AD1674AR

Overview

The AD1674AR is a monolithic 12-bit, 100 kSPS analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It integrates a sample-and-hold amplifier (SHA), a 10 V reference, and three-state output buffers. The device supports unipolar (0–10 V, 0–20 V) and bipolar (±5 V, ±10 V) input ranges with an internal reference voltage of 10 V. It operates on +5 V logic and ±12 V to ±15 V analog supplies. The AD1674AR features industry-standard pinout compatibility with the AD574A and AD674A, ensuring direct replacement in existing designs while offering faster conversion rates.

Feature Summary

• Integrated Sample-and-Hold Amplifier (SHA) supporting full Nyquist bandwidth without user wait-states
• Industry-standard pinout compatible with AD574A and AD674A
• Fully specified for AC parameters including S/(N+D) ratio, THD, and IMD
• Flexible digital interface with 8- or 16-bit microprocessor compatibility via three-state buffers

Applications

• Signal processing systems requiring high dynamic range
• Traditional DC measurement applications
• Data acquisition systems with dedicated input ports
• Industrial instrumentation utilizing standard ADC interfaces

Procurement Notes

Verify the specific suffix 'AR' corresponds to the Plastic SOIC package and -40°C to +85°C temperature grade as defined in the ordering guide. Confirm power supply requirements match the specified VCC (+11.4V to +16.5V) and VEE (-16.5V to -11.4V) ranges. Ensure ESD precautions are observed during handling due to the sensitivity of the BiMOS II process technology.

Selection Notes

Select the AD1674AR when system design requires compatibility with legacy AD574A/AD674A footprints but demands improved performance through integrated SHA and AC specifications. Choose this model for applications needing calibrated unipolar/bipolar ranges without external scaling resistors. Consider the -40°C to +85°C operating range suitability for commercial and industrial environments compared to military grades.

Part Context

The AD1674 series utilizes Analog Devices’ BiMOS II process, combining high-performance bipolar analog circuitry with digital CMOS logic. This architecture enables the integration of precision laser-trimmed resistors and offset calibration circuits on a single die. The device family includes multiple temperature grades and package options, with the AR variant specifically designated for plastic surface-mount applications within the extended commercial temperature range.

Replacement Considerations

The AD1674AR is pin-compatible with the AD574A and AD674A. When replacing these older components, verify that the host system can accommodate the slightly different control logic timing and power supply configurations. No functional changes are required for basic data acquisition tasks, but AC performance improvements should be leveraged in signal processing designs.