MB15F04 Fujitsu Media Devices, MB15F04 Datasheet - Page 7

• Manufacturer Part Number: MB15F04
• Description: Dual Serial Input PLL Frequency Synthesizer
• Manufacturer: Fujitsu Media Devices

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The divide ratio can be calculated using the following equation:
f
f
P:
N:
A:
f
R:
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
Shift Register Configuration
VCO
VCO
OSC
FUNCTIONAL DESCRIPTIONS
:
:
LSB
= {(P x N) + A} x f
C
N
1
1
CN1
H
H
Output frequency of external voltage controlled ocillator (VCO)
Preset divide ratio of dual modulus prescaler (64 or 128)
Preset divide ratio of binary 11-bit programmable counter (5 to 2,047)
Preset divide ratio of binary 7-bit swallow counter (0 A
Reference oscillation frequency
Preset divide ratio of binary 14-bit programmable reference counter (5 to 16,383)
Programmable Reference Counter
L
L
C
N
2
2
Control bit
CNT1, 2
R1 to R14
T1, 2
NOTE: Data input with MSB first.
T
1
3
T
2
4
CN2
OSC
H
H
L
L
R
5
1
: Control bit
: Divide ratio setting bits for the programmable reference counter (5 to 16,383)
: Test purpose bit
: Dummy bit (set to either 0 or 1)
R
R
6
2
(A < N)
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
R
7
3
R
8
4
R
Data Flow
9
5
10
R
6
11
R
7
12
R
8
Destination of serial data
13
R
9
127)
14
10
R
15
11
R
16
12
R
17
13
R
18
14
R
19
X
20
X
MB15F04
[Table. 1]
[Table. 3]
[Table. 2]
21
X
22 23
X
MSB
X
7