DEMO MANUAL DC1075B Clock Divider/Sine Wave 50 to CMOS Level Converter DESCRIPTION Demonstration circuit 1075B is a divide by 2/4/8 clock of this re-timing stage is a CMOS signal suitable to be a divider for use with high speed ADCs. Each assembly clock source for high speed ADCs. includes a clock divider followed by a re-timing stage used This circuit also is a model for designs involving FPGAs to produce sharp clock edges. Functionally, the DC1075B which serve as clock dividers. Whenever this is done, a D receives a high frequency sine wave which is attenuated flip flop re-timing stage is required to ensure a low jitter and routed into the clock divider. The output of the clock clock signal. divider is then routed to a D flip flop re-timing stage. This Design files for this circuit board are available. D flip flop is clocked by the original high frequency sine All registered trademarks and trademarks are the property of their respective owners. wave. This is critical to ensure signal integrity. The output BOARD PHOTO Figure1. DC1075B Connection Diagram 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 1 subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.DEMO MANUAL DC1075B QUICK START PROCEDURE Setup of the input signal and terminate the divided clock output signal with 50. The DC1075B requires an external sine wave input source and an external power supply above 3.3V. The input volt- Table1. DC1075B Assembly Options age should not exceed 6.5V. Connect the female SMA MAX INPUT U1 DIVIDE BY FREQ (MHz) connector to the sine wave generator. The input signal DC1075B-A HMC433E 4 1100* level should not exceed 13.0dBm. The DC1075B uses DC1075B-B HMC432E 2 500 a male SMA output connector that can be connected DC1075B-C HMC434E 8 1300 directly to the clock input of ADC demo boards without additional adaptors. *Input frequencies for the DC1075B-A from 540MHz to 700MHz are not recommended. For best results put a bandpass filter between the sine wave input source and the DC1075B to reduce the jitter ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. 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