LTC2335-18
18-Bit, 1Msps 8-Channel
Differential 1ꢀ0.24 ꢁnpꢂt ꢃSftꢃpan ꢄDC
with Wide ꢁnpꢂt CSmmSn MSde Range
DescripTion
FeaTures
The LTC®2335-18 is an 18-bit, low noise 8-channel multi-
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1Msps Throughput
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plexedsuccessiveapproximationregister(SAR)ADCwith
differential, wide common mode range inputs. Operating
froma5Vlowvoltagesupply,flexiblehighvoltagesupplies,
andusingtheinternalreferenceandbuffer,thisSoftSpanTM
ADC can be configured on a conversion-by-conversion
basis to accept 1ꢀ.2ꢁV, ꢀV to 1ꢀ.2ꢁV, 5.12V, or ꢀV to
5.12V signals on any channel. Alternately, the ADC may
be programmed to cycle through a sequence of channels
and ranges without further user intervention.
±±3LS ꢀI3 ꢁMꢂaxiuim ±1ꢃꢄ0.2 VꢂRgnꢅ
GuꢂrꢂRtnnd 18-Sxtm Io MxssxRg Codns
DxffnrnRtxꢂlm Wxdn CoiioR Modn VꢂRgn ꢀRputs
8-ChꢂRRnl Multxplnanr wxth LoftLpꢂR ꢀRput VꢂRgns:
±1ꢃꢄ0.2m ꢃ2 to 1ꢃꢄ0.2m ±ꢆꢄ102m ꢃ2 to ꢆꢄ102
±10ꢄꢆ2m ꢃ2 to 10ꢄꢆ2m ±ꢇꢄ0ꢆ2m ꢃ2 to ꢇꢄ0ꢆ2
9ꢇꢄ7dS LxRgln-CoRvnrsxoR LIV ꢁTypxcꢂlꢅ
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−1ꢃ9dS THD ꢁTypxcꢂlꢅ ꢂt f = 0kHz
ꢀI
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118dS CMVVm 10ꢆdS Actxvn Crosstꢂlk ꢁTypxcꢂlꢅ
Vꢂxl-to-Vꢂxl ꢀRput Ovnrdrxvn TolnrꢂRcn
Programmable Sequencer with No-Latency Control
Guaranteed Operation to 125°C
Integrated Reference and Buffer (ꢁ.ꢀ96V)
SPI CMOS (1.8V to 5V) and LVDS Serial I/O
No Pipeline Delay, No Cycle Latency
The wide input common mode range and 118dB CMRR of
the LTC2335-18 analog inputs allow the ADC to directly
digitize a variety of signals, simplifying signal chain de-
sign. This input signal flexibility, combined with 3LSB
INL, no missing codes at 18 bits, and 96.7dB SNR, makes
the LTC2335-18 an ideal choice for many high voltage
applications requiring wide dynamic range.
18ꢀmW Power Dissipation (Typical)
ꢁ8-Lead (7mm × 7mm) LQFP Package
TheLTC2335-18supportspin-selectableSPICMOS(1.8V
to 5V) and LVDS serial interfaces.
applicaTions
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 77ꢀ5765, 7961132, 8319673.
Other Patents pending.
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Programmable Logic Controllers
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Industrial Process Control
Power Line Monitoring
Test and Measurement
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Typical applicaTion
15V
0.1µF
5V
0.1µF
1.8V TO 5V
0.1µF
ꢀRtngrꢂl IoRlxRnꢂrxty vs
2.2µF
V
Output Codn ꢂRd ChꢂRRnl
CMOS OR LVDS
I/O INTERFACE
2.0
±±10.24V RANG
–
FULLY
DIFFERENTIAL
+5V
TRUE BIPOLAR DRIVE (IN = 0V)
1.5
1.0
V
V
OV
DD
LVDS/CMOS
CC
DD
DDLBYP
+
–
ARBITRARY
ALL CHANNELS
IN0
IN0
PD
+10V
LTC2335-18
0V
0V
0.5
SDO
SCKO
SCKI
SDI
CS
BUSY
CNV
–10V
–5V
0
18-BIT
MUX
SAMPLING
ADC
–0.5
–1.0
–1.5
–2.0
UNIPOLAR
TRUE BIPOLAR
+10V
+10V
SAMPLE
CLOCK
0V
0V
+
–
–10V
–10V
IN7
IN7
+
–
V
REFBUF REFIN
47µF
GND
0.1µF
EE
DIFFERENTIAL INPUTS IN /IN WITH
WIDE INPUT COMMON MODE RANGE
–131072 –65536
0
65536
131072
233518 TA01a
OUTPUT CODE
233518 TA01b
0.1µF
–15V
233518f
1
For more information www.linear.com/LTC2335-18
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