**The AD7528JRZ: A Comprehensive Guide to the Dual 8-Bit CMOS DAC**

In the realm of digital-to-analog conversion, the AD7528JRZ from Analog Devices stands as a significant and versatile component. This integrated circuit is a **monolithic, dual 8-bit multiplying digital-to-analog converter (DAC)** fabricated on a single CMOS chip. Its design caters to a wide array of applications where space, power efficiency, and dual-channel operation are paramount.

**Architecture and Key Features**

The core of the AD7528JRZ's appeal lies in its dual-channel architecture. It incorporates **two complete, independent 8-bit DACs** within one 20-lead package. This integration is crucial for systems requiring simultaneous or correlated analog outputs, such as in X-Y plotting or complex waveform generation.

Being a multiplying DAC, its reference input is analog, allowing it to function not only as a standard digital-to-analog converter but also as a **digitally controlled attenuator or analog multiplier**. This flexibility is a powerful feature for modulation and signal conditioning tasks.

Constructed with low-power CMOS technology, the device is renowned for its **high efficiency and low power consumption**, making it suitable for portable and battery-operated equipment. Furthermore, it offers **excellent four-quadrant multiplication characteristics** with a typical multiplying feedthrough error of just 4mV at 10kHz.

**Interface and Control Logic**

The AD7528JRZ is designed for straightforward interfacing with most microprocessors. It features **separate data latches for each of the two DACs**. The control logic, consisting of Chip Select (CS), Write (WR), and DAC Select (DACSEL) signals, allows the host processor to independently write data to either DAC register with a simple write sequence. This streamlined interface simplifies software control and system design.

**Primary Applications**

The combination of its dual outputs and multiplying capability opens doors to numerous applications:

* **Automatic Test Equipment (ATE)**: For generating precise dual programmable voltage sources.

* **Digital Control Systems**: Providing independent control loops.

* **Programmable Filters and Waveform Generation**: Where two correlated analog signals are needed.

* **Motion Control Systems**: Driving two axes simultaneously.

* **Audio Equipment**: Acting as a digitally controlled stereo attenuator.

**Conclusion and Considerations**

The AD7528JRZ remains a compelling choice for designers seeking a reliable, dual-channel, 8-bit DAC solution. Its **monolithic CMOS construction ensures low power and high integration**, while its multiplying functionality provides exceptional design flexibility. When implementing this DAC, careful attention should be paid to reference voltage stability and output amplifier selection to ensure optimal performance and minimize errors like offset and gain inaccuracies.

**ICGOODFIND:** The AD7528JRZ is a classic, highly integrated solution that excels in applications demanding **dual-channel 8-bit resolution, microprocessor compatibility, and the versatile functionality of a multiplying DAC**. Its enduring design makes it a robust and efficient choice for modern embedded systems.

**Keywords:** Dual 8-Bit DAC, Multiplying DAC, CMOS DAC, Digital-to-Analog Converter, Microprocessor-Compatible.