Datasheet LTC2344-18 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Quad, 18-Bit, 400ksps/ch Differential SoftSpan ADC with Wide Input Common Mode Range |
| Pages / Page | 40 / 1 — FEATURES. DESCRIPTION. 400ksps per Channel Throughput. Four Simultaneous … |
| File Format / Size | PDF / 2.3 Mb |
| Document Language | English |
FEATURES. DESCRIPTION. 400ksps per Channel Throughput. Four Simultaneous Sampling Channels. ±4LSB INL (Maximum, ±4.096V Range)
Model Line for this Datasheet
Text Version of Document
LTC2344-18 Quad, 18-Bit, 400ksps/ch Differential SoftSpan ADC with Wide Input Common Mode Range
FEATURES DESCRIPTION
n
400ksps per Channel Throughput
The LTC®2344-18 is an 18-bit, low noise 4-channel simul- n
Four Simultaneous Sampling Channels
taneous sampling successive approximation register (SAR) n
±4LSB INL (Maximum, ±4.096V Range)
ADC with differential, wide common mode range inputs. n
Guaranteed 18-Bit, No Missing Codes
Operating from a 5V supply and using the internal reference n
Differential, Wide Common Mode Range Inputs
and buffer, each channel of this SoftSpanTM ADC can be n
Per-Channel SoftSpan Input Ranges:
independently configured on a conversion-by-conversion
±4.096V, 0V to 4.096V, ±2.048V, 0V to 2.048V
basis to accept ±4.096V, 0V to 4.096V, ±2.048V, or 0V to
±5V, 0V to 5V, ±2.5V, 0V to 2.5V
2.048V signals. Individual channels may also be disabled n to increase throughput on the remaining channels.
95dB Single-Conversion SNR (Typical)
n
−114dB THD (Typical) at fIN = 2kHz
The wide input common mode range and 102dB CMRR of n
102dB CMRR (Typical) at fIN = 200Hz
the LTC2344-18 analog inputs allow the ADC to directly n
Rail-to-Rail Input Overdrive Tolerance
digitize a variety of signals, simplifying signal chain de- n Guaranteed Operation to 125°C sign. This input signal flexibility, combined with ±4LSB n Integrated Reference and Buffer (4.096V) INL, no missing codes at 18 bits, and 95dB SNR, makes n SPI CMOS (1.8V to 5V) and LVDS Serial I/O the LTC2344-18 an ideal choice for many applications n Internal Conversion Clock, No Cycle Latency requiring wide dynamic range. n 81mW Power Dissipation (Typical) The LTC2344-18 supports pin-selectable SPI CMOS (1.8V n 32-Lead (5mm × 5mm) QFN Package to 5V) and LVDS serial interfaces. Between one and four lanes of data output may be employed in CMOS mode,
APPLICATIONS
allowing the user to optimize bus width and throughput. L n , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Programmable Logic Controllers SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property n of their respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673, Industrial Process Control 9197235. n Medical Imaging n High Speed Data Acquisition
TYPICAL APPLICATION
5V 1.8V TO 5V
Integral Nonlinearity vs
0.1µF 2.2µF 0.1µF
Output Code and Channel
CMOS OR LVDS 2.0 I/O INTERFACE ±4.096V RANGE FULLY VDD VDDLBYP OVDD LVDS/CMOS 1.5 FULLY DIFFERENTIAL DRIVE (IN– = –IN+) ARBITRARY DIFFERENTIAL IN0+ S/H PD ALL CHANNELS 5V 5V IN0– 1.0 LTC2344-18 0.5 SDO0 • • • 0V 0V S/H • • • 0 18-BIT MUX SDO3 BIPOLAR UNIPOLAR SAR ADC –0.5 SCKO 5V INL ERROR (LSB) 5V S/H SCKI SDI –1.0 CS BUSY –1.5 0V 0V SAMPLE IN3+ S/H CNV CLOCK IN3– –2.0 DIFFERENTIAL INPUTS IN+/IN– WITH REFBUF REFIN GND –131072 –65536 0 65536 131072 WIDE INPUT COMMON MODE RANGE 234418 TA01a OUTPUT CODE 47µF 0.1µF 234418 TA01b FOUR SIMULTANEOUS SAMPLING CHANNELS 234418f For more information www.linear.com/LTC2344-18 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Converter Characteristics Dynamic Accuracy Internal Reference Characteristics Reference Buffer Characteristics Digital Inputs and Digital Outputs Power Requirements ADC Timing Characteristics Typical Performance Characteristics Pin Functions Configuration Tables Functional Block Diagram Timing Diagram Applications Information Board Layout Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n
400ksps per Channel Throughput
The LTC®2344-18 is an 18-bit, low noise 4-channel simul- n
Four Simultaneous Sampling Channels
taneous sampling successive approximation register (SAR) n
±4LSB INL (Maximum, ±4.096V Range)
ADC with differential, wide common mode range inputs. n
Guaranteed 18-Bit, No Missing Codes
Operating from a 5V supply and using the internal reference n
Differential, Wide Common Mode Range Inputs
and buffer, each channel of this SoftSpanTM ADC can be n
Per-Channel SoftSpan Input Ranges:
independently configured on a conversion-by-conversion
±4.096V, 0V to 4.096V, ±2.048V, 0V to 2.048V
basis to accept ±4.096V, 0V to 4.096V, ±2.048V, or 0V to
±5V, 0V to 5V, ±2.5V, 0V to 2.5V
2.048V signals. Individual channels may also be disabled n to increase throughput on the remaining channels.
95dB Single-Conversion SNR (Typical)
n
−114dB THD (Typical) at fIN = 2kHz
The wide input common mode range and 102dB CMRR of n
102dB CMRR (Typical) at fIN = 200Hz
the LTC2344-18 analog inputs allow the ADC to directly n
Rail-to-Rail Input Overdrive Tolerance
digitize a variety of signals, simplifying signal chain de- n Guaranteed Operation to 125°C sign. This input signal flexibility, combined with ±4LSB n Integrated Reference and Buffer (4.096V) INL, no missing codes at 18 bits, and 95dB SNR, makes n SPI CMOS (1.8V to 5V) and LVDS Serial I/O the LTC2344-18 an ideal choice for many applications n Internal Conversion Clock, No Cycle Latency requiring wide dynamic range. n 81mW Power Dissipation (Typical) The LTC2344-18 supports pin-selectable SPI CMOS (1.8V n 32-Lead (5mm × 5mm) QFN Package to 5V) and LVDS serial interfaces. Between one and four lanes of data output may be employed in CMOS mode,
APPLICATIONS
allowing the user to optimize bus width and throughput. L n , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Programmable Logic Controllers SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property n of their respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673, Industrial Process Control 9197235. n Medical Imaging n High Speed Data Acquisition
TYPICAL APPLICATION
5V 1.8V TO 5V
Integral Nonlinearity vs
0.1µF 2.2µF 0.1µF
Output Code and Channel
CMOS OR LVDS 2.0 I/O INTERFACE ±4.096V RANGE FULLY VDD VDDLBYP OVDD LVDS/CMOS 1.5 FULLY DIFFERENTIAL DRIVE (IN– = –IN+) ARBITRARY DIFFERENTIAL IN0+ S/H PD ALL CHANNELS 5V 5V IN0– 1.0 LTC2344-18 0.5 SDO0 • • • 0V 0V S/H • • • 0 18-BIT MUX SDO3 BIPOLAR UNIPOLAR SAR ADC –0.5 SCKO 5V INL ERROR (LSB) 5V S/H SCKI SDI –1.0 CS BUSY –1.5 0V 0V SAMPLE IN3+ S/H CNV CLOCK IN3– –2.0 DIFFERENTIAL INPUTS IN+/IN– WITH REFBUF REFIN GND –131072 –65536 0 65536 131072 WIDE INPUT COMMON MODE RANGE 234418 TA01a OUTPUT CODE 47µF 0.1µF 234418 TA01b FOUR SIMULTANEOUS SAMPLING CHANNELS 234418f For more information www.linear.com/LTC2344-18 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Converter Characteristics Dynamic Accuracy Internal Reference Characteristics Reference Buffer Characteristics Digital Inputs and Digital Outputs Power Requirements ADC Timing Characteristics Typical Performance Characteristics Pin Functions Configuration Tables Functional Block Diagram Timing Diagram Applications Information Board Layout Package Description Typical Application Related Parts
