LT5527EUF Datasheet, PDF (1/16 Pages) Linear Technology – 400MHz to 3.7GHz 5V High Signal Level

FEATURES
n _{50Ω Single-Ended RF and LO Ports}
n _{Wide RF Frequency Range: 400MHz to 3.7GHz*}
n _{High Input IP3: 24.5dBm at 900MHz}
23.5dBm at 1900MHz
n _{Conversion Gain: 3.2dB at 900MHz}
2.3dB at 1900MHz
n _{Integrated LO Buffer: Low LO Drive Level}
n _{High LO-RF and LO-IF Isolation}
n _{Low Noise Figure: 11.6dB at 900MHz}
12.5dB at 1900MHz
n _{Very Few External Components}
n _{Enable Function}
n _{4.5V to 5.25V Supply Voltage Range}
n _{16-Lead (4mm × 4mm) QFN Package}
APPLICATIONS
n _{Cellular, WCDMA, TD-SCDMA and UMTS}
Infrastructure
n _{GSM900/GSM1800/GSM1900 Infrastructure}
n _{900MHz/2.4GHz/3.5GHz WLAN}
n _{MMDS, WiMAX}
n _{High Linearity Downmixer Applications}
LT5527
400MHz to 3.7GHz
5V High Signal Level
Downconverting Mixer
DESCRIPTION
The LT^®5527 active mixer is optimized for high linearity,
wide dynamic range downconverter applications. The
IC includes a high speed differential LO buffer amplifier
driving a double-balanced mixer. Broadband, integrated
transformers on the RF and LO inputs provide single-ended
50Ω interfaces. The differential IF output allows convenient
interfacing to differential IF filters and amplifiers, or is
easily matched to drive 50Ω single-ended, with or without
an external transformer.
The RF input is internally matched to 50Ω from 1.7GHz
to 3GHz, and the LO input is internally matched to 50Ω
from 1.2GHz to 5GHz. The frequency range of both ports
is easily extended with simple external matching. The IF
output is partially matched and usable for IF frequencies
up to 600MHz.
The LT5527’s high level of integration minimizes the total
solution cost, board space and system-level variation.
L, LT, LTC and LTM 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 APPLICATION
High Signal Level Downmixer for Multi-Carrier Wireless Infrastructure
LO INPUT
–3dBm (TYP)
LT5527
RF
INPUT
RF
BIAS
GND EN ^VCC2 ^VCC1
1nF
4.7pF
IF⁺
100nH
1nF
220nH
4.7pF
IF^–
100nH
5V
1μF
5527 TA01a
IF
OUTPUT
240MHz
1.9GHz Conversion Gain, IIP3, SSB NF and
LO-RF Leakage vs LO Power
24
22 IIP3
20
18
16
14
12 SSB NF
10
8
6
4 _GC
2
–9 –7
–20
–25
–30
IF = 240MHz
LOW SIDE LO ^–35
T_A = 25°C
–40
V_CC = 5V
–45
–50
–55
LO-RF ^–60
–65
–70
–5 –3 –1
LO POWER (dBm)
–75
1
3
5527 TA01b
5527fa
1