Arkusz danych(PDF) 10 Page - Analog Devices |
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ADA4411-3ARQZ Arkusz danych(HTML) 10 Page - Analog Devices |
10 / 16 page 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. |
Podobny numer części - ADA4411-3ARQZ |
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Podobny opis - ADA4411-3ARQZ |
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