參數(shù)資料
型號: AD9548BCPZ
廠商: Analog Devices Inc
文件頁數(shù): 86/112頁
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: 1
類型: 時鐘/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: 托盤
Data Sheet
AD9548
Rev. E | Page 75 of 112
DPLL CONFIGURATION (REGISTER 0x0300 TO REGISTER 0x031B)
Table 57. Free Running Frequency Tuning Word1
Address
Bits
Bit Name
Description
0x0300
[7:0]
Frequency
(expressed as a 48-bit
frequency tuning
word)
Free running frequency tuning word, Bits[7:0]
0x0301
[7:0]
Free running frequency tuning word, Bits[15:8]
0x0302
[7:0]
Free running frequency tuning word, Bits[23:9]
0x0303
[7:0]
Free running frequency tuning word, Bits[31:24]
0x0304
[7:0]
Free running frequency tuning word, Bits[39:32]
0x0305
[7:0]
Free running frequency tuning word, Bits[47:40]
1
The default free running tuning word is 0x000000 = 0, which equates to 0 Hz.
Table 58. Update TW
Address
Bits
Bit Name
Description
0x0306
[7:1]
Unused
[0]
Update TW
A Logic 1 written to this bit transfers the free running frequency tuning word
(Register 0300 to Register 0305) to the register imbedded in the tuning word
processing logic. Note that it is not necessary to write the update TW bit when the
device is in free-run mode. This is an autoclearing bit.
Table 59. Pull-In Range Lower Limit1
Address
Bits
Bit Name
Description
0x0307
[7:0]
Pull-in range lower
limit (expressed as a
24-bit frequency
tuning word)
Lower limit pull-in range, Bits[7:0]
0x0308
[7:0]
Lower limit pull-in range, Bits[15:8]
0x0309
[7:0]
Lower limit pull-in range, Bits[23:9]
0x030A
[7:0]
Pull-in range upper
limit (expressed as a
24-bit frequency
tuning word)
Upper limit pull-in range, Bits[7:0]
0x030B
[7:0]
Upper limit pull-in range, Bits[15:8]
0x030C
[7:0]
Upper limit pull-in range, Bits[23:9]
1
The default pull-in range lower limit is 0 and the upper range limit is 0xFFFFFF, which effectively spans the full output frequency range of the DDS.
Table 60. DDS Phase Offset1
Address
Bits
Bit Name
Description
0x030D
[7:0]
Open-loop phase
offset (expressed in
π/215 radians)
DDS phase offset, Bits[7:0]
0x030E
[7:0]
DDS phase offset, Bits[15:8]
1
The default DDS phase offset is 0.
Table 61. Fixed Closed-Loop Phase Lock Offset1
Address
Bits
Bit Name
Description
0x030F
[7:0]
Fixed phase lock
offset (expressed in
pico-seconds)
Fixed phase lock offset, Bits[7:0]
0x0310
[7:0]
Fixed phase lock offset, Bits[15:8]
0x0311
[7:0]
Fixed phase lock offset, Bits[23:16]
0x0312
[7:0]
Fixed phase lock offset, Bits[31:24]
0x0313
[7:0]
Fixed phase lock offset, Bits[39:32]
1
The default fixed closed loop phase lock offset is 0.
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