AD7837AN

Overview

The AD7837AN is a dual 12-bit multiplying digital-to-analog converter (MDAC) from Analog Devices, housed in a 24-lead Plastic DIP (N-24) package. It utilizes LC2MOS technology and features an R-2R segmented architecture with integrated output amplifiers. The device operates on ±15 V supplies (range ±14.25 V to ±15.75 V) within the industrial temperature range of –40 °C to +85 °C. Key electrical specifications include a typical voltage output settling time of 3 µs, a slew rate of 11 V/µs, and relative accuracy of ±1 LSB. It employs a parallel interface structure requiring five memory addresses for microprocessor interfacing.

Feature Summary

• Dual 12-bit MDACs with buffered voltage outputs and internal R-2R ladder architecture
• Parallel loading structure compatible with 8-bit microprocessor data buses
• Simultaneous update capability via asynchronous LDAC input
• Industrial temperature range operation (-40 °C to +85 °C)

Applications

• Automatic Test Equipment
• Programmable Gain Amplifiers
• Function Generation and Waveform Reconstruction

Procurement Notes

Verify component authenticity through authorized distributors or manufacturer channels. Confirm the N-24 plastic DIP package designation matches system requirements. Check for ESD sensitivity precautions during handling. Ensure supply voltages remain within the specified ±14.25 V to ±15.75 V range to maintain performance specifications.

Selection Notes

Select the AD7837AN when a parallel interface with 8-bit bus compatibility is required. Choose this model over the AD7847 if simultaneous updating of multiple DACs via a common LDAC line is necessary. Verify that the ±1 LSB relative accuracy meets system linearity requirements. Ensure the PCB layout supports the 24-lead DIP footprint and provides adequate decoupling for ±15 V supplies.

Part Context

The AD7837AN belongs to the AD7837/AD7847 family of complete dual 12-bit MDACs. The 'AN' suffix specifically denotes the Plastic DIP (N-24) package variant with industrial temperature rating. This distinguishes it from the SOIC (AR) and Cerdip (AQ) packages within the same series. The device shares functional characteristics with the AD7847 but differs in its parallel input loading structure.

Replacement Considerations

Direct pin-compatible replacements include other AD7837 variants such as AD7837AR (SOIC) or AD7837AQ (Cerdip), provided the package type is adapted. The AD7847 offers similar functionality but uses a different serial/parallel interface logic. Verify package dimensions and pinout compatibility before substitution.