LTC1278-5ISW#PBF

Analog To Digital Converters (ADC) Overview

The LTC1278-5ISW#PBF is a 12-bit, 500ksps successive approximation register (SAR) analog-to-digital converter in a 24-lead SOIC-W package. It operates from a single +5V supply or ±5V supplies, consuming 75mW at full speed and 8.5mW in shutdown mode. Key electrical specifications include ±1LSB INL/DNL, 70dB S/(N+D), and a 2.42V internal reference. The device features an internally synchronized clock, high-impedance analog input, and a flexible parallel interface with BUSY and CONVST signals for DSP integration.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with 500ksps sampling rate and no missing codes over temperature
• Internal 2.42V reference with external overdrive capability
• Internally trimmed clock synchronizes to sample commands
• Power-down mode reduces consumption to 8.5mW with instant wake-up

Analog To Digital Converters (ADC) Applications

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

Analog To Digital Converters (ADC) Procurement Notes

Verify the -I suffix indicates industrial temperature range (-40°C to +85°C). Confirm the SW package corresponds to the 24-lead plastic SOIC Wide form factor. Ensure compatibility with 5V logic levels for digital interfaces.

Analog To Digital Converters (ADC) Selection Notes

Select this part for applications requiring 12-bit accuracy at 500ksps. The -5 grade specifies 500ksps throughput; the -4 grade offers 400ksps. Use unipolar mode for 0V to 5V inputs or bipolar mode for ±2.5V inputs. Consider external reference if higher stability than the internal 2.42V bandgap is required.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC1278 family of 12-bit SAR ADCs. The -5 designation denotes the 500ksps speed grade, while -I indicates industrial temperature rating. It shares architecture with the LTC1276 and LTC1274 but offers higher throughput and integrated clocking.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitutes are not identified in the provided documentation. Verify pinout and timing compatibility when considering alternative SAR ADCs from other manufacturers.

Analog To Digital Converters (ADC) FAQ

What is the maximum input voltage range?

The analog input range is 0V to 5V for unipolar operation and ±2.5V for bipolar operation.

How does the internal clock function?

The internal clock is factory trimmed for 1.6μs conversion time and automatically synchronizes to each sample command, eliminating asynchronous clock noise issues.

What is the power consumption in shutdown mode?

In shutdown mode (SHDN pin low), power dissipation drops to 8.5mW typical, with instant wake-up capability.