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参数资料
| 型号： | LMX2315TMX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | XO, clock |
| 英文描述： | Frequency Synthesizer for RF Personal Communications |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 1200 MHz, PDSO20 |
| 封装： | 0.173 INCH, PLASTIC, TSSOP-20 |
| 文件页数： | 19/22页 |
| 文件大小： | 409K |
| 代理商： | LMX2315TMX |
Application Information
(Continued)
Example
Y
2
K
VCO
e
34 MHz/V
K
w
e
2.8 mA (Note 1)
RF
opt
e
1665 MHz
F
ref
e
300 kHz
N
e
RF
opt
/f
ref
e
5550
0
p
e
2
q
*
20 kHz
e
1.256e5
w
p
e
43
ATTEN
e
12 dB
T3
e
0
(2
q
#
300e3)
2
T1
e
sec
w
b
tan
w
0
p
e
3.462e
b
6
10
(12/20)
b
1
e
9.16e
b
7
0
c
e
tan43 (3.862e
b
6
a
9.16e
b
7)
(3.462e
b
6
a
9.16e
b
7)
2
a
3.462e
b
6
#
9.16e
b
7)
(9.682e4)
2
#
5550
#
D
e
0.63 nF
#
D
0
1
a
(3.462e
b
6
a
9.16e
b
7)
2
a
3.462e
b
6
#
9.16e
b
7
[
tan43 (3.462e
b
6
a
9.16e
b
7)
]
2
b
1
(
T2
e
C2
e
0.63 nF
#
1
(9.682e4)
2
(3.462e
b
6
a
9.16e
b
7)
(2.8e
b
3)
#
34e6
e
2.437e
b
5
C1
e
3.462e
b
6
2.437e
b
5
[
1
a
(9.682e4)
2
#
(2.437e
b
5)
2
]
[
1
a
(9.682e4)
2
(3.462e
b
6)
2
] [
1
a
(9.682e4)
2
#
(9.16e
b
7)
2
]
(
(/2
2.437e
b
5
3.402e
b
6
b
1
J
e
3.88 nF;
R2
e
2.437e
b
5
3.88e
b
9
e
6.28 k
X
;
if we choose R3
e
27k; then C3
e
9.16e
b
7
27e3
e
34 pF.
Converting to standard component values gives the follow-
ing filter values, which are shown in Figure 4.
C1
e
560 pF
R2
e
6.8 k
X
C2
e
2700 pF
R3
e
27 k
X
C3
e
56 pF
Note 1:
See related equation for K
w
in Charge Pump Current Specification
Definitions. For this example V
P
e
3.3V. The value for K
w
can then
be approximated using the curves in the Typical Performance Char-
acteristics for Charge Pump Current vs. D
o
Voltage. The units for
K
w
are in mA. You may also use K
w
e
(2.8 mA/2
q
rad), but in this
case you must convert K
VCO
to (rad/V) multiplying by 2
q
.
TL/W/12339–33
FIGURE 9.
E
20 kHz Loop Filter
http://www.national.com
19
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