MB15F78UL Datasheet, PDF (3/27 Pages) Fujitsu Component Limited. – Dual Serial Input PLL Frequency Synthesizer

MB15F78UL
s PIN DESCRIPTION
Pin no.
TSSOP BCC
1
19
2
20
3
1
4
2
5
3
6
4
7
5
8
6
9
7
10
8
11
9
12
10
13
11
14
12
15
13
16
14
17
15
18
16
19
17
20
18
Pin name I/O
Descriptions
OSCIN
GND
finTX
XfinTX
GNDTX
VCCTX
PSTX
VpTX
DOTX
LD/fout
DORX
VpRX
PSRX
VCCRX
GNDRX
XfinRX
finRX
LE
Data
Clock
I
The programmable reference divider input pin. TCXO should be connected
with an AC coupling capacitor.
 Ground pin for OSC input buffer and the shift register circuit.
I
Prescaler input pin for the TX-PLL.
Connection to an external VCO should be via AC coupling.
I
Prescaler complimentary input pin for the TX-PLL section.
This pin should be grounded via a capacitor.
 Ground pin for the TX-PLL section.

Power supply voltage input pin for the TX-PLL section (except for the charge
pump circuit) , the oscillator input buffer and the shift register.
Power saving mode control pin for the TX-PLL section. This pin must be set
I at “L” when the power supply is started up. (Open is prohibited.)
PSTX = “H” ; Normal mode/PSTX = “L” ; Power saving mode
 Power supply voltage input pin for the TX-PLL charge pump.
O Charge pump output pin for the TX-PLL section.
Lock detect signal output (LD) /phase comparator monitoring
O output (fout) .The output signal is selected by LDS bit in the serial data.
LDS bit = “H” ; outputs fout signal/LDS bit = “L” ; outputs LD signal
O Charge pump output pin for the RX-PLL section.
 Power supply voltage input pin for the RX-PLL charge pump.
Power saving mode control pin for the RX-PLL section. This pin must be set
I at “L” when the power supply is started up. (Open is prohibited.)
PSRX = “H” ; Normal mode/PSRX = “L” ; Power saving mode

Power supply voltage input pin for the RX-PLL section (except for the charge
pump circuit)
 Ground pin for the RX-PLL section
I
Prescaler complimentary input pin for the RX-PLL section.
This pin should be grounded via a capacitor.
I
Prescaler input pin for the RX-PLL.
Connection to an external VCO should be via AC coupling.
Load enable signal input pin (with the schmitt trigger circuit)
I When LE is set “H”, data in the shift register is transferred to the
corresponding latch according to the control bit in a serial data.
Serial data input pin (with the schmitt trigger circuit)
I
Data is transferred to the corresponding latch (TX-ref. counter, TX-prog.
counter, RX-ref.counter, RX-prog.counter) according to the control bit in
a serial data.
I
Clock input pin for the 23-bit shift register (with a schmitt trigger circuit)
One bit of data is shifted into the shift register on a rising edge of the clock.
3