MAX197ACNI+

ADCs/DACs - Special Purpose Overview

The MAX197ACNI+ is a multi-range, 12-bit data-acquisition system (DAS) from Analog Devices/Maxim Integrated. It operates on a single +5V supply while accepting analog input signals spanning above the rail and below ground. The device features eight independently programmable analog input channels with software-selectable ranges: ±10V, ±5V, 0V to +10V, or 0V to +5V. This configuration increases effective dynamic range to 14 bits. Key electrical specifications include a 100ksps throughput rate, 6µs conversion time, and overvoltage tolerance of ±16.5V on all input channels. The unit utilizes an 8+4 parallel bus interface and includes internal or external reference options.

ADCs/DACs - Special Purpose Feature Summary

• 12-Bit Resolution with 1/2 LSB Integral Nonlinearity
• Single +5V Supply Operation with Extended Input Range
• Software-Selectable Input Ranges: ±10V, ±5V, 0V to 10V, 0V to 5V
• Fault-Protected Input Multiplexer Tolerant to ±16.5V

ADCs/DACs - Special Purpose Applications

• Industrial-Control Systems
• Data-Acquisition Systems
• Automatic Testing Systems
• Medical Instruments

ADCs/DACs - Special Purpose Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status for the specific batch. Check for obsolescence notices as this series has faced discontinuation events in related packages. Ensure the package matches the 28-pin Narrow Plastic DIP specification.

ADCs/DACs - Special Purpose Selection Notes

Select the MAX197ACNI+ when a 12-bit resolution with high input voltage flexibility is required. The 'A' grade specifies tighter linearity performance compared to the 'B' grade. The 'C' suffix indicates a commercial temperature range of 0°C to +70°C. The 'NI' suffix denotes the 28-pin Narrow Plastic DIP package. Verify that the application requires a parallel interface rather than serial alternatives like the MAX196 or MAX198.

ADCs/DACs - Special Purpose Part Context

The MAX197 belongs to the Maxim Integrated DAS family designed for microprocessor-based systems. It integrates a successive approximation register (SAR) ADC, multiplexer, and track/hold circuitry. The ACNI variant specifically refers to the commercial temperature grade housed in a 28-pin narrow plastic dual in-line package. It serves as a bridge between high-voltage sensors and low-voltage digital logic.

ADCs/DACs - Special Purpose Replacement Considerations

For different input ranges such as ±4V or ±2V, consult the MAX199 datasheet. For 12-bit devices with different bus interfaces, refer to the MAX196 or MAX198. Note that the MAX197AENI+ is a lead-free version in a wide DIP package, but verify pin compatibility and thermal characteristics before substitution.