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M2040-01-533.3334 Datasheet(PDF) 3 Page - Integrated Circuit Systems |
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M2040-01-533.3334 Datasheet(HTML) 3 Page - Integrated Circuit Systems |
3 / 12 page M2040 Datasheet Rev 1.0 3 of 12 Revised 28Jan2005 Integr ated Circuit Systems , Inc. ● Netw o r ki ng & C o mmun ica t io ns ● ww w. icst.com ● tel (5 08) 85 2-54 00 M2040 FREQUENCY TRANSLATION PLL WITH AUTOSWITCH Prod uct Data Sh eet Integrated Circuit Systems, Inc. DETAILED BLOCK DIAGRAM Figure 3: Detailed Block Diagram PLL DIVIDER SELECTION TABLES Mfin (Frequency Input) Divider Look-Up Table (LUT) The FIN_SEL1:0 pins select the feedback divider value (“Mfin”). M / R Divider Ratio Look-up Table (LUT) The MR_SEL pin selects the feedback and reference divider values M and R, respectively. Post-PLL Divider The M2040 also features a post-PLL (P) divider for the output clocks. It divides the VCSO frequency to produce one of two selectable output frequencies (1/2 or 1/1 of the VCSO frequency). That selected frequency appears on both clock output pairs. The P_SEL pin selects the value for the P divider. Phase Locked Loop (PLL) M2040 SAW Delay Line Phase Shifter VCSO C POST C POST VC nVC R POST nOP_OUT OP_OUT R POST R LOOP R LOOP C LOOP C LOOP OP_IN nOP_IN PLL Phase Detector Loop Filter Amplifier External Loop Filter Components MR_SEL FIN_SEL1:0 R Divider MUX 0 REF_SEL DIF_REF0 nDIF_REF0 1 Mfin Divider LUT Mfin Divider M Divider FOUT0 nFOUT0 P Divider P_SEL NBW R IN R IN M / R Divider LUT DIF_REF1 nDIF_REF1 Auto Ref Sel 0 1 LOL Phase Detector REF_ACK AUTO INIT LOL FOUT1 nFOUT1 2 FIN_SEL1:0 Mfin Value 11 1 10 4 01 8 00 32 Table 3: Mfin (Frequency Input) Divider Look-Up Table (LUT) MR_SEL M R Description 032 16 Used when Fin = 32/16 = 1/2 Fvcso (e.g., Fin=266.6667MHz, Fvcso= 533.3334MHz1) Note 1: Fvcso= Example 533.3334MHz in M2040-01-533.3334. 130 16 Used when Fin = 30/16 = 0.53334 Fvcso (e.g., Fin=284.444MHz, Fvcso= 533.3334 MHz 1) Table 4: M / R Divider Ratio Look-up Table (LUT) P_SEL P Value Example: M2040-533.3334 Output Frequency (MHz) 1 2 266.6667 0 1 533.3334 Table 5: P Divider Selector Values and Frequencies |
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