This module has been designed in three versions. This open source OPA4377 eight-channel operational amplifier module is the third version of the design. The test parameters will be released after the welding test is completed.

**First Edition**

Due to the unreasonable placement of components resulting in complicated wiring, the first version only verified the feasibility of the schematic diagram.

second edition

The second version has not yet been soldered and tested, and the device locations were reasonably arranged during the design process. The wiring process is much more convenient, and the line width is more reasonable than the first version. In theory, there will be no data instability caused by wiring line width. But compared to this open source (the third version), because the devices are placed on the front and back of the board, too many unnecessary vias will inevitably appear in the wiring, thereby increasing the instability of the module in use.

third edition

All chip components are placed on the front copper layer. around the chip array. This makes the network drawn from the chip easier to wire, and has more space to play in line width than before. It can better ensure the stability of the module.

Performance introduction

1. Rail-to-rail op amp;

2.4-channel operational amplifier;

3.Power supply voltage: 3.3V-5.5V;

4.5.5MHz gain bandwidth product;

5. Slew rate 2V/us;

6. Low noise: 7.5V/√Hz at 1kHz;

Performance description

The OPA4377 is a wideband CMOS amplifier; it provides very low noise: 7.5V/Hz at 1kHz low noise, low input bias current and low bias voltage;

The amplification factor of the op amp is 1+(RP i +Rx)/(Ry). The power input part is equipped with a reverse polarity protection circuit.

If used with a microcontroller, please make the module supply voltage consistent with the voltage of the microcontroller.