LTC6421CUDC-20-TRPBF datasheet(11/16 Pages) LINER

Part #	LTC6421CUDC-20-TRPBF

Description	Dual Matched 1.3GHz Differential Amplifi ers/ADC Drivers

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Manufacturer	LINER [Linear Technology]

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LTC6421-20

11

642120fa

voltage with a 0.1μF bypass capacitor. When interfacing

with A/D converters such as the LTC22xx families, the

VOCM pin can be connected to the VCM pin of the ADC.

Driving A/D Converters

The LTC6421-20 has been speciﬁcally designed to interface

directly with high speed A/D converters. The back page of

this data sheet shows the LTC6421-20 driving an LTC2285,

which is a dual 14-bit, 125Msps ADC.

The VOCM pins of the LTC6421-20 are connected to the

VCM pins of the LTC2285, which provide a DC voltage

level of 1.5V. Both ICs are powered from the same 3V

supply voltage.

The inputs to the LTC6421-20 can be conﬁgured in various

ways, as described in the Input Impedance and Matching

section of this datasheet. The outputs of the LTC6421-20

may be connected directly to the analog inputs of an ADC,

or a simple lowpass or bandpass ﬁlter network may be

inserted to reduce out-of-band noise.

Test Circuits

Due to the fully-differential design of the LTC6421 and

its usefulness in applications with differing characteristic

speciﬁcations, two test circuits are used to generate the

information in this datasheet. Test Circuit A is DC1299, a

two-port demonstration circuit for the LTC6420/LTC6421

family. The schematic and silkscreen are shown in Figure 4.

This circuit includes input and output transformers (baluns)

for single-ended-to-differential conversion and impedance

transformation, allowing direct hook-up to a 2-port network

analyzer. There are also series resistors at the output to

avoid loading the ampliﬁer directly with a 50Ω load. Due

to the input and output transformers, the –3dB bandwidth

is reduced from 1.3GHz to approximately 1.1GHz.

Test Circuit B uses a 4-port network analyzer to measure

S-parameters and gain/phase response. This removes the

effects of the wideband baluns and associated circuitry,

for a true picture of the >1GHz S-parameters and AC

characteristics.

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