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LMX2314 Datasheet(PDF) 16 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2314
Description  1.2 GHz Frequency Synthesizer for RF Personal Communications
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LMX2314 Datasheet(HTML) 16 Page - National Semiconductor (TI)

 
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Application Information (Continued)
Consider the following application example
Example
1
KVCO e 20 MHzV
Kw e 5 mA (Note 1)
RFopt e 900 MHz
Fref e 200 kHz
N e RFopt fref e 4500
0p e 2q 20 kHz e 1256e5
wp e 45
ATTEN e 20 dB
T1 e
secwp b tanwp
0p
e
329eb6
T3 e
010(2020)b1
(2q
 200e3)2
e
2387eb6
0c e
(329eb6 a 2387eb6)
(329eb6 a 2387eb6)2 a 329eb6
 2387eb6

01a(329eb6a2387eb6)
2 a 329eb6  2387eb6
(329eb6 a 2387eb6) 2
b
1
(
e
7045e4
T2 e
1
(7045e4)2
 (329eb6 a 2387eb6)
e
3549eb5
C1 e
329eb6
3549eb5
(5eb3)
 20e6
(7045e4)2
 4500

1 a (7045e4)2
 (3549eb5)2
1 a (7045e4)2
 (329eb6)2 1 a (7045e4)2  (2387eb6)2
(
e
1085 nF
C2 e 1085 nF

355eb5
329eb6
b
1
J e106nF
R2 e
355eb5
106eb9
e
335 kX
if we choose R3 e 22k then C3 e
234eb6
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 33 kX
C2 e 10 nF
R3 e 22 kX
C3 e 100 pF
Note 1
See related equation for Kw in Charge Pump Current Specification
Definitions For this example VP e 50V The value of Kw can then
be approximated using the curves in the Typical Peformance 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
TLW11766 – 20
FIGURE 4 E20 kHz Loop Filter
16


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