As shown in the figure, a programmable gain meter amplifying circuit composed of PGA103. The circuit uses a cascade of PGA205 and PGA103, so the total gain of the amplifier is the product of the gain of the two amplifiers, namely G=G1G2. G1=1, 2, 4, 8, G2=1, 10, 100. Different logic inputs can be selected to select different gains. The maximum gain can be up to 800 (other gains are 1, 2, 4, 8, 10, 20 respectively). , 40, 80, 100, 200, 400).
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