LTC5598IUF LINER [Linear Technology], LTC5598IUF Datasheet

LTC5598IUF

Manufacturer Part Number

LTC5598IUF

Description

5MHz to 1600MHz High Linearity Direct Quadrature Modulator

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC5598IUF.pdf (16 pages)

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APPLICATIONS

TYPICAL APPLICATION

FEATURES

Frequency Range: 5MHz to 1600MHz

High Output IP3: +27.7dBm at 140MHz

Low Output Noise Floor at 6MHz Offset:

Low LO Feedthrough: –55dBm at 140MHz

High Image Rejection: –50.4dBc at 140MHz

Integrated LO Buffer and LO Quadrature Phase

Generator

50Ω Single-Ended LO and RF Ports

>400MHz Baseband Bandwidth

24-Lead QFN 4mm × 4mm Package

Pin-Compatible with Industry Standard Pin-Out

Shut-down Mode

Point-to-Point Microwave Link

Military Radio

Basestation Transmitter GSM/EDGE/CDMA2K

700MHz LTE Basestation Transmitter

Satellite Communication

CATV/Cable Broadband Modulator

13.56MHz/UHF RFID Modulator

GENERATOR

BASEBAND

No Baseband AC Input: –161.2dBm/Hz

OUT

Q-DAC

I-DAC

5MHz to 1600MHz Direct Conversion Transmitter Application

= 5.5dBm: –160dBm/Hz

+22.9dBm at 900MHz

Q-CHANNEL

V-I

I-CHANNEL

10nF

50Ω

VCO/SYNTHESIZER

10nF

470nF

LTC5598

5598 TA01

1nF

10nF

DESCRIPTION

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

All other trademarks are the property of their respective owners.

The LTC

performance wireless applications, including wireless

infrastructure. It allows direct modulation of an RF signal

using differential baseband I and Q signals. It supports

point-to-point microwave link, GSM, EDGE, CDMA,

700MHz band LTE, CDMA2000, CATV applications and

other systems. It may also be conﬁ gured as an image

reject upconverting 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 a buffer, which converts the differential mixer signals

to a 50Ω single-ended buffered RF 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 or differential inputs, and precision

quadrature generators that produce the LO drive for the

mixers. The supply voltage range is 4.5V to 5.25V, with

about 168mA current.

TO 1600MHz

RF = 5MHz

4.7μF

Quadrature Modulator

5598 is a direct I/Q modulator designed for high

High Linearity Direct

5MHz to 1600MHz

–152

–154

–156

–158

–160

–162

Noise Floor vs RF Output Power

and Differential LO Input Power

–14

–12 –10 –8 –6

= 140MHz; f

RF OUTPUT POWER (dBm)

20dBm

19.3dBm

13.4dBm

10.4dBm

8.4dBm

6.4dBm

–4 –2 0

= 2kHz; CW (NOTE 3)

LTC5598

5598 TA02

5598f

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