LTC1278-4ISW#TRPBF

Analog To Digital Converters (ADC) Overview

The LTC1278-4ISW#TRPBF is a 12-bit, 400ksps sampling analog-to-digital converter (ADC) in a 24-lead SOIC-W package. It operates from single 5V or ±5V supplies with typical power dissipation of 75mW at full speed and 8.5mW in shutdown mode. Key specifications include ±1LSB INL/DNL, 70dB S/(N+D), and 74dB THD at Nyquist. The device features an internal synchronized clock, a 2.42V reference, and a flexible parallel interface for DSPs.

Analog To Digital Converters (ADC) Feature Summary

• 400ksps maximum sampling rate with 1.6μs conversion time
• Internal synchronized clock eliminates external clock noise issues
• Power-down mode reduces consumption to 8.5mW with instant wake-up
• ±1LSB Integral and Differential Nonlinearity without missing codes

Analog To Digital Converters (ADC) Applications

• High-speed data acquisition systems
• Digital signal processing interfaces
• Multiplexed data acquisition
• Audio and telecom processing
• Spectrum analysis

Analog To Digital Converters (ADC) Procurement Notes

Verify the -4 suffix indicates the 400ksps speed grade rather than the 500ksps variant. Confirm the ISW designation corresponds to the industrial temperature range (-40°C to 85°C) and the SW package type. Ensure the #TRPBF suffix confirms tape-and-reel packaging and lead-free compliance.

Analog To Digital Converters (ADC) Selection Notes

Select this model over the LTC1278-5 if a 400ksps throughput is sufficient, as it offers identical accuracy and interface characteristics. Consider the bipolar input capability requiring ±5V supplies if negative voltage ranges are needed. The internal reference simplifies design but can be overridden for higher precision applications.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC1278 family of 12-bit high-speed ADCs. It shares the same architecture and pinout as the faster LTC1278-5 but is binned for a maximum sampling frequency of 400ksps. The ISW variant specifically denotes the industrial temperature range and surface-mount wide package.

Analog To Digital Converters (ADC) Replacement Considerations

Public confirmed substitute part numbers: LTC1278-5ISW#TRPBF (higher speed grade).

Analog To Digital Converters (ADC) FAQ

What is the difference between the LTC1278-4 and LTC1278-5?

The primary difference is the maximum sampling frequency; the LTC1278-4 supports up to 400ksps, while the LTC1278-5 supports up to 500ksps. Both share identical accuracy, linearity, and interface specifications.

How does the internal clock synchronization work?

The internal clock automatically synchronizes to each sample command (CONVST), eliminating asynchronous clock noise problems found in competitive devices that require external clocks.

Can the internal reference be used externally?

Yes, the 2.42V internal reference is available at Pin 2 and can drive external loads up to 1mA or be driven by an external source for improved drift performance in bipolar modes.