LMX2541 Datasheet, PDF (20/64 Pages) National Semiconductor (TI) – Ultra-Low Noise PLLatinum Frequency Synthesizer with Integrated VCO

LMX2541SQ2060E, LMX2541SQ2380E
LMX2541SQ2690E, LMX2541SQ3030E
LMX2541SQ3320E, LMX2541SQ3740E
SNOSB31I – JULY 2009 – REVISED FEBRUARY 2013
www.ti.com
Table 5. RFout Output Impedance vs. OUTTERM (Bypass Mode)⁽¹⁾
Freq.
(MHz)
50
100
200
400
600
800
1000
1200
1400
1600
1800
2000
2200
2400
2600
2800
3000
3200
3400
3600
3800
4000
4200
4400
4600
4800
5000
OUTTERM=3
Real Imaginary
27.9
1.6
28.5
2.8
29.2
3.8
28.8
5.7
28.8
8.8
29.1
11.7
28.6
13.4
28.0
15.0
27.5
16.7
27.0
18.4
26.4
20.1
25.9
21.8
25.3
23.5
23.1
26.9
20.1
29.3
18.5
34.2
16.6
40.6
16.5
47.0
17.1
53.8
20.8
59.4
22.0
64.9
23.0
70.0
23.7
77.9
23.7
93.2
27.3
107.4
40.1
126.6
61.4
142.8
OUTTERM=6
Real Imaginary
16.2
1.9
16.7
3.6
18.1
5.9
19.2
9.5
20.4
13.7
22.5
17.5
22.8
19.2
23.1
20.9
23.3
22.7
23.6
24.4
23.9
26.1
24.1
27.9
24.4
29.6
22.9
33.2
20.5
35.4
19.6
40.4
18.1
46.9
18.9
53.4
20.4
60.1
25.4
65.0
27.3
69.7
28.1
74.9
28.6
82.8
30.1
98.0
36.6
112.0
52.2
129.8
76.2
143.3
OUTTERM=9
Real Imaginary
12.3
1.8
12.7
3.6
14.0
6.3
15.3
10.3
16.5
14.9
18.7
19.2
19.3
21.2
19.8
23.2
20.4
25.2
20.9
27.2
21.4
29.2
22.0
31.1
22.5
33.1
21.3
37.1
19.3
39.6
18.8
45.0
17.8
51.9
19.3
58.9
21.8
65.8
28.3
70.5
31.1
74.6
32.1
80.0
32.8
87.7
35.4
102.9
44.8
116.3
63.3
132.3
89.5
142.3
OUTTERM=12
Real Imaginary
9.5
1.7
9.8
3.6
10.9
6.5
12.4
11.0
13.7
15.7
15.8
20.3
16.5
22.5
17.1
24.7
17.7
26.9
18.4
29.0
19.0
31.2
19.6
33.4
20.3
35.6
19.0
40.1
17.2
42.9
17.0
49.0
16.3
56.5
18.4
64.2
21.7
71.8
30.2
76.8
34.1
80.5
35.5
86.4
37.0
94.2
42.3
109.4
54.3
122.2
76.7
135.9
105.5
141.0
TERM=15
Real Imaginary
7.8
1.7
8.0
3.5
9.0
6.6
10.6
11.2
11.9
16.0
14.0
20.8
14.6
23.1
15.2
25.4
15.8
27.7
16.5
30.0
17.1
32.3
17.7
34.6
18.3
36.9
17.0
41.8
15.1
44.9
14.8
51.6
14.3
59.7
16.7
68.2
20.4
76.6
30.3
82.5
35.4
86.1
37.6
92.0
39.9
100.9
47.8
116.6
62.6
128.9
89.3
140.5
121.0
140.5
(1) The VCO divider was bypassed (VCO_DIV = 1) and the RFout pin was enabled. The VCOGAIN word was set to 12.
20
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