参数资料
型号: ACS8944T
厂商: Semtech
文件页数: 18/24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: SONET/SDH
输入: LVPECL
输出: LVPECL
电路数: 1
比率 - 输入:输出: 1:1
差分 - 输入:输出: 是/是
频率 - 最大: 155.52MHz
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: 管件
ADVANCED COMMUNICATIONS
FINAL
DATASHEET
Revision 3/November 2006 Semtech Corp.
Page 3
www.semtech.com
ACS8944 JAM PLL
Figure 2 ACS8944 Pin Diagram
Note...I = Input, O = Output, P = Power, LVTTL/LVCMOSU = LVTTL/LVCMOS input with pull-up resistor, LVTTL/LVCMOSD = LVTTL/LVCMOS input
with pull-down resistor.
Pin Diagram
Pin Description
Table 1 Power Pins
Pin No.
Symbol
I/O
Type
Description
1
VDDO1
P
-
Supply voltage. Supply to OUTP & OUTN clock output pins, +3.3 Volts ±5%.
25, 26
VDDADIV
P
-
Supply voltage. Supply for internal dividers in VCO loop, kept as an isolated supply to
allow for low supply noise for the output divider stages. +3.3 Volts ±5%.
29, 43
VDDP1,VDDP2
P
-
Supply voltage. Supply to input and output pins. +3.3 Volts ±5%.
34
VDDARF
P
-
Supply voltage. Supply for phase and frequency detector (PFD), kept as an isolated supply
to allow for low supply noise. +3.3 Volts ±5%.
38
VDDOSC
P
-
Supply voltage. Supply input to the internal VCO. +3.3 Volts +5%/-10%
39
VSSOSC
P
-
Supply ground. 0 V for VCO.
49
VSS0
P
-
Supply ground. Common 0 V.
This is the central leadframe pad on the underneath of the package.
F8944_D_002PINDIAG_04
1
VDDO1
2
OUTN
3
OUTP
4
NC1
5
NC2
7
NC4
8
NC5
9
NC6
10 NC7
11 NC8
12 NC9
6
NC3
36
VCN
35
VCP
34
VDDARF
33
NC15
32
NC14
31
NC13
30
NC12
29
VDDP1
28
CLKP
27
CLKN
26
VDDADIV
25
VDDADIV
1
3
CFG_OUT0
14
CFG_OUT1
15
CFG_OUT2
1
6
CFG_OUT3
17
L
O
C
K
B
18
I
C
1
19
IC2
20
NC1
0
21
N
C
1
22
EXT1
23
EXT2
24
E
X
T
3
47
N
C
1
8
48
NC19
46
OP_FSEL
45
NC1
7
44
NC1
6
43
VDDP2
42
IC5
41
I
C
4
40
RESETB
39
V
SSOSC
38
VDDOSC
37
I
C
3
ACS8944
Dimensions: 7 mm x 7 mm
Lead Pitch: 0.5 mm
(Leads centered on package)
Connect large central pad
to GND
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