ADS1286UB/2K5

Overview

The ADS1286UB/2K5 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 an SPI and SSI compatible serial interface for communication over two or three wires. Operating within a temperature range of -40°C to +85°C, it is housed in an 8-lead SOIC package. Key electrical specifications include a maximum conversion time of 12 clock cycles, a typical SINAD of 72 dB at 1 kHz, and guaranteed no missing codes.

Feature Summary

• 12-bit resolution with 20kHz sampling rate and differential input
• Micro-power operation with 250 μA supply current and automatic shutdown
• SPI and SSI compatible 3-wire serial interface
• Guaranteed no missing codes and integral linearity of ±2 LSB

Applications

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

Procurement Notes

Verify the ordering suffix /2K5 indicates a standard tube packaging quantity of 250 units per tube, distinct from the non-suffixed variant which typically comes in tubes of 100. Confirm the specific grade corresponds to the extended industrial temperature range (-40°C to +85°C). Ensure compatibility with the 8-lead SOIC footprint during PCB layout. Cross-reference the datasheet version to confirm pinout consistency with existing designs.

Selection Notes

Select this component when low power consumption and high-speed 12-bit conversion are required. The SAR architecture provides fast conversion times suitable for dynamic signals up to 20kHz. Consider the external reference voltage requirements, as the REF input range is 1.25V to VCC+0.05V. Evaluate the impact of reduced reference voltages on offset error and noise performance if lower input spans are utilized in the design.

Part Context

The ADS1286 belongs to the Burr-Brown/Texas Instruments family of micro-power ADCs. The 'UB' designation specifies the 8-lead SOIC package with the extended industrial temperature range (-40°C to +85°C). The '/2K5' suffix denotes the bulk packaging format containing 250 units per tube. This part serves as a bridge between high-resolution sigma-delta converters and faster but lower-resolution successive approximation devices.

Replacement Considerations

Public confirmed substitute part numbers: None identified in verified documentation.