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參數(shù)資料
| 型號： | PMB2349 |
| 廠商： | INFINEON TECHNOLOGIES AG |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2800 MHz, PQCC24 |
| 封裝： | PLASTIC, VQFN-24 |
| 文件頁數(shù)： | 10/35頁 |
| 文件大小： | 670K |
| 代理商： | PMB2349 |
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Functional Description
3 - 11
PMB 2349
preliminary
Wireless Components
Confidential
Specification, May 2000
3.4.6
Fast wake-up programming
When the circuit is connected to the supply voltage all registers are undefined.
Due to the fact that each counter is loading its new start value after it is decre-
mented to zero“, the start-up time of the counters with the programmed values
is too long for some applications. If the counters are programmed in standby
mode 2 and the PLLs are switched afterwards in operating mode, the counters
are starting immediatly with the programmed values. Therefore following data
transfer sequence is recommended:
3.4.7
Phase Detector Outputs
The timing diagram is valid for PLL1 and PLL2.
Table 3-2 Fast Wake Up Data Transfer Sequence
Step
Serial Data Transfer Sequence
1
Long Control Word: Asynchronous Mode, Standby2
2
R-Counter
3
A-/N-Counter
4
Long Control Word: Synchronous Mode, Operating Mode
RI
CP
LD
(RI:R)
(RF1:M)
positive Polarity
N-Channel
Frequency fV > fR
fV leading
Frequency fV = fR
lock state
Frequency fV < fR
fV lagging
fR
fV
RF1/2
(RF2:M)
negative Polarity
P-Channel
Tri-State
N-Channel
P-Channel
Tri-State
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