307G-03LF データシートの表示（PDF） - Integrated Circuit Systems
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307G-03LF Datasheet PDF : 12 Pages
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ICS307-03
SERIALLY PROGRAMMABLE CLOCK SOURCE
Description
The ICS307-03 is a dynamic, serially programmable
clock source which is flexible and takes up minimal
board space. Output frequencies are programmed via
a 3-wire SPI port.
An advanced PLL coupled to an array of configurable
output dividers and three outputs allows low-jitter
generation of frequencies from 200 Hz to 270 MHz.
The device can be reprogrammed during operation,
making it ideal for applications where many different
frequencies are required, or where the output
frequency must be determined at run time. Glitch-free
frequency transitions, where the clock period changes
slightly over many cycles, are possible.
Features
• Crystal or clock reference input
• 3.3 V CMOS outputs
• Three outputs can be individually configured or shut
off
• Small 16-pin TSSOP package
• Reprogrammable during operation
• 3-wire SPI serial interface
• Glitch-free output frequency switching
• User selectable charge pump current and damping
resistor
• Power-down control via hardware pin or software
control bit
• Programming word can be generated by ICS
VersaClock II Software
• Directly programmable via VersaClock II Software
and a Windows PC parallel port
• Available in Pb (lead) free package
Block Diagram
(Table 1)
X1
REF Divide
1-2055
[Bit 122]
X2
Charge Pump
(Table 3)
CP
11pF
Resistor
(Table 4)
300
pF
VCO DIVIDE
12-2055
(Table 2)
DIN
CS
SCLK
Programming
Register
(132 bits)
Divider
2 - 8232
(Table 5)
[Bit 110]
CLK1
1
0
[Bit 123]
Divider
2 - 34
(Table 6)
[Bit 111]
CLK2
1
0
[Bit 124]
Divider
2 - 34
(Table 7)
[Bit 129]
CLK3
MDS 307-03 C
1
Revision 101705
Integrated Circuit Systems ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com
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