參數(shù)資料
型號: AD9557BCPZ-REEL7
廠商: Analog Devices Inc
文件頁數(shù): 20/92頁
文件大?。?/td> 0K
描述: IC CLK XLATR PLL 1250MHZ 40LFCSP
產(chǎn)品變化通告: Minor Mask Change 11/Apr/2012
標準包裝: 750
類型: 時鐘/頻率轉(zhuǎn)換器
PLL:
主要目的: 以太網(wǎng),SONET/SDH
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,HSTL,LVDS
電路數(shù): 1
比率 - 輸入:輸出: 2:2
差分 - 輸入:輸出: 是/是
頻率 - 最大: 1.25GHz
電源電壓: 1.71 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 40-VFQFN 裸露焊盤,CSP
供應商設備封裝: 40-LFCSP-VQ(6x6)
包裝: 帶卷 (TR)
Data Sheet
AD9557
Rev. B | Page 27 of 92
Program the Digital Phase-Locked Loop (DPLL)
The DPLL parameters reside in Register 0x0300 to
Register 0x032E. They include the following:
Free run frequency
DPLL pull-in range limits
DPLL closed-loop phase offset
Phase slew control (for hitless reference switching)
Tuning word history control (for holdover operation)
Program the Reference Inputs
The reference input parameters reside in Register 0x0600 to
Register 0x0602. See the Reference Clock Input section for
details on programming these functions. They include the
following:
Reference power-down
Reference logic family
Reference priority
Program the Reference Profiles
The reference profile parameters reside in Register 0x0700 to
Register 0x0766. The AD9557 evaluation software contains
a wizard that calculates these values based on the user’s input
frequency. See the Reference Profiles section for details on
programming these functions. They include the following:
Reference period
Reference period tolerance
Reference validation timer
Selection of high phase margin, loop filter coefficients
DPLL loop bandwidth
Reference prescaler (R divider)
Feedback dividers (N1, N2, N3, FRAC1, and MOD1)
Phase and frequency lock detector controls
Generate the Reference Acquisition
After the registers are programmed, the user can clear the user
freerun bit (Register 0x0A01[5]) and issue an I/O update, using
Register 0x0005[0] to invoke all of the register settings that are
programmed up to this point.
After the registers are programmed, the DPLL locks to the first
available reference that has the highest priority.
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