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ML12210 датащи(PDF) 5 Page - LANSDALE Semiconductor Inc. |
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ML12210 датащи(HTML) 5 Page - LANSDALE Semiconductor Inc. |
5 / 11 page www.lansdale.com Page 5 of 11 Issue A LANSDALE Semiconductor, Inc. ML12210 PROGRAMMABLE DIVIDER 19–bit serial data format for the programmable divider is shown below. If the control bit is LOW, data is transferred from the 18–bit shift register into the 18–bit latch which specifies the swallow A–counter divide ratio (0 to 127) and the programmable N–counter divide ratio (16 to 2047). An N–counter divide ratio less than 16 is prohibited. For Control bit (C) = LOW: SETTING BITS FOR DIVIDE RATIO OF SWALLOW A–COUNTER C A 1 A 2 A 3 A 4 A 5 A 6 A 7 N 8 N 9 N 10 N 11 N 12 N 13 N 14 N 15 LSB MSB (FIRST BIT) CONTROL BIT (LAST BIT) N 16 N 17 N 18 SETTING BITS FOR DIVIDE RATIO OF PROGRAMMABLE N–COUNTER DIVIDE RATIO OF PROGRAMMABLE N–COUNTER DIVIDE RATIO OF SWALLOW A–COUNTER Divide Ratio N N 18 N 17 N 16 N 15 N 14 N 13 N 12 N 11 N 10 N 9 N 8 Divide Ratio A A 7 A 6 A 5 A 4 A 3 A 2 A 1 16 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 17 0 0 0 0 0 0 1 0 0 0 1 1 0 0 0 0 0 0 1 • • • • • • • • • • • • • • • • • • • • 2047 1 1 1 1 1 1 1 1 1 1 1 127 1 1 1 1 1 1 1 DIVIDE RATIO SETTING fvco = [(P • N)+A] • fosc ÷ R with A<N fvco: Output frequency of external voltage controlled oscillator (VCO) N: Preset divide ratio of binary 11–bit programmable counter (16 to 2047) A: Preset divide ratio of binary 7–bit swallow counter (0 to 127, A<N) fosc: Output frequency of the external frequency oscillator R: Preset divide ratio of binary 14–bit programmable reference counter (8 to 16383) P: Preset mode of dual modulus prescaler (32 or 64) Figure 2. Serial Data Input Timing N18:MSB N17 (SW:MSB) (R14) N8 A7 (R7) (R6) A1 C = CONTROL BIT (LAST BIT) (R1) (C = CONTROL BIT (LAST BIT)) ts(D) th(D) tCW ts(C→LE) tEW DATA CLK LE NOTES: Programmable reference divider data shown in parenthesis. Data shifted into register on rising edge of CLK. ts(D) = Setup Time DATA to CLK ts(D) ≥ 10 ns th(D) = Hold Time DATA to CLK th(D) ≥ 20 ns tCW = CLK Pulse Width tCW ≥ 30 ns tEW = LE Pulse Width tEW ≥ 20 ns ts(C→LE) = Setup Time CLK to LE ts(C→LE) ≥ 30 ns |
Аналогичный номер детали - ML12210_08 |
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Аналогичное описание - ML12210_08 |
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