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NB2872A Datasheet(PDF) 2 Page - ON Semiconductor

No. de Pieza. NB2872A
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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NB2872A Datasheet(HTML) 2 Page - ON Semiconductor

   
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NB2872A
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Figure 1. Block Diagram
ModOUT
Crystal
Oscillator
Frequency
Divider
Feedback
Divider
Phase
Detector
Loop
Filter
XIN/CLKIN
XOUT
REFOUT
Modulation
VDD
VCO
Output
Divider
PLL
VSS
Table 1. KEY SPECIFICATIONS
Description
Specification
Supply Voltages
VDD = 3.3 V " 10%
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
−1.25%
Figure 2. Pin Configuration
VDD
1
2
3
6
5
4
REFOUT
XOUT
XIN/CLKIN
ModOUT
NB2872A
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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