LT5518 데이터 시트보기 (PDF) - Linear Technology
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LT5518 Datasheet PDF : 16 Pages
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BLOCK DIAGRA
BBPI 14
V-I
BBMI 16
BBPQ 7
V-I
BBMQ 5
VCC
8 13
LT5518
0°
90°
BALUN
11 RF
1 EN
2469
GND
3
10 12 15 17
5518 BD
LO
GND
LT5518
APPLICATIO S I FOR ATIO
The LT5518 consists of I and Q input differential voltage-
to-current converters, I and Q up-conversion mixers, an
RF output balun, an LO quadrature phase generator and
LO buffers.
External I and Q baseband signals are applied to the dif-
ferential baseband input pins, BBPI, BBMI, and BBPQ,
BBMQ. These voltage signals are converted to currents and
translated to RF frequency by means of double-balanced
up-converting mixers. The mixer outputs are combined
in an RF output balun, which also transforms the output
impedance to 50Ω. The center frequency of the resulting
RF signal is equal to the LO signal frequency. The LO in-
put drives a phase shifter which splits the LO signal into
in-phase and quadrature LO signals. These LO signals
are then applied to on-chip buffers which drive the up-
conversion mixers. Both the LO input and RF output are
single-ended, 50Ω-matched and AC coupled.
RF
VCC = 5V
C
BALUN
LOMI
LT5518
FROM
Q
LOPI
BBPI
BBMI
200Ω
1.8pF
1.3k
1.8pF
1.3k
200Ω
VREF = 500mV
CM
GND
5518 F01
Figure 1. Simplified Circuit Schematic of the LT5518 (Only I-Half is Drawn)
5518f
7
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