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ICS1531 bảng dữ liệu(PDF) 57 Page - Integrated Circuit Systems

tên linh kiện ICS1531
Giải thích chi tiết về linh kiện  Triple 8-bit MSPS A/D Converters with Line-Locked Clock Generator
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ICS1531 bảng dữ liệu(HTML) 57 Page - Integrated Circuit Systems

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Chapter 7
Programming
ICS1531 Rev N 12/1/99
December, 1999
57
Copyright © 1999, Integrated Circuit Systems, Inc.
All rights reserved.
ICS1531 Data Sheet - Preliminary
7.3.2
Programming Flow for Modifying Settings for Spread Spectrum
Figure 7-4.
ICS1531 Flow for PNLCLK and MCLK PLL Spread-Spectrum Settings
Set M, N, PFD Gain,
and Output Scaler
Change
PLL Freq.
?
No
Yes
Disable Spread
Spectrum Mode
PNLCLK Reg 25:1 = 0
MCLK Reg 2B:1 = 0
PNLCLK Regs 20, 21, 24
MCLK Regs 26, 27, 2A
Wait ~ 1ms
Done
PNLCLK and MCLK
Reg 2D
Yes
No
PLL Software
Reset
Change
Spread
Spectrum
Mode?
Yes
No
Enable Spread Spectrum Mode
PNLCLK Regs 22, 23, 24
MCLK Regs 28, 29, 2A
PNLCLK Reg 25:1 = 1
MCLK Reg 2B:1 = 1
Set Spread Sepctrum
Counter and Gain



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