LTC6401-26

1

640126f

FREQUENCY (MHz)

0

0

10

20

30

40

50

60

50

100

150

200

640126 TA01b

DIFFERENTIAL INPUT

(NOTE 7)

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

1.6GHz Low Noise,

Low Distortion Differential

ADC Driver for DC-140MHz

targeted at processing signals from DC to 140MHz. The

part has been specifically designed to drive 12-, 14- and

16-bit ADCs with low noise and low distortion, but can also

be used as a general-purpose broadband gain block.

The LTC6401-26 is easy to use, with minimal support

circuitry required. The output common mode voltage is

set using an external pin, independent of the inputs, which

eliminates the need of transformers or AC-coupling ca-

pacitors in many applications. The gain is internally fixed

at 26dB (20V/V).

The LTC6401-26 saves space and power compared to

alternative solutions using IF gain blocks and transform-

ers. The LTC6401-26 is packaged in a compact 16-lead

3mm × 3mm QFN package and operates over the –40°C

to 85°C temperature range.

Equivalent OIP3 vs Frequency

■

1.6GHz –3dB Bandwidth

■

Fixed Gain of 20V/V (26dB)

■

–85dBc IMD3 at 70MHz (Equivalent OIP3 = 46.5dBm)

■

–72dBc IMD3 at 140MHz (Equivalent OIP3 = 40dBm)

■

1nV/√⎯H⎯z Internal Op Amp Noise

■

1.5nV/√⎯H⎯z Total Input Referred Noise

■

6.8dB Noise Figure

■

Differential Inputs and Outputs

■

50Ω Input Impedance

■

2.85V to 3.5V Supply Voltage

■

45mA Supply Current (135mW)

■

1V to 1.6V Output Common Mode, Adjustable

■

DC- or AC-Coupled Operation

■

■

Small 16-Lead 3mm × 3mm × 0.75mm QFN Package

■

Differential ADC Driver

■

Differential Driver/Receiver

■

Single Ended to Differential Conversion

■

IF Sampling Receivers

■

SAW Filter Interfacing

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

All other trademarks are the property of their respective owners.

Single-Ended to Differential ADC Driver at 140MHz IF

37.4

Ω

150

Ω

0.1

μF

0.1

μF

640126 TA01a

LTC6401-26

LTC2208

LTC2208

130Msps

16-BIT ADC

15

Ω

0.1

μF

1000pF

3.3V

3.3V

15

Ω

10

Ω

10

Ω

100

Ω

0.1

μF

1.25V

33pF

COILCRAFT

0603CS

33pF

L1

24nH

33pF

–IN

+IN

+OUT

–OUT

V–

LTC6401-26