AD7237JNZ

Overview

The AD7237JNZ is a dual 12-bit voltage-output digital-to-analog converter (DAC) from the DACPORT family, manufactured by Analog Devices. It integrates two complete 12-bit CMOS DACs with on-chip voltage reference and output amplifiers on a single monolithic LC2MOS chip. The device supports parallel data loading via an asynchronous LDAC signal for simultaneous updates. It operates from supply voltages 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 resolution of 12 bits, a maximum settling time of 8 µs, and a typical power dissipation of 165 mW in single-supply mode. The unit is housed in a 24-pin plastic DIP package.

Feature Summary

• Dual 12-bit architecture with integrated 5 V Zener reference and buffered output amplifiers
• Parallel interface with double-buffered input latches and asynchronous LDAC control
• Configurable output ranges: 0 V to +5 V, 0 V to +10 V (unipolar), and ±5 V (bipolar)
• LC2MOS fabrication process ensuring monotonicity and low power consumption

Applications

• Industrial process control systems requiring precise analog signal generation
• Microprocessor-based instrumentation with direct 8-bit or 16-bit bus interfacing
• Multi-channel data acquisition systems needing synchronized DAC updates

Procurement Notes

Verify the specific suffix 'J' against the manufacturer's ordering guide to confirm the temperature range and accuracy grade. The 'N' suffix indicates a plastic DIP-24 package. Ensure that the application environment remains within the specified industrial temperature limits (-40 °C to +85 °C) for this variant. Check for ESD sensitivity precautions during handling and storage.

Selection Notes

Select the AD7237JNZ 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 microprocessor data bus, as the AD7237A features a double-buffered interface optimized for such architectures. Verify that the required output voltage swing matches the available unipolar or bipolar configurations supported by the ROFS pins.

Part Context

The AD7237JNZ belongs to the enhanced AD7237A/AD7247A series, which improves upon the original industry-standard AD7237/AD7247 parts. These enhancements include operation from lower 12 V supplies, faster interface times with a typical 30 ns data setup time, and improved reference stability with respect to supply voltage variations. The JNZ designation specifically identifies the industrial temperature grade version in a plastic DIP package.

Replacement Considerations

The AD7237ANZ serves as a direct functional replacement within the same package and temperature range, though it may have different accuracy grades. For extended temperature applications, the AD7237ATQ is available. The AD7247A offers similar performance but uses a single 12-bit latch structure instead of the double-buffered 8+4 structure.