LT5528 LINER [Linear Technology], LT5528 Datasheet
LT5528
Manufacturer Part Number
LT5528
Description
1.5GHz to 2.4GHz High Linearity Direct Quadrature Modulator
Manufacturer
LINER [Linear Technology]
Datasheet
1.LT5528.pdf
(16 pages)
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APPLICATIO S
FEATURES
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TYPICAL APPLICATIO
Direct Conversion to 1.5GHz to 2.4GHz
High OIP3: 21.8dBm at 2GHz
Low Output Noise Floor at 5MHz Offset:
4-Ch W-CDMA ACPR: –66dBc at 2.14GHz
Integrated LO Buffer and LO Quadrature Phase
Generator
50Ω AC-Coupled Single-Ended LO and RF Ports
50Ω DC Interface to Baseband Inputs
Low Carrier Leakage: –42dBm at 2GHz
High Image Rejection: 45dB at 2GHz
16-Lead QFN 4mm × 4mm Package
Infrastructure Tx for DCS, PCS and UMTS Bands
Image Reject Up-Converters for PCS and UMTS
Bands
Low-Noise Variable Phase-Shifter for 1.5GHz to
2.4GHz Local Oscillator Signals
ADC
BASEBAND
No RF: –159.3dBm/Hz
P
DSP
OUT
Q-DAC
I-DAC
= 4dBm: –151.8dBm/Hz
1.5GHz to 2.4GHz Direct Conversion Transmitter Application
EN
with LO Feed-Through and Image Calibration Loop
2, 4, 6, 9, 10, 12, 15, 17
U
14
16
1
7
5
Q-CHANNEL
V-I
V-I
I-CHANNEL
90°
VCO/SYNTHESIZER
0°
U
V
CC
8, 13
3
BALUN
LT5528
11
CAL
LO FEED-THROUGH CAL OUT
IMAGE CAL OUT
5V
PA
DESCRIPTIO
The LT
performance wireless applications, including wireless
infrastructure. It allows direct modulation of an RF signal
using differential baseband I and Q signals. It supports
PHS, GSM, EDGE, TD-SCDMA, CDMA, CDMA2000,
W-CDMA and other systems. It may also be confi gured
as an image reject up-converting mixer, by applying
90° phase-shifted signals to the I and Q inputs. The I/Q
baseband inputs consist of voltage-to-current converters
that in turn drive double-balanced mixers. The outputs of
these mixers are summed and applied to an on-chip RF
transformer, which converts the differential mixer signals
to a 50Ω single-ended output. The four balanced I and Q
baseband input ports are intended for DC coupling from a
source with a common-mode voltage level of about 0.5V.
The LO path consists of an LO buffer with single-ended
input, and precision quadrature generators that produce
the LO drive for the mixers. The supply voltage range is
4.5V to 5.25V.
RF = 1.5GHz
TO 2.4GHz
, LTC and LT are registered trademarks of Linear Technology Corporation.
5528 TA01a
®
Quadrature Modulator
5528 is a direct I/Q modulator designed for high
High Linearity Direct
W-CDMA ACPR, AltCPR and Noise vs RF Output
Power at 2140MHz for 1, 2 and 4 Channels
–55
–60
–65
–70
–75
–80
1.5GHz to 2.4GHz
U
–42
4-CH NOISE
RF OUTPUT POWER PER CARRIER (dBm)
–38
2-CH AltCPR
1-CH AltCPR
DOWNLINK TEST MODEL 64 DPCH
–34
–30
4-CH ACPR
1-CH NOISE
–26
4-CH AltCPR
1-CH ACPR
–22
2-CH ACPR
LT5528
–18
5528 TA01b
–14
–140
–145
–150
–155
–160
–165
1
5528f
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