參數(shù)資料
型號(hào): AD9548BCPZ-REEL7
廠商: Analog Devices Inc
文件頁(yè)數(shù): 87/112頁(yè)
文件大?。?/td> 0K
描述: IC CLOCK GEN/SYNCHRONIZR 88LFCSP
產(chǎn)品變化通告: AD9548 Mask Change 20/Oct/2010
標(biāo)準(zhǔn)包裝: 400
類型: 時(shí)鐘/頻率發(fā)生器,同步器
PLL:
主要目的: 以太網(wǎng),SONET/SDH,Stratum
輸入: CMOS,LVDS,LVPECL
輸出: CMOS,LVDS,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 1:1
差分 - 輸入:輸出: 是/是
頻率 - 最大: 750kHz
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: 88-VFQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 88-LFCSP-VQ(12x12)
包裝: 帶卷 (TR)
AD9548
Data Sheet
Rev. E | Page 76 of 112
Table 62. Incremental Closed-Loop Phase Lock Offset Step Size1
Address
Bits
Bit Name
Description
0x0314
[7:0]
Incremental phase
lock offset step size
(expressed in pico-
seconds per step)
Incremental phase lock offset step size, Bits[7:0]
0x0315
[7:0]
Incremental phase lock offset step size, Bits[15:8]
1
The default incremental closed-loop phase lock offset step size value is 0x03E8 = 1000 (1 ns).
Table 63. Phase Slew Rate Limit1
Address
Bits
Bit Name
Description
0x0316
[7:0]
Phase slew limit
(expressed in nano-
seconds per second)
Phase slew rate limit, Bits[7:0]
0x0317
[7:0]
Phase slew rate limit, Bits[15:8]
1
The default phase slew rate limit is 0 (or disabled).
Table 64. History Accumulation Timer1
Address
Bits
Bit Name
Description
0x0318
[7:0]
History accumulation
timer (expressed in
milliseconds)
History accumulation timer, Bits[7:0]
0x0319
[7:0]
History accumulation timer, Bits[15:8]
0x031A
[7:0]
History accumulation timer, Bits[23:16]
1
Do not program a timer value of 0. The history accumulation timer default value is 0x007530 = 30,000 (30 sec).
Table 65. History Mode
Address
Bits
Bit Name
Description
0x031B
[7:5]
Unused
[4]
Single-sample fallback
Controls the holdover history. If tuning word history is not available for the
reference that was active just prior to holdover, then
0 (default) = use the free running frequency tuning word register value.
1 = use the last tuning word from the DPLL.
[3]
Persistent history
Controls the holdover history initialization. When switching to a new reference
0 (default) = clear the tuning word history.
1 = retain the previous tuning word history.
[2:0]
Incremental average
History mode value from 0 to 7 (default = 0).
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