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參數(shù)資料
| 型號： | CDC421XXX |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | FULLY INTEGRATED FIXED FREQUENCY LOW-JITTER, CRYSTAL-OSCILLATOR CLOCK GENERATOR |
| 中文描述： | 完全集成的固定頻率低抖動，晶體振蕩器時鐘發(fā)生器 |
| 文件頁數(shù)： | 2/18頁 |
| 文件大小： | 507K |
| 代理商： | CDC421XXX |
www.ti.com
Crystal
Oscillator
Feedback
Divider
Output
Divider
PFD/
Charge Pump
Prescaler
Loop Filter
XIN 1
XIN 2
B0230-01
VCO
PACKAGE (QFN-24)
The CDC421xxx is packaged in a QFN-24 terminal package. The QFN package footprint is shown. Terminal
locations and numbers are shown in
Figure 2
.
NC
V
CC
15
14
13
RGE PACKAGE
(TOP VIEW)
CDC421xxx
N
N
X
X
N
N
2
2
2
2
2
1
NC
1
2
3
NC
4
NC
5
NC
G
7
8
9
G
1
1
O
N
1
N
18
NC
17
V
CC
16
NC
NC
O
CE
NC
P0024-06
6
CDC421xxx
SLAS540–APRIL 2007
Figure 1. High-Level Block Diagram of the CDC421xxx
Figure 2. Pinout of the CDC421xxx QFN-24 Package
The terminal functions table shows the terminal descriptions for the CDC421xxx QFN-24 package.
Table 1. TERMINAL FUNCTIONS
TERMINAL
ESD
TYPE
DESCRIPTION
PROTECTION
NAME
V
CC
GND
NO.
16, 17
8, 9
Power
GND
Y
Y
3.3V power supply
Ground
In crystal input mode, connect XIN1 to one end of the crystal and XIN2 to the
other end of the crystal. In LVCMOS single-ended driven mode, XIN1 (pin 21) acts
as input reference and XIN2 should connect to GND.
XIN 1
XIN 2
21
22
I
I
Y
N
2
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