AD7237AAN

Overview

The AD7237AAN is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, housed in a 24-pin plastic DIP package. It integrates two CMOS DACs with on-chip buffered output amplifiers and a Zener voltage reference. The device supports single or dual supply operation, typically ranging from +12 V to +15 V for VDD and 0 V or -12 V to -15 V for VSS. Key electrical parameters include a maximum relative accuracy of ±1 LSB, a typical settling time of 8 µs, and a power dissipation of approximately 165 mW in single-supply mode. The interface utilizes an 8-bit data bus with double buffering for microprocessor compatibility.

Feature Summary

• Dual 12-bit architecture with integrated buffered output amplifiers and internal 5 V reference
• Double-buffered parallel interface designed for 8-bit microprocessor data buses
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar)
• Industrial temperature range operation from -40 °C to +85 °C

Applications

• Process control systems requiring multi-channel analog output
• Microprocessor-based instrumentation and test equipment
• Programmable gain amplifier biasing and offset adjustment circuits

Procurement Notes

Verify the specific suffix 'AN' corresponds to the plastic DIP-24 package and industrial temperature grade (-40 °C to +85 °C). Confirm that the required output configuration matches the available unipolar or bipolar ranges supported by the ROFS pins. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS input structures.

Selection Notes

Select the AD7237AAN when interfacing with 8-bit microprocessors requiring double-buffered data loading. Choose this component over the AD7247A if the system design necessitates separate reference inputs for each DAC channel rather than a common reference. Verify that the power supply rails meet the minimum requirements of +10.8 V for VDD and appropriate negative rail for bipolar operation.

Part Context

The AD7237AAN belongs to the AD7237A/AD7247A family of LC2MOS DACPORTs. It serves as the enhanced version of the legacy AD7237, offering improved interface speeds and wider supply voltage tolerance. The 'A' designation indicates the industrial temperature grade, while 'N' specifies the plastic dual-in-line package format.

Replacement Considerations

The legacy AD7237 is functionally similar but lacks the improved interface timing and extended supply voltage range. For direct pin-compatible upgrades within the same package and temperature grade, verify performance against the AD7237A specifications.