ADS1286U

Overview

The ADS1286U is a 12-bit, 20kHz sampling analog-to-digital converter (ADC) manufactured by Texas Instruments. It features a differential input with an integrated sample and hold amplifier and consumes only 250 μA of supply current. The device utilizes a SAR architecture and communicates via an SPI/SSI compatible serial interface. It operates on a single +4.5V to +5.25V power supply and is specified for temperatures from -40°C to +85°C. Available in an 8-lead SOIC package, it offers guaranteed no missing codes and low power consumption suitable for battery-operated systems.

Feature Summary

• 12-bit resolution with 20kHz maximum sampling rate
• Low quiescent current of 250 μA at typical operating conditions
• Differential input with integrated sample and hold amplifier
• SPI and SSI compatible 3-wire serial interface

Applications

• Remote data acquisition systems
• Isolated data acquisition applications
• Transducer interfaces
• Battery operated systems

Procurement Notes

Verify the specific grade suffix when ordering. The 'U' suffix indicates an 8-lead SOIC package. Additional letters following 'U' denote temperature ranges and linearity grades: 'A', 'B', or 'C' indicate the industrial temperature range (-40°C to +85°C), while 'K', 'L', or 'M' indicate the commercial range (0°C to +70°C). Ensure the required linearity specification matches the intended application before procurement.

Selection Notes

Select the ADS1286UA, UB, or UC variant for operation in environments ranging from -40°C to +85°C. Choose based on integral linearity requirements: 'A' and 'B' offer ±2 LSB max INL, while 'C' provides tighter ±1 LSB max INL. For commercial temperature applications (0°C to +70°C), consider the ADS1286UK, UL, or UM variants. Verify that the external reference voltage supports the desired input span and noise performance.

Part Context

The ADS1286U belongs to the ADS1286 family of micro-power sampling ADCs originally developed by Burr-Brown Corporation and later acquired by Texas Instruments. This family includes PDIP and SOIC package options with varying temperature and linearity grades. The component is designed for high-efficiency data conversion in portable and remote sensing applications where power conservation is critical.

Replacement Considerations

Direct pin-compatible replacements within the same package and electrical specifications include other grades of the ADS1286 family such as ADS1286UA, ADS1286UB, ADS1286UC, ADS1286UK, ADS1286UL, and ADS1286UM. Ensure the replacement part meets the specific temperature range and linearity accuracy requirements of the original design.