LTC1272-5ACN#PBF

Analog To Digital Converters (ADC) Overview

The LTC1272-5ACN#PBF is a 12-bit, successive approximation sampling analog-to-digital converter (ADC) featuring a 3µs conversion time and up to 250kHz sample rates. It operates on a single 5V supply with an internal 2.42V reference and on-chip sample-and-hold. The device provides a 0V to 5V unipolar input range and offers parallel data output compatible with both 8-bit and 16-bit microprocessors via three-state outputs. It utilizes LTBiCMOS switched-capacitor technology for high-speed performance.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with 3µs conversion time and 250kHz maximum sampling rate
• Single 5V supply operation with integrated 2.42V precision reference
• On-chip sample-and-hold circuit with 0V to 5V unipolar input range
• Parallel digital interface supporting 8-bit or 16-bit processor connections

Analog To Digital Converters (ADC) Applications

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

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific speed grade suffix (-3 for 3µs/250kHz or -8 for 8µs/111kHz) as the base model number does not specify it. Confirm the package type matches the required PCB footprint, typically 24-lead PDIP or SOIC. Ensure the ordering suffix includes #PBF for lead-free compliance if required by assembly specifications.

Analog To Digital Converters (ADC) Selection Notes

Select the -3 variant for applications requiring 250kHz throughput and 3µs conversion times. Choose the -8 variant for lower power or slower system requirements. Ensure the driving amplifier can settle within the 1µs minimum inter-conversion delay. Verify that the system ground layout separates analog and digital returns to maintain linearity specifications.

Analog To Digital Converters (ADC) Part Context

The LTC1272 is pin-compatible with the industry-standard AD7572 but operates on a single 5V supply instead of dual supplies. It replaces the AD7572's negative reference requirement with an internal positive 2.42V reference. This allows direct substitution in existing designs with reversed reference capacitor polarity and adjusted timing constraints.

Analog To Digital Converters (ADC) Replacement Considerations

Direct pin-for-pin replacement for AD7572 requires reversing the reference bypass capacitor polarity and allowing a 1µs acquisition time between conversions. Verify that the host system can accommodate the single-supply architecture and internal reference voltage level.