LTC2140CUP-14

Analog To Digital Converters (ADC) Overview

The LTC2140CUP-14#PBF is a dual-channel, 14-bit simultaneous sampling analog-to-digital converter (ADC) operating at a maximum sampling rate of 25Msps. It features a 750MHz full-power bandwidth sample-and-hold circuit and ultralow jitter of 0.08ps RMS. The device operates on a single 1.8V supply with total power dissipation of 50mW (25mW per channel). Key AC performance metrics include a typical Signal-to-Noise Ratio (SNR) of 73.7dBFS and Spurious Free Dynamic Range (SFDR) of 90dBFS. It supports selectable input ranges from 1VP-P to 2VP-P and offers CMOS or LVDS digital output interfaces.

Analog To Digital Converters (ADC) Feature Summary

• Dual-channel simultaneous sampling with 14-bit resolution and 25Msps throughput
• Ultralow jitter (0.08ps RMS) enabling high-performance undersampling
• Low power consumption: 50mW total (25mW per channel) at 25Msps
• Flexible digital outputs including Full Rate CMOS, DDR CMOS, and DDR LVDS

Analog To Digital Converters (ADC) Applications

• Cellular base stations
• Software defined radios
• Portable medical imaging
• Multi-channel data acquisition systems

Analog To Digital Converters (ADC) Procurement Notes

Verify the ordering suffix #PBF indicates lead-free finish and tube packaging. Confirm the 'C' grade designation corresponds to the commercial temperature range of 0°C to 70°C. Ensure the specific package variant matches the QFN-64 footprint requirements for the design.

Analog To Digital Converters (ADC) Selection Notes

Select this model over the LTC2141-14 or LTC2142-14 variants if the application requires a lower sampling rate of 25Msps to minimize power consumption. Verify that the 25Msps speed meets the Nyquist requirements for the target signal bandwidth. Consider the DDR LVDS option if long trace lengths or high-speed interface integrity are critical constraints.

Analog To Digital Converters (ADC) Part Context

This component belongs to the LTC214x-14 family of low-power dual ADCs. It shares the same 64-pin QFN package and core architecture as the higher-speed LTC2141-14 (40Msps) and LTC2142-14 (65Msps). The primary distinction is the reduced sampling frequency, which optimizes the device for applications prioritizing ultra-low power usage over maximum throughput.

Analog To Digital Converters (ADC) Replacement Considerations

LTC2141CUP-14#PBF (40Msps), LTC2142CUP-14#PBF (65Msps)

Analog To Digital Converters (ADC) FAQ

What is the maximum sampling frequency for the LTC2140-14?

The maximum sampling frequency is 25Msps.

How does the SENSE pin affect the input range?

Connecting the SENSE pin to VDD selects the internal reference and a ±1V input range. Connecting it to ground selects an external reference mode.

What is the typical SNR at a 70MHz input frequency?

The typical SNR is 73.7dBFS at a 70MHz input frequency with a 25Msps sampling rate.