SM8720AV Datasheet, PDF (2/6 Pages) Nippon Precision Circuits Inc – 3-PLL Multi-Output Clock Generator

BLOCK DIAGRAM
SM8720AV
FIN
CLK1_ON
CLK2_ON
SEL1
SEL2
CLK3_ON
Control
Logic
Reference
Divider 1
Phase
Detector 1
Charge
Pump 1
LPF 1
VCO 1
(PLL1)
Loop
Divider 1
Reference
Divider 2
Phase
Detector 2
Charge
Pump 2
LPF 2
VCO 2
(PLL2)
Loop
Divider 2
Reference
Divider 3
Phase
Detector 3
Charge
Pump 3
LPF 3
VCO 3
(PLL3)
Loop
Divider 3
CLK1OUT
CLK2OUT
CLK3OUT
REFOUT
PIN DESCRIPTION
Number
Name
I/O
1
VDD1
–
2
FIN
I
3
VSS1
–
4
CLK3OUT
O
5
CLK3_ON
I
6
SEL1
I
7
CLK1_ON
I
8
VDD2
–
9
CLK1OUT
O
10
VSS2
–
11
CLK2OUT
O
12
VDD3
–
13
CLK2_ON
I
14
SEL2
I
15
VSS3
–
16
REFOUT
O
Description
Supply voltage 1
Master clock input (27MHz constant input)
Supply ground 1
Clock output 3 (36/45/48.6MHz switchable output)
Output clock enable 3 (HIGH = enable, LOW = disable)
Output select 1
Output clock enable 1 (HIGH = enable, LOW = disable)
Supply voltage 2
Clock output 1 (22.5792MHz constant output)
Supply ground 2
Clock output 1 (48MHz constant output)
Supply voltage 3
Output clock enable 3 (HIGH = enable, LOW = disable)
Output select 2
Supply ground 3
Master clock output (27MHz constant output)
NIPPON PRECISION CIRCUITS INC.—2