AD7237KN

Overview

The AD7237KN is a dual 12-bit Digital-to-Analog Converter (DAC) housed in a 24-pin Plastic DIP package. It integrates two complete DAC channels with on-chip voltage references and output amplifiers, fabricated using LC2MOS technology. The device supports parallel word input loading with an 8+4 bit structure for microprocessor interfacing. Key electrical parameters include a supply voltage range of +10.8 V to +16.5 V for VDD and -10.8 V to -16.5 V for VSS. Static performance specifications feature a relative accuracy of ±1 LSB maximum and a settling time of 8 µs typical. The component operates within an industrial temperature range of -40 °C to +85 °C.

Feature Summary

• Dual 12-bit DAC architecture with integrated 5 V Zener reference and buffered output amplifiers
• Parallel interface with double-buffered 8+4 loading structure compatible with 8-bit microprocessors
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar)
• LC2MOS process technology ensuring low power consumption and high reliability

Applications

• Industrial process control systems requiring precise analog signal generation
• Microprocessor-based data acquisition and control interfaces
• Programmable power supplies and instrumentation equipment

Procurement Notes

Verify the specific suffix 'KN' against the manufacturer's ordering guide, as standard listings typically utilize 'AN' for plastic DIP variants. Confirm that the required accuracy grade matches the ±1 LSB specification associated with this package type. Ensure ESD precautions are observed during handling due to CMOS sensitivity. Cross-reference the pinout configuration for the AD7237A variant to ensure compatibility with the target circuit design.

Selection Notes

Select the AD7237KN when a dual-channel solution is required to save board space compared to discrete multi-chip designs. Choose this part over the AD7247A if the system utilizes an 8-bit data bus, as the AD7237A's 8+4 loading structure simplifies software timing. Verify that the required output swing and load conditions (e.g., 2 kΩ to GND) fall within the amplifier capabilities specified in the datasheet.

Part Context

The AD7237KN belongs to the AD7237A/AD7247A family of Dual 12-Bit DACPORTs. This series represents an enhanced version of the industry-standard AD7237/AD7247, offering improved interface speeds and operation from 12 V to 15 V supplies. The 'KN' designation specifically identifies the component as a dual 12-bit DAC in a 24-pin plastic dual-in-line package (DIP).

Replacement Considerations

The AD7247A serves as a functional alternative for systems capable of handling 12-bit parallel data directly, eliminating the need for the 8+4 loading sequence. For higher precision requirements, the AD7237ABN variant offers ±1/2 LSB accuracy. Military-grade versions are available by adding the /883B suffix to the part number.