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NB2579A Datasheet(PDF) 2 Page - ON Semiconductor

No. de Pieza. NB2579A
Descripción  Low Power, Reduced EMI Clock Synthesizer
Descarga  8 Pages
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Fabricante  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
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NB2579A Datasheet(HTML) 2 Page - ON Semiconductor

   
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NB2579A
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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
SSON
Table 1. KEY SPECIFICATIONS
Description
Specification
Supply Voltages
VDD = 3.3 V / 2.5 V
Frequency Range
13 MHz < CLKIN < 30 MHz
Cycle−to−Cycle Jitter
200 ps (maximum)
Output Duty Cycle
45/55% (worst case)
Modulation Rate Equation
FIN/640
Frequency Deviation
"1% @ 24 MHz
Figure 2. Pin Configuration
VDD
1
2
3
6
5
4
SSON
XOUT
XIN/CLKIN
ModOUT
NB2579A
VSS
Table 2. PIN DESCRIPTION
Pin #
Pin Name
Type
Description
1
SSON
I
When SSON is HIGH, the spread spectrum is enabled and when LOW, it turns off the spread
spectrum. Connect the pin to ground when the spread spectrum feature is not required.
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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