LTC2345-18

PRODUCTION

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

Part Models: 6
1ku List Price: Starting From $23.07

Viewing:

Overview

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 f_IN = 2kHz
102dB CMRR (Typical) at f_IN = 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

The LTC2345-18 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.

Applications

Programmable Logic Controllers
Industrial Process Control
Medical Imaging
High Speed Data Acquisition

Part Models: 6
1ku List Price: Starting From $23.07

Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC2345CUK-18#PBF	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2345CUK-18#TRPBF	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2345HUK-18#PBF	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2345HUK-18#TRPBF	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2345IUK-18#PBF	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC2345IUK-18#TRPBF	48-Lead QFN (7mm x 7mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

Evaluation Software 2

LinearLab Tools

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

LinearLab Tools

Can't find the software or driver you need?

Hardware Ecosystem

Parts	Product Life Cycle	Description
Analog to Digital Converters (ADCs) 1
LTC2348-18	PRODUCTION	Octal, 18-Bit, 200ksps Differential ±10.24V Input SoftSpan ADC with Wide Input Common Mode Range
Interface Transceivers & Isolators 1
LTM2893	PRODUCTION	100MHz Isolated ADC Serial Interface
Operational Amplifiers (Op Amps) 2
LTC6252	LAST TIME BUY	720MHz, 3.5mA Power Efficient Rail-to-Rail I/O Op Amps
LT6237	RECOMMENDED FOR NEW DESIGNS	Dual Rail-to-Rail Output 215MHz, 1.1nV/√Hz Op Amp/SAR ADC Driver

Voltage References 1
LTC6655	PRODUCTION	0.25ppm Noise, Low Drift Precision References

Evaluation Kits

LTC2345-18 Demo Board | Octal, 18-Bit, 200ksps Simultaneous Sampling SAR ADC (Requires DC590, DC2026 or DC890)

Buy Now View Details

Product Details

Demonstration circuit 2326A shows the proper way to drive the LTC2345 ADC. The LTC2345 is a low noise, high speed, simultaneous sampling 16-/18-bit successive approximation register (SAR) ADC. The LTC2345 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.