This combination of features allows designers to use a single device to meet all of their requirements in multicarrier GSM and LTE transmitters designed for wireless macro base stations, point-to-point microwave radio, military radios and radio test equipment. The DAC includes a range of features optimised for complex IF transmit applications, including complex digital modulation, input-signal power detection and gain, phase and offset compensation.
The AD9154 is designed to up-convert a pair of I/Q digital input signals, creating a complex IF signal at the input to a pair of on-chip DAC cores. The device features several interpolation modes, increasing the sampling rate of the digital signal to the Nyquist frequency to enable simpler, less costly transmitter filters following the DAC analogue output. The converter additionally includes digital-signal correction for quadrature modulator up-converters to cancel RF local oscillator feed-through and unwanted side-bands.
The AD9154 was designed with an eight-lane JESD204B interface that simplifies board layout by providing deterministic latency and multi-device synchronisation for radio transmitters that use multiple antennas. This is an increasingly common feature in wireless base stations, radar and military radio communications.
The converter’s outputs are optimised to interface with ADI’s ADRF672x line of RF quadrature modulators, the ADL5375 quadrature modulator, ADM7150 low-dropout linear regulator and the ADF4351 wideband synthesiser with integrated VCO.
