LTC2345-18 - Octal, 18-Bit, 200ksps Differential SoftSpan ADC with Wide Input Common Mode Range

The LTC®2345-18 is an 18-bit, low noise 8-channel simultaneous sampling successive approximation register (SAR) ADC with differential, wide common mode range inputs. Operating from a 5V low voltage supply and using the internal reference and buffer, each channel of this SoftSpanTM ADC can be independently configured on a conversion-by-conversion basis to accept ±4.096, 0V to 4.096V, ±2.048V, or 0V to 2.048V signals. Individual channels may also be disabled to increase throughput on the remaining channels.

The wide input common mode range and 102dB CMRR of the LTC2345-18 analog inputs allow the ADC to directly digitize a variety of signals, simplifying signal chain design. This input signal flexibility, combined with ±5LSB INL, no missing codes at 18 bits, and 91.8dB SNR, makes the LTC2345-18 an ideal choice for many applications requiring wide dynamic range.

The LTC2345-18 supports pin-selectable SPI CMOS (1.8V to 5V) and LVDS serial interfaces. Between one and eight lanes of data output may be employed in CMOS mode, allowing the user to optimize bus width and throughput.

  • 200ksps per Channel Throughput
  • Eight Simultaneous Sampling Channels
  • ±5LSB INL (Maximum, ±4.096V Range)
  • 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
  • 91.8dB Single-Conversion SNR (Typical)
  • −113dB THD (Typical) at fIN = 2kHz
  • 102dB 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
  • 81mW Power Dissipation (Typical)
  • 48-Lead (7mm x 7mm) QFN Package
Typical Application
LTC2345-18 Typical Application
LTC2345-18 Typical Application
  • Programmable Logic Controllers
  • Industrial Process Control
  • Medical Imaging
  • High Speed Data Acquisition
LTC2345-18 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC2345CUK-18#PBF7x7 QFN-48C$27.86$19.50
LTC2345CUK-18#TRPBF7x7 QFN-48C$27.96$19.60
LTC2345HUK-18#PBF7x7 QFN-48H$36.79$25.75
LTC2345HUK-18#TRPBF7x7 QFN-48H$36.89$25.85
LTC2345IUK-18#PBF7x7 QFN-48I$32.00$22.40
LTC2345IUK-18#TRPBF7x7 QFN-48I$32.10$22.50
Demo Boards
Part NumberDescriptionPrice
DC2326A-ALTC2345-18 Demo Board | Octal, 18-Bit, 200ksps Simultaneous Sampling SAR ADC (req DC590, DC2026 or DC890)$150.00
Companion Boards
Part NumberDescriptionPrice
DC2026CLinduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform$75.00
DC590BIsolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards$50.00
DC890BUSB Data Acquisition Controller, for PScope Evaluation Kits (up to 250Mbps, CMOS/LVDS)$300.00
Reliability Data
Product Selector Card
Software and Simulation
Related Products
LTC2345-18 - Octal, 18-Bit, 200ksps Differential SoftSpan ADC with Wide Input Common Mode Range
R549 - Reliability Data
Precision Signal Chain Products Selector Guide
DC2094A/DC2326A/DC2365A CPLD Source Code