LTC1289BCSW#PBF

ADCs/DACs - Special Purpose Overview

The LTC1289BCSW#PBF is a 3V single-chip 12-bit data acquisition system manufactured by Analog Devices Inc. It integrates an 8-channel analog multiplexer, a sample-and-hold circuit, and a successive approximation register (SAR) ADC. The device operates on a single 3.3V supply or ±3.3V dual supplies with a minimum guaranteed voltage of 2.7V. Key electrical specifications include a maximum throughput rate of 25kHz, a conversion time of 26µs max, and a typical supply current of 1.0mA. It features software-programmable unipolar/bipolar conversions, variable data word lengths (8, 12, or 16 bits), and a power shutdown mode. The component is housed in a 20-lead SOIC Wide (SW) package.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 8-channel multiplexer supporting 4 differential or 8 single-ended input configurations.
• Software-selectable output word lengths of 8, 12, or 16 bits for flexible microprocessor interfacing.
• Direct compatibility with industry-standard full-duplex serial interfaces and MPU parallel ports.
• Built-in power shutdown capability reducing supply current to approximately 10µA when idle.

ADCs/DACs - Special Purpose Applications

• Battery-powered instrumentation systems requiring low voltage operation.
• Industrial process control loops utilizing serial communication buses.
• Data acquisition modules for remote monitoring applications.
• Portable test equipment operating from single-cell lithium batteries.

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix #PBF indicates lead-free compliance and #TRPBF indicates tape and reel packaging if applicable. Confirm the BC grade temperature range (0°C to 70°C) matches the application environment. Ensure the 20-lead SW package footprint aligns with the PCB design constraints. Cross-reference the manufacturer part number with official Analog Devices documentation to confirm current production status.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a 12-bit resolution is sufficient for the required signal accuracy. Consider the 25kHz maximum sampling rate against the Nyquist requirements of the input signals. Evaluate the need for bipolar versus unipolar input ranges based on the sensor characteristics. Verify that the microprocessor interface supports the synchronous serial protocol or can emulate it via GPIO pins.

ADCs/DACs - Special Purpose Part Context

The LTC1289 belongs to the Linear Technology (now Analog Devices) family of single-chip data acquisition systems. It is functionally similar to the LTC1290 but optimized for lower voltage operation. The 'BC' designation indicates the commercial temperature grade. The 'SW' suffix denotes the 20-lead plastic SOIC Wide package. This part serves as a complete solution for multi-channel analog-to-digital conversion without external multiplexers or reference circuits.

ADCs/DACs - Special Purpose Replacement Considerations

The LTC1289CCSW#PBF is a compatible alternative within the same package and pinout, differing primarily in the C grade which may have different gain error tolerances compared to the B grade. Check datasheet specifications for INL, DNL, and offset errors to ensure the substitute meets the precision requirements of the design.