- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383838 > ST49C101A (Exar Corporation) High Frequency Clock Multiplier PDF資料下載
參數(shù)資料
| 型號： | ST49C101A |
| 廠商： | Exar Corporation |
| 英文描述： | High Frequency Clock Multiplier |
| 中文描述： | 高頻時鐘倍頻 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大?。?/td> | 109K |
| 代理商： | ST49C101A |
ST49C101A-XX
4
Rev. 2.20
MULTIPLICATION FACTOR AND OUTPUT FRE-
QUENCY SELECTION
The ST49C101A-XX contains an analog phase locked
loop (PLL) circuit with digital closed loop dividers and
a final output divider to achieve the desired dividing
ratios for the clock output. The preprogrammed multi-
plication factor and output frequency are shown on
Table 1. The accuracy of the output frequency pro-
duced by the ST49C101A-XX depends on its input
frequency and multiplication factor.
APPLICATIONS
Two application examples are shown in Figure 2 and 3.
Figure 2 shows a lower cost high frequency crystal
oscillator circuit using the ST49C101-xx to increase
the fundamental crystal frequency. The crystal Y1 is
connected to XTAL1 and XTAL2 pins to use the
internal oscillator circuit. The oscillator provides the
reference clock to the PLL circuit for clock rate multi-
plication. Figure 3 shows a similar circuit using
external clock input on XTAL1 pin instead.
If a sinewave is used for external clock, it may be
necessary to AC couple the signal with a 0.047uF
capacitor to XTAL1 pin so that the internal circuitry
can establish the proper bias. Also, keep the peak-to-
peak signal, at XTAL pin, above ground level (AGND)
and below AVCC.
As a general board layout rule, it is recommended to
use two 0.01
μ
F bypass capacitors on DVCC and
AVCC power supply pins, and put them as closely as
possible to the chip.
Notes
1
See AC electrical characteristics for maximum operating
requency.
X
X
-
A
1
0
1
C
9
4
T
S
r
o
t
a
F
t
1
u
y
p
c
t
u
n
e
O
u
.
a
e
r
F
M
q
C
C
V
1
1
0
-
A
1
0
1
C
9
4
T
S
2
1
z
z
H
H
M
M
0
0
0
4
2
1
V
V
0
3
3
0
-
A
1
0
1
C
9
4
T
S
8
z
z
H
H
M
M
0
0
0
4
2
1
V
V
0
3
5
0
-
A
1
0
1
C
9
4
T
S
6
z
z
H
H
M
M
0
0
0
4
2
1
V
V
0
3
6
0
-
A
1
0
1
C
9
4
T
S
4
z
H
M
0
2
1
r
V
0
3
7
0
-
A
1
0
1
C
9
4
T
S
3
z
z
H
H
M
M
0
0
8
7
V
V
0
3
8
0
-
A
1
0
1
C
9
4
T
S
2
z
z
H
H
M
M
0
0
8
7
V
V
0
3
9
0
-
A
1
0
1
C
9
4
T
S
5
z
z
H
H
M
M
0
0
0
4
2
1
V
V
0
3
0
1
-
A
1
0
1
C
9
4
T
S
0
1
z
H
M
0
8
1
V
3
3
1
-
A
1
0
1
C
9
4
T
S
8
z
H
M
0
8
1
V
3
5
1
-
A
1
0
1
C
9
4
T
S
6
z
H
M
0
8
1
V
3
Table 1. Preprogrammed Options
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ST49C101ACF8-01 | High Frequency Clock Multiplier |
| ST49C101ACF8-03 | High Frequency Clock Multiplier |
| ST49C101ACF8-05 | PLUG, PANEL, SCREW, AU, 3P+E WAY; Connector type:Circular; Gender:Receptacle; Ways, No. of:3+E; Termination method:Screw; Plating, contact:Gold; Series:ECOMATE; Contact style:Pin; Mounting type:Panel Mount; Approval Bodies:VDE, SEV, RoHS Compliant: Yes |
| ST49C101ACF8-06 | High Frequency Clock Multiplier |
| ST49C101ACF8-07 | High Frequency Clock Multiplier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ST49C101A-01 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Frequency Converter |
| ST49C101A-03 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Frequency Converter |
| ST49C101A-05 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Frequency Converter |
| ST49C101A-06 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Frequency Converter |
| ST49C101A-07 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Frequency Converter |
發(fā)布緊急采購，3分鐘左右您將得到回復。