LTC5569_15 Datasheet, PDF (1/22 Pages) Linear Technology – 300MHz to 4GHz 3.3V Dual Active Downconverting Mixer

FEATURES
n _{High IIP3: 26.8dBm at 1950MHz}
n _{2dB Conversion Gain}
n _{Low Noise Figure: 11.7dB at 1950MHz}
n _{17dB NF Under 5dBm Blocking}
n _{44dB Channel Isolation}
n _{Low Power: 3.3V/600mW Total}
n _{Very Small Solution Size}
n _{Enable Pins for Each Mixer}
n _{Wide IF Frequency Range}
n _{LO Input 50Ω Matched in All Modes}
n _{–40°C to 105°C Operation}
n _{16-Lead (4mm × 4mm) QFN package}
APPLICATIONS
n _{Wireless Infrastructure Diversity Receivers}
n _{MIMO Infrastructure Receivers}
n _{Remote Radio Units}
LTC5569
300MHz to 4GHz
3.3V Dual Active
Downconverting Mixer
DESCRIPTION
The LTC^®5569 dual active downconverting mixer is opti-
mized for diversity and MIMO receiver applications that
require low power and small size. Each mixer includes an
independent LO buffer amplifier, active mixer core, and
bias circuit with enable pin. The symmetry of the IC as-
sures that a phase and amplitude coherent LO is applied
to each mixer.
The RF inputs are 50Ω matched from 1.4GHz to 3.3GHz,
and easily matched for higher or lower RF frequencies with
simple external matching. The LO input is 50Ω matched
from 1GHz to 3.5GHz, even when one or both mixers are
disabled. The LO input is easily matched for higher or
lower frequencies, as low as 350MHz, with simple external
matching. The low capacitance differential IF outputs are
usable up to 1.6GHz.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Diversity Receiver with 190MHz Bandpass IF Matching
1nF _190MHz
10nF
RF
MAIN
2.7pF
RFA
270nH
IFA⁺
RF
270nH ^1nF
IFA^–
V_CCA
3.3V
10nF
ENA
BIAS
ENA
3.9pF _LO
LO
LO
RF
DIVERSITY 2.7pF
RFB
LTC5569
LO
RF
IFB⁺
10nF _270nH
IFB^–
270nH
ENB
BIAS
V_CCB
1nF _190MHz
ENB
3.3V
10nF
BPF
DUAL
IF VGA
DUAL
ADC
BPF
5569 TA01a
1nF
Mixer Conversion Gain, IIP3 and NF
vs IF Output Frequency
5.0
4.5
4.0
RF = 1950 ±50MHz
LO = 1760MHz
3.5 ^PLO ^{= 0dBm}
Z_RF = 50Ω
3.0 Z_IF = 50Ω
T_C = 25°C
2.5 _{TEST CIRCUIT IN FIGURE 1}
2.0
±30MHz
1.5
28
IIP3 ₂₆
24
22
20
18
G_{C 16}
14
1.0
NF ₁₂
0.5
10
140 150 160 170 180 190 200 210 220 230 240
IF OUTPUT FREQUENCY (MHz)
5560 TA01b
For more information www.linear.com/LTC5569
5569fb
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