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PDF LTC2344-16 Data sheet ( Hoja de datos )
| Número de pieza | LTC2344-16 | |
| Descripción | 400ksps/ch Differential SoftSpan ADC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
LTC2344-16
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.
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
VDD VDDLBYP
LTC2344-16
CMOS OR LVDS
I/O INTERFACE
OVDD LVDS/CMOS
PD
SDO0
MUX
16-BIT
SAR ADC
REFBUF REFIN GND
47µF 0.1µF
SDO3
SCKO
SCKI
SDI
CS
BUSY
CNV
234416 TA01a
SAMPLE
CLOCK
For more information www.linear.com/LTC2344-16
Integral Nonlinearity
vs Output Code and Channel
1.00
0.75 FULLY DIFFERENTIAL DR±IV4E.0(9I6NV– =RA–NING+E)
ALL CHANNELS
0.50
0.25
0
–0.25
–0.50
–0.75
–1.00
–32768
–16384
0
16384 32768
OUTPUT CODE
234416 TA01b
234416f
1
1 page  
LTC2344-16
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, 4 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/LTC2344-16
234416f
5
5 Page 
LTC2344-16
T YPICAL PERFORMANC E CHARACTERISTICS TA = 25°C, VDD = 5V, OVDD = 2.5V, Internal
Reference and Buffer (VREFBUF = 4.096V), fSMPL = 400ksps, unless otherwise noted.
Crosstalk vs Input Frequency and
Channel
–80
–85 IN0+ = –IN0–±=4.30.966VVP-RPASNIGNEE
–90 ALL CHANNELS CONVERTING
–95
–100
CH1
–105
–110
–115
–120
–125
–130
–135
10
CH3
100 1k 10k 100k 1M
FREQUENCY (Hz)
234416 G19
SNR, SINAD vs Temperature,
fIN = 2kHz
95.0
94.5 FULLY DIFFERENTIAL DR±IV4E.0(9I6NV– =RA–NING+E)
94.0
93.5 SNR
93.0 SINAD
92.5
92.0
91.5
91.0
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234416 G20
THD, Harmonics vs Temperature,
fIN = 2kHz
–100
–105
±4.096V RANGE
FULLY DIFFERENTIAL DRIVE (IN– = –IN+)
–110
THD
–115
–120
–125
2ND
3RD
–130
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234416 G21
INL, DNL vs Temperature
0.5
0.4 FULLY DIFFERENTIAL DR±IV4E.0(9I6NV– =RA–NING+E)
0.3
0.2 MAX DNL
0.1
0.0 MAX INL
–0.1
MIN DNL
–0.2
–0.3 MIN INL
–0.4
–0.5
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234416 G22
Positive Full-Scale Error vs
Temperature and Channel
0.100
0.075
0.050
±4.096V RANGE
REFBUF OVERDRIVEN
VREFBUF = 4.096V
ALL CHANNELS
0.025
0.000
–0.025
–0.050
–0.075
–0.100
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234416 G23
Negative Full-Scale Error vs
Temperature and Channel
0.100
0.075
0.050
±4.096V RANGE
REFBUF OVERDRIVEN
VREFBUF = 4.096V
ALL CHANNELS
0.025
0.000
–0.025
–0.050
–0.075
–0.100
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234416 G24
Zero-Scale Error vs
Temperature and Channel
5
±4.096V RANGE
4 ALL CHANNELS
3
2
1
0
–1
–2
–3
–4
–5
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
234416 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
234416 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
234416 G27
For more information www.linear.com/LTC2344-16
234416f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC2344-16.PDF ] | |
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