参数资料
型号: ACS8947T
厂商: Semtech
文件页数: 5/30页
文件大小: 0K
描述: IC JITTER ATT MULT PLL 48-QFN
标准包装: 1
类型: 时钟/频率发生器,多路复用器
PLL:
主要目的: 3G,以太网,PCI,SONET/SDH,无线系统
输入: LVPECL
输出: CML,LVPECL
电路数: 1
比率 - 输入:输出: 2:4
差分 - 输入:输出: 是/是
频率 - 最大: 625MHz
电源电压: 3.135 V ~ 3.465 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 48-VFQFN 裸露焊盘
供应商设备封装: 48-QFN(7x7)
包装: 托盘
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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