LTC1272-8CCN

Analog To Digital Converters (ADC) Overview

The LTC1272-8CCN 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 8µs, supporting up to 111kHz sample rates. The device includes a precision 2.42V internal reference and offers 24-pin PDIP packaging. It provides parallel digital output compatible with both 8-bit and 16-bit microprocessor buses.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with 8µs conversion time
• Single 5V supply operation without negative voltage requirement
• On-chip 2.42V bandgap reference with 25ppm/°C temperature coefficient
• Compatible with AD7572 pinout for direct socket replacement

Analog To Digital Converters (ADC) Applications

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

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific speed grade suffix '8' corresponds to the 8µs conversion time specification. Confirm the 'CC' suffix indicates the commercial temperature range (0°C to 70°C). Ensure lead-free finish compliance matches project requirements, as standard parts are RoHS compliant.

Analog To Digital Converters (ADC) Selection Notes

Select this model when an 8µs conversion cycle is sufficient for the application, offering lower power consumption compared to the faster 3µs variant. Ensure the driving amplifier can settle within the 1µs acquisition window between conversions. Verify that the 0V to 5V unipolar input range aligns with the sensor signal levels.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC1272 family of 12-bit ADCs from Linear Technology (now Analog Devices). It serves as a drop-in replacement for the industry-standard AD7572, differing primarily in its single-supply architecture and improved conversion speed options. The part integrates switched-capacitor technology for high-speed sampling.

Analog To Digital Converters (ADC) Replacement Considerations

When replacing an AD7572, reverse the polarity of the external reference bypass capacitor connected to Pin 2. Short the 10Ω series resistor typically found in AD7572 circuits. Allow a minimum 1µs delay between conversions to ensure proper sample-and-hold acquisition.