LTC2345-18
Octal, 18-Bit, 200ksps
Differential SoftSpan ADC with
Wide Input Common Mode Range
DescripTion
FeaTures
The LTC®2345-18 is an 18-bit, low noise 8-channel si-
multaneous sampling successive approximation register
(SAR) ADC with differential, wide common mode range
inputs. Operating from a 5V low voltage supply and us-
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200ksps per Channel Throughput
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Eight Simultaneous Sampling Channels
±±5Sꢀ ꢁI5 ꢂ(aꢃimumꢄ ±ꢅꢆ0.ꢇ9 Vangeꢈ
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Guaranteed 18-ꢀitꢄ Io (issing Codes
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ing the internal reference and buffer, each channel of this
SoftSpanTM ADC can be independently configured on a
conversion-by-conversion basis to accept 4.ꢀ09, ꢀV
to 4.ꢀ09V, 2.ꢀ48V, or ꢀV to 2.ꢀ48V signals. Individual
channels may also be disabled to increase throughput on
the remaining channels.
Differentialꢄ Wide Common (ode Vange ꢁnputs
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Per-Channel SoftSpan ꢁnput Vanges:
±ꢅꢆ0.ꢇ9ꢄ 09 to ꢅꢆ0.ꢇ9ꢄ ±2ꢆ0ꢅ89ꢄ 09 to 2ꢆ0ꢅ89
±±9ꢄ 09 to ±9ꢄ ±2ꢆ±9ꢄ 09 to 2ꢆ±9
.1ꢆ8dꢀ Single-Conversion SIV ꢂTypicalꢈ
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−113dꢀ THD ꢂTypicalꢈ at f = 2kHz
ꢁI
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102dꢀ C(VV ꢂTypicalꢈ at f = 200Hz
Vail-to-Vail ꢁnput Overdrive Tolerance
Guaranteed Operation to 125°C
Integrated Reference and Buffer (4.ꢀ09V)
SPI CMOS (1.8V to 5V) and LVDS Serial I/O
Internal Conversion Clock, No Cycle Latency
81mW Power Dissipation (Typical)
The wide input common mode range and 1ꢀ2dB CMRR of
the LTC2345-18 analog inputs allow the ADC to directly
digitizeavarietyofsignals,simplifyingsignalchaindesign.
This input signal flexibility, combined with 5LSB INL,
no missing codes at 18 bits, and 01.8dB SNR, makes the
LTC2345-18 an ideal choice for many applications requir-
ing wide dynamic range.
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48-Lead (7mm x 7mm) QFN Package
TheLTC2345-18supportspin-selectableSPICMOS(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.
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 77ꢀ5795, 7091132, 8310973.
Other Patents pending.
applicaTions
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Programmable Logic Controllers
Industrial Process Control
Medical Imaging
High Speed Data Acquisition
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Typical applicaTion
5V
0.1µF
1.8V TO 5V
0.1µF
ꢁntegral Ionlinearity vs
2.2µF
V
Output Code and Channel
CMOS OR LVDS
2.0
I/O INTERFACE
±±4.096V RANG
–
+
FULLY
DIFFERENTIAL
5V
FULLY DIFFERENTIAL DRIVE (IN = –IN )
V
OV
DD
1.5
1.0
LVDS/CMOS
DD
DDLBYP
+
–
ARBITRARY
IN0
IN0
ALL CHANNELS
S/H
S/H
S/H
S/H
S/H
S/H
S/H
S/H
PD
5V
0V
LTC2345-18
0.5
SDO0
0V
5V
0V
0
18-BIT
MUX
SDO7
SCKO
SCKI
SDI
CS
BUSY
CNV
SAR ADC
UNIPOLAR
BIPOLAR
–0.5
–1.0
–1.5
–2.0
5V
0V
+
–
SAMPLE
CLOCK
IN7
IN7
+
–
REFBUF REFIN
47µF
GND
0.1µF
DIFFERENTIAL INPUTS IN /IN WITH
WIDE INPUT COMMON MODE RANGE
–131072 –65536
0
65536
131072
234518 TA01a
OUTPUT CODE
234518 TA01b
EIGHT SIMULTANEOUS
SAMPLING CHANNELS
234518f
1
For more information www.linear.com/LTC2345-18
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