NB2579A データシートの表示（PDF） - ON Semiconductor
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NB2579A Datasheet PDF : 8 Pages
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XIN/CLKIN
XOUT
Crystal
Oscillator
NB2579A
SSON
Frequency
Divider
Feedback
Divider
Modulation
Phase
Detector
Loop
Filter
VDD
PLL
VCO
Output
Divider
ModOUT
Table 1. KEY SPECIFICATIONS
Description
Supply Voltages
Frequency Range
Cycle−to−Cycle Jitter
Output Duty Cycle
Modulation Rate Equation
Frequency Deviation
VSS
Figure 1. Block Diagram
Specification
VDD = 3.3 V / 2.5 V
13 MHz < CLKIN < 30 MHz
200 ps (maximum)
45/55% (worst case)
FIN/640
"1% @ 24 MHz
SSON 1
XOUT 2
XIN/CLKIN 3
NB2579A
6 VSS
5 ModOUT
4 VDD
Figure 2. Pin Configuration
Table 2. PIN DESCRIPTION
Pin #
1
2
3
4
5
6
Pin Name
SSON
XOUT
XIN/CLKIN
VDD
ModOUT
VSS
Type
Description
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.
O Crystal connection. If using an external reference, this pin must be left unconnected.
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.
P Power supply for the entire chip.
O Spread spectrum clock output.
P Ground connection.
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