LTC2341-18

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Dual, 18-Bit, 666ksps/ch Differential SoftSpan ADC with Wide Input Common Mode Range

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Overview

  • 666ksps per Channel Throughput
  • Two Simultaneous Sampling Channels
  • ±4LSB INL (Maximum)
  • Guaranteed 18-Bit, No Missing Codes
  • Differential, Wide Common Mode Range Inputs
  • Per-Channel SoftSpan Input Ranges:
    • ±4.096V, 0V to 4.096V, ±2.048V, 0V to 2.048V
    • ±5V, 0V to 5V, ±2.5V, 0V to 2.5V
  • 95dB Single-Conversion SNR (Typical)
  • −114dB THD (Typical) at fIN = 2kHz
  • 105dB CMRR (Typical) at fIN = 200Hz
  • Rail-to-Rail Input Overdrive Tolerance
  • Guaranteed Operation to 125°C
  • Integrated Reference and Buffer (4.096V)
  • SPI CMOS (1.8V to 5V) and LVDS Serial I/O
  • Internal Conversion Clock, No Cycle Latency
  • 74mW Power Dissipation (Typical)
  • 32-Lead (5mm × 5mm) QFN Package

The LTC2341-18 is an 18-bit, low noise 2-channel simultaneous sampling successive approximation register (SAR) ADC with differential, wide common mode range inputs. Operating from a 5V supply and using the internal reference and buffer, both channels of this SoftSpan™ ADC can be independently configured on a conversion-by-conversion basis to accept ±4.096V, 0V to 4.096V, ±2.048V, or 0V to 2.048V signals. One channel may also be disabled to increase throughput on the other channel.

The wide input common mode range and 105dB CMRR of the LTC2341-18 analog inputs allow the ADC to directly digitize a variety of signals, simplifying signal chain design. This input signal flexibility, combined with ±4LSB INL, no missing codes at 18 bits, and 95dB SNR, makes the LTC2341-18 an ideal choice for many applications requiring wide dynamic range.

The LTC2341-18 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces. Either one or two lanes of data output may be employed in CMOS mode, allowing the user to optimize bus width and throughput.

Applications

  • Programmable Logic Controllers
  • Industrial Process Control
  • Medical Imaging
  • High Speed Data Acquisition
LTC2341-18
Dual, 18-Bit, 666ksps/ch Differential SoftSpan ADC with Wide Input Common Mode Range
Integral Nonlinearity vs Output code and channel Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Software Resources

Evaluation Software 1

LinearLab Tools

A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards.

Evaluation Kits

eval board
schematic 1
DC2581A-A

LTC2341-18 Demo Board | Dual, 18-Bit, 666ksps Differential ±5V Input SoftSpan ADC with Wide Input Common Mode Range (Requires DC590, DC2026, DC890)

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Product Details

Demonstration circuit 2581A shows the proper way to drive the LTC2341 ADC. The LTC2341 is a low noise, high speed, simultaneous sampling 16-/18-bit successive approximation register (SAR) ADC. The LTC2341 has a flexible SoftSpan™ interface that allows conversion-by-conversion control of the input voltage span on a per-channel basis. An internal 2.048V reference and 2× buffer simplify basic operation while an external reference can be used to increase the input range and the SNR of the ADC.
DC2581A-A
LTC2341-18 Demo Board | Dual, 18-Bit, 666ksps Differential ±5V Input SoftSpan ADC with Wide Input Common Mode Range (Requires DC590, DC2026, DC890)
DC2581A - Schematic

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