626x Low Noise Programmable Gain Preamplifiers THAT Corporation 6261, 6263, and 6266 Low Noise Programmable Gain Preamplifiers are digitally controlled, 2-channel preamps with integrated ADC (Analog to Digital Converter) drivers. The gain for the 626x Preamplifiers is programmable from -8dB to +34 dB. These low-power (60mW) devices can be powered by unipolar (+10V and +5V) or bipolar (±5V) power supplies.