LTC6420-20

1

642020fa

FEATURES

APPLICATIONS

DESCRIPTION

Dual Matched

1.8GHz Differential

Amplifiers/ADC Drivers

targeted at processing signals from DC to 300MHz. 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 LTC6420-20 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 for transformers or AC-coupling

capacitors in many applications. The gain is internally

fixed at 20dB (10V/V).

The LTC6420-20 saves space and power compared to

alternative solutions using IF gain blocks and transformers.

The LTC6420-20 is packaged in a compact 20-lead

3mm

× 4mm QFN package and operates over the –40°C

to 85°C temperature range.

Distribution of Gain Match

Adjustable

× 4mm × 0.75mm QFN Package

Matched Dual Amplifier with Output Common Mode Biasing

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

642020 TA01a

0.1μF

+OUT A

–OUT A

–IN A

+IN A

0.1μF

100Ω

100Ω

12.5Ω

12.5Ω

1000Ω

1000Ω

0.1μF

– OUT B

+OUT B

+IN B

–IN B

0.1μF

100Ω

100Ω

12.5Ω

12.5Ω

1000Ω

1000Ω

0.1μF

1000pF

0.1μF

1000pF

3V

3V

V+ A

ENABLEA

V+ B

ENABLEB

±0.1dB GAIN MATCHING

±0.1° PHASE MATCHING AT 100MHz

V–

V–

LTC6420-20

–

+

CHANNEL-TO-CHANNEL GAIN MATCH (dB)

– 0.25

40

35

30

15

20

25

10

5

0

– 0.15

– 0.05

642020 TA01b

0.05

0.15

0.25