AD7228ACR-REEL

Overview

The AD7228ACR-REEL is an octal 8-bit voltage-mode digital-to-analog converter (DAC) fabricated on LC2MOS technology. It integrates eight DAC channels with output buffer amplifiers and interface logic on a single monolithic chip, eliminating the need for external trims. The device features individual latches for each channel, controlled via a common 8-bit parallel data bus and address inputs (A0-A2). It supports microprocessor-compatible write pulses as short as 95 ns. Electrical specifications vary by grade: K/B versions exhibit ±2 LSB total unadjusted error, while L/C versions offer improved accuracy at ±1 LSB. The part operates from dual supplies (VDD 10.8–16.5 V, VSS -4.5 to -5.5 V) or a single 15 V supply, with reference voltages ranging from 2 V to 10 V.

Feature Summary

• Octal architecture containing eight independent 8-bit DACs with integrated unity-gain output buffers.
• Microprocessor-compatible parallel interface with TTL/CMOS levels and 95 ns minimum write pulse width.
• No user trims required; guaranteed monotonicity across the full output range.
• Flexible power supply options supporting dual rails (+15 V/-5 V) or single +15 V operation.

Applications

• Automated test equipment requiring multi-channel signal generation.
• Programmable power supplies and setpoint controllers.
• Industrial process control systems utilizing multiple analog outputs.

Procurement Notes

Verify the specific performance grade suffix (K, B, L, or C) against application requirements, as Total Unadjusted Error and settling times differ between grades. Confirm the package type corresponds to the 'CR' designation (SOIC-24) rather than other available variants like PLCC or PDIP. Ensure the reel quantity matches system assembly needs, as packaging configurations may vary.

Selection Notes

Select the L or C version if tighter static accuracy (±1 LSB TUE) is required compared to the standard K/B grade. For single-supply designs, ensure the reference voltage is maintained at 10 V to meet specified dynamic performance. Verify that the load resistance remains above 2 kΩ to guarantee proper amplifier operation and output swing capabilities.

Part Context

This component belongs to the AD7228 family of octal DACs manufactured by Analog Devices. The 'ACR' suffix indicates the commercial temperature range (-40°C to +85°C) and the SOIC-24 surface-mount package. The '-REEL' suffix denotes tape-and-reel packaging for automated surface-mount assembly.

Replacement Considerations

Direct pin-compatible replacements within the same family include AD7228KN (PDIP), AD7228AR (SOIC), and AD7228APZ (PLCC). Note that these alternatives may have different package footprints or thermal characteristics. Cross-family upgrades such as the AD7568 provide higher resolution but require interface redesign.