MB1503 Datasheet, PDF (4/15 Pages) Fujitsu Component Limited. – LOW-POWER PLL FREQUENCY SYNTHESIZER WITH POWER SAVE FUNCTION (1.1GHz)

MB1503
PIN DESCRIPTION
Pin No. Pin Name I/O
1
OSC_IN
I
2
OSC_OUT O
3
V_P
–
4
V_CC
–
5
D_O
O
6
GND
–
7
LD
O
8
f_IN
I
9
Clock
I
10
Data
I
Description
Programmable reference divider input
Oscillator input
An external crystal is connected to this pin.
Oscillator output
An external crystal is connected to this pin.
Power supply input for charge pump and analog switch
Power supply
Charge pump output
The phase of the charge pump is reversed depending on the FC input.
Ground
Phase comparator output
The output level is high when LD is locked. The output level is low when LD is unlocked.
Prescaler input
Connection with an external VCO should be done by AC coupling.
Clock input for 19-bit and 16-bit shift registers
Data is shifted into the shift register on the rising edge of the clock.The Schmitt trigger is
contained.
Serial data input using binary code
The last bit of the data is a control bit.
When the control bit is high, data is transmitted to the 15-bit latch.
When it is low, data is transmitted to the 18-bit latch.The Schmitt trigger input is involved.
11
LE
I
Load enable signal input
When LE is high, the data of the shift register are transferred to a latch, depending on the
control bit in the serial data. At the same time, an internal analog switch turns on and the output
of the internal charge pump is connected to the BiSW pin.The Schmitt trigger input is involved.
12
FC
I
Phase select input of phase comparator (with internal pull-up resistor)
When FC is low, the characteristics of the charge pump and phase comparator are reversed.
The FC input signal is also used to control the f_OUT pin (test pin) of f_R or f_P.
13
BiSW
O Analog switch output
BiSW is usually in the high-impedance state. When the switch is turned on (LE is high), the
state of the internal charge pump is output.
14
f_P
15
f_R
16
PS
O Monitor pin of programmable counter output
O Monitor pin of reference counter output
I
Power save signal input
Set PS low while the system is powered (never use pin 16 as it is opened)
PS = High : Operation mode
PS = Low : Stand-by mode
4