The ADF5902 from Analog Devices is a Multi-Channel FMCW Radar Transmitter MMIC that operates in the ISM radio band from 24 to 24.25 GHz. It integrates two channels with single-ended outputs and has a 25-bit fixed modulus which allows sub-hertz frequency resolution. This transmitter consists of a VCO oscillator, phase frequency detector, R/N divider, 32-bit register with readback control, charge pump, gain blocks, 8-bit ADC, third-order fractional interpolator, FMCW waveform ramp generator, on-chip temperature sensor, other serial interfaces. It requires a DC supply from 3.135 to 3.465 V and consumes 190 mA of current.
This automotive-qualified MMIC’s VCO incorporates a fractional-N frequency synthesizer with waveform generation capability and a programmable grid array (PGA) for radar systems. It also includes a power control circuit for each transmit channel, 2-channel MUXed outputs with mute function, and a charge pump that allows the amount of charge to be controlled. The ADF5902 monitors and detects changes in the on-chip temperature using a temperature sensor. It has a 1/f noise of -120 dBc/Hz (at 10 kHz offset) and a VCO phase noise of -128 dBc/Hz (at 10 MHz offset. It is available in a chip-scale package that measures 5 x 5 mm and is ideal for automotive, industrial, and microwave radar sensor applications.
