LMX2541 Datasheet, PDF (17/64 Pages) National Semiconductor (TI) – Ultra-Low Noise PLLatinum Frequency Synthesizer with Integrated VCO

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LMX2541SQ2060E, LMX2541SQ2380E
LMX2541SQ2690E, LMX2541SQ3030E
LMX2541SQ3320E, LMX2541SQ3740E
SNOSB31I – JULY 2009 – REVISED FEBRUARY 2013
Table 2. Change in Output Power in Bypass Mode as a Function of VCOGAIN and OUTTERM
3
6
OUTTERM
9
12
15
VCOGAIN
3
6
9
12
15
-9.7
-8.4
-7.9
-7.8
-7.9
-6.6
-4.5
-3.6
-3.4
-3.6
-5.7
-3.1
-1.7
-1.3
-1.3
-5.4
-2.5
-0.8
+0.0
+0.1
-5.3
-2.2
-0.3
+0.8
+1.1
Output Power
vs.
Voltage
(VCO_DIV > 1, DIVGAIN = 12, OUTTERM = 12,
T_A
= 25°C
(1)₎
9
Vcc = 3.3 V
8
7
6
Vcc = 3.45 V
5
4
3
2
1 _{Vcc = 3.15 V}
0
-1
0
500 1000 1500 2000
FREQUENCY (MHz)
2500
Figure 17.
Output Power
vs.
OUTTERM and FREQUENCY
(VCO_DIV
>
1,
T_A
=
25
°C, Vcc
(1) ₎
=
3.3
V,
DIVGAIN
=
12
10
OUTTERM=15
8
OUTTERM=12
6
4
OUTTERM=6
2
0
OUTTERM=9
-2
-4
-6
OUTTERM=3
-8
-10
0
500 1000 1500 2000 2500
FREQUENCY (MHz)
Figure 18.
Output Power
vs.
Temperature
( VCO_DIV > 1, DIVGAIN = OUTTERM = 12,
Vcc = 3.3 V
(1) ₎
9
8
7
6
5
4
3
T_A = 25^o C
T_A = -40^o C
2
1
T_A = 85^o C
0
-1
0
500 1000 1500 2000 2500
FREQUENCY (MHz)
Figure 19.
Output Power
vs.
DIVGAIN and FREQUENCY
(1)_{(VCO_DIV > 1, TA = 25 °C, Vcc = 3.3 V, OUTTERM = 12 )}
10
DIVGAIN=15
8
DIVGAIN=12
6
4
2
0
-2
DIVGAIN=6
-4
DIVGAIN=9
-6
-8
-10
0
DIVGAIN=3
500 1000 1500 2000
FREQUENCY (MHz)
2500
Figure 20.
Table 3. Change in Output Power in Divided Mode as a Function of DIVGAIN and OUTTERM⁽¹⁾
DIVGAIN
3
6
9
12
15
(1) The measurement of the output power is sensitive to the test circuit. All the numbers in the electrical specifications and typical
performance curves were obtained from a characterization setup that accommodate temperature testing and changing of parts. In a
more optimized setup the measured RF output power is typically on the order of 1.5 to 2.4 dB higher.
(1) The table shows the RELATIVE output power to the case of VCOGAIN = OUTTERM = 12.
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Product Folder Links: LMX2541SQ2060E LMX2541SQ2380E LMX2541SQ2690E LMX2541SQ3030E
LMX2541SQ3320E LMX2541SQ3740E