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SP8852EKGHCAR Datasheet(PDF) 6 Page - Mitel Networks Corporation

Part # SP8852EKGHCAR
Description  2쨌7GHz Parallel Load Professional Synthesiser
Download  13 Pages
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Manufacturer  MITEL [Mitel Networks Corporation]
Direct Link  http://www.mitel.com
Logo MITEL - Mitel Networks Corporation

SP8852EKGHCAR Datasheet(HTML) 6 Page - Mitel Networks Corporation

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6
SP8852E
1
5V
1k
+
144
SP8852E
7
8
9
10
11
12
13
14
15
16
17
2
3
4
5
643 42 41 40
23 24
22
21
20
19
18
25 26 27 28
39
38
37
36
35
34
33
32
31
30
29
FPD
1n
REF IN
FREF
1
5V
1
µ
10n
2·2k
100p
1
5V
1n
1n
1n
VCO
LOOP FILTER
1
30V
SP8852E
27
28
33p
100p
10MHZ
Application using
crystal reference
CONTROL
MICRO
ADDRESS
STROBE
VALUES DEPEND
ON APPLICATION
OP27
ETC
*
*
*
*
Fig. 5 Typical application diagram
DESCRIPTION
Prescaler and
AM counter The programmable divider
chain is of
A and M counter construction and therefore
contains a dual modulus front end prescaler, an
A counter
which controls the dual modulus ratio and an
M counter which
performs the bulk multi-modulus division. A programmable
divider of this construction has a division ratio of
MN1A and
a minimum integer steppable division ratio of
N(N21), where
N is the prescaler value.
Data Entry and Storage
Data is loaded from the 16-bit bus into one of the internal
buffers by applying a positive pulse to the STROBE input. The
input bus can be driven from TTL or CMOS logic levels. When
STROBE is low, the inputs are isolated and the data can be
changed without affecting the programmed state.
The data is loaded into the RF buffer when the address
input is high and into the reference buffer when low. When the
STROBE input is taken high, the
A and M and reference
counters are reset and the input data is applied to the internal
storage register. When STROBE is again taken low, the data
on the input bus is stored in the selected register and the
counters released. The STROBE input is level triggered so
that if the data is changed whilst the input is high, the final
value before STROBE goes low will be stored.
In order to prevent disturbances on the VCO control voltage
when frequency changes are made, the STROBE input disables


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