AD7846KPZ

Overview

The AD7846KPZ is a 16-bit voltage output digital-to-analog converter (DAC) manufactured by Analog Devices Inc. utilizing the LC2MOS process. It features a segmented architecture ensuring guaranteed 16-bit monotonicity over temperature with ±2 LSBs integral linearity error for K versions. The device includes an on-chip output amplifier configurable for unipolar or bipolar ranges, such as 0 V to +10 V or ±10 V. It operates with analog supplies of ±11.4 V to ±15.75 V and a digital supply of 4.75 V to 5.25 V. Key specifications include a typical power dissipation of 100 mW, a settling time of 6 μs to 0.006% FSR, and a microprocessor-compatible interface with readback capability.

Feature Summary

• 16-bit resolution with guaranteed monotonicity over temperature
• ±2 LSBs maximum integral nonlinearity error for K grade
• Microprocessor interface with I/O latch readback function
• Low power consumption of 100 mW typical

Applications

• Closed-loop control systems requiring high accuracy
• Automatic test equipment (ATE) utilizing readback diagnostics
• Position measurement applications using LVDTs
• Multiplying DAC configurations for signal processing

Procurement Notes

Verify that the ordering suffix 'K' corresponds to the commercial temperature range of 0°C to +70°C, distinct from the 'A' or 'B' industrial grades (-40°C to +85°C). Confirm package availability matches the required footprint, as the AD7846 is offered in PDIP, CERDIP, PLCC, and LCC variants. Ensure supply chain sources provide original manufacturer documentation to validate revision history and pinout compatibility.

Selection Notes

Select the AD7846KPZ when 16-bit monotonicity and low power are critical constraints. The K version offers tighter linearity specs than J versions but lacks the extended temperature range of A/B versions. Consider the internal deglitcher which holds the output during transitions; if external synchronization is needed, LDAC timing must be managed. Verify load requirements against the 2 kΩ resistive and 1000 pF capacitive limits specified in the electrical characteristics.

Part Context

The AD7846 belongs to Analog Devices' precision DAC family built on the LC2MOS process. It distinguishes itself through a segmented resistor string architecture that ensures monotonicity without requiring complex trimming. The device supports both unipolar and bipolar output configurations via external reference connections. Its design emphasizes low power dissipation relative to its accuracy class, making it suitable for battery-operated or thermally constrained instrumentation.

Replacement Considerations

Direct replacements within the same package and pinout include the AD7846JNZ (commercial grade, wider INL) or AD7846ANZ/AD7846BNZ (industrial temperature grades). Cross-family alternatives like the AD5570 offer serial interfaces but differ in speed and architecture. Verify that substitute parts maintain the required 16-bit monotonicity and compatible logic levels.