DC2767A Analog Devices

DEMO MANUAL DC2767A LTC6754 High Speed Comparator with LVDS DESCRIPTION Demonstration circuit 2767A features the LTC 6754 high- to set the hysteresis from 0mV (off) up to 40mV. The speed rail-to-rail comparator in a QFN package with LVDS QFN version also features output latching to provide the compatible outputs. The DC2767 input is AC-coupled for ability to capture the state of the comparator. The DC2767 single-ended signal greater than 5MHz and up to 445MHz. provides a connection to set the hysteresis or for output The DC2767 outputs are AC-coupled 50 source imped- latching. ance for driving directly the 50 inputs of a 1GHz or LTC6754 is ideally suited for high frequency line driver higher oscilloscope. The DC2767 has a supply connection and clock recovery circuits. for the LTC6754 rail-to-rail inputs and a separate supply Design files for this circuit board are available. connection for the QFN LTC6754 LVDS outputs. All registered trademarks and trademarks are the property of their respective owners. The LTC6754 includes 4.5mV of hysteresis to minimize instability. For the QFN package, a separate pin is available Specifications are at T = 25C. Differential R = 100, V = 50mV, PERFORMANCE SUMMARY A L OVERDRIVE LE/HYST and SHDN Pins Floating. PARAMETER CONDITIONS MIN TYP MAX UNITS Input Supply 2.4 5.25 V Output Supply 2.4 5.25 V Input Voltage Range V 0.2 V +0.1 V EE CC Input Offset Voltage 4 0.75 4 mV Input Hysteresis Voltage HYST Pin Floating 4.5 mV Input Bias Current V = V + 0.3V 3.8 1.8 A CM EE Input Bias Current V = V 0.3V 0.6 1.5 A CM CC Output Common Mode Voltage 1.18 1.26 1.31 V Differential Output Voltage 260 362 420 mV Input Supply Current 2.4 2.9 mA Output Supply Current 11 11.8 mA Propagation Delay V = 50mV 1.8 2.8 ns OVERDRIVE Toggle Rate V = 200mV , Sine Wave 445 MHz IN P-P Rev. 0 1DEMO MANUAL DC2767A QUICK TEST SETUP Test Equipment: Dual Supply 3V-5V, 50MHz Square Wave Generator Oscilloscope 1GHz or Higher Rev. 0 2