LT5520 Datasheet, PDF (1/12 Pages) Linear Technology – 1.3GHz to 2.3GHz High Linearity Upconverting Mixer

LT5520
1.3GHz to 2.3GHz
High Linearity
Upconverting Mixer
FEATURES
s _{Wide RF Output Frequency Range: 1.3GHz}
to 2.3GHz
s _{15.9dBm Typical Input IP3 at 1.9GHz}
s _{On-Chip RF Output Transformer}
s _{No External LO or RF Matching Required}
s _{Single-Ended LO and RF Operation}
s _{Integrated LO Buffer: –5dBm Drive Level}
s _{Low LO to RF Leakage: – 41dBm Typical}
s _{Wide IF Frequency Range: DC to 400MHz}
s _{Enable Function with Low Off-State Leakage Current}
s _{Single 5V Supply}
s _{Small 16-Lead QFUN Plastic Package}
APPLICATIO S
s _{Wireless Infrastructure}
s _{Cable Downlink Infrastructure}
s _{Point-to-Point Data Communications}
s _{High Linearity Frequency Conversion}
DESCRIPTIO
The LT^®5520 mixer is designed to meet the high linearity
requirements of wireless and cable infrastructure trans-
mission applications. A high-speed, internally matched,
LO amplifier drives a double-balanced mixer core, allow-
ing the use of a low power, single-ended LO source. An RF
output transformer is integrated, thus eliminating the
need for external matching components at the RF output,
while reducing system cost, component count, board area
and system-level variations. The IF port can be easily
matched to a broad range of frequencies for use in many
different applications.
The LT5520 mixer delivers 15.9dBm typical input 3rd
order intercept point at 1.9GHz with IF input signal levels
of –10dBm. The input 1dB compression point is typically
4dBm. The IC requires only a single 5V supply.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V_DC
IF
INPUT
1µF
1000pF
39nH
EN
V_CC1 V_CC2 V_CC3
BPF
220pF ^100Ω
BIAS
4:1
IF⁺
15pF
10pF
RF⁺
220pF
IF ^–
100Ω
RF ^–
PA
BPF
RF
OUTPUT
(OPTIONAL)
LO INPUT
–5dBm
5pF
85Ω
LO⁺
GND
5pF
LO^–
LT5520
5520 F01
RF Output Power and Output IM3 vs
IF Input Power (Two Input Tones)
10
0
–10
–20
–30
–40
–50
–60
–70
–80
–90
–16
P_OUT
P_LO = –5dBm
IM3
f_LO = 1760MHz
f_IF1 = 140MHz
f_IF2 = 141MHz
f_RF = 1900MHz
T_A = 25°C
–12 –8
–4
0
4
IF INPUT POWER (dBm/TONE)
5520 • F01b
Figure 1. Frequency Conversion in Wireless Infrastructure Transmitter
5520f
1