LTC2344-16
FEATURES
Quad, 16-Bit, 400ksps/ch
Differential SoftSpan ADC with
Wide Input Common Mode Range
DESCRIPTION
nn 400ksps per Channel Throughput
nn Four Simultaneous Sampling Channels
nn ±1.25LSB INL (Maximum)
nn Guaranteed 16-Bit, No Missing Codes
nn Differential, Wide Common Mode Range Inputs
nn 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
nn 93.4dB Single-Conversion SNR (Typical)
nn −114dB THD (Typical) at fIN = 2kHz
nn 102dB CMRR (Typical) at fIN = 200Hz
nn Rail-to-Rail Input Overdrive Tolerance
nn Guaranteed Operation to 125°C
nn Integrated Reference and Buffer (4.096V)
nn SPI CMOS (1.8V to 5V) and LVDS Serial I/O
nn Internal Conversion Clock, No Cycle Latency
nn 81mW Power Dissipation (Typical)
nn 32-Lead (5mm × 5mm) QFN Package
APPLICATIONS
nn Programmable Logic Controllers
nn Industrial Process Control
nn Medical Imaging
nn High Speed Data Acquisition
The LTC®2344-16 is a 16-bit, low noise 4-channel simulta-
neous 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, each channel of this SoftSpanTM 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. Individual channels may also be disabled
to increase throughput on the remaining channels.
The wide input common mode range and 102dB CMRR of
the LTC2344-16 analog inputs allow the ADC to directly
digitize a variety of signals, simplifying signal chain design.
This input signal flexibility, combined with ±1.25LSB INL,
no missing codes at 16 bits, and 93.4dB SNR, makes the
LTC2344-16 an ideal choice for many applications requir-
ing wide dynamic range.
The LTC2344-16 supports pin-selectable SPI CMOS (1.8V
to 5V) and LVDS serial interfaces. Between one and four
lanes of data output may be employed in CMOS mode,
allowing the user to optimize bus width and throughput.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 7705765, 7961132, 8319673, 9197235.
TYPICAL APPLICATION
ARBITRARY
5V
FULLY
DIFFERENTIAL
5V
0V
BIPOLAR
5V
0V
UNIPOLAR
5V
0V
0V
DIFFERENTIAL INPUTS IN+/IN– WITH
WIDE INPUT COMMON MODE RANGE
IINN00+– S/H
S/H
S/H
IINN33+– S/H
FOUR SIMULTANEOUS
SAMPLING CHANNELS
5V
0.1µF
2.2µF
1.8V TO 5V
0.1µF
CMOS OR LVDS
I/O INTERFACE
VDD VDDLBYP OVDD LVDS/CMOS
PD
LTC2344-16
SDO0
MUX
16-BIT
SAR ADC
REFBUF REFIN GND
47µF
0.1µF
SDO3
SCKO
SCKI
SDI
CS
BUSY
CNV
234416 TA01a
SAMPLE
CLOCK
Document Feedback
For more information www.analog.com
Integral Nonlinearity
vs Output Code and Channel
1.00
±4.096V RANGE
0.75
FULLY DIFFERENTIAL DRIVE (IN– = –IN+)
ALL CHANNELS
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
–32768
–16384
0
16384 32768
OUTPUT CODE
234416 TA01b
Rev A
1
