Judging from the device model, circuit structure, terminal name, supply voltage, in general:
1, analog circuit amplifier graphics is triangular, positive, negative dual power supply, the supply voltage is greater than 5V, the input, the output has a feedback resistor connection.
2, the digital circuit is a single-supply operation, the supply voltage is mostly 5V or 3.3V, the logic diagram is rectangular, different logic door has a standard icon, it is easy to identify.
The actual circuit diagram, not the work of the paper, are marked with the device model, at a glance.
The circuit identification of discrete components can see the bias circuit, the digital circuit has no bias circuit.
To the left | Turn right
In the same schematic, since there are analog circuits and digital circuits, then, there is an interface circuit, such as comparator, analog-to-digital converter, digital-to-analog converter, interface circuit is the dividing line between analogue and digital.
to the left | to the right analog circuit is the output analog input, the digital circuit is no matter what the input as long as the threshold is reached to determine the output to open or close