AD693AE

Overview

The AD693AE is a monolithic signal conditioning circuit designed for loop-powered 4–20 mA sensor transmitters. It accepts low-level inputs from transducers and controls a standard two-wire current loop. The device features an instrumentation amplifier front end, a V/I converter, and a 6.2 V reference with up to 3.5 mA excitation current capability. Total unadjusted error is less than 0.5% of full scale at +25 °C and less than 0.75% over the industrial temperature range (-40 °C to +85 °C). Residual nonlinearity is under 0.05%. It supports precalibrated input spans of 30 mV or 60 mV via pin strapping and offers output spans of 4–20 mA, 0–20 mA, or 12 ± 8 mA. The component is housed in a 20-lead Leadless Ceramic Chip Carrier (LCCC) package.

Feature Summary

• Monolithic signal conditioning circuit integrating instrumentation amplifier, V/I converter, and voltage reference for complete transmitter functionality.
• Supports loop-powered two-wire operation with on-chip excitation capabilities and local-powered three-wire configurations.
• Features laser-trimmed thin-film resistors for high accuracy without requiring external calibration adjustments.
• Includes an auxiliary amplifier for transducer excitation and optional external pass transistor connection to minimize self-heating errors.

Applications

• Process control systems utilizing RTDs, bridges, and pressure transducers.
• Factory automation environments requiring standardized 4–20 mA signal transmission.
• System monitoring applications needing cost-effective signal conditioning solutions.

Procurement Notes

Verify the specific suffix AE corresponds to the 20-lead LCCC package configuration required for your design. Confirm that the operational voltage range and temperature specifications align with your system requirements before finalizing procurement. Ensure compatibility with existing PCB footprints for the ceramic side-brazed or leadless carrier packages.

Selection Notes

Select the AD693AE when a surface-mount or leadless ceramic option is preferred over DIP or Cerdip packages. Consider this model for applications requiring precise zero and span adjustments via pin strapping. Evaluate the need for an external pass transistor if operating near maximum power dissipation limits to ensure reliability within the specified temperature range.

Part Context

The AD693 series includes variants such as the AD693AD (Ceramic Side-Brazed DIP) and AD693AQ (Cerdip), all sharing identical electrical characteristics. The AE suffix specifically denotes the Leadless Ceramic Chip Carrier (LCCC) package option. This family serves as a replacement for discrete designs in industrial sensing applications.

Replacement Considerations

Public confirmed substitute part numbers include AD5748ACPZ, AD5750-2BCPZ, and AD5751ACPZ.