LTC1272-3ACN#PBF

Analog To Digital Converters (ADC) Overview

The LTC1272-3ACN#PBF is a 12-bit, 3µs successive approximation sampling analog-to-digital converter (ADC) from Analog Devices. It operates on a single 5V supply and features an on-chip sample-and-hold circuit and a precision 2.42V reference. The device offers up to 250kHz sample rates with 75mW typical power consumption. 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 PDIP package and supports operation within the 0°C to 70°C temperature range.

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 bandgap reference
• On-chip sample-and-hold with 0.45µs to 1µs acquisition time
• Parallel digital interface with three-state outputs for 8-bit or 16-bit systems

Analog To Digital Converters (ADC) Applications

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

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific speed grade suffix (-3 for 3µs/250kHz) against design requirements. Confirm the PDIP-24 through-hole package matches the PCB footprint. Ensure the -ACN variant meets the required commercial temperature range of 0°C to 70°C. Check RoHS compliance status for the PBF designation.

Analog To Digital Converters (ADC) Selection Notes

Select this part for applications requiring direct replacement for the AD7572 with improved speed and single-supply capability. Note that the internal reference voltage is 2.42V, unlike the AD7572's negative reference, requiring polarity reversal of external bypass capacitors if used in legacy sockets. Ensure the driving amplifier can settle within the 1µs inter-conversion delay.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC1272 family of 12-bit ADCs. The '-3' suffix denotes the faster speed grade (3µs conversion time), while '-8' indicates a slower 8µs variant. The 'CN' indicates a plastic DIP package, and '#PBF' signifies lead-free finish. It is functionally pin-compatible with the industry-standard AD7572.

Analog To Digital Converters (ADC) Replacement Considerations

The LTC1272 serves as a drop-in replacement for the AD7572. Designers must reverse the polarity of the reference bypass capacitor when substituting into existing AD7572 circuits due to the different internal reference configuration.