MAX9680EVKIT+

19-4950; Rev 0; 9/09 MAX9680 Evaluation Kit Features The MAX9680 evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board that evaluates the MAX9680 IC. The MAX9680 is optimized for 3V portable video applications and is specifically designed to be compatible with video encoders embedded in application processors with a 0.4VP-P video output. The EV kit operates from a 2.7V to 3.6V single power supply. S Single 2.7V to 3.6V Supply Operation The MAX9680 provides an internal fixed gain of 5.2V/V and has an internal 2-pole reconstruction filter that typically has bandwidth (-3dB) of 9MHz and -18dB attenuation at 27MHz. The MAX9680 EV kit accepts a 0.4VP-P input full-scale video signal and provides an output fullscale video signal of 2VP-P (nominal). S Lead(Pb)-Free and RoHS Compliant S Internal Preset Gain of 5.2V/V S Input Range Includes Ground S DC-Coupled Inputs and Outputs S Enable Input S Fully Assembled and Tested Ordering Information PART TYPE MAX9680EVKIT+ EV Kit +Denotes lead(Pb)-free and RoHS compliant. Component List DESIGNATION C1 C2 IN, OUT QTY 1 1 2 DESCRIPTION 0.1FF Q10%, 50V X7R ceramic capacitor (0603) Murata GRM188R71H104K TDK C1608X7R1H104K DESIGNATION QTY JU1, JU2 2 3-pin headers JU3, JU4 2 2-pin headers R1 1 75I Q1% resistor (0603) R2, R3, R4 0 Not installed, resistors (0603) U1 1 Single-channel video-filter amplifier (6 SC70) Maxim MAX9680AXT+ — 1 PCB: MAX9680 EVALUATION KIT+ 10FF Q20%, 6.3V X7R ceramic capacitor (0805) Murata GRM21BR70J106K TDK C2012X7R0J106K DESCRIPTION 75I BNC PCB vertical-mount connectors Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com TDK Corp. 847-803-6100 www.component.tdk.com Note: Indicate that you are using the MAX9680 when contacting these component suppliers. ________________________________________________________________ Maxim Integrated Products   1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. Evaluates: MAX9680 General Description Evaluates: MAX9680 MAX9680 Evaluation Kit Quick Start Recommended Equipment • 2.7V to 3.6V, 500mA DC power supply (VDD) Video input and output signals from the EV kit are DC-coupled. The input of the EV kit can be directly connected to the output of a video-current DAC and the EV kit’s output has a 75I back-termination resistor. • Video signal generator • Video-measurement equipment (e.g., Tektronix VM-700T) Procedure The MAX9680 EV kit is fully assembled and tested. Follow the steps below to verify board operation. Caution: Do not turn on the power supply until all connections are completed. 1) Connect the power-supply ground to the GND pad on the EV kit. 2) Connect the 2.7V to 3.6V supply to the VDD pad on the EV kit. 3) Connect the output of the video signal generator to the IN BNC connector on the EV kit. The video signal must be approximately 0 to 0.4V. 4) Connect the OUT BNC connector on the EV kit to the input of the video measurement equipment. Enable Input The MAX9680 EV kit incorporates jumper JU1 to control the enable input. When the enable input is set high, the device is enabled. When the enable input is set low, the device enters a low-power shutdown mode. See Table 1 for Jumper JU1 settings. Short-Circuit Protection The MAX9680 EV kit circuit includes a 75I backtermination resistor that limits short-circuit current when an external short is applied to the video output. Jumper JU3 is provided to apply an external short to GND at the output to test this current-limiting feature. The MAX9680 also features an internal output shortcircuit protection to prevent device damage in prototyping and applications where the amplifier output can be directly shorted to ground. Jumper JU2 is provided to test the internal output short-circuit protection. Input Considerations 8) Turn on the power supply and enable the video signal generator. The MAX9680 input is DC-coupled. When the supply voltage is between 2.7V and 3.6V, the input-voltage range extends from ground to 0.445V. When the supply voltage is between 2.8V and 3.6V, the inputvoltage range extends from ground to 0.464V. A typical current-output DAC that operates from a single supply usually creates a composite video signal with a sync tip very close to ground. Hence, the DAC output can be directly connected to the MAX9680 input. 9) Analyze the video output signal with the VM-700T video-measurement equipment. Input termination resistor R2 is provided, if necessary. Jumper JU4 is provided to set the input to GND. 5) Verify that a shunt is installed across pins 1-2 of jumper JU1 (enabled). 6) Verify that a shunt is not installed across jumpers JU2, JU3, and JU4. 7) Set the video signal generator for the desired video input signal. Detailed Description of Hardware The MAX9680 EV kit is a fully assembled and tested surface-mount circuit board that evaluates the MAX9680 IC. The MAX9680 is optimized for 3V portable video applications and has an internal 2-pole 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 has a bandwidth (-3dB) of 9MHz and -18dB attenuation at 27MHz. The MAX9680 provides an internal fixed gain of 5.2V/V. The MAX9680 EV kit accepts a 0.4VP-P input full-scale video signal and provides an output full-scale video signal of 2VP-P (nominal). Output Consideration The MAX9680 EV kit connects directly to the video cable through a 75I series back-termination resistor. The other end of the cable should be properly terminated with a 75I resistor as well. Because of this configuration, the peak-to-peak amplitude, as well as the DC level of the signal, is divided by two. The MAX9680 output signal is level-shifted up so the sync tip is approximately 130mV. Table 1. Jumper JU1 Settings SHUNT POSITION 1-2* 2-3 *Default position. ENABLE PIN OUTPUT Connected to VDD Enabled Connected to GND Disabled 2   _______________________________________________________________________________________ MAX9680 Evaluation Kit 1 JU4 VDD JU1 IN VDD 6 VDD R2 OPEN C1 U1 MAX9680 1 2 5 ENABLE C2 0.1uF GND 2 GND 3 VDIG VDD 1 RSET 10uF 3 RSET OUT JU2 4 R1 75 1% R3 OUT BNC OPEN 2 3 JU3 R4 OPEN TV_DETECT Figure 1. MAX9680 EV Kit Schematic _______________________________________________________________________________________   3 Evaluates: MAX9680 VDD IN BNC Evaluates: MAX9680 MAX9680 Evaluation Kit 1.0” 1.0” Figure 2. MAX9680 EV Kit Component Placement Guide— Component Side Figure 3. MAX9680 EV Kit PCB Layout—Component Side 1.0” Figure 4. MAX9680 EV Kit PCB Layout—Solder Side Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 4 ©  2009 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.