AD7237ABN

Overview

The AD7237ABN is a dual 12-bit voltage-output digital-to-analog converter (DAC) housed in a 24-pin plastic DIP package. It integrates two LC2MOS DACs, on-chip voltage reference, and output amplifiers. The device supports single or dual supply operation with VDD ranging from +10.8 V to +16.5 V and VSS from –10.8 V to –16.5 V. It features an 8-bit parallel loading structure with double-buffered input latches for microprocessor compatibility. Static performance includes ±0.5 LSB relative accuracy and a typical settling time of 8 µs to within ±1/2 LSB.

Feature Summary

• Dual 12-bit DAC architecture with integrated 5 V Zener reference and buffered outputs
• Parallel interface with 8-bit data bus and double-buffered input latches for simplified microprocessor connection
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar)
• Industrial temperature range of –40 °C to +85 °C with ±0.5 LSB maximum relative accuracy

Applications

• Microprocessor-based data acquisition systems requiring dual channel analog output
• Programmable power supplies and signal generators
• Industrial process control loops with bipolar or unipolar requirements

Procurement Notes

Verify the ordering suffix 'N' corresponds to the 24-pin plastic DIP package. Confirm the 'B' grade designation indicates ±0.5 LSB relative accuracy. Ensure the application environment remains within the specified –40 °C to +85 °C operating temperature range. Check that power supply voltages adhere to the absolute maximum ratings to prevent device damage.

Selection Notes

Select the AD7237ABN over the AD7247A when interfacing with 8-bit microprocessors due to its double-buffered 8+4 bit loading structure. Choose this variant if a plastic DIP package is required for through-hole mounting. Verify that the required output current capability meets the amplifier specifications, as the outputs can drive +10 V across a 2 kΩ load to ground.

Part Context

This component belongs to the AD7237A/AD7247A family of enhanced dual 12-bit DACPORTs. It improves upon previous industry standards by supporting 12 V to 15 V supply operations and offering faster interface times. The LC2MOS process combines precision bipolar circuits with low-power CMOS logic to achieve high reliability and space savings compared to multichip designs.

Replacement Considerations

The AD7237ABR is a direct surface-mount replacement in the 24-SOIC package with identical electrical characteristics. For extended temperature applications, the AD7237ATQ covers –55 °C to +125 °C. MIL-STD-883 Class B processed versions are available by adding /883B to the part number.