SPECIFICATIONS

Main parameter
Amplifier Type: Dedicated instrumentation amplifier AD623 core
Input range: 0.5VCC (i.e. the voltage between S+/S- is less than half of the supply voltage.)
Output range: +-VCC (rail to rail)
Magnification: 2-1000x adjustable.
Power consumption: 150uA (typical) 650uA (Max)
Power supply: 3-5.5V
Gain accuracy: 0.35% (G>2) 0.10% (G=2)
Input offset voltage: 100-200uV
Input offset drift :1uv/℃
Common mode rejection ratio: 90db
Gain bandwidth: 800KHZ.

Schematic diagram:

1. Single power supply mode:

If the input signals (IN- and IN+) are in the positive power supply range from 0 to VCC (including differential signals with DC bias), the module only needs a single power supply. In this case, disconnect J10 and J11; Switch on J5, J8, J7, when the module is working in a single power supply state, you can input the DC bias voltage from the SMA3 (or J4) end (or switch on J7, and set the bias voltage by the potentiometer).

2, using dual power supply mode:

The input voltage is dual power supply, default delivery: disconnect J5, J11; Connect J10, J8, J7

If the input voltage is a single power supply, the negative pressure module needs to be converted. Default delivery: Disconnect J5; Connect J10, J11, J8, J7

If the input signals (IN- and IN+) contain negative voltage components or pure AC signals, the module needs dual power supply, in this case, disconnect J5; Switch on J8, J10, J11, when the module is working in the dual power supply state, you can input the DC bias voltage from the SMA3 (or J4) end, (or switch on J7, and set the bias voltage by the potentiometer).

Output signal Vout=[(Vin+)-(Vin-)]*G+Vref

             G=1+(100k/RG)