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NB2780A Datasheet(PDF) 2 Page - ON Semiconductor

Part No. NB2780A
Description  Low Power, Reduced EMI Clock Synthesizer
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NB2780A
http://onsemi.com
2
Figure 1. Block Diagram
ModOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
XIN/CLKIN
XOUT
Modulation
VDD
VCO
Output
Divider
PLL
VSS
PD
Table 1. KEY SPECIFICATIONS
Description
Specification
Supply Voltages
VDD = 3.3 V / 2.5 V
Frequency Range
30 MHz < CLKIN < 50 MHz
Cycle−to−Cycle Jitter
200 ps (maximum)
Output Duty Cycle
45/55% (worst case)
Modulation Rate Equation
FIN/1280
Frequency Deviation
"0.75% (TYP) @ 46 MHz
Figure 2. Pin Configuration
VDD
1
2
3
6
5
4
XOUT
XIN/CLKIN
ModOUT
NB2780A
VSS
PD
Table 2. PIN DESCRIPTION
Pin #
Pin Name
Type
Description
1
PD
I
Powerdown control pin. Pull low to enable Powerdown mode. Connect to VDD if not used.
2
XOUT
O
Crystal connection. If using an external reference, this pin must be left unconnected.
3
XIN/CLKIN
I
Crystal connection or external reference frequency input. This pin has dual functions. It can be
connected either to an external crystal or an external reference clock
4
VDD
P
Power supply for the entire chip.
5
ModOUT
O
Spread spectrum clock output.
6
VSS
P
Ground connection.




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