LTC1278-4CN#PBF

Analog To Digital Converters (ADC) Overview

The LTC1278-4CN#PBF is a 12-bit, 400ksps sampling analog-to-digital converter (ADC) in a 24-lead PDIP package. It features an internal synchronized clock, a precision 2.42V reference, and a 200ns sample-and-hold circuit. Operating from a single +5V or ±5V supply, it draws 75mW during conversion and 8.5mW in shutdown mode with instant wake-up. The device supports unipolar (0V to 5V) and bipolar (±2.5V) input ranges. Key specifications include ±1LSB INL/DNL, 70dB S/(N+D) at 100kHz input, and a flexible parallel interface compatible with DSPs and microprocessors.

Analog To Digital Converters (ADC) Feature Summary

• 12-bit resolution with no missing codes over temperature
• Internal synchronized clock eliminates external clock noise issues
• Power-down feature reduces consumption to 8.5mW with instant wake-up
• Flexible parallel interface with separate Conversion Start (CONVST) and Data Ready (BUSY) signals

Analog To Digital Converters (ADC) Applications

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

Analog To Digital Converters (ADC) Procurement Notes

Verify the suffix 'CN' corresponds to the commercial temperature range (0°C to 70°C) and the 'N' package designation for the 24-lead PDIP form factor. Confirm that the '-4' speed grade indicates a maximum sampling frequency of 400ksps, distinct from the -5 grade's 500ksps capability. Ensure the '#PBF' suffix denotes lead-free compliance and RoHS adherence as per manufacturer standards.

Analog To Digital Converters (ADC) Selection Notes

Select the LTC1278-4 variant when a maximum throughput of 400ksps is sufficient, offering a lower cost option compared to the 500ksps LTC1278-5. Choose this component if system architecture requires an internal clock to simplify PCB layout and avoid asynchronous clock jitter. Ensure the application can accommodate the 24-pin PDIP footprint or adapt design for the SW (SOIC) alternative if space constraints exist.

Analog To Digital Converters (ADC) Part Context

The LTC1278-4CN#PBF belongs to the LTC1278 family of high-speed, low-power 12-bit ADCs. It shares architectural similarities with the LTC1274 but offers higher throughput and different interface characteristics. The '-4' designation specifically limits the maximum sampling rate to 400ksps, while the 'C' indicates commercial temperature operation. This part serves as a bridge between slower, high-resolution converters and faster, lower-resolution SAR ADCs.

Analog To Digital Converters (ADC) Replacement Considerations

Publicly confirmed substitutes are not available in the provided documentation. Designers may consider the LTC1278-5CN#PBF for higher speed requirements or the LTC1274ISW#PBF for lower power applications, though pinouts and performance metrics differ.