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AD9545 Datasheet(PDF) 41 Page - Analog Devices |
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AD9545 Datasheet(HTML) 41 Page - Analog Devices |
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41 / 157 page  Data Sheet AD9545 Rev. A | Page 41 of 157 REFERENCE DIVIDERS (R DIVIDERS) Each reference input has a dedicated divider, Rx (where x is A, AA, B, or BB). The primary purpose of the Rx dividers is to reduce the input reference frequency (assuming it is greater than 200 kHz) to a value between 1 Hz and 200 kHz to satisfy the input frequency bounds of the TDC. The user programs Rx via the 30-bit unsigned REFx R divide ratio bit fields (where x is A, AA, B, or BB) in Register 0x0400 to Register 0x0403, Register 0x0420 to Register 0x0423, Register 0x0440 to Register 0x0443, and Register 0x0460 to Register 0x0463. The divide ratio of Rx depends on the value, R, the user programs in the REFx R divide ratio bit fields. The user must program the bit field with a value one less than the desired divide ratio. Thus, the Rx dividers provide divide ratios from 1 to 1,073,741,824. For example, for an input reference frequency of 125 MHz and the desired Rx output frequency of 125 kHz, a divide ratio of 1000 is required. Thus, the required bit field value is 999 (0x000003E7 hexadecimal). |
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