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There is growing recognition of the potential for hyperspectral microwave sensors to improve the vertical resolution of temperature and humidity profiles, especially near Earth's surface, i.e., the planetary boundary layer. In response to the need for broadband, fine-spectral resolution data, NASA has funded the development of a low-power digital spectrometer Application Specific Integrated Circuit (ASIC) through NASA Small Business Innovative Research (SBIR) program awards to Pacific MicroChip Corporation (PMCC.) The outcome of these investments is a commercially available digital spectrometer ASIC that includes a 6-bit, time interleaved analog-to-digital converter (ADC) with a sampling rate up to 8 GSPS. The radiation tolerant, highly-configurable digital spectrometer ASIC can digitize and process signals up to 4 GHz bandwidth with up to 8192 frequency bins while drawing less than 1.75 W of power. To meet a broad range of system requirements, the digital spectrometer ASIC includes a programmable gain amplifier, a 16 GHz Phase Locked Loop (PLL) based frequency synthesizer, a demultiplexer, a poly-phase filter bank, a programmable windowing function, a Fast-Fourier-Transform (FFT) core, a frequency-domain data analysis block, a programmable time (2 µs to 34 s) accumulator of frequency-domain voltage or power, a data readout block, a Serial Peripheral Interface (SPI) for the ASIC's programming and low-speed data interchange, a low-voltage differential signal (LVDS) interface for high-speed data transfer, a digital control unit and built-in ASIC testing features.