LT5575EUF Linear Technology Corporation, LT5575EUF Datasheet

LT5575EUF

Manufacturer Part Number

LT5575EUF

Description

Manufacturer

Linear Technology Corporation

Datasheets

1.LT5575EUF.pdf (16 pages)

2.LT5575EUF.pdf (16 pages)

Specifications of LT5575EUF

Case

QFN

Date_code

10+

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Download datasheet (312Kb)

FEATURES

APPLICATIONS

■

TYPICAL APPLICATION

Input Frequency Range: 0.8GHz to 2.7GHz*

50Ω Single-Ended RF and LO Ports

High IIP3: 28dBm at 900MHz, 22.6dBm at 1.9GHz

High IIP2: 54.1dBm at 900MHz, 60dBm at 1.9GHz

Input P1dB: 13.2dBm at 900MHz

I/Q Gain Mismatch: 0.04dB Typical

I/Q Phase Mismatch: 0.4° Typical

Low Output DC Offsets

Noise Figure: 12.8dB at 900MHz, 12.7dB at 1.9GHz

Conversion Gain: 3dB at 900MHz, 4.2dB at 1.9GHz

Very Few External Components

Shutdown Mode

16-Lead QFN 4mm × 4mm Package with

Exposed Pad

Cellular/PCS/UMTS Infrastructure

RFID Reader

High Linearity Direct Conversion I/Q Receiver

BPF

LNA

High Signal-Level I/Q Demodulator for Wireless Infrastructure

BPF

LO INPUT

ENABLE

INPUT

0°/90°

+5V

0°

90°

LT5575

High Linearity Direct Conversion

OUT

5575 TA01

–

LPF

VGA

DESCRIPTION

The LT

quadrature demodulator optimized for high linearity

receiver applications. It is suitable for communications

receivers where an RF signal is directly converted into I

and Q baseband signals with bandwidth up to 490MHz.

The LT5575 incorporates balanced I and Q mixers, LO

buffer ampliﬁ ers and a precision, high frequency quadrature

phase shifter. The integrated on-chip broadband transform-

ers provide 50Ω single-ended interfaces at the RF and LO

inputs. Only a few external capacitors are needed for its

application in an RF receiver system.

The high linearity of the LT5575 provides excellent spur-

free dynamic range for the receiver. This direct conversion

demodulator can eliminate the need for intermediate fre-

quency (IF) signal processing, as well as the corresponding

requirements for image ﬁ ltering and IF ﬁ ltering. Channel

ﬁ ltering can be performed directly at the outputs of the I

and Q channels. These outputs can interface directly to

channel-select ﬁ lters (LPFs) or to baseband ampliﬁ ers.

All other trademarks are the property of their respective owners.

*Operation over a wider frequency range is possible with reduced performance. Consult

the factory.

Quadrature Demodulator

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

A/D

5575 is an 800MHz to 2.7GHz direct conversion

800MHz to 2.7GHz

–15

Conversion Gain, NF, IIP3 and IIP2

vs LO Input Power at 1900MHz

–40°C

25°C

85°C

–10

LO INPUT POWER (dBm)

–5

DSB NF

CONV

GAIN

IIP2

IIP3

LT5575

5575 TA01b

5575f

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