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PDF LTC2358-18 Data sheet ( Hoja de datos )
| Número de pieza | LTC2358-18 | |
| Descripción | 200ksps/Ch Differential ADC | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC2358-18
Buffered Octal, 18-Bit, 200ksps/Ch Differential
±10.24V ADC with 30VP-P Common Mode Range
FEATURES
nn Simultaneous Sampling of 8 Buffered Channels
nn 200ksps per Channel Throughput
nn 500pA/12nA Max Input Leakage at 85°C/125°C
nn ±3.5LSB INL (Maximum, ±10.24V Range)
nn Guaranteed 18-Bit, No Missing Codes
nn Differential, Wide Common Mode Range Inputs
nn Per-Channel SoftSpan Input Ranges:
nn ±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V
nn ±12.5V, 0V to 12.5V, ±6.25V, 0V to 6.25V
nn 96.4dB Single-Conversion SNR (Typical)
nn −111dB THD (Typical) at fIN = 2kHz
nn 128dB CMRR (Typical) at fIN = 200Hz
nn Rail-to-Rail Input Overdrive Tolerance
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 219mW Power Dissipation (27mW/Ch Typical)
nn 48-Lead (7mm x 7mm) LQFP Package
APPLICATIONS
nn Programmable Logic Controllers
nn Industrial Process Control
nn Power Line Monitoring
nn Test and Measurement
DESCRIPTION
The LTC®2358-18 is an 18-bit, low noise 8-channel simul-
taneous sampling successive approximation register (SAR)
ADC with buffered differential, wide common mode range
picoamp inputs. Operating from a 5V low voltage supply,
flexible high voltage supplies, and using the internal refer-
ence and buffer, each channel of this SoftSpanTM ADC can be
independently configured on a conversion-by-conversion
basis to accept ±10.24V, 0V to 10.24V, ±5.12V, or 0V to
5.12V signals. Individual channels may also be disabled
to increase throughput on the remaining channels.
The integrated picoamp-input analog buffers, wide input
common mode range and 128dB CMRR of the LTC2358-18
allow the ADC to directly digitize a variety of signals us-
ing minimal board space and power. This input signal
flexibility, combined with ±3.5LSB INL, no missing codes
at 18 bits, and 96.4dB SNR, makes the LTC2358-18 an
ideal choice for many high voltage applications requiring
wide dynamic range.
The LTC2358-18 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 Analog Devices Inc. All other trademarks are the property of their
respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673, 9197235.
TYPICAL APPLICATION
ARBITRARY
+10V
0V
–10V
FULLY
DIFFERENTIAL
+5V
0V
–5V
TRUE BIPOLAR
UNIPOLAR
+10V
+10V
0V 0V
–10V
–10V
DIFFERENTIAL INPUTS IN+/IN– WITH
WIDE INPUT COMMON MODE RANGE
15V 5V
0.1µF
0.1µF
2.2µF
1.8V TO 5V
0.1µF
BUFFERS
IINN00+–
S/H
S/H
VCC
CMOS OR LVDS
I/O INTERFACE
VDD VDDLBYP OVDD LVDS/CMOS
PD
LTC2358-18
S/H SDO0
S/H
S/H
S/H
S/H
IINN77+– S/H
EIGHT BUFFERED
SIMULTANEOUS
SAMPLING CHANNELS
MUX
18-BIT
SAR ADC
VEE REFBUF REFIN GND
0.1µF
–15V
47µF 0.1µF
SDO7
SCKO
SCKI
SDI
CS
BUSY
CNV
235818 TA01a
SAMPLE
CLOCK
For more information www.linear.com/LTC2358-18
Integral Nonlinearity vs
vsOOuutptpuutt CCooddeeanadnCdhaCnhnaenl nel
2.0
1.5
TRUE BIPOLAR D±R1I0V.E24(IVNR– A=N0GVE)
ALL CHANNELS
1.0
0.5
0
–0.5
–1.0
–1.5
–2.0
–131072
–65536
0
65536 131072
OUTPUT CODE
235818 TA01b
235818f
1
1 page  
LTC2358-18
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 9)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
CMOS Digital Inputs and Outputs
VIH
VIL
IIN
CIN
VOH
VOL
IOZ
ISOURCE
ISINK
High Level Input Voltage
Low Level Input Voltage
Digital Input Current
Digital Input Capacitance
High Level Output Voltage
Low Level Output Voltage
Hi-Z Output Leakage Current
Output Source Current
Output Sink Current
VIN = 0V to OVDD
IOUT = –500μA
IOUT = 500μA
VOUT = 0V to OVDD
VOUT = 0V
VOUT = OVDD
LVDS Digital Inputs and Outputs
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 = 0V, VICM = 1.2V
CS = OVDD
VIN+ = VIN– = 0V to OVDD
RL = 100Ω Differential Termination
RL = 100Ω Differential Termination
VOUT = 0V to OVDD
l 200 350 600
l 90
106 125
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
POWER REQUIREMENTS The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at TA = 25°C. (Note 9)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC Supply Voltage
VEE Supply Voltage
VCC − VEE Supply Voltage Difference
VDD Supply Voltage
IVCC Supply Current
200ksps Sample Rate, 8 Channels Enabled (Note 17)
Acquisition Mode (Note 17)
Nap Mode
Power Down Mode
l 7.5
l –16.5
l 10
l 4.75
l
l
l
l
5.00
4.6
8.5
2.9
6
38
0
38
5.25
5.3
9.8
3.3
15
V
V
V
V
mA
mA
mA
μA
IVEE Supply Current
200ksps Sample Rate, 8 Channels Enabled (Note 17)
Acquisition Mode (Note 17)
Nap Mode
Power Down Mode
l –5.5
l –9.8
l –3.5
l –15
–4.5
–8
–2.8
–4
mA
mA
mA
μA
CMOS I/O Mode
OVDD
IVDD
Supply Voltage
Supply Current
l 1.71
5.25
200ksps Sample Rate, 8 Channels Enabled
200ksps Sample Rate,
Acquisition Mode
8
Channels
Enabled,
VREFBUF
=
5V
(Notes
15)
Nap Mode
Power Down Mode (C-Grade and I-Grade)
Power Down Mode (H-Grade)
l
l
l
l
l
l
15.6 18
13.8 16
2.1 2.7
1.7 2.4
106 275
106 500
V
mA
mA
mA
mA
μA
µA
235818f
For more information www.linear.com/LTC2358-18
5
5 Page 
LTC2358-18
T YPICAL PERFORMAN CE CHARACTERISTICS TA = 25°C, VCC = +15V, VEE = –15V, VDD = 5V,
OVDD = 2.5V, Internal Reference and Buffer (VREFBUF = 4.096V), fSMPL = 200ksps, unless otherwise noted.
SNR, SINAD vs Input Level,
fIN = 2kHz
97.0 TRUE BIPOLAR D±R1I0V.E24(IVNR– A=N0GVE)
96.8
96.6 SNR
96.4
SINAD
96.2
96.0
–40
–30 –20 –10
INPUT LEVEL (dBFS)
0
235818 G19
CMRR vs Input Frequency
and Channel
140
130
IN+ = IN–±1=01.284VVP–RPASNINGEE
ALL CHANNELS
120
110
100
90
80
70
60
10
100 1k 10k 100k 1M
FREQUENCY (Hz)
235818 G20
Crosstalk vs Input Frequency
and Channel
–80
–85
–90
±IINN1000+–.2==4V01V8RVAPN–PGESINE
–95 ALL CHANNELS CONVERTING
CH1
–100
–105
CH2
–110
–115
–120
–125
–130
–135
10
CH7
100 1k 10k 100k 1M
FREQUENCY (Hz)
235818 G21
SNR, SINAD vs Temperature,
fIN = 2kHz
98.0
97.5 TRUE BIPOLAR D±R1I0V.E24(IVNR– A=N0GVE)
97.0
96.5 SNR
96.0
95.5 SINAD
95.0
94.5
94.0
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
235818 G22
THD, Harmonics vs Temperature,
fIN = 2kHz
–95 ±10.24V RANGE
TRUE BIPOLAR DRIVE (IN– = 0V)
–100
–105
–110
–115
–120
THD
2ND
3RD
–125
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
235818 G23
INL, DNL vs Temperature
2.0
1.5
MAX INL
1.0
TRUE BIPOLAR D±R1I0V.E24(IVNR– A=N0GVE)
ALL CHANNELS
0.5 MAX DNL
0
–0.5 MIN DNL
–1.0
MIN INL
–1.5
–2.0
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
235818 G24
Analog Input Leakage
Current vs Temperature
10k 16 ANALOG INPUT PIN TRACES
FOR EACH INPUT VOLTAGE
1k
100
10
1
0.1
–55 –35 –15 5
IN = 0V
IN = +10V
IN = –10V
25 45 65 85 105 125
TEMPERATURE (°C)
235818 G25
Positive Full-Scale Error vs
TTeemmppeerraattuurree aanndd CChhaannnneell
0.100
0.075
0.050
±10.24V 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
235818 G26
Zero-Scale Error vs
Temperature and Channel
5
4
±10.24V RANGE
ALL CHANNELS
3
2
1
0
–1
–2
–3
–4
–5
–55 –35 –15 5 25 45 65 85
TEMPERATURE (°C)
105 125
235818 G27
For more information www.linear.com/LTC2358-18
235818f
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11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC2358-18.PDF ] | |
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