LTC1272-8CCSW#TRPBF

Analog To Digital Converters (ADC) Overview

The LTC1272-8CCSW#TRPBF is a 12-bit, successive approximation sampling analog-to-digital converter (ADC) from Analog Devices. It operates on a single 5V supply and features an internal sample-and-hold circuit with a conversion time of 8µs, supporting up to 111kHz sample rates. The device includes an on-chip 2.42V precision reference and offers a 0V to 5V unipolar input range. Packaged in a 24-lead Plastic SO Wide (SOL), it provides three-state digital outputs compatible with both 8-bit and 16-bit microprocessors.

Analog To Digital Converters (ADC) Feature Summary

• 12-Bit Resolution with On-Chip Sample-and-Hold
• Single 5V Supply Operation (No Negative Supply Required)
• Internal 2.42V Reference with 25ppm/°C Temperature Coefficient
• 3µs or 8µs Conversion Times (LTC1272-8 Grade: 8µs)

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 (-8 indicates 8µs conversion time) and temperature range (CC indicates commercial 0°C to 70°C). Confirm the package type matches the required board layout for the 24-lead Plastic SO Wide format. Ensure the ordering suffix #TRPBF corresponds to the tape and reel packaging specification.

Analog To Digital Converters (ADC) Selection Notes

Select the LTC1272-8 variant when an 8µs conversion time is sufficient, offering lower power consumption compared to the 3µs version. Ensure the driving amplifier can settle within the 1µs acquisition time between conversions. Verify that the system clock frequency aligns with the 1.6MHz requirement for the -8 grade if using the internal oscillator.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC1272 family of 12-bit ADCs. It is designed as a pin-compatible replacement for the industry-standard AD7572, though it requires reversing the reference capacitor polarity due to its single-supply architecture. The 'CC' suffix denotes the commercial operating temperature range, while 'SW' identifies the 24-lead Plastic SO Wide package.

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. Note that Pin 23 is not connected internally on the LTC1272 and does not require a negative supply connection.