AD7228ABPZ

Overview

The AD7228ABPZ is an octal 8-bit voltage-mode digital-to-analog converter (DAC) fabricated on LC2MOS CMOS technology. It integrates eight DACs with output buffer amplifiers and interface logic on a single 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 three address lines (A0–A2). It supports both single-supply operation (VDD = 13.5 V to 16.5 V, VSS = GND) and dual-supply operation (VDD = 10.8 V to 16.5 V, VSS = −5.5 V to −4.5 V). Key electrical parameters include a maximum settling time of 5 µs for positive full-scale changes and ±1 LSB total unadjusted error in L/C versions.

Feature Summary

• Octal architecture with eight independent 8-bit DACs and integrated unity-gain output buffers.
• Microprocessor-compatible parallel interface with TTL/CMOS input levels and 95 ns write pulse width.
• Flexible power supply options supporting single (+15 V) or dual (+15 V/−5 V) configurations.
• Guaranteed monotonic performance with ±1 LSB differential nonlinearity (L/C versions).

Applications

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

Procurement Notes

Verify the specific grade suffix 'B' against the manufacturer's ordering guide to confirm static performance tolerances, such as Total Unadjusted Error and Relative Accuracy. Ensure the package type corresponds to the 24-lead Plastic Dual In-Line (PDIP) form factor. Confirm that the application environment remains within the specified operating temperature range of −40°C to +85°C.

Selection Notes

Select the AD7228ABPZ when eight isolated 8-bit channels are required without external buffering components. Choose this part over higher-resolution variants if board space is constrained and 8-bit precision suffices. Verify that the reference voltage source can maintain low impedance under varying load conditions, as the VREF input capacitance is code-dependent. Ensure the microprocessor interface timing meets the minimum setup and hold requirements for the WR signal.

Part Context

The AD7228 series belongs to Analog Devices' LC2MOS family of high-speed linear-compatible CMOS converters. This technology allows the integration of precision analog circuits with high-speed digital logic on a monolithic chip. The ABPZ designation indicates a specific performance grade within the AD7228 lineup, housed in a standard 24-lead PDIP package suitable for through-hole mounting.

Replacement Considerations

Direct pin-for-pin replacements within the same package must be verified against the official Ordering Guide. Other members of the AD7228 family, such as the AD7228ACPZ or AD7228LNZ, may offer different performance grades or package types but share the same functional architecture. Cross-referencing specific electrical limits like settling time and error specifications is essential before substitution.