Amplifier is suitable for cable set top boxes, cable modems, xDSL modems and xDSL central office line cards. It offers very low noise, high performance amplifiers that are widely deployed as xDSL receivers.

The VGA integrates two high performance amplifiers and a digital step attenuator (DSA). Amplifier 1 (AMP1) is an internally matched gain block amplifier with 20dB gain, and Amplifier 2 (AMP2) is a broadband 0.25W driver amplifier that requires very few external tuning components. The DSA is 6-bit with a 31.5dB gain control range, 0.5 dB steps, and ±0.25dB step accuracy. The attenuation of the DSA can be controlled using a serial or parallel interface.

The gain block and DSA are internally matched to 50ohms at their inputs and outputs, and all three internal devices are separately biased. The separate bias allows all or part of the ADL5243 to be used, which allows for easy reuse throughout a design. The pinout of the ADL5243 also enables the gain block, DSA, or 0.25W driver amplifier to be first, giving the VGA maximum flexibility in a signal chain.