LT5511

1

5511i

s

CATV Downlink Infrastructure

s

Wireless Infrastructure

s

High Linearity Mixer Applications

High Signal Level

Upconverting Mixer

The LT

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.

RF Output Power

and 3rd Order Intermodulation

vs Input Power (Two Input Tones)

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

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

BIAS

VCCLO

EN

5511 F01a

TO

DOWNMIXER

GND

LO INPUT

994MHz

–10dBm

950MHz

44MHz

MOD

5V

ENABLE

LT5511

IF INPUT POWER (dBm/TONE)

–20

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

–100

0

5511 F01b

–15

–10

–5

5

IM3

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO