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PDF LTC2345-18 Data sheet ( Hoja de datos )
| Número de pieza | LTC2345-18 | |
| Descripción | Differential SoftSpan ADC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
LTC2345-18
Octal, 18-Bit, 200ksps
Differential SoftSpan ADC with
Wide Input Common Mode Range
Description
nn 200ksps per Channel Throughput
nn Eight Simultaneous Sampling Channels
nn ±5LSB 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 91.8dB Single-Conversion SNR (Typical)
nn −113dB 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 48-Lead (7mm x 7mm) QFN Package
Applications
nn Programmable Logic Controllers
nn Industrial Process Control
nn Medical Imaging
nn High Speed Data Acquisition
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-
ing the internal reference and buffer, each channel of this
SoftSpanTM ADC can be independently configured on a
conversion-by-conversion basis to accept ±4.096, 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 LTC2345-18 analog inputs allow the ADC to directly
digitize a variety of signals, simplifying signal chain design.
This input signal flexibility, combined with ±5LSB INL,
no missing codes at 18 bits, and 91.8dB SNR, makes the
LTC2345-18 an ideal choice for many applications requir-
ing wide dynamic range.
The LTC2345-18 supports pin-selectable SPI CMOS (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 7705765, 7961132, 8319673.
Other Patents pending.
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
S/H
S/H
S/H
S/H
IINN77+– S/H
EIGHT SIMULTANEOUS
SAMPLING CHANNELS
5V
0.1µF
2.2µF
1.8V TO 5V
0.1µF
VDD VDDLBYP
LTC2345-18
CMOS OR LVDS
I/O INTERFACE
OVDD LVDS/CMOS
PD
SDO0
MUX
18-BIT
SAR ADC
REFBUF REFIN GND
47µF 0.1µF
SDO7
SCKO
SCKI
SDI
CS
BUSY
CNV
234518 TA01a
SAMPLE
CLOCK
For more information www.linear.com/LTC2345-18
Integral Nonlinearity vs
Output Code and Channel
2.0
1.5 FULLY DIFFERENTIAL DR±IV4E.0(9I6NV– R=A–NING+E)
ALL CHANNELS
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–131072
–65536
0
65536 131072
OUTPUT CODE
234518 TA01b
234518f
1
1 page  
LTC2345-18
R eference Buffer Ch aracteristics The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at TA = 25°C. (Note 8)
SYMBOL
VREFBUF
IREFBUF
PARAMETER
Reference Buffer Output Voltage
REFBUF Voltage Range
REFBUF Input Impedance
REFBUF Load Current
CONDITIONS
REFIN Overdriven, VREFIN = 2.048V
REFBUF Overdriven (Notes 6, 14)
VREFIN = 0V, Buffer Disabled
VREFBUF = 5V, 8 Channels Enabled (Notes 14, 15)
VREFBUF = 5V, Acquisition Mode (Note 14)
MIN
l 4.091
l 2.5
l
TYP
4.096
13
1.5
0.39
MAX
4.101
5
1.9
UNITS
V
V
kΩ
mA
mA
D igital Inputs and Digital Outputs The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at TA = 25°C. (Note 8)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
CMOS Digital Inputs and Outputs
VIH High Level Input Voltage
VIL Low Level Input Voltage
IIN Digital Input Current
CIN Digital Input Capacitance
VOH High Level Output Voltage
VOL Low Level Output Voltage
IOZ Hi-Z Output Leakage Current
ISOURCE Output Source Current
ISINK Output Sink Current
LVDS Digital Inputs and Outputs
VIN = 0V to OVDD
IOUT = –500μA
IOUT = 500μA
VOUT = 0V to OVDD
VOUT = 0V
VOUT = OVDD
l 0.8 • OVDD
l
l –10
0.2 • OVDD
10
5
l OVDD – 0.2
l
0.2
l –10
10
–50
50
V
V
μA
pF
V
V
μA
mA
mA
VID
RID
VICM
IICM
VOD
VOCM
IOZ
Differential Input Voltage
On-Chip Input Termination
Resistance
Common-Mode Input Voltage
Common-Mode Input Current
Differential Output Voltage
Common-Mode Output Voltage
Hi-Z Output Leakage Current
CS
CS
=
=
O0VV,DVDICM
=
1.2V
VIN+ = VIN– = 0V to OVDD
RL = 100Ω Differential Termination
RL = 100Ω Differential Termination
VOUT = 0V to OVDD
l 200 350 600
l 80
106 130
10
l 0.3 1.2 2.2
l –10
10
l 275 350 425
l 1.1 1.2 1.3
l –10
10
mV
Ω
MΩ
V
μA
mV
V
μA
For more information www.linear.com/LTC2345-18
234518f
5
5 Page 
LTC2345-18
Typical Performanc e Characteristics TA = 25°C, VDD = 5V, OVDD = 2.5V, Internal
Reference and Buffer (VREFBUF = 4.096V), fSMPL = 200ksps, unless otherwise noted.
Crosstalk vs Input Frequency and
Channel
–80
–85
±4.096V RANGE
IN0+ = –INO– = 3.6VPP SINE
–90 ALL CHANNELS CONVERTING
–95
–100
CH1
–105
–110
–115
–120
–125
–130
–135
10
CH7
100 1k 10k 100k 1M
FREQUENCY (Hz)
234518 G19
SNR, SINAD vs Temperature,
fIN = 2kHz
94.0 ±4.096V RANGE
93.5 FULLY DIFFERENTIAL DRIVE (IN– = –IN+)
93.0
92.5
92.0 SNR
91.5 SINAD
91.0
90.5
90.0
89.5
89.0
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234518 G20
THD, Harmonics vs Temperature,
fIN = 2kHz
–105
–110
FULLY DIFFERENTIAL DR±IV4E.0(9IN6V– =RA–NING+E)
–115
THD
–120
2ND
–125
–130
3RD
–135
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234518 G21
INL, DNL vs Temperature
2.0 ±4.096V RANGE
1.5 FULLY DIFFERENTIAL DRIVE (IN– = –IN+)
1.0 MAX INL
0.5
0 MAX DNL
–0.5
MIN DNL
–1.0 MIN INL
–1.5
–2.0
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234518 G22
Positive Full-Scale Error vs
Temperature and Channel
0.100
0.075
±4.096V RANGE
ALL CHANNELS
0.050
0.025
0.000
–0.025
–0.050
–0.075
–0.100
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234518 G23
Negative Full-Scale Error vs
Temperature and Channel
0.100
0.075
±4.096V RANGE
ALL CHANNELS
0.050
0.025
0.000
–0.025
–0.050
–0.075
–0.100
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234518 G24
Zero-Scale Error vs
Temperature and Channel
10 ±4.096V RANGE
8 ALL CHANNELS
6
4
2
0
–2
–4
–6
–8
–10
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234518 G25
Supply Current vs Temperature
20
18
16 IVDD
14
12
10
8
6
4
2
0 IOVDD
–2
–4
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234518 G26
Power-Down Current
vs Temperature
1000
100 IVDD
10
1
0.1 IOVDD
0.01
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234518 G27
For more information www.linear.com/LTC2345-18
234518f
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| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC2345-18.PDF ] | |
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