AD7225CRS

Overview

The AD7225CRS is an LC2MOS quad 8-bit digital-to-analog converter featuring integrated output buffer amplifiers and double-buffered interface logic. It supports simultaneous update of all four channels via a common LDAC signal. The device operates with single or dual supplies, requiring VDD from 11.4 V to 16.5 V and VSS at -5 V for specified performance. Each DAC has a separate reference input (VREFx) ranging from 2 V to (VDD - 4 V). Static accuracy includes ±1 LSB relative accuracy and ±1 LSB differential nonlinearity for the C version. Dynamic performance specifies a settling time of 4 μs to ±½ LSB.

Feature Summary

• Four independent 8-bit voltage-output DACs with integrated unity-gain buffer amplifiers
• Double-buffered interface allowing simultaneous update of all outputs via LDAC
• Separate reference input terminals for each channel (VREFA–VREFD)
• TTL and CMOS compatible digital inputs with microprocessor-compatible timing

Applications

• Programmable transversal filters
• Digital word multiplication circuits
• Multi-channel data acquisition systems requiring synchronized updates

Procurement Notes

Verify the specific package suffix associated with the 'CRS' designation against the manufacturer's ordering guide, as standard documentation lists SSOP, SOIC, PDIP, and CERDIP options. Confirm that the supply chain source provides the Rev. C datasheet specifications, particularly regarding the ±1 LSB relative accuracy guaranteed for the C grade. Ensure compatibility with the required 11.4 V to 16.5 V VDD range and -5 V VSS requirement for optimal performance.

Selection Notes

Select this component when four synchronized 8-bit conversions are required on a single chip. The C version offers improved static accuracy (±1/2 LSB relative accuracy) compared to K/B versions (±1 LSB). Ensure the application can provide a stable reference voltage between 2 V and (VDD - 4 V). For bipolar output applications, external resistors and amplifiers are required per channel, as the DAC outputs are unipolar by default.

Part Context

The AD7225 belongs to Analog Devices' LC2MOS family of high-speed linear-compatible CMOS data converters. This process technology integrates precision analog circuitry with high-speed digital logic on a single monolithic chip. The quad configuration reduces board space compared to discrete solutions, optimizing layout with analog inputs/outputs grouped at one end and digital inputs at the other.

Replacement Considerations

The AD7225CQ is a ceramic equivalent within the same series. For higher resolution needs, consider the AD7834 (14-bit) or AD7836 (14-bit), though these differ in pinout and architecture. Single-channel alternatives include the AD7224, while octal configurations are available in the AD7228 series.