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參數(shù)資料
| 型號(hào)： | LMX2315 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Frequency Synthesizer for RF Personal Communications |
| 中文描述： | 頻率合成射頻個(gè)人通信 |
| 文件頁數(shù)： | 17/22頁 |
| 文件大?。?/td> | 409K |
| 代理商： | LMX2315 |
Application Information
(Continued)
Consider the following application examples:
Example
Y
1
K
VCO
e
20 MHz/V
K
w
e
5 mA (Note 1)
RF
opt
e
900 MHz
F
ref
e
200 kHz
N
e
RF
opt
/f
ref
e
4500
0
p
e
2
q
*
20 kHz
e
1.256e5
w
p
e
45
§
ATTEN
e
20 dB
T3
e
0
(2
q
#
200e3)
2
T1
e
sec
w
p
b
tan
w
p
0
p
e
3.29e
b
6
10
(20/20)
b
1
e
2.387e
b
6
0
c
e
(3.29e
b
6
a
2.387e
b
6)
[
(3.29e
b
6
a
2.387e
b
6)
2
a
3.29e
b
6
#
2.387e
b
6
]
#
D
0
1
a
(3.29e
b
6
a
2.387e
b
6)
2
a
3.29e
b
6
#
2.387e
b
6
[
(3.29e
b
6
a
2.387e
b
6)
]
2
b
1
(
e
7.045e4
T2
e
C2
e
1.085 nF
#
#
1
(7.045e4)
2
#
(3.29e
b
6
a
2.387e
b
6)
(5e
b
3)
#
20e6
e
3.549e
b
5
C1
e
3.29e
b
6
3.549e
b
5
e
1.085 nF
(7.045e4)
2
#
4500
#
D
[
1
a
(7.045e4)
2
#
(3.549e
b
5)
2
]
[
1
a
(7.045e4)
2
#
(3.29e
b
6)
2
] [
1
a
(7.045e4)
2
#
(2.387e
b
6)
2
]
(
(/2
3.55e
b
5
3.29e
b
6
b
1
J
e
10.6 nF;
R2
e
3.55e
b
5
10.6e
b
9
e
3.35 k
X
;
if we choose R3
e
22k; then C3
e
2.34e
b
6
22e3
e
106 pF.
Converting to standard component values gives the follow-
ing filter values, which are shown in Figure 4.
C1
e
1000 pF
R2
e
3.3 k
X
C2
e
10 nF
R3
e
22 k
X
C3
e
100 pF
Note 1:
See related equation for K
w
in Charge Pump Current Specification
Definitions. For this example V
P
e
5.0V. The value of K
w
can then
be approximated using the curves in the Typical Peformance 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
(5 mA/2
q
rad), but in this
case you must convert K
VCO
to (rad/V) multiplying by 2
q
.
TL/W/12339–46
FIGURE 4.
E
20 kHz Loop Filter
http://www.national.com
17
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