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3D7503-40 Datasheet(PDF) 2 Page - Data Delay Devices, Inc. |
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3D7503-40 Datasheet(HTML) 2 Page - Data Delay Devices, Inc. |
2 / 5 page 3D7503 Doc #98009 DATA DELAY DEVICES, INC. 2 12/11/98 Tel: 973-773-2299 Fax: 973-773-9672 http://www.datadelay.com TABLE 1: PART NUMBER SPECIFICATIONS PART DECODER BAUD RATE (MBaud) NUMBER Nominal Minimum Maximum 3D7503-5 5.00 4.25 5.75 3D7503-10 10.00 8.50 11.50 3D7503-20 20.00 17.00 23.00 3D7503-25 25.00 21.25 28.75 3D7503-30 30.00 25.50 34.50 3D7503-40 40.00 34.00 46.00 3D7503-50 50.00 42.50 57.50 NOTE: Any baud rate between 5 and 50 MBaud not shown is also available at no extra cost. APPLICATION NOTES ENCODER The Manchester encoder subsystem samples the data input at the rising edge of the input clock. The sampled data is used in conjunction with the clock rising and falling edges to generate the by- phase level Manchester code. The encoder employs the timing of the clock rising and falling edges (duty cycle) to implement the required coding scheme, as shown in Figure 1. To reduce the difference between the output data high time and low time, it is essential that the deviation of the input clock duty cycle from 50/50 be minimized. The encoder presents at its outputs the true and the complimented encoded data. The High-to- Low time skew of the selected data output should be budgeted by the user, as it relates to his application, to satisfactorily estimate the distortion of the transmitted data stream. Such an estimate is very useful in determining the functionality and margins of the data link, if a Manchester decoder is used to decode the received data. RESET (RESB) CLOCK (CIN) DATA (DIN) TRANSMIT (TX) TRANSMIT (TXB) tDS tDH Figure 1: Timing Diagram (Encoder) 1/fC 1 0 1 1 0 0 1 0 1 0 1 1 0 0 1 0 (Left high for normal operation) T2H T2L T1H T1L |
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