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Abstract This letter presents a second‐order incremental ADC (IADC) operated in three steps, which extends the performance of a second‐order IADC close to that of a fourth‐order IADC with only two amplifiers. It performs a second‐order noise‐shaping quantization in the first step operation. Reusing the same hardware, the circuit is reconfigured to perform fine quantization as a first‐order IADC in the second and third step. Within a conversion time of 60 clock periods (oversampling ratio OSR = 60), 35 dB signal‐to‐quantization‐noise ratio is boosted. The proposed topology is very suitable for low‐bandwidth high‐resolution data conversion.