參數(shù)資料
型號: ACS8947T
廠商: Semtech
文件頁數(shù): 29/30頁
文件大?。?/td> 0K
描述: IC JITTER ATT MULT PLL 48-QFN
標(biāo)準包裝: 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 8
www.semtech.com
The ACS8947T is a highly configurable general purpose
Integer-N, low-jitter integrated PLL for signal cleaning,
dejittering and frequency translation. The PLL is built
around an integrated voltage controlled oscillator(VCO)
and can be used in a wide range of applications including
OC12 clock cleaning for SONET, SDH, Ethernet, PCI,
RapidIO, 3G and wireless systems.
The device can be fully programmed, without the need for
a microprocessor, by hardwiring the configuration input
pins CFG_IN[11:0] to ALARM1_CO0, ALARM2_CO1,
CFG_OUT2, ALARMC_CO3, VDD and GND as defined by
the ACS8947T evaluation software GUI.
The PLL has a fully differential external loop filter, allowing
the closed loop bandwidth and damping factor to be
customized according to target system requirements. The
tables below show typical loop filter component values
and divider settings for various applications.
Description
Table 4 Typical Loop Filter Component Values and Divider Settings
Application
I/P
(MHz)
O/P
(MHz)
VCO
(MHz/
V)
PFD
(MHz)
OSC/8
DIVIP
DIVODD
Closed
Loop
Bandwidth
(kHz)
Damping
Factor
ICP
(
μA)
CP
(nF)
Cs
(
μF)
Rs
(
Ω)
Divided By
E1
2.048
65.536
2883
2.048
176
1
11
2
3.8
210
1.5
22
470
DS1
1.544
49.408
2767
1.544
224
1
7
2
3.8
210
1.2
15
680
E3
34.368 68.736
2749
34.37
10
1
5
10
1.2
160
0.56
0.068
2700
DS3
44.736 44.736
2863
44.74
8
1
2
1.2
40
82
6.8
82
SONET
19.44
622.08
2488
19.44
16
1
2
1.2
160
150
15
56
Ethernet
25
625
2500
12.5
25
2
1
2
1.2
210
120
15
68
Ethernet
62.5
125
2500
62.5
5
1
5
2
1.2
40
82
15
82
Ethernet
10
100
2800
10
35
1
7
100
3.8
210
0.56
0.68
2700
PCI
133
2660
66.5
5
2
5
2
1.2
40
120
15
68
Memory
167
2672
167
2
1
2
3.8
10
4.7
68
150
3G
3.84
61.44
2457
3.84
80
1
5
30
1.7
210
0.18
0.68
1500
Wireless
153.6
2457
153.6
2
1
2
3.8
10
3.9
47
150
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