MAXIM MAX11504EVKIT+

The MAX11504 evaluation kit is a fully assembled and tested SMT PCB containing the MAX11504 IC. The MAX11504 is a 4-channel video reconstruction filter and buffer for SDTV applications. The filter passband is typically 8.6MHz. The MAX11504 includes a +6dB output buffer capable of driving a 2V_p-p signal into two standard 150Ω loads. Video input and output signals on the evaluation kit can be AC-coupled or DC-coupled. The MAX11504 video inputs are terminated with 75Ω, and the outputs are terminated with 75Ω. The evaluation kit is powered by a single 5V DC supply. The MAX11504 evaluation kit can also be used to evaluate the MAX11505 IC. Free MAX11505 IC samples can be requested from the factory when ordering the MAX11504 evaluation kit. The MAX11504 filter typically provides 3dB attenuation at 8.6MHz and 50dB attenuation at 27MHz. The device includes a +6dB output buffer capable of driving a 2V_p-p video signal into two standard 150Ω loads. The MAX11504 evaluation kit has four input channels that accept composite and component video input signals. Each output of the MAX11504 evaluation kit can drive a 75Ω load to ground, which is equivalent to driving two 150Ω loads in parallel to ground. All input and output signals on the MAX11504 evaluation kit can be configured for AC or DC coupling. The evaluation kit input terminals are terminated with 75Ω, and each video output terminal is terminated with 75Ω. The MAX11504 evaluation kit can also be used to evaluate the MAX11505 IC. To evaluate the MAX11505, replace the IC (U1) with a MAX11505 IC. Refer to the MAX11505 IC datasheet for more information. The MAX11504 IC features transparent clamping at the video inputs, allowing AC or DC coupling. If the input signal remains above ground, the transparent clamp is inactive, providing true DC input coupling. If the signal falls below ground, the input must be AC-coupled. The transparent clamp sets the sync tip below ground. The MAX11504 evaluation kit provides the option to configure the MAX11504 inputs for AC or DC coupling. Jumpers JU1–JU4 are used to configure the input coupling of the MAX11504 evaluation kit. The MAX11504 evaluation kit provides the option to configure the MAX11504 outputs for AC or DC coupling. Jumpers JU12–JU16 are used to configure the output coupling of the MAX11504 evaluation kit. The MAX11504 evaluation kit provides the option to fully load the MAX11504 output channels (2, 3, and 4). Jumpers JU9, JU10, and JU11 are used to configure the output load for channel 2, channel 3, and channel 4, respectively, on the MAX11504 evaluation kit. When configuring the evaluation kit video inputs for AC-coupled operation, the correct DC bias point must be selected based on the input signal. Unipolar signals (such as R, G, B, and Y) are correctly biased using the MAX11504 internal transparent clamp. For bipolar signals (such as P_B and P_R), a constant DC bias voltage must be applied after the AC coupling capacitor to ensure the clamp never activates. A 590mV DC bias voltage can be applied by installing a jumper on jumpers JU5–JU8.

• Single 5V supply
• Output buffer drives two 150Ω standard video loads at +6dB gain
• Four standard-definition TV video filters
• AC or DC coupled inputs and outputs
• Standard 75Ω input/output termination
• Also evaluates MAX11505 (with IC swap)
• Surface-mount components
• Fully assembled and tested