700 MHz to 4200 MHz Tx DGA

The ADL5335 is a digital gain amplifier (DGA) optimized for use in wireless transmitters. A differential input and single- ended output facilitates a balun free connection between the broadband integrated transceivers with differential outputs and the RF gain blocks and drivers amplifiers with single-ended inputs.

The gain is programmable via a standard Analog Devices, Inc., serial peripheral interface (SPI) port from a maximum gain of 12.0 dB down to a minimum gain of −8.0 dB with a gain step size of 0.5 dB. The ADL5335 also features a fast attack function where the gain can rapidly increase or decrease by the application of a single pulse.

The use of a thermometer-based digital step attenuator (DSA) ensures that gain changes are fundamentally glitch free. The ADL5335 is packaged in a 4 mm × 4 mm, 16-lead LFCSP. A fully populated evaluation board and system demonstration platform (SDP)-based control software are available.

Applications

* RF power control and calibration in wireless transmitters

* Differential input to single-ended output conversion

* Broad input frequency range: 700 MHz to 4200 MHz

* Maximum gain: 12.0 dB typical

* Gain range of 20 dB typical

* Gain step size: 0.5 dB typical

* Glitch free, thermometer-based digital step attenuator

* Fast attack, gain switching with programmable gain step

* Matched 50 Ω inputs and output