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LTC5598 Datasheet(PDF) 13 Page - Linear Technology

Part # LTC5598
Description  5MHz to 1600MHz High Linearity Direct Quadrature Modulator
PDF  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC5598 Datasheet(HTML) 13 Page - Linear Technology

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LTC5598
13
5598f
Table 7. RF Output Impedance vs Frequency for EN = High
FREQUENCY
(MHz)
RF OUTPUT
IMPEDANCE
REFLECTION COEFFICIENT
MAG
ANGLE
0.1
59.0 – j0.6
0.083
–3.6
1
58.5 – j2.1
0.081
–12.7
2
57.3 – j3.5
0.076
–23.6
4
54.6 – j4.5
0.061
–41.6
8
51.9 – j3.6
0.040
–60.8
16
50.5 – j2.1
0.022
–74.8
30
50.2 – j1.1
0.011
–80
60
50 – j0.5
0.005
–86.5
100
50 – j0.2
0.002
–84.9
200
49.7 + j0
0.003
177.4
400
48.9 + j0.3
0.011
162
800
46.1 + j0.4
0.041
173.3
1000
44.5 + j0.2
0.058
178
1250
42.8 + j0
0.077
–179.7
1500
41.2 – j0.1
0.097
–179.4
1800
39.9 + j0.4
0.113
177.4
The RF port output impedance for EN = Low is given in Table
8. It is roughly equivalent to a 1.3pF capacitor to ground.
Table 8. RF Output Impedance vs Frequency for EN = Low
FREQUENCY
(MHz)
LO INPUT
IMPEDANCE
REFLECTION COEFFICIENT
MAG
ANGLE
100
82.3 – j1223
0.995
–4.6
200
51.1 – j618
0.987
–9.2
400
35.3 – j310
0.965
–18.1
800
24.4 – j148
0.906
–36.6
1000
20.4 – j114
0.878
–46.4
1250
17 – j87
0.847
–58.4
1500
14.7 – j68
0.818
–70.7
1800
13.1 – j54
0.785
–84.3
In Figure 7 the simplified circuit schematic of the RF
output buffer is drawn. A plot of the RF port return loss vs
frequency is drawn in Figure 8 for EN = High and Low.
Enable Interface
Figure 9 shows a simplified schematic of the EN pin
interface. The voltage necessary to turn on the LTC5598
is 2V. To disable (shut down) the chip, the enable voltage
must be below 1V. If the EN pin is not connected, the chip
is enabled. This EN = High condition is assured by the 125k
on-chip pull-up resistor. It is important that the voltage at
the EN pin does not exceed VCC by more than 0.3V. Should
APPLICATIONS INFORMATION
RF
1k
1.8V
4.6V
48Ω
48Ω
1k
1V
2.8V
FROM
INTERNAL
MIXERS
INTERNAL
BIAS
5598 F07
VCC2
Figure 7. Simplified Circuit Schematic of the RF Output
FREQUENCY (MHz)
1
–10
–30
–20
–40
100
1000
10
–60
–50
0
5598 F08
EN = LOW
EN = HIGH
C6 = 220nF, SEE FIGURE 10
Figure 8. RF Port Return Loss vs Frequency
EN
VCC1
125k
50k
2V
3V
INTERNAL
ENABLE
CIRCUIT
5598 F09
Figure 9: EN Pin Interface



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