AD1674KNZ

Overview

The AD1674KNZ is a monolithic 12-bit analog-to-digital converter manufactured by Analog Devices Inc. It operates with a sampling rate of 100 kS/s and features an integrated sample-and-hold amplifier (SHA) supporting full Nyquist bandwidth. The device utilizes a successive approximation register (SAR) architecture with a parallel digital interface. It accepts single-ended inputs across four calibrated ranges: 0 V to +10 V, 0 V to +20 V, –5 V to +5 V, and –10 V to +10 V. Power requirements include a +5 V logic supply and ±11.4 V to ±16.5 V analog supplies. The component is housed in a 28-lead plastic DIP package and supports commercial temperature grades.

Feature Summary

• Integrated Sample-and-Hold Amplifier (SHA) with 1 MHz full power bandwidth
• Industry standard pinout compatible with AD574A and AD674A
• Internal 10 V reference voltage with external or internal reference options
• Three-state output buffers for direct microprocessor interfacing

Applications

• Signal processing systems requiring AC and DC specifications
• Traditional DC measurement applications
• Industrial data acquisition systems

Procurement Notes

Verify the specific temperature grade and package variant against project requirements. The 'KNZ' suffix indicates a plastic DIP package within the K grade (0°C to +70°C). Confirm that the ordering suffix aligns with the desired mechanical form factor and environmental operating range as defined in the manufacturer's ordering guide.

Selection Notes

Select based on required input voltage span and temperature range. The AD1674K supports 0°C to +70°C operation, while other grades like AD1674T support –55°C to +125°C. Ensure the system design accommodates the specified analog supply voltages (+11.4 V to +16.5 V) and logic supply (+5 V). Verify interface compatibility with the target microprocessor using the provided control logic truth table.

Part Context

The AD1674 series comprises complete 12-bit ADCs featuring onboard SHA, reference, clock, and output buffers. The family includes multiple temperature grades (J, K, A, B, T) and package options (Plastic DIP, Plastic SOIC, Ceramic DIP). The AD1674KNZ specifically denotes the K grade device in a 28-lead plastic dual in-line package.

Replacement Considerations

The AD1674 is pin-compatible with the AD574A and AD674A. However, the AD1674 offers faster conversion rates due to its integrated SHA. When substituting, verify that the timing parameters and control logic levels match the existing system design.