AD1674JRZ

Overview

The AD1674JRZ 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), an internal 10 V reference, and three-state output buffers. The device supports unipolar (0 V to +10 V, 0 V to +20 V) and bipolar (±5 V, ±10 V) input ranges with a parallel digital interface compatible with 8- and 16-bit microprocessors. It operates on +5 V logic and ±12 V or ±15 V analog supplies, dissipating up to 575 mW. The component is housed in a 28-lead plastic SOIC package.

Feature Summary

• Integrated 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 of 69 dB and THD of -90 dB
• Flexible digital interface with 3-state buffers for direct microprocessor connection

Applications

• Signal processing systems requiring 12-bit resolution at 100 kSPS
• Traditional DC measurement applications
• Microprocessor-based data acquisition systems

Procurement Notes

Verify the specific temperature grade suffix (e.g., J for commercial 0°C to +70°C) against system requirements. Confirm package type is 28-lead SOIC. Check for MIL-STD-883 screening if military specifications are required, as standard parts may differ from screened versions.

Selection Notes

Select based on required input range (unipolar vs. bipolar) and operating temperature. The AD1674J is suitable for commercial environments (0°C to +70°C). Ensure power supply rails match the ±12 V or ±15 V requirement for optimal performance. Verify interface compatibility with the target microprocessor's data bus width and control signals.

Part Context

The AD1674 is part of the AD1674 family of 12-bit ADCs. It is pin-compatible with industry standards like the AD574A but offers faster conversion rates due to its onboard SHA. Other variants include the AD1678 (12-bit, 1 MSPS) and AD1679 (14-bit). The JRZ suffix indicates the Plastic SOIC package variant.

Replacement Considerations

Direct pin-compatible replacements include the AD574A and AD674A, though these lack the integrated SHA and have slower conversion times. For higher speed, consider the AD1678. Verify that any substitute meets the AC specification requirements if dynamic performance is critical.