**AD7835APZ: A Comprehensive Technical Overview of the 16-Bit Quad Voltage Output DAC**

The AD7835APZ from Analog Devices represents a high-performance, monolithic solution for applications requiring multiple precision analog voltage outputs. This integrated circuit is a **16-bit, quad voltage-output digital-to-analog converter (DAC)** that combines exceptional accuracy, flexibility, and integration, making it a cornerstone component in complex industrial and communication systems.

Architecturally, the AD7835APZ incorporates four complete, independent 16-bit DACs onto a single chip. Each DAC features its own dedicated input register and a **double-buffered digital input interface**. This structure is critical for synchronous update scenarios. Users can load data into the individual DAC input registers sequentially and then simultaneously update all four analog outputs using a single update command, ensuring coordinated changes across all channels—a vital feature for multi-axis control systems.

The device operates on a **bipolar supply range, typically ±5 V or ±15 V**, providing flexibility in designing for various output voltage swings. Each channel's output is capable of **±10 V or ±5 V ranges**, selectable by the user, making it adaptable to numerous industrial standards. The core DAC utilizes a segmented current-source architecture combined with an R-2R ladder network. This design optimizes performance by minimizing glitch energy and ensuring high linearity. The outputs are driven by precision, fast-settling amplifiers that deliver the required voltage.

A key performance metric for any DAC is its linearity, which directly impacts accuracy. The AD7835APZ boasts excellent **differential nonlinearity (DNL) of ±1 LSB (max)** and integral nonlinearity (INL) of ±2 LSB (max), guaranteeing monotonicity across the entire 16-bit range. The typical settling time to within ±0.5 LSB of the final value for a full-scale step is a swift 10 µs to a 10 kΩ load, enabling rapid response in dynamic applications.

The digital interface is designed for easy connection to modern microprocessors and digital signal processors (DSPs). It features a high-speed, serial data input that minimizes pin count and simplifies PCB layout. The interface is compatible with standard serial protocols, including SPI, QSPI, and Microwire, facilitating straightforward integration into digital systems.

**Typical applications** for the AD7835APZ are found wherever multiple channels of high-resolution analog control are required. This includes industrial automation and process control (programmable logic controllers, motion control systems), automated test equipment (ATE) for stimulus and calibration, and medical instrumentation requiring precise voltage generation.

**ICGOO**

The AD7835APZ stands out as a highly integrated, precise, and versatile solution for multi-channel DAC requirements. Its combination of **16-bit resolution, four independent outputs, a flexible serial interface, and excellent dynamic performance** makes it an indispensable component for designers tackling complex system challenges that demand accuracy and reliability.

**Keywords: 16-Bit DAC, Quad Voltage Output, Digital-to-Analog Converter, High Resolution, Industrial Automation**