DEMO MANUAL DC2767A LTC6754 High Speed Comparator with LVDS DESCRIPTION Demonstration circuit 2767A features the LTC(R)6754 highspeed rail-to-rail comparator in a QFN package with LVDS compatible outputs. The DC2767 input is AC-coupled for single-ended signal greater than 5MHz and up to 445MHz. The DC2767 outputs are AC-coupled 50 source impedance for driving directly the 50 inputs of a 1GHz or higher oscilloscope. The DC2767 has a supply connection for the LTC6754 rail-to-rail inputs and a separate supply connection for the QFN LTC6754 LVDS outputs. to set the hysteresis from 0mV (off) up to 40mV. The QFN version also features output latching to provide the ability to capture the state of the comparator. The DC2767 provides a connection to set the hysteresis or for output latching. The LTC6754 includes 4.5mV of hysteresis to minimize instability. For the QFN package, a separate pin is available All registered trademarks and trademarks are the property of their respective owners. PERFORMANCE SUMMARY LE/HYST and SHDN Pins Floating. PARAMETER LTC6754 is ideally suited for high frequency line driver and clock recovery circuits. Design files for this circuit board are available. Specifications are at TA = 25C. Differential RL = 100, VOVERDRIVE = 50mV, CONDITIONS MIN TYP MAX UNITS Input Supply 2.4 5.25 V Output Supply 2.4 5.25 V VEE-0.2 VCC+0.1 V Input Voltage Range Input Offset Voltage Input Hysteresis Voltage -4 HYST Pin Floating Input Bias Current VCM = VEE + 0.3V Input Bias Current VCM = VCC - 0.3V 0.75 4 4.5 -3.8 mV mV -1.8 A 0.6 1.5 A Output Common Mode Voltage 1.18 1.26 1.31 V Differential Output Voltage 260 362 420 mV 2.4 2.9 mA Input Supply Current Output Supply Current 11 11.8 mA Propagation Delay VOVERDRIVE = 50mV 1.8 2.8 ns Toggle Rate VIN = 200mVP-P, Sine Wave 445 MHz Rev. 0 1 DEMO MANUAL DC2767A QUICK TEST SETUP Test Equipment: Dual Supply 3V-5V, 50MHz Square Wave Generator Oscilloscope 1GHz or Higher Rev. 0 2 DEMO MANUAL DC2767A TEST PROCEDURE 1. Connect a 3V supply to the input (VCCI) and output (VCCO) turrets. 4. Turn on the dual supply and the oscilloscope shows a 175mV, 50mV. 2. Connect a 50 MHz, 100mVP-P square wave to the IN+ SMA connector. Note: The DC2767 differential output is an AC-coupled 100 differential voltage source (two 50 singled-ended outputs divided by two into a 50 load). 3. Connect the OUT+ and OUT- SMAs to two channels of a 1GHz or higher oscilloscope (the oscilloscope's channel impedance must be 50). DC2767 RJ45 RECEIVER CONFIGURATION Rev. 0 3 DEMO MANUAL DC2767A DC2767 RJ45 TRANSMITTER CONFIGURATION Rev. 0 4 DEMO MANUAL DC2767A TYPICAL APPLICATION CABLE DRIVER 2.4V to 5.25V VCCI V+ 1.8V to 5V DATA SOURCE V+ +IN 750 CABLE RECEIVER 2.4V to 5.25V VCCI VCCO + Q 750 LTC6754 Q -IN +IN RJ45 CAT 6 CABLE RJ45 - 750 VEE 249 0.1F VCCO + Q 100 LTC6754 Q -IN 100 - VEE DC2767 LVDS Data Transmitter and Receiver DC2767 INPUT CONFIGURATION FOR A CMOS LOGIC DATA SOURCE Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. 5 DEMO MANUAL DC2767A ESD Caution ESD (electrostatic discharge) sensitive device. 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