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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)： | 9/35頁 |
| 文件大?。?/td> | 670K |
| 代理商： | PMB2349 |
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Functional Description
3 - 10
PMB 2349
preliminary
Wireless Components
Confidential
Specification, May 2000
3.4.3
Standby Condition (power down)
Each PLL of the PMB 2349 has two programmable standby modes to reduce
the current consumption (standby 1, standby 2).
Standby 1:
The corresponding PLL is switched off, the current consumption
is reduced below 1
A.
Standby 2:
The corresponding counters, the charge pump and the outputs
are switched off. Only the preamplifier of RI-input stays active.
(See standby table)
3.4.4
Divide ratio programming
The frequency of an external VCO controlled by the PMB 2347 is given below:
with
.
fVCO:
frequency of the external VCO
fRI:
reference frequency
N:
divide ratio of the N-counter
A:
divide ratio of the A-swallow counter
P:
divide ratio of the prescaler
R:
divide ratio of the R-counter
M=P*N+A:
total divide ratio
Note:
for continous frequency steps following condition is necessary
3.4.5
Prescaler Divide Ratio
For the highest input frequencies of the prescalers the larger divide ratio is nec-
essary:
RF-PLL:
64/65 for frequencies greater 1500 MHz
IF-PLL:
16/17 for frequencies greater 375 MHz
f
VC O
PN
() A
+
[]
f
RI
R
-------
M
R
-----f
RI
==
AN
≤
PN
A
+
[] PP 1
–
()
≥
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