LT5525 Datasheet, PDF (1/12 Pages) Linear Technology – High Linearity, Low Power Downconverting Mixer

FEATURES
■ _{Wide Input Frequency Range: 0.8GHz to 2.5GHz*}
■ _{Broadband LO and IF Operation}
■ _{High Input IP3: +17.6dBm at 1900MHz}
■ _{Typical Conversion Gain: –1.9dB at 1900MHz}
■ _{High LO-RF and LO-IF Isolation}
■ _{SSB Noise Figure: 15.1dB at 1900MHz}
■ _{Single-Ended 50Ω RF and LO Interface}
■ _{Integrated LO Buffer: –5dBm Drive Level}
■ _{Low Supply Current: 28mA Typ}
■ _{Enable Function}
■ _{Single 5V Supply}
■ _{16-Lead QFN (4mm × 4mm) Package}
U
APPLICATIO S
■ _{Point-to-Point Data Communication Systems}
■ _{Wireless Infrastructure}
■ _{High Performance Radios}
■ _{High Linearity Receiver Applications}
LT5525
High Linearity, Low Power
Downconverting Mixer
DESCRIPTIO
The LT^®5525 is a low power broadband mixer optimized
for high linearity applications such as point-to-point data
transmission, high performance radios and wireless infra-
structure systems. The device includes an internally 50Ω
matched high speed LO amplifier driving a double-bal-
anced active mixer core. An integrated RF buffer amplifier
provides excellent LO-RF isolation. The RF input balun and
all associated 50Ω matching components are integrated.
The IF ports can be easily matched across a broad range
of frequencies for use in a wide variety of applications.
The LT5525 offers a high performance alternative to
passive mixers. Unlike passive mixers, which require high
LO drive levels, the LT5525 operates at significantly lower
LO input levels and is much less sensitive to LO power
level variations.
, LTC and LT are registered trademarks of Linear Technology Corporation.
*Operation over a wider frequency range is achievable with reduced performance.
Consult factory for more information.
TYPICAL APPLICATIO
High Signal Level Frequency Downconversion
EN
BIAS
V_CC2 V_CC1
0.01µF
100pF
V_CC
5V DC
1900MHz
LNA
1900MHz
RF⁺
RF ^–
140MHz
IF⁺
150nH _4:1
VGA
ADC
1.2pF
IF ^–
150nH
LT5525
GND
LO⁺ LO^–
LO INPUT
–5dBm
5525 TA01
IF Output Power and IM3 vs
RF Input Power (Two Input Tones)
0
–10
–20
–30 ^POUT
–40
–50
–60
–70
–80
–90 ^IM3
–100
–20
T_A = 25°C
f_RF = 1900MHz
f_LO = 1760MHz
f_IF = 140MHz
P_LO = –5dBm
–15
–10
–5
0
RF INPUT POWER (dBm/TONE)
5525 TA02
5525f
1