AD1674KN

Overview

The AD1674KN is a monolithic 12-bit, 100 kSPS analog-to-digital converter manufactured by Analog Devices Inc. It integrates a sample-and-hold amplifier (SHA), a 10 V reference, and three-state output buffers within a 28-lead plastic DIP package. The device operates with +5 V logic supply and ±12 V to ±15 V analog supplies. It supports unipolar (0 V to +10 V, 0 V to +20 V) and bipolar (±5 V, ±10 V) input ranges. Key specifications include ±1/2 LSB integral nonlinearity, 70 dB signal-to-noise ratio, and full AC/DC characterization for precision measurement applications.

Feature Summary

• Integrated SHA supporting full Nyquist bandwidth without user wait-states
• Industry standard pinout compatible with AD574A and AD674A
• Flexible digital interface with 8-bit or 12-bit microprocessor compatibility
• Factory calibrated for four input ranges: 0–10 V, 0–20 V, ±5 V, ±10 V

Applications

• Signal processing systems requiring high dynamic performance
• Traditional DC measurement instrumentation
• Industrial process control data acquisition
• Automatic test equipment

Procurement Notes

Verify the specific suffix 'KN' corresponds to the 0°C to +70°C temperature grade and 28-lead plastic DIP package. Confirm that the ordering code matches the required INL specification of ±1/2 LSB and S/(N+D) of 70 dB. Ensure power supply requirements align with the specified ±12 V to ±15 V analog rails and +5 V logic rail.

Selection Notes

Select the AD1674KN when industry-standard pin compatibility with legacy AD574A/AD674A designs is required alongside improved conversion speed. Choose this component for applications needing integrated calibration for multiple voltage spans without external scaling resistors. Consider the commercial temperature range (0°C to +70°C) and plastic packaging constraints during system design.

Part Context

The AD1674 series utilizes Analog Devices’ BiMOS II process, combining high-performance bipolar analog circuitry with digital CMOS logic. The KN variant represents the commercial grade version housed in a standard plastic dual in-line package, distinct from the hermetically sealed ceramic options available for industrial and military temperature grades.

Replacement Considerations

The AD1674KN is pin-compatible with the AD574A and AD674A. Designers replacing these legacy parts should verify that the faster conversion rate and integrated SHA do not require timing adjustments in existing control logic.