Digital InGaAs detector significantly orients the development of short wave (SW) infrared detector technology, it not only can increase integrated level of the system, but also can develop the imager’s performance. The key point to realize the digital InGaAs detector is integrating ADC into the readout integrated circuit (ROIC) and realize digital ROIC (DROIC). The 640×512 DROIC was designed and fabricated, it interconnected InGaAs detector focal plane array with In and realized digital InGaAs detector assembly. The proposed digital InGaAs detector assembly was tested, and the measurement results show that its readout noise is 230 μV, peak quantum efficiency is 65%, detectivity under 300 K temperature is 1.2×10¹² cm Hz^1/2 / W, and the power consumption is 94 mW when frame rate is 60 Hz. The measurement results indicate that the digital InGaAs detector assembly has some features as low readout noise, high linearity, wide transmission bandwidth, good resistance to interference and so on.