AD7846KP-REEL

Overview

The AD7846KP-REEL 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 (0 V to +5 V/+10 V) or bipolar (±5 V/±10 V) ranges via the RIN pin. 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, consuming typically 100 mW. Key specifications include a settling time of 6 μs to 0.006% FSR and microprocessor-compatible parallel I/O with readback capability.

Feature Summary

• 16-bit resolution with guaranteed monotonicity over temperature using segmented architecture
• On-chip buffered output amplifier supporting unipolar and bipolar configurations
• Microprocessor interface with readback capability for diagnostic routines
• Low power consumption of 100 mW typical

Applications

• Closed-loop control systems requiring high accuracy
• Automated Test Equipment (ATE) utilizing readback functions
• Position measurement applications with LVDTs
• Precision instrumentation signal chains

Procurement Notes

Verify the 'K' suffix indicates the commercial temperature grade (0°C to +70°C) and ±2 LSB INL specification. Confirm the REEL suffix denotes tape-and-reel packaging. Ensure supply voltages match the specified ranges: VDD/VSS at ±11.4 V to ±15.75 V and VCC at +4.75 V to +5.25 V. Check RoHS compliance status as manufacturing processes may vary.

Selection Notes

Select the AD7846KP-REEL when 16-bit monotonicity and low power are critical. The K version offers tighter linearity (±2 LSB) compared to J versions (±12 LSB). Use the bipolar configuration for signals crossing zero; otherwise, use unipolar. Ensure the load does not exceed 2 kΩ resistive or 1000 pF capacitive limits without external buffering. Verify that the system timing meets the 60 ns CS pulse width requirement.

Part Context

The AD7846 is part of Analog Devices' LC2MOS DAC family, designed for high-accuracy applications where power dissipation must be minimized. Unlike standard R-2R architectures, its segmented design ensures monotonicity without tight matching requirements. The KP variant specifically refers to the plastic package form factor within the commercial temperature range, distinct from ceramic or PLCC options.

Replacement Considerations

Direct replacements require matching 16-bit resolution, LC2MOS-like monotonicity, and compatible 28-pin packages. Compare INL/DNL specs carefully, as lower-grade parts (e.g., J version) have significantly wider error bounds. Verify pin compatibility for VREF, RIN, and digital interfaces if substituting with other 16-bit DACs.