LT5512

1

5512fa

1kHz-3GHz High Signal Level

Active Mixer

timized for high linearity HF, VHF and UHF applications.

The IC includes an integrated LO buffer amplifier to drive

the mixer and an RF buffer amplifier for improved LO-RF

isolation. Internal bias circuits eliminate the need for

precision external resistors and allow the device to be

powered-down using the enable control (EN) pin.

The externally matched RF and IF ports allow the mixer

to be used at very low frequencies, below 1MHz or up to

3GHz. The differential LO input is designed for single-ended

or a differential input drive.

The LT5512 is a high-linearity alternative to passive diode

mixers. Unlike passive mixers, which have conversion

loss and require high LO drive levels, the LT5512 deliv-

ers conversion gain and requires significantly lower LO

drive levels.

+17dBm at 1900MHz

14dB at 1900MHz

× 4mm QFN Package

High Signal-Level Downmixer for 600MHz Wireless Medical Telemetry System

APPLICATIO S

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

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

All other trademarks are the property of their respective owners.

5512 TA01

RF

+

RF–

LO

+

LO–

IF

+

IF–

8:1

LT5512

1.8pF

0.01

µF

0.01

µF

0.01

µF

45MHz

50

Ω

BIAS

1

µF

6.8nH

6.8pF

6.8nH

47nH

EN

5V

4.5V TO 5.25V

6.8pF

608MHz

TO 614MHz

50

Ω

–5dBm TYP

100

Ω

LO POWER (dBm)

–11

1

5

9

13

–9

–7

–5

–3

5512 TA01a

–1

17

21

–80

–60

–40

–20

0

20

3

7

11

15

19

1

IIP3

SSB NF

LO-IF

LO-RF

RF = 610MHz

HIGH-SIDE LO

IF = 45MHz

Conv Gain, IIP3, NF and

LO Leakage vs LO Power