A DA converter includes a first DA conversion section for obtaining an analog output signal in accordance with a digital input signal value, and a second DA conversion section for obtaining an analog gain control output signal in accordance with a digital gain control input signal value. The invention relates to the seeds of inbred maize line HLA22ND, to the plants of inbred maize line HLA22ND and to methods for producing a maize plant, either inbred or hybrid, by crossing the inbred line HLA22ND with itself or another maize line. A make-up hydrogen stream may also be compressed in the recycle gas compressor.