LT5519_15 Datasheet, PDF (1/12 Pages) Linear Technology – 0.7GHz to 1.4GHz High Linearity Upconverting Mixer

FEATURES
s _{Wide RF Frequency Range: 0.7GHz to 1.4GHz}
s _{17.1dBm Typical Input IP3 at 1GHz}
s _{On-Chip RF Output Transformer}
s _{On-Chip 50Ω Matched LO and RF Ports}
s _{Single-Ended LO and RF Operation}
s _{Integrated LO Buffer: –5dBm Drive Level}
s _{Low LO to RF Leakage: – 44dBm Typical}
s _{Noise Figure: 13.6dB}
s _{Wide IF Frequency Range: 1MHz to 400MHz}
s _{Enable Function with Low Off-State Leakage Current}
s _{Single 5V Supply}
s _{Small 16-Lead QFN Plastic Package}
U
APPLICATIO S
s _{Wireless Infrastructure}
s _{Cable Downlink Infrastructure}
s _{Point-to-Point and Point-to-Multipoint Data}
Communications
s _{High Linearity Frequency Conversion}
LT5519
0.7GHz to 1.4GHz
High Linearity
Upconverting Mixer
DESCRIPTIO
The LT^®5519 mixer is designed to meet the high linearity
requirements of wireless and cable infrastructure trans-
mission systems. A high speed, internally 50Ω 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 LT5519 mixer delivers +17.1dBm typical input 3rd
order intercept point at 1GHz with IF input signal levels of
–10dBm. The input 1dB compression point is typically
+5.5dBm. The IC requires only a single 5V supply.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
5V_DC
1µF
1000pF
39nH
EN
V_CC1 V_CC2 V_CC3
BPF
220pF ^100Ω
BIAS
4:1
IF⁺
33pF
220pF
IF ^–
100Ω
LT5519
10pF
RF⁺
BPF
RF ^–
PA
(OPTIONAL)
LO INPUT
–5dBm
5pF
LO⁺
85Ω
5pF
LO^–
GND
5519 F01a
RF Output Power, IM3 and IM2
vs IF Input Power (Two Input Tones)
10
0
P_OUT
–10
–20
f_RF = 1000MHz
–30 P_LO = –5dBm
–40
f_LO = 1140MHz
f_IF1 = 140MHz
–50 ^fIF2 ^{= 141MHz}
IM3
T_A = 25°C
–60
IM2
–70
–80
–90
–16 –12 –8
–4
0
4
IF INPUT POWER (dBm/TONE)
5519 F01b
Figure 1. Frequency Conversion in Wireless Infrastructure Transmitter
5519f
1