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SP8861 Datasheet(PDF) 2 Page - Zarlink Semiconductor Inc

Part No. SP8861
Description  1·3GHz Low Power Single-Chip Frequency Synthesiser
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Maker  ZARLINK [Zarlink Semiconductor Inc]
Homepage  http://www.zarlink.com
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SP8861 Datasheet(HTML) 2 Page - Zarlink Semiconductor Inc

 
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2
SP8861
Fig. 2 SP8861 block diagram
Fig. 3 Detailed block diagram of lock detect circuit
fPD
11
15 BIT
M COUNT
1
LOGIC
4 BIT
A COUNT
1
LOGIC
2 BIT
1 BIT
DUAL
F1/F2
DATA
BUFFER
N0
N3
N4
N18
N19
N20
N21
22 BIT SHIFT REGISTER
1 BIT
13 BIT
2 BIT
N0
N12
N14
N15
N13
SINGLE
REFERENCE
BUFFER
LOGIC
2-BIT
SR
DATA
INPUT
16/17 OR 8/9
CONTROL
fREF
PHASE
DETECTOR
LOGIC
R
COUNT
OUTPUT
INTERFACE
CHARGE
PUMP 1
CHARGE
PUMP 2
PD1
3
LOCK
DETECT
RF INPUT
10
F1/F2
DATA
CLOCK
ENABLE
POWER
DOWN
13
14
15
16
6
PD2
25
27
Cd
28
RPD
24
20
21
CRYSTAL
FREF*
5
4
FPD*
*FREF and FPD outputs are reversed by the phase detector
sense bit in the F1/F2 programming word. The pin allocations
shown are correct when the sense bit is low (see Table 2 and Fig. 7).
RF INPUT
REFERENCE
DIVIDER
+
VCC
PHASE
DETECTOR
fPD
fREF
CHARGE
PUMP 2
TRANSCONDUCTANCE
AMPLIFIER
3
1
CHARGE
PUMP 1
+
+
3
1
3
1 BUFFER
10k
45k
45k
DUAL VOLTAGE
COMPARATOR
PD1
3
CHARGE PUMP 1 DISABLE
(SEE TABLE 4)
RPD
24
PD2
25
Cd
28
LOCK DETECT
27
Output current at pin 27 is proportional to
voltage difference between pins 25 and 28,
IMAX = 625µA


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