AD7225KR-REEL

Overview

The AD7225KR-REEL is a quad 8-bit voltage-output digital-to-analog converter (DAC) fabricated on an LC2MOS process. It integrates four DACs with output buffer amplifiers and double-buffered interface logic on a single chip. The device supports simultaneous update of all outputs via the LDAC signal and features separate reference inputs for each channel. It operates with single or dual supplies, typically requiring VDD between 11.4 V and 16.5 V. Key static performance metrics include a total unadjusted error of ±2 LSB and a settling time of 4 µs max. The KR suffix denotes the commercial temperature range version (-40°C to +85°C).

Feature Summary

• Quad 8-bit resolution with integrated output buffer amplifiers.
• Double-buffered interface allows simultaneous update of all four channels.
• Separate reference input for each DAC channel.
• Compatible with TTL and 5 V CMOS logic levels.

Applications

• Programmable transversal filters.
• Digital word multiplication circuits.
• Microprocessor-controlled analog signal generation.

Procurement Notes

Verify that the 'KR' suffix corresponds to the commercial temperature grade (-40°C to +85°C) as specified in the manufacturer's ordering guide. Confirm the REEL packaging format matches the required production line specifications. Ensure the supply voltage range aligns with the specified 11.4 V to 16.5 V for optimal performance.

Selection Notes

Select this component when a quad-channel 8-bit DAC with independent reference inputs is required. The double-buffering feature is critical for applications demanding synchronized output updates. Consider the 4 µs settling time and ±2 LSB total unadjusted error for precision requirements. Ensure the design accommodates the necessary power supply rails and reference voltage ranges (2 V to VDD - 4 V).

Part Context

The AD7225 belongs to Analog Devices' family of high-speed, linear-compatible CMOS data converters. The KR variant specifically indicates the commercial temperature range extension. This part is designed to reduce board space by integrating multiple converters and amplifiers on one monolithic chip, optimizing layout with separated analog and digital sections.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult the manufacturer's current product selector guide for cross-references based on specific pinout and electrical parameter compatibility.

FAQ

What is the maximum settling time for the AD7225?

The maximum voltage output settling time is 4 µs, measured to within ±½ LSB with a 10 V reference.

How does the double-buffered interface work?

Each channel has an input register and a DAC register. Data is loaded into the input register via WR, and transferred simultaneously to all DAC registers via the LDAC signal, allowing synchronized output updates.

Can the AD7225 operate with a single supply?

Yes, it can operate with a single supply (e.g., VDD = 15 V, VSS = 0 V), though dual supplies may offer improved zero-code error and sink capability.