LTC1272-3ACSW

Analog To Digital Converters (ADC) Overview

The LTC1272-3ACSW is a 12-bit successive approximation sampling analog-to-digital converter manufactured by Analog Devices Inc. It operates on a single 5V supply and features an on-chip sample-and-hold circuit with a maximum conversion time of 3µs, supporting up to 250kHz sampling rates. The device utilizes LTbiCMOS switched-capacitor technology and includes a precision 2.42V internal reference. It provides parallel data output compatible with both 8-bit and 16-bit microprocessors via three-state outputs. The component is housed in a 24-lead plastic SO Wide (SOL) package and functions within a commercial temperature range of 0°C to 70°C.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with 3µs conversion time and 250kHz sampling rate
• Single 5V supply operation with no negative voltage required
• On-chip sample-and-hold and 2.42V precision reference
• AD7572 pinout compatibility for direct socket replacement

Analog To Digital Converters (ADC) Applications

• High-speed data acquisition systems
• Digital signal processing (DSP)
• Multiplexed data acquisition systems
• Single supply instrumentation

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific speed grade suffix '3' indicates the 3µs/250kHz performance variant rather than the '8' grade. Confirm the 'ACSW' designation corresponds to the 24-lead Plastic SO Wide package and the 0°C to 70°C commercial temperature range. Ensure lead-free finish compliance if required by the target assembly process.

Analog To Digital Converters (ADC) Selection Notes

Select this model when a 12-bit ADC requires a 3µs maximum conversion time and single-supply operation. It serves as a drop-in replacement for the AD7572 in existing designs, provided the reference capacitor polarity is reversed and a 1µs acquisition time is maintained between conversions. Choose the 'ACSW' package for surface-mount applications requiring a wide SOIC footprint.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC1272 family of 12-bit sampling A/D converters. The '-3' suffix distinguishes it from the slower LTC1272-8 variant, which has an 8µs conversion time. The 'A' grade specifies tighter linearity error limits compared to the 'C' grade. The 'CSW' suffix identifies the 24-lead Plastic SO Wide package type.

Analog To Digital Converters (ADC) Replacement Considerations

The LTC1272 is designed to be pin-compatible with the AD7572. When replacing an AD7572, reverse the polarity of the external reference bypass capacitor and allow a 1µs acquisition time between conversions. Pin 23 is not connected internally on the LTC1272.