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LTC5591 Datasheet(PDF) 17 Page - Linear Technology

Part # LTC5591
Description  Dual 1.6GHz to 2.7GHz High Dynamic Range Downconverting Mixer
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC5591 Datasheet(HTML) 17 Page - Linear Technology

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LTC5592
17
5592f
APPLICATIONS INFORMATION
Table 4. Performance Comparison with VCCIF = 3.3V and 5V
(RF = 1950MHz, High Side LO, IF = 190MHz)
VCCIF
(V)
R2A
(Ω)
ICCIF
(mA)
GC
(dB)
P1dB
(dBm)
IIP3
(dBm)
NF
(dB)
3.3
Open
202
8.7
10.6
25.4
9.8
1k
202
7.5
11.3
25.4
9.9
5
Open
209
8.7
14.0
25.5
9.9
(RF = 2350MHz, Low Side LO, IF = 190MHz)
VCCIF
(V)
R2A
(Ω)
ICCIF
(mA)
GC
(dB)
P1dB
(dBm)
IIP3
(dBm)
NF
(dB)
3.3
Open
202
8.3
11.0
27.3
9.8
1k
202
7.1
11.8
27.5
9.8
5
Open
209
8.1
14.6
28.0
10.0
The IFBA pin (Pin 20) is available for reducing the DC
current consumption of the IF amplifier, at the expense of
IIP3. The nominal DC voltage at Pin 20 is 2.1V, and this pin
should be left open-circuited for optimum performance.
The internal bias circuit produces a 4mA reference for the
IF amplifier, which causes the amplifier to draw approxi-
mately 101mA. If resistor R1A is connected to Pin 20 as
shown in Figure 7, a portion of the reference current can
be shunted to ground, resulting in reduced IF amplifier
current. For example, R1A = 1k will shunt away 1.5mA
from Pin 20 and the IF amplifier current will be reduced
by 25% to approximately 75.5mA. Table 5 summarizes
RF performance versus IF amplifier current.
Table 5. Mixer Performance with Reduced IF Amplifier Current
RF = 1950MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
R1
ICCIF
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Open
202
8.7
25.4
10.6
9.8
4.7kΩ
184
8.5
25.2
10.8
9.8
2.2kΩ
170
8.4
24.8
10.9
9.7
1kΩ
151
8.1
24.4
11.1
9.8
RF = 2350MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
R1
ICCIF
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Open
202
8.3
27.3
11.0
9.8
4.7kΩ
184
8.1
26.8
11.2
9.8
2.2kΩ
170
8.0
26.2
11.2
9.8
1kΩ
151
7.7
25.4
11.3
9.8
Low Power Mode
Both mixer channels can be set to low power mode us-
ing the ISEL pin. This allows flexibility to select a reduced
current mode of operation when lower RF performance is
acceptable, reducing power consumption by 37%. Figure
12 shows a simplified schematic of the ISEL pin interface.
When ISEL is set low (<0.3V), both channels operate at
nominal DC current. When ISEL is set high (>2.5V), the DC
current in both channels is reduced, thus reducing power
consumption. The performance in low power mode and
normal power mode are compared in Table 6.
Figure 12. ISEL Interface Schematic
Table 6. Performance Comparison Between Different Power Modes
RF = 1950MHz, High Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
ISEL
ITOTAL
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Low
401
8.7
25.4
10.6
9.8
High
252
7.4
21.2
10.9
10.2
RF = 2350MHz, Low Side LO, IF = 190MHz, VCC = VCCIF = 3.3V
ISEL
ITOTAL
(mA)
GC
(dB)
IIP3
(dBm)
P1dB
(dBm)
NF
(dB)
Low
401
8.3
27.3
11.0
9.8
High
252
7.1
22.3
11.3
10.2
LTC5592
18
ISEL
VCCB
500Ω
VCCA
5592 F13
19
BIAS A
BIAS B



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