AD7249BRZ

Overview

The AD7249BRZ is a dual 12-bit voltage-output digital-to-analog converter (DAC) from Analog Devices, fabricated on LC2MOS CMOS technology. It integrates two DAC channels with output amplifiers and an internal Zener voltage reference, eliminating the need for external trimming. The device supports single or dual supply operation, offering selectable output ranges of 0 V to +5 V, 0 V to +10 V, and ±5 V. It features a 3-wire serial interface compatible with DSPs and microcontrollers, supporting data rates up to 2 MHz for a 125 kHz DAC update rate. The B version guarantees ±1/2 LSB relative accuracy and operates within a temperature range of -40°C to +85°C.

Feature Summary

• Dual 12-bit DAC channels with integrated output amplifiers and internal 5 V Zener reference
• Three selectable output voltage ranges per channel: 0 V to +5 V, 0 V to +10 V, and ±5 V
• 3-wire serial interface with 125 kHz update rate and automatic or manual latch update modes
• B-grade performance with ±1/2 LSB maximum relative accuracy and ±0.9 LSB maximum differential nonlinearity

Applications

• Process control systems requiring precise analog signal generation
• Industrial automation equipment with multi-channel I/O ports
• Digital signal processing systems needing serially controlled analog outputs

Procurement Notes

Verify the specific suffix 'BRZ' corresponds to the industrial temperature grade (-40°C to +85°C), SOIC-16 package, and RoHS compliance status as defined in the official datasheet. Confirm that the B-version specifications, particularly the ±1/2 LSB relative accuracy, meet the design requirements rather than the A-version's ±1 LSB specification.

Selection Notes

Select the AD7249BRZ when dual isolated 12-bit channels are required in a compact 16-lead SOIC package. Ensure the application can accommodate the specified power supply ranges (+11.4 V to +15.75 V for VDD) and that the serial interface timing constraints align with the host processor's capabilities. Consider the internal reference stability if system-level noise sensitivity is critical.

Part Context

The AD7249 belongs to the DACPORT family of monolithic CMOS converters. The BRZ designation indicates the commercial/industrial grade variant packaged in lead-free SOIC-16. It shares architectural similarities with single-channel variants like the AD7243 but provides two independent channels with individual offset resistor controls for flexible range configuration.

Replacement Considerations

The AD7249ARZ is a direct functional substitute with identical pinout and specifications, differing primarily in the A-grade accuracy rating of ±1 LSB relative accuracy compared to the B-grade's ±1/2 LSB.