lt5571 Linear Technology Corporation, lt5571 Datasheet

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

■

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

OUT

Direct Conversion Transmitter Application

= 4dBm: –153.3dBm/Hz

V-I

Q-CH

I-CH

90°

VCO/SYNTHESIZER

0°

BALUN

LT5571

5571 TA01a

100nF

×2

Linearity Direct Quadrature

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

, 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

–110

–120

–130

–140

–150

–160

5571f

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