**LTC1859CG#TRPBF: A Comprehensive Technical Overview of Linear Technology's 16-Channel 12-Bit Multiplexed ADC**

The **LTC1859CG#TRPBF** from Linear Technology (now part of Analog Devices Inc.) stands as a highly integrated, high-performance data acquisition solution engineered for complex multi-channel systems. This device combines a **16-channel multiplexer**, a high-speed **12-bit successive approximation register (SAR) analog-to-digital converter (ADC)**, and a built-in sample-and-hold circuit into a single package. It is designed to simplify system design and reduce component count in applications requiring precise digitization of multiple analog signals.

At the core of the LTC1859 is its robust **12-bit SAR ADC**, capable of achieving a maximum throughput rate of **100ksps** (kilo-samples per second). This speed is sufficient for a wide range of industrial and instrumentation applications, including process control, power monitoring, and automated test equipment (ATE). The ADC delivers excellent DC and AC performance, featuring **±1LSB INL (Integral Non-Linearity)** and **±1LSB DNL (Differential Non-Linearity)** maximum, ensuring accurate conversion results across the entire analog input range.

A key feature of this IC is its integrated **16-channel multiplexer**. This multiplexer can be configured via software to handle either **8 differential or 16 single-ended input channels**, providing exceptional flexibility for interfacing with various sensors and signal sources. The analog inputs are fault-protected, capable of withstanding voltages up to **±25V even when the device's power supplies are unplugged**, a critical feature for robustness in harsh industrial environments. The built-in overvoltage protection significantly enhances system reliability and longevity.

The device operates from a single **5V supply** for both its analog and digital sections, simplifying power architecture. It features a versatile **serial interface** that is compatible with SPI, QSPI, and MICROWIRE protocols, enabling easy connection to a wide array of microcontrollers and digital signal processors (DSPs). For low-power applications, the LTC1859 offers a **nap mode and a sleep mode**, reducing the supply current to just **20µA and 1µA** respectively, which is ideal for battery-powered or power-sensitive systems.

Housed in a compact **48-lead SSOP package**, the LTC1859CG#TRPBF is designed for space-constrained applications. Its specified operating temperature range of **0°C to 70°C** caters to the needs of commercial and industrial systems.

**ICGOOODFIND:** The LTC1859CG#TRPBF integrates a high-performance 12-bit ADC with an exceptionally flexible and protected 16-channel input multiplexer. Its combination of **high integration, robust fault protection, and software-configurable input modes** makes it an outstanding choice for complex data acquisition systems where reliability, channel count, and accuracy are paramount.

**Keywords:** **12-Bit ADC**, **16-Channel Multiplexer**, **SPI Interface**, **±25V Fault Protection**, **100ksps Throughput**