Cheap 8-bit DA converter using multiplying DA converter IC - Power Circuit - Circuit Diagram

MOS Power IC Full Range

CSTLS5M00G56-A0-D

US1M(A)

Circuit Function

The role of the 8-bit DA converter is to transform digital signals from a digital system into records or visual displays on an XY monitor. This circuit uses cost-effective components.

Since the C-MOS DA converter is employed, both positive and negative reference voltages can be input. If an AC signal is applied to the reference voltage input terminal, digital modulation can be achieved.

Circuit Working Principle

IC1 acts as a latch that locks digital data, holding it at the rising edge of the clock signal. The AD7523 is an 8-bit DAC composed of a thin-film ladder resistor and a C-MOS switch, performing multiplication of the reference voltage VE and digital data. Current-to-voltage conversion is carried out by the operational amplifier A1. The output voltage EO is calculated as (digital data / 256) * VE, where the digital data range is a binary number from 0 to 255.

In this circuit, the AD7523 DAC converts the binary data into an analog voltage. The reference voltage VE is scaled down by dividing it by 256, depending on the binary value. This ensures that the output voltage EO accurately represents the digital input. The latch mechanism ensures that the digital data remains stable while being processed by the DAC. The operational amplifier then amplifies the current generated by the DAC into a stable voltage output, suitable for driving external devices like monitors or recorders.

This design is particularly useful in systems requiring high precision and low-cost solutions for digital-to-analog conversion. It’s commonly seen in applications such as audio processing, control systems, and instrumentation where accurate representation of digital data in analog form is essential.

Overall, this circuit demonstrates how simple yet effective components can be combined to create a functional and versatile digital-to-analog converter. Its ability to handle both positive and negative reference voltages adds flexibility to various applications, making it a valuable tool in modern electronic designs.