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SP8853AHC Datasheet(PDF) 6 Page - Mitel Networks Corporation

Part # SP8853AHC
Description  1쨌3GHz Professional Synthesiser
Download  14 Pages
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Manufacturer  MITEL [Mitel Networks Corporation]
Direct Link  http://www.mitel.com
Logo MITEL - Mitel Networks Corporation

SP8853AHC Datasheet(HTML) 6 Page - Mitel Networks Corporation

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6
SP8853A/B
An F1 or F2 update cycle will consist of a byte containing
24 bits whereas the reference byte will contain 18 bits. The
device requires 3 bytes, each with a chip select sequence,
totalling 66 bits to fully program.
When the dual modulus
A counter is set to 48/9, the data
required to set the counter is reduced by one bit, leaving an
unused bit in the 22-bit F1/F2 buffer. This bit must always be
set to zero when the 48/9 mode is required. Various
programming sequences are shown in Fig. 7.
The data entry and storage registers are always powered
up, making it possible to enter data when the device is in the
powered down state.
PD2
PD2
Result
0
1
0
1
0
0
1
1
FREF and FPD outputs off, charge pumps 1 and 2 on
FREF and FPD outputs on, charge pump 1 off, charge pump 2 on
FREF and FPD outputs off, charge pump 1 disabled by lock detect, charge pump 2 on
FREF and FPD outputs on, charge pump 1 disabled by lock detect, charge pump 2 on
Table 4
Fig. 6 Application diagrams
1
5V
CONTROL
MICRO
432
1
28
27
26
12
13
14
15
16
17
18
5
6
7
8
9
10
11
25
24
23
22
21
20
19
SP8853
1n
33p
39p
FREF
FPD
1
5V
1n
0·1
µ
1
5V
SL562
+
C1
C2
R2
Rx
Rx
LOOP FILTER
VOLTAGE
CONTROLLED
OSCILLATOR
1n
VCC
2
1
5V
Rb
RPD
1
5V
2·2k
Rb >
0·25
PD2 current
Fig. 6a Typical application
128
27
26
25
24
SP8853
Cd
VCC
Ra
Ra
2
3
TO LOOP
AMPLIFIER
Fig. 6c Use of lock detect circuit with PD1
Fig. 6b Connection
of external reference
EXTERNAL
REFERENCE
SOURCE
NC
21
20
19
1
5V
22k
470
TO VCO
VARICAP
SUPPLY
10k
LOOP
FILTER
FROM
CHARGE
PUMP
Fig. 6d Simple discrete amplifier
Ra > 23
0·25
PD2 current
VCC


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