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LT5503
(Rev.:RevA)

1.2GHz to 2.7GHz Direct IQ Modulator and Mixer

Linear Technology 

OBSOLETE:

FOR INFORMATION PURPOSES ONLY

Contact Linear Technology for Potential Replacement

Features

nn Single 1.8V to 5.25V Supply

nn Direct IQ Modulator with Integrated 90° Phase

Shifter*

nn 4-Step RF Power Control

nn 120MHz Modulation Bandwidth

nn Independent Double-Balanced Mixer

nn Modulation Accuracy Insensitive to Carrier Input

Power

nn Modulator I/Q Inputs Internally Biased

nn Available in 20-Lead FE Package

Applications

nn IEEE 802.11 DSSS and FHSS

nn High Speed Wireless LAN (WLAN)

nn Wireless Local Loop (WLL)

nn PCS Wireless Data

nn MMDS

LT5503

1.2GHz to 2.7GHz Direct

IQ Modulator and Mixer

Description

The LT®5503 is a front-end transmitter IC designed for

low voltage operation. The IC contains a high frequency

quadrature modulator with a variable gain amplifier (VGA)

and a balanced mixer. The modulator includes a precision

90° phase shifter which allows direct modulation of an RF

signal by the baseband I and Q signals.

In a superheterodyne system, the mixer can be used to

generate the high frequency RF input for the modulator by

mixing the system’s 1st and 2nd local oscillators.

The LT5503 modulator output P 1dB is –3dBm at 2.5GHz.

The VGA allows output power reduction in three steps

up to 13dB with digital control. The baseband inputs are

internally biased for maximum input voltage swing at low

supply voltage. If needed, they can be driven with external

bias voltages.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Patents pending.

Typical Application

2.45GHz Transmitter Application, Carrier for Modulator Generated by Upmixer

VCC2

2V

2.45GHz

BPF

VCC1

2V

MIXER

ENABLE

MODULATOR

ENABLE

LO2IN

(750MHz)

VCCLO2 VCCLO1

MIXEN

MODEN

LO2

÷2

÷1

MX– MX+

MODIN VCCRF

BQ+ BQ–

VCCMOD

VCCVGA

0°

90°

MODOUT

VGA

LT5503

GND

DMODE LO1

LO1IN (2075MHz)

CONTROL

LOGIC

GC1 GC2

2.45GHz

5503 TA01 MODULATED

BI+ BI–

RFOUT

SSB Output Power vs

I, Q Amplitude

0

5.25 VDC

3 VDC

–5

1.8 VDC

–10

–15

–20

–25

–30

–35

–40

–45

0.01

0.1

1

10

I, Q DIFFERENTIAL INPUT VOLTAGE (VP-P)

5503 G04

For more information www.linear.com/LT5503

5503fa

1

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