LTC1272-3ACSW#PBF

Analog To Digital Converters (ADC) Overview

The LTC1272-3ACSW#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 typical power consumption of 75mW. It utilizes LTBiCMOS switched-capacitor technology for high-speed performance. The component is housed in a 24-lead Plastic SO Wide (SOL) package and supports both crystal and external clock inputs.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with 3µs conversion time and 250kHz maximum sample rate
• Single 5V supply operation with no negative supply required
• 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)
• Multiplexed data acquisition systems
• Single supply systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific speed grade suffix '-3' indicates the 3µs conversion time variant. Confirm the '#PBF' suffix denotes lead-free finish and RoHS compliance. Ensure the 'CSW' package designation matches the required 24-lead Plastic SO Wide footprint for PCB layout compatibility.

Analog To Digital Converters (ADC) Selection Notes

Select this model when a 12-bit ADC with 3µs conversion speed is required. The -3 suffix specifies the faster 250kHz sample rate capability compared to the -8 variant. Ensure the application can accommodate the 2.42V internal reference output voltage rather than the negative reference used by legacy AD7572 designs.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC1272 family of 12-bit sampling ADCs. It serves as a modernized, single-supply alternative to the industry-standard AD7572. The device integrates functions that previously required external components, such as the sample-and-hold amplifier and voltage reference, into a single monolithic IC.

Analog To Digital Converters (ADC) Replacement Considerations

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