LTC1277CSW#TRPBF

Analog To Digital Converters (ADC) Overview

The Analog Devices LTC1277CSW#TRPBF is a 12-bit successive approximation analog-to-digital converter (ADC) housed in a 24-lead SO wide package. It operates from a single 5V or ±5V supply, consuming 10mW at a 100ksps sampling rate. The device features a differential input architecture and provides a two-byte read data format. Key electrical parameters include a typical signal-to-noise plus distortion ratio of 72dB at 100kHz input, total harmonic distortion of -82dB, and an internal 2.42V reference. Power management includes a Nap mode drawing 180µA and a Sleep mode reducing current to 1µA.

Analog To Digital Converters (ADC) Feature Summary

• Differential input configuration with 2-byte parallel data output format
• Ultra-low power consumption: 10mW active, 1µA in Sleep mode, 180µA in Nap mode
• Internal precision 2.42V reference with overdrive capability for input span adjustment
• High dynamic performance: 72dB S/(N+D) and -82dB THD at 100kHz input frequency

Analog To Digital Converters (ADC) Applications

• Battery-powered portable systems requiring low power operation
• Multiplexed data acquisition systems
• Audio and telecom processing applications
• Spectrum analysis equipment

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing. Confirm the CS variant meets commercial temperature requirements (0°C to 70°C). Ensure the logic supply voltage (VLOGIC) matches the host processor interface levels, as the LTC1277 supports both 3V and 5V logic interfaces via this pin.

Analog To Digital Converters (ADC) Selection Notes

Select the LTC1277 over the LTC1274 if a differential input is required for noise rejection. The LTC1277 offers distinct Nap and Sleep modes for flexible power management during inactive periods. Verify that the 2-byte read format aligns with the microprocessor's data bus access timing. Ensure the application can accommodate the 2µs acquisition time requirement for accurate signal settling.

Analog To Digital Converters (ADC) Part Context

The LTC1277 is part of the LTC1274/LTC1277 family of 12-bit, 10mW ADCs. While the LTC1274 utilizes a single-ended input and 12-bit parallel format, the LTC1277 distinguishes itself with a differential input structure and a two-byte readout mechanism. Both devices share identical power dissipation characteristics and sampling rates but differ in input topology and data interface.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.

Analog To Digital Converters (ADC) FAQ

How does the LTC1277 handle bipolar input signals?

In bipolar mode, the LTC1277 accepts ±2.048V inputs and formats the digital output as offset binary.

What is the function of the VLOGIC pin on the LTC1277?

The VLOGIC pin allows the user to select between a 3V or 5V logic interface, determining the voltage swing for all digital outputs including data bits, BUSY, and REFRDY.

Can the internal reference be modified?

Yes, the internal 2.42V reference can be overdriven positively by an external voltage source to adjust the input span range.