LT5511 View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LT5511

High Signal Level Upconverting Mixer

Linear Technology 

FEATURES

s Wide RF Output Frequency Range to 3000MHz

s Broadband RF and IF Operation

s +17dBm Typical Input IP3 (at 950MHz)

s +6dBm IF Input for 1dB RF Output Compression

s Integrated LO Buffer: –10dBm Drive Level

s Single-Ended or Differential LO Input

s Double-Balanced Mixer

s Enable Function

s Single 4.0V – 5.25V Supply Voltage Range

s 16-Pin TSSOP Exposed Pad Package

U

APPLICATIO S

s CATV Downlink Infrastructure

s Wireless Infrastructure

s High Linearity Mixer Applications

LT5511

High Signal Level

Upconverting Mixer

DESCRIPTIO

The LT®5511 mixer is designed to meet the high linearity

requirements of cable TV infrastructure downstream trans-

mitters and wireless infrastructure transmit systems. The

IC includes a differential LO buffer amplifier driving a

double-balanced mixer. The LO, RF and IF ports can be

easily matched to a broad range of frequencies for differ-

ent applications. The high performance capability of the

LO buffer allows the use of a single-ended source, thus

eliminating the need for an LO balun.

The LT5511 mixer delivers +17dBm typical input 3rd

order intercept point at 950MHz, and +15.5dBm IIP3 at

1900MHz, with IF input signal levels of – 5dBm. The input

1dB compression point is typically +6dBm.

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

TYPICAL APPLICATIO

44MHz

MOD

ENABLE

LT5511

EN VCCBIAS VCCLO

BIAS

IF+

RF+

IF–

RF –

LO+

LO INPUT

994MHz

–10dBm

GND

LO–

5511 F01a

VCC

5V

950MHz

TO

DOWNMIXER

RF Output Power

and 3rd Order Intermodulation

vs Input Power (Two Input Tones)

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

–20

POUT

IM3

PLO = –10dBm

fRF1 = 950MHz

fRF2 = 949MHz

TA = 25°C

–15 –10 –5

0

5

IF INPUT POWER (dBm/TONE)

5511 F01b

Figure 1. High Signal Level Upmixer for CATV Downlink Infrastructure.

5511i

1

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