PMB2341 Просмотр технического описания (PDF) - Infineon Technologies

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PMB2341

10-pin Single PLL

Infineon Technologies 

Confidential

PMB 2341

preliminary

Functional Description

RI

fR (RI:R)

LO

fV (LO:M)

P-Channel

CP

Tri-State.

N-Channel

positive Polarity

CP P-Channel

Tri-State.

N-Channel

negative Polarity

Frequency fV < fR

fV lagging

Frequency fV > fR

fV leading

Frequency fV = fR

lock state

Figure 3-3 Frequency detector output waveforms

Frequency setting / divider ratio calculation:

The frequency of an external VCO controlled by the PMB 2341 is given below:

with .

fVCO:

fRI:

N:

A:

P:

R:

M=P*N+A:

fVCO

=

[

(

P

⋅

N

)

+

A

]

⋅

-f--R---I

R

=

M----

R

⋅

fRI

frequency of the external VCO

reference frequency

divide ratio of the N-counter

divide ratio of the A-swallow counter

divide ratio of the prescaler (33 in case of 32/33 prescaler selected)

divide ratio of the R-counter

total divide ratio

Note:

for continuous frequency steps following condition is necessary

[P ⋅ N + A] ≥ P ⋅ (P – 1)

Further restrictions have to be fullfilled:

A<P

A≤N

Wireless Components

3-5

Specification, February 2000

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