AD1674JR

Overview

The AD1674JR is a monolithic 12-bit analog-to-digital converter featuring an onboard sample-and-hold amplifier (SHA) and a 10 V reference. It operates with +5 V logic and ±12 V or ±15 V analog supplies, delivering a conversion rate of 100 kSPS. The device supports unipolar (0 V to +10 V/+20 V) and bipolar (±5 V/±10 V) input ranges via calibrated internal resistors. Integral nonlinearity is specified at ±1 LSB for the J grade, with a full-power bandwidth of 1 MHz. It utilizes a parallel digital interface compatible with 8- and 16-bit microprocessors.

Feature Summary

• Integrated SHA supporting full Nyquist bandwidth without wait-states
• Industry standard pinout compatible with AD574A and AD674A
• Calibrated input ranges: 0–10 V, 0–20 V, ±5 V, and ±10 V
• Three-state output buffers for direct microprocessor connection

Applications

• Signal processing systems requiring AC and DC specifications
• Traditional DC measurement applications
• Microprocessor-based data acquisition systems

Procurement Notes

Verify the specific suffix 'JR' corresponds to the plastic SOIC package and commercial temperature range (0°C to +70°C). Confirm availability of the exact revision level required for design compatibility. Check for MIL-STD-883 screened variants if military-grade reliability is necessary, as these utilize different ordering codes.

Selection Notes

Select based on required input voltage span; use 10 VIN for 10 V ranges and 20 VIN for 20 V ranges. Ensure power supply rails match the ±12 V or ±15 V requirements for optimal performance. Consider the A or B grades for extended industrial temperatures (-40°C to +85°C) or T grade for military ranges (-55°C to +125°C) if environmental conditions exceed the J grade limits.

Part Context

The AD1674 belongs to a family of complete 12-bit ADCs implemented using BiMOS II process technology. It combines high-performance bipolar analog circuitry with digital CMOS logic. The device is pin-compatible with industry standards like the AD574A but offers faster conversion rates due to the integrated sampling function.

Replacement Considerations

Direct pin-compatible replacements include the AD574A and AD674A, though these lack the onboard SHA. For upgraded performance within the same family, consider the AD1678 (16-bit) or AD1679 (14-bit), noting differences in resolution and pinout.