**AD7243BRZ: A Comprehensive Technical Overview of the 12-Bit Triple Voltage Output DAC**
The **AD7243BRZ** from Analog Devices represents a highly integrated solution for applications requiring multiple, precise analog voltage outputs. This device is a **12-bit, triple voltage-output digital-to-analog converter (DAC)** that combines three complete DACs on a single monolithic chip. Housed in a compact 24-lead SOIC_W package, it is engineered for performance and space-constrained designs across industrial control, automated test equipment, and motion control systems.
**Architecture and Core Functionality**
At its heart, the AD7243BRZ features three **12-bit DACs**, each with its own dedicated input register and a precision output amplifier. This architecture allows the three channels to be updated simultaneously or independently, providing exceptional flexibility. The digital interface is designed for easy connection to microprocessors, featuring double-buffered logic with data arranged in a **12-bit right-justified format**.
A key to its precision is the **on-chip buried Zener voltage reference**, which provides a stable +2.5V source for all three DACs. This integrated reference eliminates the need for an external component, reduces board space, and ensures that all outputs track together from a common source, enhancing system stability. The output amplifiers are configured to provide either a **bipolar ±3V or a unipolar 0V to +4V output range**, selected via a single control pin (`RANGE`). This dual-range capability makes the DAC versatile for a wide array of signal conditioning tasks.
**Key Performance Specifications**
The AD7243BRZ is distinguished by its robust performance metrics:
* **Resolution:** 12 Bits
* **Integral Nonlinearity (INL):** ±1 LSB (max) – ensuring excellent accuracy across the entire output range.
* **Settling Time:** 10 μs to ±0.5 LSB for a 10V step – a critical parameter for dynamic output applications.
* **Low Gain Error:** Typically ±0.1% of FSR, which minimizes the need for extensive calibration.
* **Single-Supply Operation:** It can operate from a single +12 V to +15 V supply, simplifying power management design.
**Interface and Control**
The device features a versatile control logic interface. The `LOAD` pins (`LOAD A`, `LOAD B`, `LOAD C`) control the loading of each input register, while a common `LDAC` (Load DAC) pin enables the simultaneous update of all three DAC outputs from their respective input registers. This double-buffering is essential for applications where outputs must change at the same instant without generating glitches.
**Applications and Use Cases**
The triple-output capability of the AD7243BRZ makes it exceptionally suitable for multi-axis control systems. It is ideal for:
* **Programmable Power Supplies**, where it can set voltage and current limits.
* **Industrial Process Control**, driving setpoints for various control loops.
* **Motion Control Systems**, providing reference voltages for multiple motor drives.
* **Automated Test Equipment (ATE)**, for sourcing precise analog stimuli.
**ICGOO**DFIND: The **AD7243BRZ** stands out as a highly integrated, precise, and flexible solution for multi-channel voltage generation. Its combination of **triple 12-bit DACs**, a **stable on-chip reference**, **dual output ranges**, and a **versatile digital interface** consolidates critical functions into a single IC, reducing system complexity, cost, and footprint while guaranteeing matched performance across all channels.
**Keywords:** 12-Bit DAC, Triple Voltage Output, On-Chip Reference, Simultaneous Update, Industrial Control Systems.
