LTC2312ITS8-14#TRMPBF

Analog To Digital Converters (ADC) Overview

The LTC2312ITS8-14#TRMPBF is a 14-bit, 500ksps serial sampling Analog-to-Digital Converter (ADC) in an 8-lead TSOT-23 package. It operates from a single 3V or 5V analog supply (VDD) and supports 1.8V to 5V digital logic via a separate I/O supply (OVDD). The device features an integrated low-drift internal reference with a maximum temperature coefficient of 20ppm/°C, providing output spans of 2.048V at 3V operation or 4.096V at 5V operation. Key performance metrics include a Signal-to-Noise Ratio (SNR) of 77.5dB and Total Harmonic Distortion (THD) of –85dB at 500ksps throughput. Power consumption is 15mW at 5V/500ksps, dropping to <1µA in sleep mode.

Analog To Digital Converters (ADC) Feature Summary

• 14-bit resolution with guaranteed no missing codes and 500ksps throughput rate.
• Integrated low drift reference (20ppm/°C max) offering 2.048V or 4.096V spans.
• Single 3V or 5V analog supply with separate 1.71V–5.25V digital I/O supply (OVDD).
• SPI-compatible serial interface with no cycle latency and nap/sleep power modes.

Analog To Digital Converters (ADC) Applications

• High speed data acquisition systems.
• Communication systems requiring fast serial interfaces.
• Medical imaging equipment.
• Battery operated and handheld terminal interfaces.
• Automotive applications operating within the industrial temperature range.

Analog To Digital Converters (ADC) Procurement Notes

Verify the specific suffix 'ITS8' confirms the –40°C to 85°C industrial temperature grade and the '#TRMPBF' designation indicates lead-free finish in mini tape-and-reel packaging containing 500 pieces. Confirm OVDD requirements for host logic compatibility before integration.

Analog To Digital Converters (ADC) Selection Notes

Select this component when 14-bit accuracy and 500ksps speed are required in a compact TSOT-23 footprint. Ensure the driving source impedance allows settling within the 700ns minimum acquisition time (tACQ-MIN). Use the nap mode for lower average power at reduced sample rates, but account for the 1.1ms wake-up time if utilizing sleep mode.

Analog To Digital Converters (ADC) Part Context

This part belongs to the LTC2312-14 family of 14-bit SAR ADCs. It is pin-compatible with other variants in the series such as the LTC2313-14 (2.5Msps) and LTC2314-14 (4.5Msps), allowing for design scalability without PCB layout changes.

Analog To Digital Converters (ADC) Replacement Considerations

Direct pin-compatible replacements within the same package include the LTC2313-14ITS8-14#TRMPBF (2.5Msps) and LTC2314-14ITS8-14#TRMPBF (4.5Msps). Lower speed options like the LTC2312-12ITS8-12#TRMPBF (12-bit) are also compatible but offer reduced resolution.

Analog To Digital Converters (ADC) FAQ

How does the internal reference voltage change based on the supply voltage?

The internal reference buffer automatically configures the REF pin output to 2.048V when VDD is in the 2.7V to 3.6V range, and to 4.096V when VDD is in the 4.75V to 5.25V range.

What is the difference between Nap Mode and Sleep Mode?

Nap mode powers down the core after conversion but keeps the bandgap and reference active, allowing wake-up in <1 conversion cycle. Sleep mode shuts down all bias circuitry including the reference, reducing current to ~0.2µA but requiring a 1.1ms wait time for the reference capacitor to recharge before accurate conversion.

Can the REF pin be used for an external reference?

Yes, the REF pin can be overdriven with an external reference voltage that is at least 50mV higher than the internal reference voltage output, provided it falls within the specified input voltage range for the respective VDD.