LTC1411CG#PBF

Analog To Digital Converters (ADC) Overview

The LTC1411CG#PBF is a single-supply, 14-bit, 2.5Msps analog-to-digital converter housed in a 36-lead plastic SSOP package. It operates from a single 5V supply with typical power dissipation of 195mW. The device integrates a high-bandwidth sample-and-hold circuit, a precision internal reference, and an internally trimmed clock. It supports differential or single-ended inputs and provides four programmable input ranges selected via digital pins. Dynamic performance includes 80dB S/(N + D) and 90dB THD at a 100kHz input frequency.

Analog To Digital Converters (ADC) Feature Summary

• 14-bit resolution with no missing codes and –2LSB integral linearity error
• 2.5Msps sampling rate with 80dB S/(N + D) and 90dB THD at 100kHz
• Four programmable input ranges (–1.8V, –1.27V, –0.9V, –0.64V) via PGA0/PGA1
• Sleep (1mA) and Nap (2mA) shutdown modes for low power operation

Analog To Digital Converters (ADC) Applications

• Telecommunications systems
• High-speed data acquisition
• Digital signal processing
• Multiplexed data acquisition systems
• Spectrum analysis
• Imaging systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the operating temperature range matches the application requirements; the 'C' suffix indicates a commercial range of 0°C to 70°C. Confirm that the 36-lead SSOP package dimensions align with the PCB footprint. Ensure the design accommodates the specific bypass capacitor values required for the REFCOM1, REFCOM2, and AVP pins to maintain specified noise and linearity performance.

Analog To Digital Converters (ADC) Selection Notes

Select this component when a single 5V supply and moderate power consumption are required. The internal 2.5V reference may be sufficient for many applications, but external references can be used via the REFIN pin for improved drift characteristics. Consider the wake-up times: 210ms from Sleep mode and 250ns from Nap mode when designing power management sequences. The device outputs data in 2's complement format.

Analog To Digital Converters (ADC) Part Context

The LTC1411 is part of Analog Devices' family of high-speed successive approximation ADCs. The LTC1411CG#PBF specifically denotes the commercial temperature grade version packaged in a 36-lead SSOP. It serves as a bridge between analog signals and digital processing units, offering a balance between resolution, speed, and power efficiency for general-purpose high-performance data conversion tasks.

Analog To Digital Converters (ADC) Replacement Considerations

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

Analog To Digital Converters (ADC) FAQ

How are the programmable input ranges configured?

The input ranges are selected using two digital logic inputs, PGA0 and PGA1. These pins control the internal DAC reference voltage (REFCOM2), providing spans of –1.8V, –1.27V, –0.9V, and –0.64V relative to the voltage applied to AIN–.

What is the difference between Sleep and Nap modes?

In Sleep mode, the ADC draws less than 1mA, but requires approximately 210ms to wake up due to the time needed for the REFCOM2 bypass capacitor to charge. In Nap mode, the ADC draws about 2mA while keeping the internal reference active, allowing for a much faster wake-up time of 250ns.

How does the Out-of-the-Range (OTR) indicator work?

The OTR pin goes high when the analog input exceeds the selected input range. By combining the OTR signal with the Most Significant Bit (D13), one can distinguish between overrange (OTR high, D13 low) and underrange (OTR high, D13 high) conditions.