BLOCK DIAGRAM
SM5158AS
XIN
XOUT
DATA
CLK
LE
FIN
16 BIT COUNTER
16 BIT LATCH
17 BIT SHIFT REGISTER
PHASE
DETECTOR
16 BIT LATCH
16 BIT N COUNTER
LOCK
DETECTOR
CHARGE
PUMP
BUFFER
FR
LD
DOA
DOP
OR
OV
FV
PIN DESCRIPTION
Number Name
Description
1
XIN To connect external crystal and capacitor, or external clock input pin.
2
XOUT To connect external crystal and capacitor,or oscilator output signal can be available at this pin.
3
FV Buffered input frequency divider output.phase detector input
4
VDD Positive supply pin. Apply +2.7 to 5.5 Volts.
5
DOP Charge pump output for passive lowpass filter. Single ended tristate output.
6
VSS Ground.
7
LD Lock detector output. Logic Low when PLL is unlocked.
8
FIN Comparison frequency input.Internal feedback resistor for AC coupling.
Input frequency range 20MHz to 200MHz.
9
CLK Shift register clock input.
10 DATA Serial data input.
11
LE Latch enable input.
12
DOA Chrage pump output for active lowpass filter. Single ended tristate output.
13
FR Buffered reference frequency devider output. Phase detector input.
14 TEST Test pin. Left open.
15
OV Buffered phase detector output to a differential lowpass filter.
16
OR Buffered phase detector output to a differential lowpass filter.
NIPPON PRECISION CIRCUITS-2