lt5571 Linear Technology Corporation, lt5571 Datasheet
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lt5571
Manufacturer Part Number
lt5571
Description
620mhz - 1100mhz High Linearity Direct Quadrature Modulator
Manufacturer
Linear Technology Corporation
Datasheet
1.LT5571.pdf
(16 pages)
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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
GENERATOR
BASEBAND
Direct Conversion from Baseband to RF
High Output: –4.2dB Conversion Gain
High OIP3: 21.7dBm at 900MHz
Low Output Noise Floor at 20MHz Offset:
Low Carrier Leakage: –42dBm at 900MHz
High Image Rejection: –53dBc at 900MHz
3-Ch CDMA2000 ACPR: –70.4dBc at 900MHz
Integrated LO Buffer and LO Quadrature Phase
Generator
50Ω AC-Coupled Single-Ended LO and RF Ports
High Impedance DC Interface to Baseband Inputs
with 0.5V Common Mode Voltage
16-Lead QFN 4mm × 4mm Package
RFID Interrogators
GSM, CDMA, CDMA2000 Transmitters
Point-to-Point Wireless Infrastructure Tx
Image Reject Up-Converters for Cellular Bands
Low-Noise Variable Phase-Shifter for 620MHz to
1100MHz Local Oscillator Signals
Q-DAC
I-DAC
No RF: –159dBm/Hz
P
OUT
EN
Direct Conversion Transmitter Application
= 4dBm: –153.3dBm/Hz
V-I
V-I
Q-CH
I-CH
90°
VCO/SYNTHESIZER
0°
V
CC
BALUN
LT5571
5571 TA01a
100nF
×2
Linearity Direct Quadrature
PA
DESCRIPTION
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
RFID, GSM, EDGE, CDMA, CDMA2000, and other systems.
It may also be confi gured as an image reject upconvert-
ing mixer by applying 90° phase-shifted signals to the I
and Q inputs. The high impedance 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 at 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.
All other trademarks are the property of their respective owners.
RF = 620MHz
TO 1100MHz
5V
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
620MHz – 1100MHz High
®
5571 is a direct I/Q modulator designed for high
Output Power at 900MHz for 1 and 3 Carriers
CDMA2000 ACPR, AltCPR and Noise vs RF
–40
–50
–60
–70
–80
–90
–30
DOWNLINK TEST
MODEL 64 DPCH
RF OUTPUT POWER PER CARRIER (dBm)
3-CH NOISE
–25
3-CH AltCPR
1-CH AltCPR
–20
3-CH ACPR
–15
Modulator
–10
1-CH NOISE
LT5571
–5
ACPR
1-CH
5571 TA01b
0
–110
–120
–130
–140
–150
–160
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5571f