AD7226KP

Overview

The AD7226KP is a monolithic quad 8-bit digital-to-analog converter (DAC) fabricated in LC2MOS process. It integrates four voltage-output DACs with buffer amplifiers and interface logic, requiring no external trims. The device features separate on-chip latches for each channel, controlled via a common 8-bit TTL/CMOS-compatible input port using address lines A0/A1 and write signal WR. Each output amplifier drives up to 5 mA. Static performance includes ±0.5 LSB relative accuracy and ±1 LSB differential nonlinearity under dual supply conditions (VDD = 11.4 V to 16.5 V, VSS = –5 V). Dynamic settling time is 4 µs max. The K version operates from –40°C to +85°C.

Feature Summary

• Four independent 8-bit DACs with integrated laser-trimmed output buffer amplifiers
• Microprocessor-compatible parallel interface with individual data latches per channel
• Single-supply or dual-supply operation capability with reference range of 2 V to 12.5 V
• Skinny 20-lead DIP package optimized for board layout with separated analog/digital sections

Applications

• Process control systems requiring multi-channel analog output
• Automatic test equipment for signal generation
• Automatic calibration of large system parameters such as gain and offset

Procurement Notes

Verify the 'K' suffix indicates the industrial temperature range (-40°C to +85°C) and PDIP-20 package configuration. Confirm that the specific revision of the datasheet matches the manufacturing lot requirements. Ensure power supply decoupling and ground management practices align with the application notes to maintain specified linearity and settling times.

Selection Notes

Select this component when four synchronized 8-bit voltage outputs are required in a compact form factor. The AD7226 is suitable for applications needing microprocessor compatibility without external latch circuitry. Consider the single-supply limitation near AGND if negative sink current is critical; a negative VSS rail improves zero code error and sink capability near ground.

Part Context

The AD7226 belongs to the Analog Devices LC2MOS family of precision data converters. It replaces earlier discrete solutions by integrating four DACs and op-amps into a single chip. The KP designation specifically refers to the plastic dual-in-line package variant within the broader AD7226 product line, which also includes SOIC, SSOP, and PLCC packages.

Replacement Considerations

Direct pin-compatible replacements include other quad 8-bit DACs from Analog Devices such as the AD7336 or AD7346, though interface logic and performance specifications may differ. Verify that substitute devices support the same parallel addressing scheme and output drive requirements.