LT6411

1

6411f

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

650MHz Differential ADC

Driver/Dual Selectable

Gain Amplifier

The LT

gains of +1, +2 and –1. The amplifiers have excellent dis-

tortion performance for driving ADCs as well as excellent

bandwidth and slew rate for video, data transmission and

other high speed applications. Single-ended to differential

conversion with a system gain of 2 is particularly straight-

forward by configuring one amplifier with a gain of +1

and the other amplifier with a gain of –1. The LT6411 can

be used on split supplies as large as ±6V and on a single

supply as low as 4.5V.

Each amplifier draws only 8mA of quiescent current when

enabled. When disabled, the output pins become high

impedance and each amplifier draws less than 350µA.

The LT6411 is manufactured on Linear Technology’s

proprietary, low voltage, complimentary, bipolar process

and is available in the ultra-compact, 3mm

× 3mm, 16pin

QFN package.

Conversion

ADC

–87dBc at 30MHz, –83dBc at 70MHz

× 3mm 16-Pin QFN Package

Differential ADC Driver

30MHz 2-Tone 32768 Point FFT, LT6411

Driving an LTC

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

All other trademarks are the property of their respective owners.

5V

–

6411 TA01a

LTC2249

14-BIT ADC

80Msps

+

+

+

–

–

DGND

EN

LT6411

30MHz

INPUT

370

Ω

370

Ω

24

Ω

24

Ω

370

Ω

370

Ω

FREQUENCY (MHz)

0

–140

–120

–100

–80

0

–40

5

15

20

40

6411 TA01b

–20

–60

–130

–110

–90

–10

–50

–30

–70

10

25

30

35

32768 POINT FFT

TONE 1 AT 29.5MHz, –7dBFS

TONE 2 AT 30.5MHz, –7dBFS

IM3 = –87dBc