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NB2879A Datasheet(PDF) 2 Page - ON Semiconductor

No. de Pieza. NB2879A
Descripción  Low Power, Reduced EMI Clock Synthesizer
Descarga  6 Pages
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Fabricante  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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NB2879A Datasheet(HTML) 2 Page - ON Semiconductor

   
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NB2879A
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Figure 1. Block Diagram
ModOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
XINCLKIN
XOUT
REFOUT
Modulation
VDD
VCO
Output
Divider
PLL
VSS
Table 1. KEY SPECIFICATIONS
Description
Specification
Supply Voltages
VDD = 3.3 V "0.3 V
Frequency Range
15 MHz < CLKIN < 30 MHz
Cycle−to−Cycle Jitter
300 ps (maximum)
Output Duty Cycle
40 / 60% (worst case)
Output Rise and Fall Times
1.1 ns (maximum)
Modulation Equation
FIN/640
Frequency Deviation
"1%
Figure 2. Pin Configuration
VDD
1
2
3
6
5
4
REFOUT
XOUT
XIN/CLKIN
ModOUT
NB2879A
VSS
Table 2. PIN DESCRIPTION
Pin #
Pin Name
Type
Description
1
REFOUT
O
Buffered output of the input frequency.
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 (3.3 V).
5
ModOUT
O
Spread spectrum clock output.
6
VSS
P
Ground connection.


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