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We characterize a new x-ray Mixed-Mode Pixel Array Detector (MM-PAD-2.1)Application Specific Integrated Circuit (ASIC). Using an integrating pixelfront-end with dynamic charge removal architecture, the MM-PAD-2.1 ASIC extendsthe maximum measurable x-ray signal (in 20 keV photon units) to > 10$^{7}$x-rays/pixel/frame while maintaining a low read noise across the full dynamicrange, all while imaging continuously at a frame rate of up to 10 kHz. Thein-pixel dynamic charge removal mechanism prevents saturation of the inputamplifier and proceeds in parallel with signal integration to achievedeadtime-less measurements with incident x-ray rates of > 10$^{10}$x-rays/pixel/s. The ASIC format consists of 128$\times$128 square pixels each150 $\mu$m on a side and is designed to be 3-side buttable so large arrays canbe effectively tiled. Here we use both laboratory x-ray sources and the CornellHigh Energy Synchrotron Source (CHESS) to characterize two single ASICprototype detectors for both low (single x-ray) and high incident fluxdetection. In the first detector the ASIC was solder bump-bonded to a 500$\mu$m thick Si sensor for efficient detection of x-rays below ~20 keV, whereasthe second detector used a 750 $\mu$m thick CdTe sensor for x-rays above $\sim$20 keV.

Characterization of 128x128 MM-PAD-2.1 ASIC: A Fast Framing Hard X-Ray Detector with High Dynamic Range