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Linear Technology Electronic Components Datasheet

LTC2344IUH-18 Datasheet

400ksps/ch Differential SoftSpan ADC

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LTC2344-18
FEATURES
Quad, 18-Bit, 400ksps/ch
Differential SoftSpan ADC with
Wide Input Common Mode Range
DESCRIPTION
nn 400ksps per Channel Throughput
nn Four Simultaneous Sampling Channels
nn ±4LSB INL (Maximum, ±4.096V Range)
nn Guaranteed 18-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 95dB 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®2344-18 is an 18-bit, low noise 4-channel simul-
taneous 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 LTC2344-18 analog inputs allow the ADC to directly
digitize a variety of signals, simplifying signal chain de-
sign. This input signal flexibility, combined with ±4LSB
INL, no missing codes at 18 bits, and 95dB SNR, makes
the LTC2344-18 an ideal choice for many applications
requiring wide dynamic range.
The LTC2344-18 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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
SoftSpan is a trademark of Linear Technology Corporation. All other 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
LTC2344-18
SDO0
MUX
18-BIT
SAR ADC
REFBUF REFIN GND
47µF
0.1µF
SDO3
SCKO
SCKI
SDI
CS
BUSY
CNV
234418 TA01a
SAMPLE
CLOCK
For more information www.linear.com/LTC2344-18
Integral Nonlinearity vs
Output Code and Channel
2.0
±4.096V RANGE
1.5
FULLY DIFFERENTIAL DRIVE (IN= –IN+)
ALL CHANNELS
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–131072
–65536
0
65536 131072
OUTPUT CODE
234418 TA01b
234418f
1


Linear Technology Electronic Components Datasheet

LTC2344IUH-18 Datasheet

400ksps/ch Differential SoftSpan ADC

No Preview Available !

LTC2344-18
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage (VDD)...................................................6V
Supply Voltage (OVDD).................................................6V
Internal Regulated Supply Bypass (VDDLBYP).... (Note 3)
Analog Input Voltage
IN0+ to IN3+,
IN0to IN3(Note 4)................... –0.3V to (VDD + 0.3V)
REFIN..................................................... –0.3V to 2.8V
REFBUF, CNV (Note 4).............. –0.3V to (VDD + 0.3V)
Digital Input Voltage (Note 4)...... –0.3V to (OVDD + 0.3V)
Digital Output Voltage (Note 4)... –0.3V to (OVDD + 0.3V)
Power Dissipation............................................... 500mW
Operating Temperature Range
LTC2344C................................................. 0°C to 70°C
LTC2344I..............................................–40°C to 85°C
LTC2344H........................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
IN31
IN3+ 2
IN23
IN2+ 4
IN15
IN1+ 6
IN07
IN0+ 8
32 31 30 29 28 27 26 25
24
23
22
33
21
GND
20
19
18
17
SDO+/SDO3
SCKO/SDO2
SCKO+/SCKO
OVDD
GND
SCKI/SCKI
SCKI+/SDO1
SDI/SDO0
9 10 11 12 13 14 15 16
UH PACKAGE
32-LEAD (5mm × 5mm) PLASTIC QFN
TJMAX = 150°C, θJA = 44°C/W
EXPOSED PAD (PIN 33) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LTC2344-18#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC2344CUH-18#PBF
LTC2344CUH-18#TRPBF 234418
32-Lead (5mm × 5mm) Plastic QFN
0°C to 70°C
LTC2344IUH-18#PBF
LTC2344IUH-18#TRPBF 234418
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 85°C
LTC2344HUH-18#PBF LTC2344HUH-18#TRPBF 234418
32-Lead (5mm × 5mm) Plastic QFN
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
234418f
2
For more information www.linear.com/LTC2344-18


Part Number LTC2344IUH-18
Description 400ksps/ch Differential SoftSpan ADC
Maker Linear Technology
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LTC2344IUH-18 Datasheet PDF






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