LT5526_15 Datasheet, PDF (1/16 Pages) Linear Technology – High Linearity, Low Power Downconverting Mixer

FEATURES
■ _{Operation up to 2GHz}
■ _{Broadband RF, LO and IF Operation}
■ _{High Input IP3: +16.5dBm at 900MHz}
■ _{Typical Conversion Gain: 0.6dB at 900MHz}
■ _{SSB Noise Figure: 11dB at 900MHz}
■ _{On-Chip 50Ω LO Match}
■ _{Integrated LO Buffer: –5dBm Drive Level}
■ _{High LO-RF and LO-IF Isolation}
■ _{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}
■ _{Cable Downlink Infrastructure}
■ _{High Linearity Receiver Applications}
LT5526
High Linearity, Low Power
Downconverting Mixer
DESCRIPTIO
The LT^®5526 is a low power broadband mixer optimized
for high linearity applications such as point-to-point data
transmission, cable infrastructure and wireless infrastruc-
ture systems. The device includes an internally matched
high speed LO amplifier driving a double-balanced active
mixer core. An integrated RF buffer amplifier provides
excellent LO-RF isolation. The RF and IF ports can be easily
matched across a broad range of frequencies for use in a
wide variety of applications.
The LT5526 offers a high performance alternative to
passive mixers. Unlike passive mixers which have conver-
sion loss and require high LO drive levels, the LT5526
delivers conversion gain 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.
TYPICAL APPLICATIO
High Signal Level Frequency Downconversion
900MHz
LNA
900MHz
EN
BIAS
V_CC2 V_CC1
RF⁺
IF⁺
RF ^–
IF ^–
V_CC
5V DC
140MHz
VGA
ADC
LT5526
GND
LO⁺ LO^–
LO INPUT
–5dBm
5526 TA01
IF Output Power and IM3 vs
RF Input Power (Two Input Tones)
0
–10
–20
P_OUT
–30
–40
–50
–60
–70
–80 _IM3
–90
–100
–20
T_A = 25°C
f_IF = 140MHz
f_RF = 900MHz
f_LO = 760MHz
P_LO = –5dBm
–15
–10
–5
0
RF INPUT POWER (dBm/TONE)
5526 TA02
5526f
1