Data Sheet

ADCA3280

THEORY OF OPERATION

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Rev. 0 | 12 of 18

The ADCA3280 is a balanced amplifier packaged in a 9-termi-

nal LGA_CAV package. The application circuit interfaces the AD-

CA3280 to a 75 Ω input and output matched impedance consistent

with a matched module designed for community access television

(CATV) applications. The ADCA3280 uses cascode field effect

transistor (FET) feedback amplifiers in a Class A push-pull config-

uration. The bottom half of the cascode stages are implemented

in a single die, linear gallium arsenide (GaAs), FET process that

minimizes parasitics, enabling higher gain. The top devices in the

cascodes are implemented using a linear gallium nitride (GaN)

process that is able to swing high RF voltages. The frequency of

operation is from 45 MHz to 1794 MHz. Application circuits that

use the 45 MHz to 108 MHz frequency range can be developed as

required.

Depending on the application, the ADCA3280 can be biased from

18 V through 24 V with a range of bias currents. The ADCA3280

is unconditionally stable in the recommended application circuit

for robust operation in systems targeting DOCSIS 4.0 and legacy

DOCSIS standards.