Application Solution | The D1675 single-channel 6-order high-definition video filter driver circuit can reduce parasitic capacitance and noise.

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Application Solution | The D1675 single-channel 6-order high-definition video filter driver circuit can reduce parasitic capacitance and noise. [Copy link]

1 Overview:

The D1675 single power supply operates at +2.5V to +5V and is a filter and buffer for decoding and encoding high-definition video signals. Compared with traditional designs using discrete components, the D1675 can save PCB board area, reduce costs and improve video signal performance. The D1675 integrates a DC-coupled input buffer, a video encoder that eliminates out-of-band noise, and an op amp driver with a gain of +6dB that can drive a 75Ω load. The AC or DC-coupled input buffer eliminates synchronous squeezing, bending, and field tilt. The output of the D1675 can also be DC-coupled or AC-coupled.

2. The typical application line diagram is as follows:

A) The line is as follows:

B) The test waveform is as follows (power supply VCC = 3.3V, 1MHz video input):

3. Practical application (power bypass and PCB board)

Proper power supply bypassing is very important for optimizing video performance in design. D1675 uses a 0.1μF and a 10μF capacitor to bypass the power pins. These two capacitors should be as close to the power pins of D1675 as possible. To ensure the best performance, the PCB ground line should be as wide as possible. The input and output resistors should be as close to the relevant pins of D1675 as possible to avoid performance degradation. There is a 75Ω resistor on the PCB trace at the output end to match the 75Ω impedance of the cable. In PCB design, try to make the D1675 input and output traces as short as possible to reduce parasitic capacitance and noise.