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參數(shù)資料
| 型號： | LMX1501MDA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 1100 MHz, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 9/25頁 |
| 文件大小： | 410K |
| 代理商： | LMX1501MDA |
Application Information (Continued)
Example
1
KVCO e 193 MHzV
Kw e 5 mA (Note 1)
RFopt e 886 MHz
Fref e 25 kHz
N e RFopt fref e 35440
0p e 2q 5 kHz e 31415e4
wp e 43
ATTEN e 10 dB
T1 e
secwp b tanwp
0p
e
138eb5
T3 e
010(1020)b1
(2q
25e3)2
e
9361eb6
0c e
(tan 43 )
(138eb5 a 9361eb6)
(138eb5 a 9361eb6)2 a 138eb5
9361eb6
01a(138eb5a9361eb6)
2 a 138eb5 9361eb6
(tan 43 )
(138eb5 a 9361eb6) 2
b
1
(
e
18101e4
T2 e
1
(18101e4)2
(138eb5 a 9361eb6)
e
1318eb4
C1 e
138eb5
1318eb4
(5eb3)
193e6
(18101e4)2
(35440)
1 a (18101e4)2
(1318eb4)2
1 a (18101e4)2
(138eb5)2 1 a (18101e4)2 (9361eb6)2
(
e
2153 nF
C2 e 2153 nF
1318eb4
1384eb5
b
1
J e1835nF
R2 e
1318eb4
1835eb9
e
718 kX
if we choose R3 e 120k then C3 e
9361eb6
120e3
e
78 pF
Converting to standard component values gives the follow-
ing filter values which are shown in
Figure 4
C1 e 2200 pF
R2 e 82 kX
C2 e 0018 mF
R3 e 120 kX
C3 e 78 pF
Note 1
See related equation for Kw in Charge Pump Current Specification
Definitions For this example VP e 50V The value for Kw can then
be approximated using the curves in the Typical Performance Char-
acteristics for Charge Pump Current vs Do Voltage The units for Kw
are in mA You may also use Kw e (5 mA2q rad) but in this case
you must convert KVCO to (radV) multiplying by 2q
TLW12340 – 41
FIGURE 4 E5 kHz Loop Filter
17
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