Figure 8 Jitter Tr" />
參數(shù)資料
型號: ACS8947T
廠商: Semtech
文件頁數(shù): 5/30頁
文件大?。?/td> 0K
描述: IC JITTER ATT MULT PLL 48-QFN
標(biāo)準(zhǔn)包裝: 1
類型: 時鐘/頻率發(fā)生器,多路復(fù)用器
PLL:
主要目的: 3G,以太網(wǎng),PCI,SONET/SDH,無線系統(tǒng)
輸入: LVPECL
輸出: CML,LVPECL
電路數(shù): 1
比率 - 輸入:輸出: 2:4
差分 - 輸入:輸出: 是/是
頻率 - 最大: 625MHz
電源電壓: 3.135 V ~ 3.465 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 48-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 48-QFN(7x7)
包裝: 托盤
ACS8947T JAM PLL
ADVANCED COMMS & SENSING
FINAL
DATASHEET
Revision 1.00/September 2007 Semtech Corp.
Page 13
www.semtech.com
Figure 8 Jitter Transfer Characteristic - ACS8947T
Stand-alone
Phase Noise Performance
The inherent jitter generation by the ACS8947T is shown
in the phase noise plot in Figure 9, measured on a
155.52 MHz output clock using an input reference of
19.44 MHz.
Figure 9 Phase Noise Offset from Carrier of ACS8947T
622.08 MHz output clock
PLL Configuration
On device reset all divider ratios, charge pump settings,
lock detector mode and output pad types are set by the
Configuration Block, which decodes the wiring
connections present on CFG[11:0]. This allows the PLL to
be entirely configured without the need for an external
microprocessor.
The configuration pins CFG[11:0] (device pins 18:25 and
48:45) are hardwired (via VDD, GND, ALARM1_CO0,
ALARM2_CO1, CFG_OUT2, or ALARMC_CO3) to produce a
unique programming code. On device reset, this code is
decoded and used to configure the PLL.
Evaluation software that calculates the configuration
hardwire connection matrix for CFG[11:0] based on the
required PLL setup is available for download from
Semtech. Figure 10 shows a typical connection sheet.
Figure 10 Example of ACS8947T Connection Sheet
Use of the ACS8947T evaluation software is the simplest
and preferred method of calculating the required divider
ratios as this will also calculate loop filter component
values and configuration wiring settings.
TBIL
ACS8944 RMS Jitter Transfer Curve
-27.0
-24.0
-21.0
-18.0
-15.0
-12.0
-9.0
-6.0
-3.0
0.0
3.0
100
1000
10000
100000
Frequency (Hz)
H(
s
)d
B
TBIL
-160
-140
-120
-100
-80
-60
-40
-20
0
1.0E+02
1.0E+03
1.0E+04
1.0E+05
1.0E+06
1.0E+07
Frequency (Hz)
Ph
a
se
N
o
ise
(
d
Bc
/H
z)
Typical Phase Noise @ 155.52MHz
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