參數(shù)資料
型號(hào): AD9558BCPZ-REEL7
廠(chǎng)商: Analog Devices Inc
文件頁(yè)數(shù): 26/104頁(yè)
文件大?。?/td> 0K
描述: IC CLK XLATR PLL 1250MHZ 64LFCSP
產(chǎn)品變化通告: AD9558 Minor Metal Mask Change 17/Apr/2012
標(biāo)準(zhǔn)包裝: 750
類(lèi)型: 時(shí)鐘/頻率轉(zhuǎn)換器
PLL:
主要目的: 以太網(wǎng),SONET/SDH,Stratum
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,HSTL,LVDS
電路數(shù): 1
比率 - 輸入:輸出: 4:6
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(lèi)型: 表面貼裝
封裝/外殼: 64-VFQFN 裸露焊盤(pán),CSP
供應(yīng)商設(shè)備封裝: 64-LFCSP-VQ(9x9)
包裝: 帶卷 (TR)
AD9558
Data Sheet
Rev. B | Page 28 of 104
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 0x07E6. The AD9558 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 valid reference that has the highest priority.
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