The MAX9508 video filter amplifier with SmartSleep and bidirectional video support is ideal for set-top boxes (STBs), portable DVD players, and portable media players (PMPs). The inputs can be directly connected to the digital-to-analog converter (DAC) outputs. The reconstruction filter removes high-frequency signals above 6.75MHz. The amplifiers have 6dB of gain, and the outputs can be DC-coupled to a load of 75Ω, which is equivalent to two video loads, or it can be AC-coupled to a load of 150Ω. The SmartSleep circuitry intelligently reduces power consumption based on the presence of the input signal and the output loads. When the MAX9508 does not detect the presence of sync on the input video signal, the supply current is reduced to less than 7µA. The device only enables a video amplifier when there is an active video input signal and an attached load. The video amplifier remains on while a load is connected. If the load is disconnected, the video amplifier is turned off. The MAX9508 contains three reconstruction filters, four video amplifiers, and a pulldown switch at one of the two CVBS outputs. The MAX9508 has the ability to control the bidirectional video signals at the CVBS video connections without the need for separate switches or relays. This feature is particularly useful for portable DVD players, which often use the same connector to drive a composite video output and to accept an external video signal to display on the LCD panel.
The MAX9508 is a video filter amplifier designed for set‑top boxes, portable DVD players and portable media players. It integrates three reconstruction filters, four video amplifiers and a pulldown switch, providing bidirectional composite video handling without external switches.
The device operates from a single 2.7 V to 3.6 V supply, offers 6 dB gain, and includes the SmartSleep feature that reduces power draw to under 7 µA when no video sync is present. It is supplied in a 16‑pin TQFN (3 mm × 3 mm) package and is rated for –40 °C to +125 °C operation.
| Operating Temperature Range | -40 °C to +125 °C |
|---|---|
| Video Amplifier Gain | 6 dB |
| SmartSleep Minimum Supply Current | < 7 µA |
| Package Type | 16‑pin TQFN (3 mm × 3 mm) |
SmartSleep detects the presence of an input video sync and output load, and reduces the supply current to less than 7 µA when no sync is detected, saving power.
The MAX9508 is specified for operation from –40 °C up to +125 °C.