Electronic Components Datasheet Search |
|
PE3239 Datasheet(PDF) 8 Page - Peregrine Semiconductor Corp. |
|
PE3239 Datasheet(HTML) 8 Page - Peregrine Semiconductor Corp. |
8 / 12 page Product Specification PE3239 Page 8 of 12 ©2006 Peregrine Semiconductor Corp. All rights reserved. Document No. 70-0047-02 │ UltraCMOS™ RFIC Solutions Main Counter Chain Normal Operating Mode Setting the Pre_en control bit “low” enables the ÷10/11 prescaler. The main counter chain then divides the RF input frequency (Fin) by an integer derived from the values in the “M” and “A” counters. In this mode, 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. The A counter can accept values as high as 15, but in typical operation it will cycle from 0 to 9 between increments in M. Programming the M counter with the minimum allowed value of “1” will result in a minimum M counter divide ratio of “2”. Prescaler Bypass Mode Setting the frequency control register bit Pre_en “high” allows Fin to bypass the ÷10/11 prescaler. In this mode, the prescaler and A counter are powered down, 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 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. Register Programming Serial Interface Mode While the E_WR input is “low” and the S_WR input is “low”, serial input data (Sdata input), B0 to B19, are clocked serially into the primary register on the rising edge of Sclk, MSB (B0) first. The contents from the primary register are transferred into the secondary register on the rising edge of either S_WR according to the timing diagrams shown in Figure 7. Data are transferred to the counters as shown in Table 7 on page 9. The double buffering provided by the primary and secondary registers allows for “ping-pong” counter control using the FSELS input. When FSELS is “high”, the primary register contents set the counter inputs. When FSELS is “low”, the secondary register contents are utilized. While the E_WR input is “high” and the S_WR input is “low”, serial input data (Sdata input), B0 to B7, are clocked serially into the enhancement register on the rising edge of Sclk, MSB (B0) first. The enhancement register is double buffered to prevent inadvertent control changes during serial loading, with buffer capture of the serially entered data performed on the falling edge of E_WR according to the timing diagram shown in Figure 7. After the falling edge of E_WR, the data provide control bits as shown in Table 8 on page 9 will have their bit functionality enabled by asserting the Enh input “low”. |
Similar Part No. - PE3239 |
|
Similar Description - PE3239 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |