LTC5586
6GHz High Linearity
I/Q Demodulator with
Wideband IF Amplifier
FeaTures
DescripTion
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300MHz to 6GHz Operating Frequency
The LTC®5586 is a direct conversion quadrature demod-
ulator optimized for high linearity zero-IF and low IF
receiver applications in the 300MHz to 6GHz frequency
range. The very wide IF bandwidth of more than 1GHz
makes the LTC5586 particularly suited for demodulation
of very wideband signals, especially in digital predistor-
tion (DPD) applications. The outstanding dynamic range
of the LTC5586 makes the device suitable for demanding
infrastructure direct conversion applications. Proprietary
technology inside the LTC5586 provides the capability
to optimize OIP2 to 80dBm, and achieve image rejection
better than 60dB. The DC offset control function allows
nulling of the DC offset at the A/D converter input, thereby
optimizing the dynamic range of true zero-IF receivers
that use DC coupled IF signal paths. The wideband RF
and LO input ports make it possible to cover all the major
wireless infrastructure frequency bands using a single
device. The IF outputs of the LTC5586 are designed to
interface directly with most common A/D converter input
interfaces. The high OIP3 and high conversion gain of the
device eliminate the need for additional amplifiers in the
IF signal path.
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Wide IF Bandwidth: DC to 1GHz (–1dB Bandwidth)
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High Mixer IIP3: 30dBm at 1.9GHz
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High Total OIP3: 40dBm at 1.9GHz
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High Total OIP2: 74dBm at 1.9GHz
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User Adjustable OIP2 to 80dBm
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User Adjustable Image Rejection to 60dB
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User Adjustable DC Offset Null
Serial Interface
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Power Conversion Gain: 7.7dB at 1.9GHz
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31dB RF Attenuator with 1dB Step Size
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RF Switch with 40dB Isolation at 1.9GHz
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Single-Ended RF Inputs with On-Chip Transformer
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IF Amplifier Gain Adjustable in 8 Steps
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Operating Temperature Range (T ): –40°C to 105°C
C
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32-Lead 5mm × 5mm QFN Package
applicaTions
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4G and 5G Base Station Receivers
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Wideband DPD Receivers
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Point-To-Point Broadband Radios
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High Linearity Direct Conversion I/Q Receivers
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Analog
Devices, Inc. All other trademarks are the property of their respective owners.
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Image Rejection Receivers
Typical applicaTion
Gain, OIP3 and OIP2 vs Temperature (TC)
(Unoptimized)
Dual Band Transmitter with DPD Receiver
90
OIP2
80
RF
1
PA
1
70
60
50
LTC5586
IFIP
OIP3
ADC
40
30
20
10
0
RFA
IFIM
8 STEPS
RFB
0º
GAIN
f
LO
90º
RFSW
8 STEPS
IFQP
ATTEN
0dB – 31dB
-10
0
1
2
3
4
5
6
SPI
ADC
RF FREQUENCY (GHz)
IFQM
5586 G01
I, 105°C
I, 85°C
I, 25°C
I, –40°C
Q, 105°C
Q, 85°C
Q, 25°C
Q, –40°C
RF
2
PA
2
5586 TA01
5586fa
1
For more information www.linear.com/LTC5586