DirectDrive Video Amplifier - Maxim Integrated Products
Description
19-4431; Rev 0; 2/09
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DirectDrive Video Amplifier with Short-to-Battery Protection
General Description Features
♦ Short-to-Battery Protection on Video Output (Up to 18V) ♦ DirectDrive Sets Video Output Black Level Near Ground ♦ DirectDrive Eliminates DC-Blocking Capacitors at the Output ♦ 3.
3V Single-Supply Operation ♦ Reconstruction Filter with 9.
5MHz Passband and 42dB Attenuation at 27MHz ♦ DC-Coupled Input/Output ♦ Transparent Input Sync-Tip Clamp ♦ 4V/V Internal Fixed Gain
MAX9532
The MAX9532 DirectDrive ® video filter amplifier is specifically designed to work in harsh environments such as automobiles.
The MAX9532 provides integrated short-to-battery protection, allowing the output of the device to survive shorts up to 18V.
Maxim’s DirectDrive technology eliminates large output coupling capacitors and sets the output video black level near ground.
DirectDrive requires an integrated charge pump and an internal linear regulator to create a clean negative power supply so that the amplifier can pull the sync below ground.
The charge pump injects so little noise into the video output that the picture is visibly flawless.
The MAX9532 features an internal reconstruction filter that smoothes the steps and reduces the spikes on the video signal from the video digital-to-analog converter (DAC).
The reconstruction filter typically provides ±1dB passband flatness of 9.
5MHz and 42dB attenuation at 27MHz.
The input of the MAX9532 can be directly connected to the output of a video DAC.
The MAX9532 also features a transparent input sync-tip clamp, allowing AC-coupling of input signals with different DC biases.
The MAX9532 features an internal fixed gain of 4V/V.
The input full-scale video signal is nominally 0.
5VP-P, and the output full-scale video signal is nominally 2VP-P.
The short-to-battery protection utilizes an internal switch in series with the amplifier output.
When the MAX9532 detects that the output is short circui...
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