AD7846BP

Overview

The AD7846BP is a 16-bit voltage output digital-to-analog converter (DAC) manufactured by Analog Devices Inc. utilizing LC2MOS technology. It features a segmented architecture ensuring monotonicity over temperature, with an integral linearity error of ±2 LSBs for the B version. The device includes an on-chip output amplifier configurable for unipolar (0 V to +5 V/+10 V) or bipolar (±5 V/±10 V) ranges. 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 settling time of 6 μs, power dissipation of 100 mW, and a microprocessor-compatible interface with readback capability.

Feature Summary

• 16-bit resolution with guaranteed monotonicity over temperature.
• Segmented architecture providing ±2 LSBs integral linearity error (B version).
• On-chip output amplifier supporting unipolar and bipolar configurations.
• Microprocessor interface with readback capability for system diagnostics.

Applications

• Closed-loop control systems requiring high accuracy.
• Automated Test Equipment (ATE) utilizing readback functions.
• Position measurement applications using LVDTs.
• Multiplying DAC circuits for signal processing.

Procurement Notes

Verify the specific package type required, as the AD7846 family is available in plastic DIP, ceramic DIP, and PLCC formats. Confirm that the B suffix corresponds to the industrial temperature range (-40°C to +85°C) and ±2 LSB linearity specification. Ensure supply voltages match the specified ranges for analog and digital domains before integration.

Selection Notes

Select the AD7846BP when bipolar output ranges or multiplying capabilities are needed alongside 16-bit precision. The B version offers tighter linearity specifications compared to the K version. Consider the internal deglitching feature which holds the output during code transitions, reducing glitch impulse artifacts at the expense of approximately 2.5 μs hold time.

Part Context

The AD7846 is part of Analog Devices' LC2MOS DAC family, designed for low power and high accuracy. It distinguishes itself from standard R-2R architectures by using a segmented design where MSBs select resistor string segments, ensuring monotonicity without requiring tight matching of all resistors. This makes it suitable for applications demanding stability across wide temperature variations.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD7846KP (plastic DIP, commercial temp) or AD7846JP (ceramic DIP). For different packages, the AD7846JPZ (PLCC) offers similar electrical characteristics but requires footprint adaptation. Cross-vendor equivalents like the LTC1650 offer serial interfaces but differ in architecture and performance metrics.