MB1502 Datasheet, PDF (3/15 Pages) Fujitsu Component Limited. – SERIAL INPUT PLL FREQUENCY SYNTHESIZER

MB1502
PIN DESCRIPTION
Pin
No.
Pin
Name
I/O
Description
1
OSC_IN
I
Oscillator input.
2
OSC_OUT
O
Oscillator output.
A crystal is placed between OSC_IN and OSC_OUT.
3
V_P
—
Power supply input for charge pump and analog switch.
4
V_CC
—
Power supply voltage input.
5
D_O
O
Charge pump output.
The characteristics of charge pump is reversed depending upon FC input.
6
GND
—
Ground
Phase comparator output.
7
LD
O
Normally this pin outputs high level. While the phase difference of f_r, and f_p exists, this
pin outputs low level.
8
f_IN
l
Prescaler input.
The connection with an external VCO should be AC connection.
9
Clock
I
Clock input for 19-bit shift register and 16-bit shift register.
On rising edge of the clock shifts one bit of data into the shift registers.
Binary serial data input.
10
Data
l
The last bit of the data is a control bit which specified destination of shift registers.
When this bit is high level and LE is high level, the data stored in shift register is transferred to 15-bit latch.
When this bit is low level and LE is high level, the data is transferred to 18-bit latch.
Load enable input (with internal pull up resistor).
11
LE
I
When LE is high or open, the data stored in shift register is transferred into latch depending upon the control
bit. At the time, internal charge pump output to be connected to BISW pin because internal analog switch
becomes ON state.
Phase select input of phase comparator (with internal pull up resistor).
12
FC
l
When FC is low level, the characteristics of charge pump, phase comparator is reversed.
FC input signal is also used to control fOUT pin (test pin) output level for f_r or f_p.
Analog switch output.
13
BISW
O
Usually BISW pin is set high-impedance state. When internal analog switch is ON (LE pin is high level), this
pin outputs internal charge pump state.
Monitor pin of phase comparator input.
14
f_OUT
O
f_OUT pin outputs either programmable reference divider output (f_r) or programmable divider output (f_p)
depending upon FC pin input level.
15
∅P
O
Outputs for external charge pump.
16
∅R
O
The characteristics are reversed according to FC input.
∅P pin is N-channel open drain output.
3