Demonstration circuits 566A-A, -B and -C, feature the easy to use, rail-to-rail input and output LTC6910 series of Low Noise Programmable Gain Amplifier (PGA) parts. The inverting gain is set by changing the positions of three onboard jumpers: G0, G1 and G2 to set the 3-bit programming code. Demo Circuit 566AA is for the LTC6910–1 with gains of 0, 1, 2, 5, 10, 20, 50, 100 V/V. Demo Circuit 566A-B is for the LTC6910–2 with gains of 1, 2, 4, 8, 16, 32, and 64 V/V. Demo Circuits 566A-C is for the LTC6910–3 with gains of 1, 2, 3, 4, 5, 6 and 7 V/V. All three-demo boards have input jumpers to select between AC or DC coupling of the input, and a jumper to select operation with a single or dual supply. Typical applications include data acquisition systems, dynamic gain changing, automatic ranging circuits and automatic gain control. The LTC6910 family can operate from single or split supplies from 2.7V to 10.5V total between V+ and V-.