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AD9945 Datasheet(PDF) 9 Page - Analog Devices |
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AD9945 Datasheet(HTML) 9 Page - Analog Devices |
9 / 16 page REV. A AD9945 –9– SERIAL INTERFACE SDATA SCK SL TEST BIT A2 0 A0 A1 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 tDS tDH tLS tLH NOTES 1. SDATA BITS ARE INTERNALLY LATCHED ON THE RISING EDGES OF SCK. 2. SYSTEM UPDATE OF LOADED REGISTERS OCCURS ON SL RISING EDGE. 3. ALL 12 DATA BITS D0 TO D11 MUST BE WRITTEN. IF THE REGISTER CONTAINS FEWER THAN 12 BITS, ZEROS SHOULD BE USED FOR THE UNDEFINED BITS. 4. TEST BIT IS FOR INTERNAL USE ONLY. MUST BE SET LOW. D11 Figure 4. Serial Write Operation SDATA A0 A1 A2 D0 D1 D2 D3 D4 D5 D10 D11 SCK SL 0 NOTES 1. MULTIPLE SEQUENTIAL REGISTERS MAY BE LOADED CONTINUOUSLY. 2. THE FIRST (LOWEST ADDRESS) REGISTER ADDRESS IS WRITTEN, FOLLOWED BY MULTIPLE 12-BIT DATA-WORDS. 3. THE ADDRESS WILL AUTOMATICALLY INCREMENT WITH EACH 12-BIT DATA-WORD (ALL 12 BITS MUST BE WRITTEN). 4. SL IS HELD LOW UNTIL THE LAST DESIRED REGISTER HAS BEEN LOADED. 5. NEW DATA IS UPDATED AT THE NEXT SL RISING EDGE. D0 D1 D10 D11 D0 ... ... ... DATA FOR STARTING REGISTER ADDRESS DATA FOR NEXT REGISTER ADDRESS D2 D1 ... ... ... ... ... ... 1 16 23 4 567 8 9 10 15 18 17 28 27 30 29 31 TEST BIT Figure 5. Continuous Serial Write Operation to All Registers |
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