MB15F04 Datasheet, PDF (7/23 Pages) Fujitsu Component Limited. – Dual Serial Input PLL Frequency Synthesizer

MB15F04
s FUNCTIONAL DESCRIPTIONS
The divide ratio can be calculated using the following equation:
fVCO = {(P x N) + A} x fOSC ÷ R (A < N)
fVCO: Output frequency of external voltage controlled ocillator (VCO)
P: Preset divide ratio of dual modulus prescaler (64 or 128)
N: Preset divide ratio of binary 11-bit programmable counter (5 to 2,047)
A: Preset divide ratio of binary 7-bit swallow counter (0≤ A ≤ 127)
fOSC: Reference oscillation frequency
R: Preset divide ratio of binary 14-bit programmable reference counter (5 to 16,383)
Serial Data Input
Serial data is entered using three pins, Data pin, Clock pin, and LE pin. Programmable dividers of TX/RX–PLL
sections, programmable reference dividers of TX/RX PLL sections are controlled individually.
Serial data of binary data is entered through Data pin.
On rising edge of clock, one bit of serial data is transferred into the shift register. When load enable signal is high,
the data stored in the shift register is transferred to one of latch of them depending upon the control bit data setting.
Table1. Control Bit
Control bit
CN1
CN2
L
L
H
L
L
H
H
H
Destination of serial data
The programmable reference counter for the TX-PLL.
The programmable reference counter for the RX-PLL.
The programmable counter and the swallow counter for the TX-PLL
The programmable counter and the swallow counter for the RX-PLL
Shift Register Configuration
Programmable Reference Counter
LSB
Data Flow
MSB
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
CC T T R R R R R R R R R R R R R RX XX XX
N N 1 2 1 2 3 4 5 6 7 8 9 10 11 12 13 14
12
CNT1, 2 : Control bit
R1 to R14 : Divide ratio setting bits for the programmable reference counter (5 to 16,383)
T1, 2
: Test purpose bit
×
: Dummy bit (set to either 0 or 1)
NOTE: Data input with MSB first.
[Table. 1]
[Table. 2]
[Table. 3]
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