ADA4420-6ARQZ

Overview

The ADA4420-6ARQZ is a low-cost, six-channel video reconstruction filter designed for consumer applications. It integrates three independent sixth-order Butterworth filters/buffers for standard definition (Y/C or CVBS) and three for high definition component signals (YPrPb or RGB). Operating from a single 5 V supply with a typical quiescent current of 32 mA, the device features rail-to-rail outputs with 6 dB gain and a built-in 250 mV DC offset for direct DC coupling. The HD channels provide a typical -1 dB bandwidth of 26 MHz, while SD channels offer approximately 8.6 MHz. Each output can drive two 75 Ω doubly terminated cables.

Feature Summary

• Six independent sixth-order Butterworth filters providing dedicated processing for both standard definition and high definition video signals.
• Transparent input sync tip clamp allows AC coupling of inputs without requiring external DC restoration circuitry.
• Rail-to-rail output drivers with 6 dB gain and a fixed 250 mV DC offset enable direct DC coupling to downstream stages.
• Integrated disable feature reduces supply current to less than 8 μA when the device is not in use.

Applications

• Set-top boxes
• DVD players and recorders
• HDTVs
• Projectors
• Personal video recorders

Procurement Notes

Verify the specific package option against the ordering guide. The ARQZ suffix denotes the 16-lead QSOP package, while ARUZ indicates the 20-lead TSSOP. Confirm RoHS compliance status as indicated by the Z suffix. Ensure the operating temperature range matches the application requirements, as this variant supports extended industrial temperatures from -40°C to +85°C.

Selection Notes

Select this component for designs requiring simultaneous filtering of multiple SD and HD video streams within a single IC. The high impedance inputs offer flexibility in terminating DAC outputs, while the ability to drive dual 75 Ω loads per channel simplifies board layout by eliminating separate output buffers. Consider the power consumption constraints, as the active mode draws 32 mA, though the disable pin can significantly reduce standby power.

Part Context

The ADA4420-6 belongs to Analog Devices' family of low-cost video reconstruction filters. It is specifically engineered to replace discrete filter solutions in consumer electronics, offering integrated buffering and filtering for both SD and HD formats. The device complements video encoders and decoders by providing clean signal reconstruction at the analog output stage.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How does the ADA4420-6 handle input coupling?

Inputs can be either AC-coupled or DC-coupled. For AC-coupled inputs, the transparent sync tip clamp ensures the lowest point of the signal is clamped to approximately 0 V, eliminating the need for DC restoration.

What is the function of the DIS pin?

The DIS pin controls the disable/Power-Down feature. Pulling this pin low disables the device, reducing the typical supply current to 7 μA for power conservation when the device is not in use.

Can the outputs drive multiple loads simultaneously?

Yes, each output driver is capable of driving two 75 Ω doubly terminated cables. When driving two parallel 150 Ω loads, the 3 dB bandwidth may vary slightly compared to a single 150 Ω load.