ADC12441CIJ

ADCs/DACs - Special Purpose Overview

The ADC12441CIJ is a CMOS 12-bit plus sign successive approximation analog-to-digital converter featuring an internal sample-and-hold and self-calibration capabilities. It operates with ±5V supplies, supporting both unipolar (0V to +5V) and bipolar (±5V) input ranges using a single reference. The device provides a 13-bit two's complement output compatible with TTL or CMOS logic. Key electrical parameters include a maximum conversion time of 13.8 ms at a 2.0 MHz clock, a minimum bipolar signal-to-noise ratio of 76.5 dB, and a maximum power consumption of 70 mW. It is housed in a 28-lead CDIP package.

ADCs/DACs - Special Purpose Feature Summary

• Self-calibration cycle adjusts positive linearity and full-scale errors to less than ±½ LSB each, with zero error corrected to less than ±1 LSB.
• Internal sample-and-hold circuitry eliminates the need for external holding components.
• Auto-Zero cycle corrects comparator offset voltage during every conversion to maintain accuracy across temperature variations.
• TRI-STATE digital outputs ensure compatibility with standard microprocessor buses.

ADCs/DACs - Special Purpose Applications

• Digital signal processing systems
• Telecommunications equipment
• High-resolution process control instrumentation
• Audio analysis and measurement devices

ADCs/DACs - Special Purpose Procurement Notes

Verify component authenticity as the ADC12441CIJ is marked obsolete by the manufacturer. Confirm that the specific lot meets military/aerospace RETS specifications if required, as standard commercial versions may differ in testing rigor. Ensure supply chain sources provide valid datasheet revisions (SNAS068A) to guarantee pinout and timing parameter accuracy.

ADCs/DACs - Special Purpose Selection Notes

Select this component when high linearity and low offset drift are critical without requiring external calibration hardware. It is suitable for applications needing ±5V bipolar inputs with a single reference source. Designers must account for the 1396-clock calibration period on power-up and the additional 26-clock Auto-Zero overhead if enabled. Ensure the analog input source impedance remains below 1kΩ to meet acquisition time requirements at 2.0 MHz clock speeds.

ADCs/DACs - Special Purpose Part Context

The ADC12441 belongs to the National Semiconductor ADC124x family of precision data converters. The CIJ suffix denotes the industrial temperature range (-40°C to +85°C) and the 28-lead ceramic dual-in-line package. This part represents a legacy solution for high-accuracy DC and low-frequency AC measurements before the widespread adoption of modern sigma-delta architectures.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. As the device is obsolete, designers should evaluate modern successive approximation register (SAR) ADCs with integrated calibration features from current manufacturers, ensuring pin compatibility or designing adapter circuits for package differences.