LTC5540 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC5540' PDF : 16 Pages View PDF
LTC5540
Typical AC Performance Characteristics High-Side LO (continued)
VCC = 3.3V, VCCIF = 3.3V, SHDN = Low, TA = 25°C, PLO = 0dBm, PRF = –3dBm (–3dBm/tone for two-tone IIP3 tests, ∆f = 2MHz),
IF = 190MHz, unless otherwise noted. Test circuit shown in Figure 1.
2-Tone IF Output Power, IM3 and
IM5 vs RF Input Power
20
10
0
–10
IFOUT
–20 RF1 = 899 MHz
–30 RF2 = 901MHz
LO = 1090MHz
–40
–50
–60
IM3
–70
IM5
–80
–12 –9 –6 –3 0
3
6
RF INPUT POWER (dBm/TONE)
5540 G13
Single-Tone IF Output Power, 2 × 2
and 3 × 3 Spurs vs RF Input Power
20
10
0
–10 IFOUT
RF = 900MHz
–20
–30
–40
LO = 1090MHz
3LO–3RF
RF = 1026.67MHz
–50
–60
2LO–2RF
RF = 995MHz
–70
–80
–12 –9 –6 –3 0
3
6
RF INPUT POWER (dBm)
5540 G14
2 × 2 and 3 × 3 Spur Suppression
vs LO Power
–55
RF = 900MHz
PRF = –10dBM
–60
LO = 1090MHz
2LO–2RF
–65
RF = 995MHz
–70
–75
3LO–3RF
RF = 1026.67MHz
–80
–85
–6
–3
0
3
LO INPUT POWER (dBm)
6
5540 G15
SSB Noise Figure
vs RF Blocker Level
24
PLO = –3dBm
22
PLO = 0dBm
PLO = +3dBm
20
PLO = +6dBm
18
16
14
12
10
8
–20
RF = 900MHz
BLOCKER = 800MHz
–15 –10 –5 0
5 10
RF BLOCKER POWER (dBm)
5540 G16
900MHz Conversion
Gain Distribution
45 90°C
40 25°C
–45°C
35
30
25
20
15
10
5
0
6.5
7
7.5
8
8.5
9
GAIN (dB)
5540 G19
LO Switch Isolation
vs LO Frequency
70
65
LO1 SELECTED
60
55
50
LO2 SELECTED
45
40
35
700
800 900 1000 1100 1200 1300
LO FREQUENCY (MHz)
5540 G17
900MHz IIP3 Distribution
35
30
25
90°C
25°C
–45°C
20
15
10
5
0
24 24.5 25 25.5 26 26.5 27 27.5 28
IIP3 (dBm)
5540 G20
Wideband Conversion Gain
vs IF Frequency
10
fRF = 850MHz TO 950MHz
fLO = 1090MHz
9
8
7
6
85°C
25°C
– 40°C
5
140 160 180 200 220 240
IF FREQUENCY (MHz)
5540 G18
900MHz SSB Noise
Figure Distribution
45 90°C
40 25°C
–45°C
35
30
25
20
15
10
5
0
8 8.5 9 9.5 10 10.5 11 11.5 12
NOISE FIGURE (dB)
5540 G21
5540f
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