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9702-00 Datasheet(PDF) 9 Page - Peregrine Semiconductor Corp. |
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9702-00 Datasheet(HTML) 9 Page - Peregrine Semiconductor Corp. |
9 / 14 page PE9702 Advance Information PEREGRINE SEMICONDUCTOR CORP. | http://www.peregrine-semi.com Copyright Peregrine Semiconductor Corp. 2003 Page 9 of 15 Main Counter Chain Normal Operating Mode The main counter chain divides the RF input frequency, Fin, by an integer derived from the user- defined values in the “M” and “A” counters. It is composed of the 10/11 dual modulus prescaler, modulus select logic, and 9-bit M counter. Setting Pre_en “low” enables the 10/11 prescaler. Setting Pre_en “high” allows Fin to bypass the prescaler and powers down the prescaler. The output from the main counter chain, fp, is related to the VCO frequency, Fin, by the following equation: fp = Fin / [10 x (M + 1) + A] (1) where A ≤ M + 1, 1 ≤ M ≤ 511 When the loop is locked, Fin is related to the reference frequency, fr, by the following equation: Fin = [10 x (M + 1) + A] x (fr / (R+1)) (2) where A ≤ M + 1, 1 ≤ M ≤ 511 A consequence of the upper limit on A is that Fin must be greater than or equal to 90 x (fr / (R+1)) to obtain contiguous channels. Programming the M Counter with the minimum value of “1” will result in a minimum M Counter divide ratio of “2”. In Direct Interface Mode, main counter inputs M7 and M8 are internally forced low. In this mode, the M value is limited to 1 ≤ M ≤ 127. Prescaler Bypass Mode Setting Pre_en “high” allows Fin to bypass and power down the prescaler. In this mode, the 10/11 prescaler and A register are not active, and the input VCO frequency is divided by the M counter directly. The following equation relates Fin to the reference frequency, fr: Fin = (M + 1) x (fr / (R+1)) ) (3) where 1 ≤ M ≤ 511 In Direct Interface Mode, main counter inputs M7 and M8 are internally forced low. In this mode, the M value is limited to 1 ≤ M ≤ 127. Reference Counter The reference counter chain divides the reference frequency, fr, down to the phase detector comparison frequency, fc. The output frequency of the 6-bit R Counter is related to the reference frequency by the following equation: fc = fr / (R + 1) (4) where 0 ≤ R ≤ 63 Note that programming R with “0” will pass the reference frequency, fr, directly to the phase detector. In Direct Interface Mode, R Counter inputs R4 and R5 are internally forced low (“0”). In this mode, the R value is limited to 0 ≤ R ≤ 15. Register Programming Parallel Interface Mode Parallel Interface Mode is selected by setting the Bmode input “low” and the Smode input “low”. Parallel input data, D[7:0], are latched in a parallel fashion into one of three 8-bit primary register sections on the rising edge of M1_WR, M2_WR, or A_WR per the mapping shown in Table 7 on page 10. The contents of the primary register are transferred into a secondary register on the rising edge of Hop_WR according to the timing diagram shown in Figure 5. Data is transferred to the counters as shown in Table 7 on page 10. The secondary register acts as a buffer to allow rapid changes to the VCO frequency. This double buffering for “ping-pong” counter control is programmed via the FSELP input. When FSELP is “high”, the primary register contents set the counter inputs. When FSELP is “low”, the secondary register contents are utilized. Parallel input data, D[7:0], are latched into the enhancement register on the rising edge of E_WR according to the timing diagram shown in Figure 4. This data provides control bits as shown in Table 8 on page 10 with bit functionality enabled by asserting the Enh input “low”. |
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