AD7837AQ

The AD7837AQ is a dual 12-bit multiplying digital-to-analog converter (DAC) from Analog Devices, combining two complete voltage‑output DACs with on‑chip output amplifiers in a ceramic dual‑in‑line package (CDIP). Each channel accepts a separate external reference input, allowing four‑quadrant multiplication behavior where the reference can be a fixed DC level or a time‑varying AC signal up to ±10 V. The 12-bit data for both DACs is loaded via an 8‑bit parallel interface with double‑buffered latches, supporting simultaneous update of the outputs. The integrated output amplifiers are designed to drive capacitive loads and deliver voltage swings close to the supply rails, typically operating from dual supplies in the ±12 V to ±15 V range. Monotonicity and low glitch energy make the device well-suited for precision settling applications, while the hermetic CDIP package ensures robust operation over the industrial temperature range (−40°C to +85°C).

Typical deployments for this family include closed‑loop process control systems, automatic test equipment, programmable voltage references, and waveform generators in industrial automation, aerospace, and defense environments. The multiplying architecture is frequently exploited in servo loop applications, motor control, and precision attenuator circuits. From a procurement perspective, the AD7837AQ represents a mature product in a ceramic‑seal package that addresses high‑reliability requirements outside full military‐standard screening. Engineers specifying this device should evaluate long‑term availability and potential obsolescence risk, as older converter families can move to limited lifetime buy status. For programs requiring extended support, it is prudent to verify manufacturer lifecycle notices and consider whether a drop‑in replacement or custom screening of the industrial grade is viable.