LT5522 Datasheet, PDF (1/16 Pages) Linear Technology – 400MHz to 2.7GHz High Signal Level Downconverting Mixer

FEATURES
■ _{Internal On-Chip RF Input Transformer}
■ _{50Ω Single-Ended RF and LO Ports}
■ _{High Input IP3: +25dBm at 900MHz}
+21.5dBm at 1900MHz
■ _{Low Power Consumption: 280mW Typical}
■ _{Integrated LO Buffer: Low LO Drive Level}
■ _{High LO-RF and LO-IF Isolation}
■ _{Wide RF Frequency Range: 0.4GHz to 2.7GHz*}
■ _{Very Few External Components}
■ _{Enable Function}
■ _{4.5V to 5.25V Supply Voltage Range}
■ _{16-Lead (4mm × 4mm) QFN Package}
U
APPLICATIO S
■ _{Cellular, PCS and UMTS Band Infrastructure}
■ _{CATV Downlink Infrastructure}
■ _{2.4GHz ISM}
■ _{High Linearity Downmixer Applications}
LT5522
400MHz to 2.7GHz
High Signal Level
Downconverting Mixer
DESCRIPTIO
The LT^®5522 active downconverting mixer is optimized for
high linearity downconverter applications including cable
and wireless infrastructure. The IC includes a high speed
differential LO buffer amplifier driving a double-balanced
mixer. The LO buffer is internally matched for wideband,
single-ended operation with no external components.
The RF input port incorporates an integrated RF trans-
former and is internally matched over the 1.2GHz to 2.3GHz
frequency range with no external components. The RF
input match can be shifted down to 400MHz, or up to
2.7GHz, with a single shunt capacitor or inductor, respec-
tively. The high level of integration minimizes the total
solution cost, board space and system-level variation.
The LT5522 delivers high performance and small size
without excessive power consumption.
, LTC and LT are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Operation over a wider frequency range is possible with reduced performance.
Consult factory for information and assistance.
TYPICAL APPLICATIO
LT5522
LO INPUT
–5dBm
LO⁺
LO^–
1850MHz
TO
1910MHz
LNA
IF⁺
RF⁺
RF^–
EN
BIAS/
CONTROL
V_CC1
IF^–
V_CC2
0.01µF
2.7pF
100pF
140MHz
150nH ^(TYP)
VGA
150nH
LTC1748
ADC
5522 F01
5V
3.3µF
Figure 1. High Signal Level Downmixer for Wireless Infrastructure
1.9GHz Conversion Gain, IIP3, SSB
NF and LO-RF Leakage vs LO Power
24
22
20
18
16
14
12
10
8
6
4
2
0
–11
–10
IIP3
–20
–30
SSB NF
–40
LO-RF
–50
IF = 140MHz
LOW-SIDE LO –60
T_A = 25°C
V_CC = 5V
–70
–9 –7 –5 –3 –1 1
LO INPUT POWER (dBm)
5522 TA01
5522fa
1