LTC5599IUFPBF View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LTC5599IUFPBF' PDF : 42 Pages View PDF
LTC5599
Applications Information
carrier, it’s influence can still be significant. For –15dBc
second harmonic content, the side-band suppression can
degrade to –45dBc; for –20dBc it is –54dBc, assuming no
I/Q gain and phase adjustments are made.
RF Output
After upconversion, the RF outputs of the I and Q mixers
are combined. An on-chip buffer performs internal dif-
ferential to single-ended conversion, while transforming
the output signal to 50Ω as shown in Figure 4.
VCC
50Ω
RF 16
Table 7. RF Output Impedance vs Frequency and Digital Gain
Setting (DG) for EN = High (continued)
FREQUENCY
(MHz)
REFL
DG OUTPUT IMPEDANCE (W) COEFFICIENT
(dB) REAL* IMAG* (CAP) MAG ANGLE
600
–16 58 –1.77k (0.15pF) 0.078 –12
600
–18 62 –1.44k (0.18pF) 0.109 –11
600
–19 77 –680 (0.39pF) 0.217 –14
1300
0
48 –802 (0.15pF) 0.035 –119
1300
–12 51 –807 (0.15pF) 0.034 –68
1300
–16 55 –709 (0.17pF) 0.059 –41
1300
–18 59 –526 (0.23pF) 0.098 –35
1300
–19 73 –280 (0.44pF) 0.215 –36
*Parallel Equivalent
The RF port output impedance for EN = Low is given in
Table 8.
Table 8. RF Output Impedance vs Frequency for EN = Low
5599 F04
Figure 4. Simplified Circuit Schematic for the RF Output Port
FREQUENCY
OUTPUT IMPEDANCE (W)
(MHz)
REAL*
IMAG* (CAP)
REFL
COEFFICIENT
MAG ANGLE
Table 7 shows the RF port output impedance vs frequency
and digital gain setting for EN = High.
Table 7. RF Output Impedance vs Frequency and Digital Gain
Setting (DG) for EN = High
FREQUENCY
(MHz)
REFL
DG OUTPUT IMPEDANCE (W) COEFFICIENT
(dB) REAL* IMAG* (CAP) MAG ANGLE
30
0
59 –413 (12.8pF) 0.104 –43
30
–12 61 –465 (11.4pF) 0.114 –35
30
–16 64 –529 (10.0pF) 0.133 –27
30
–18 69
–623 (8.5pF) 0.166 –19
30
–19 83
–902 (5.9pF) 0.249 –10
50
0
56
–671 (4.7pF) 0.068 –38
50
–12 58
–762 (4.2pF) 0.082 –27
50
–16 61
–859 (3.7pF) 0.107 –19
50
–18 67
–972 (3.3pF) 0.146 –13
50
–19 81 –1.21k (2.6pF) 0.239 –8
100
0
55 –1.08k (1.5pF) 0.050 –30
100
–12 57 –1.32k (1.2pF) 0.066 –19
100
–16 60 –1.55k (1.0pF) 0.096 –12
100
–18 66 –1.75k (0.91pF) 0.142 –8
100
–19 82 –1.98k (0.80pF) 0.246 –5
600
0
54 –1.35k (0.20pF) 0.040 –30
600
–12 56 –1.75k (0.15pF) 0.057 –16
30
16.1k
40
16.2k
50
15.7k
60
16.5k
70
16.8k
80
16.4k
90
17.1k
100
17.9k
200
14.7k
250
11.1k
300
8.55k
350
7.97k
400
6.42k
450
5.27k
500
4.26k
600
3.05k
700
2.32k
800
1.85k
900
1.54k
1000
1.30k
1100
1.12k
1200
991
1300
881
*Parallel Equivalent
–7.76k (0.68pF)
–5.24k (0.76pF)
–3.96k (0.80pF)
–3.18k (0.83pF)
–2.66k (0.86pF)
–2.29k (0.87pF)
–2.01k (0.88pF)
–1.79k (0.89pF)
–856 (0.93pF)
–679 (0.94pF)
–563 (0.94pF)
–481 (0.94pF)
–420 (0.95pF)
–373 (0.95pF)
–336 (0.95pF)
–281 (0.94pF)
–241 (0.94pF)
–211 (0.94pF)
–188 (0.94pF)
–169 (0.94pF)
–154 (0.94pF)
–141 (0.94pF)
–129 (0.95pF)
0.994 –0.7
0.994 –1.1
0.994 –1.4
0.994 –1.8
0.994 –2.2
0.994 –2.5
0.994 –2.9
0.994 –3.2
0.993 –6.7
0.991 –8.4
0.988 –10
0.988 –12
0.985 –14
0.982 –15
0.977 –17
0.969 –20
0.959 –23
0.950 –27
0.941 –30
0.932 –33
0.923 –36
0.914 –39
0.906 –42
5599f
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27
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