LTC2358-18 - Buffered Octal, 18-Bit, 200ksps/Ch Differential ±10.24V ADC with 30VP-P Common

38 Pages·2017·2.15 MB·English

by  Analog Devices, Inc

LTC2358-18
Buffered Octal, 18-Bit, 200ksps/Ch Differential
±10.24V ADC with 30V Common Mode Range
P-P
FEATURES DESCRIPTION
n Simultaneous Sampling of 8 Buffered Channels The LTC®2358-18 is an 18-bit, low noise 8-channel simul-
n 200ksps per Channel Throughput taneous sampling successive approximation register (SAR)
n 500pA/12nA Max Input Leakage at 85°C/125°C ADC with buffered differential, wide common mode range
n ±3.5LSB INL (Maximum, ±10.24V Range) picoamp inputs. Operating from a 5V low voltage supply,
n Guaranteed 18-Bit, No Missing Codes flexible high voltage supplies, and using the internal refer-
n Differential, Wide Common Mode Range Inputs ence and buffer, each channel of this SoftSpanTM ADC can be
n Per-Channel SoftSpan Input Ranges: independently configured on a conversion-by-conversion
n ±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V basis to accept ±10.24V, 0V to 10.24V, ±5.12V, or 0V to
n ±12.5V, 0V to 12.5V, ±6.25V, 0V to 6.25V 5.12V signals. Individual channels may also be disabled
n 96.4dB Single-Conversion SNR (Typical) to increase throughput on the remaining channels.
n −111dB THD (Typical) at f = 2kHz
IN The integrated picoamp-input analog buffers, wide input
n 128dB CMRR (Typical) at f = 200Hz
IN common mode range and 128dB CMRR of the LTC2358-18
n Rail-to-Rail Input Overdrive Tolerance
allow the ADC to directly digitize a variety of signals us-
n Integrated Reference and Buffer (4.096V)
ing minimal board space and power. This input signal
n SPI CMOS (1.8V to 5V) and LVDS Serial I/O
flexibility, combined with ±3.5LSB INL, no missing codes
n Internal Conversion Clock, No Cycle Latency
at 18 bits, and 96.4dB SNR, makes the LTC2358-18 an
n 219mW Power Dissipation (27mW/Ch Typical)
ideal choice for many high voltage applications requiring
n 48-Lead (7mm x 7mm) LQFP Package
wide dynamic range.
The LTC2358-18 supports pin-selectable SPI CMOS (1.8V
APPLICATIONS
to 5V) and LVDS serial interfaces. Between one and eight
lanes of data output may be employed in CMOS mode,
n Programmable Logic Controllers
allowing the user to optimize bus width and throughput.
n Industrial Process Control
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
n Power Line Monitoring
SoftSpan is a trademark of Analog Devices Inc. All other trademarks are the property of their
n Test and Measurement respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673, 9197235.
TYPICAL APPLICATION
15V 5V 1.8V TO 5V
0.1µF 0.1µF 2.2µF 0.1µF Integral Nonlinearity vs
CMOS OR LVDS Output Code and Channel
I/O INTERFACE vs Output Code and Channel
+10VARBITRARY +5VDIFFFEURLELNYTIAL IINNB00U+–FFERS S/H VCC VDD VDDLBYP OVDD LVDS/CMOPDS 12..50 TRUE BIPOLAR D±AR1LI0VL.E 2C 4(HIVNA R–N AN=N E0GLVSE)
0V 0V S/H LTC2358-18 1.0
+–1100TVVRUE BIPOLAR +1–05VVUNIPOLAR (cid:127) (cid:127) (cid:127) SSSS////HHHH MUX S1A8R- BAIDTC SSSSCDD(cid:127) (cid:127) (cid:127)CKOOKO07I NL ERROR (LSB) –00..505
SDI I
0V 0V S/H CS –1.0
–1D0IVFFERENTIAL INPU–T1S0 VIN+/IN– WITH IINN77+– S/H VEE REFBUF REFIN GND BUCNSYV SCALOMCPKLE –1.5
WIDE INPUT COMMON MODE RANGE 235818 TA01a –2–.1031072 –65536 0 65536 131072
EIGHT BUFFERED 0.1µF 47µF 0.1µF OUTPUT CODE
SIMULTANEOUS 235818 TA01b
SAMPLING CHANNELS –15V
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LTC2358-18
ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION
(Notes 1, 2)
Supply Voltage (V ) .....................–0.3V to (V + 40V) TOP VIEW
CC EE
P
SSuuppppllyy VVoollttaaggee (DVifEfEe)r .e..n..c..e. .(..V..C..C.. .–.. .V..E.E..). ...........–..1..7...4..V... .t.o.. .04.03VV +IN7–IN7GNDVEEGNDVDDVDDGNDVDDLBYCSBUSYSDI
876543210987
Supply Voltage (V ) ..................................................6V 444444444333
DD
Supply Voltage (OV ) ................................................6V
DD
Internal Regulated Supply Bypass (V ) ... (Note 3) IN6– 1 36SDO7
DDLBYP IN6+ 2 35SDO–/SDO6
Analog Input Voltage IN5– 3 34SDO+/SDO5
IN0+ to IN7+, IN5+– 4 33SCKO+–/SDO4
IN4 5 32SCKO /SCKO
IN0– to IN7– (Note 4) .........(VEE – 0.3V) to (VCC + 0.3V) IINN43+– 67 3310OGVNDDD
REFIN ....................................................–0.3V to 2.8V IN3+ 8 29SCKI–/SCKI
IN2– 9 28SCKI+/SDO3
REFBUF, CNV (Note 5) .............–0.3V to (VDD + 0.3V) IINN21+–1101 2276SSDDII–+//SSDDOO21
Digital Input Voltage (Note 5) .....–0.3V to (OV + 0.3V) +
DD IN1 12 25SDO0
Digital Output Voltage (Note 5) ..–0.3V to (OV + 0.3V)
DD
Power Dissipation ..............................................500mW
345678901234
O pLeTraCt2in3g5 8TeCm ..p..e..r..a.t..u.r..e.. .R..a..n..g..e.......................0°C to 70°C –1IN0+1IN0GND1V1CCV1EEGND1REFIN1GND2EFBUF2PD2CMOS2CNV2
R S/
LTC2358I .............................................–40°C to 85°C VD
L
LTC2358H ..........................................–40°C to 125°C
LX PACKAGE
Storage Temperature Range ..................–65°C to 150°C 48-LEAD (7mm × 7mm) PLASTIC LQFP
TJMAX = 150°C, θJA = 53°C/W
ORDER INFORMATION
http://www.linear.com/product/LTC2358-18#orderinfo
TRAY PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC2358CLX-18#PBF LTC2358LX-18 48-Lead (7mm × 7mm) Plastic LQFP 0°C to 70°C
LTC2358ILX-18#PBF LTC2358LX-18 48-Lead (7mm × 7mm) Plastic LQFP –40°C to 85°C
LTC2358HLX-18#PBF LTC2358LX-18 48-Lead (7mm × 7mm) Plastic LQFP –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
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LTC2358-18
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. (Note 6)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V + Absolute Input Range (Note 7) l V + 4 V – 4 V
IN EE CC
(IN0+ to IN7+)
V – Absolute Input Range (Note 7) l V + 4 V – 4 V
IN EE CC
(IN0– to IN7–)
V + – V – Input Differential Voltage SoftSpan 7: ±2.5 • V Range (Note 7) l –2.5 • V 2.5 • V V
IN IN REFBUF REFBUF REFBUF
Range SoftSpan 6: ±2.5 • V /1.024 Range (Note 7) l –2.5 • V /1.024 2.5 • V /1.024 V
REFBUF REFBUF REFBUF
SoftSpan 5: 0V to 2.5 • V Range (Note 7) l 0 2.5 • V V
REFBUF REFBUF
SoftSpan 4: 0V to 2.5 • V /1.024 Range (Note 7) l 0 2.5 • V /1.024 V
REFBUF REFBUF
SoftSpan 3: ±1.25 • V Range (Note 7) l –1.25 • V 1.25 • V V
REFBUF REFBUF REFBUF
SoftSpan 2: ±1.25 • V /1.024 Range (Note 7) l –1.25 • V /1.024 1.25 • V /1.024 V
REFBUF REFBUF REFBUF
SoftSpan 1: 0V to 1.25 • V Range (Note 7) l 0 1.25 • V V
REFBUF REFBUF
V Input Common Mode Voltage (Note 7) l V + 4 V – 4 V
CM EE CC
Range
V + – V – Input Differential Overdrive (Note 8) l −(V − V ) (V − V ) V
IN IN CC EE CC EE
Tolerance
I Input Overdrive V + > V , V – > V (Note 8) l 10 mA
OVERDRIVE IN CC IN CC
Current Tolerance V + < V , V – < V (Note 8) l 0 mA
IN EE IN EE
I Analog Input Leakage Current 5 pA
IN
C-Grade and I-Grade l 500 pA
H-Grade l 12 nA
R Analog Input Resistance For Each Pin >1000 GΩ
IN
C Analog Input Capacitance 3 pF
IN
CMRR Input Common Mode V + = V − = 18V 200Hz Sine l 100 128 dB
IN IN P-P
Rejection Ratio
V CNV High Level Input Voltage l 1.3 V
IHCNV
V CNV Low Level Input Voltage l 0.5 V
ILCNV
I CNV Input Current V = 0V to V l –10 10 μA
INCNV IN DD
CONVERTER CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. (Note 9)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Resolution l 18 Bits
No Missing Codes l 18 Bits
Transition Noise SoftSpans 7 and 6: ±10.24V and ±10V Ranges 1.4 LSB
RMS
SoftSpans 5 and 4: 0V to 10.24V and 0V to 10V Ranges 2.8 LSB
RMS
SoftSpans 3 and 2: ±5.12V and ±5V Ranges 2.1 LSB
RMS
SoftSpan 1: 0V to 5.12V Range 4.2 LSB
RMS
INL Integral Linearity Error SoftSpans 7 and 6: ±10.24V and ±10V Ranges (Note 10) l –3.5 ±1 3.5 LSB
SoftSpans 5 and 4: 0V to 10.24V and 0V to 10V Ranges (Note 10) l –4 ±1.5 4 LSB
SoftSpans 3 and 2: ±5.12V and ±5V Ranges (Note 10) l –4 ±0.75 4 LSB
SoftSpan 1: 0V to 5.12V Range (Note 10) l –6 ±0.75 6 LSB
DNL Differential Linearity Error (Note 11) l −0.9 ±0.2 0.9 LSB
ZSE Zero-Scale Error (Note 12) l −700 ±160 700 μV
Zero-Scale Error Drift ±4 μV/°C
FSE Full-Scale Error V = 4.096V (REFBUF Overdriven) (Note 12) l −0.1 ±0.025 0.1 %FS
REFBUF
Full-Scale Error Drift V = 4.096V (REFBUF Overdriven) (Note 12) ±2.5 ppm/°C
REFBUF
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LTC2358-18
DYNAMIC ACCURACY
The l denotes the specifications which apply over the full operating temperature range,
otherwise specifications are at T = 25°C. A = –1dBFS. (Notes 9, 13)
A IN
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SINAD Signal-to-(Noise + SoftSpans 7 and 6: ±10.24V and ±10V Ranges, f = 2kHz l 92.7 96.2 dB
IN
Distortion) Ratio SoftSpans 5 and 4: 0V to 10.24V and 0V to 10V Ranges, f = 2kHz l 87.3 90.3 dB
IN
SoftSpans 3 and 2: ±5.12V and ±5V Ranges, f = 2kHz l 89.3 92.5 dB
IN
SoftSpan 1: 0V to 5.12V Range, f = 2kHz l 83.6 86.6 dB
IN
SNR Signal-to-Noise Ratio SoftSpans 7 and 6: ±10.24V and ±10V Ranges, f = 2kHz l 93.4 96.4 dB
IN
SoftSpans 5 and 4: 0V to 10.24V and 0V to 10V Ranges, f = 2kHz l 87.4 90.4 dB
IN
SoftSpans 3 and 2: ±5.12V and ±5V Ranges, f = 2kHz l 89.5 92.5 dB
IN
SoftSpan 1: 0V to 5.12V Range, f = 2kHz l 83.7 86.6 dB
IN
THD Total Harmonic Distortion SoftSpans 7 and 6: ±10.24V and ±10V Ranges, f = 2kHz l –111 –101 dB
IN
SoftSpans 5 and 4: 0V to 10.24V and 0V to 10V Ranges, f = 2kHz l –107 –99 dB
IN
SoftSpans 3 and 2: ±5.12V and ±5V Ranges, f = 2kHz l –113 –102 dB
IN
SoftSpan 1: 0V to 5.12V Range, f = 2kHz l –113 –100 dB
IN
SFDR Spurious Free Dynamic SoftSpans 7 and 6: ±10.24V and ±10V Ranges, f = 2kHz l 101 113 dB
IN
Range SoftSpans 5 and 4: 0V to 10.24V and 0V to 10V Ranges, f = 2kHz l 99 107 dB
IN
SoftSpans 3 and 2: ±5.12V and ±5V Ranges, f = 2kHz l 103 113 dB
IN
SoftSpan 1: 0V to 5.12V Range, f = 2kHz l 103 113 dB
IN
Channel-to-Channel One Channel Converting 18V 200Hz Sine in ±10.24V Range, −109 dB
P-P
Crosstalk Crosstalk to All Other Channels
–3dB Input Bandwidth 6 MHz
Aperture Delay 1 ns
Aperture Delay Matching 150 ps
Aperture Jitter 3 ps
RMS
Transient Response Full-Scale Step, 0.005% Settling 420 ns
INTERNAL REFERENCE CHARACTERISTICS
The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T = 25°C. (Note 9)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V Internal Reference Output Voltage 2.043 2.048 2.053 V
REFIN
Internal Reference Temperature Coefficient (Note 14) l 5 20 ppm/°C
Internal Reference Line Regulation V = 4.75V to 5.25V 0.1 mV/V
DD
Internal Reference Output Impedance 20 kΩ
V REFIN Voltage Range REFIN Overdriven (Note 7) 1.25 2.2 V
REFIN
REFERENCE BUFFER CHARACTERISTICS
The l denotes the specifications which apply over the full
operating temperature range, otherwise specifications are at T = 25°C. (Note 9)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V Reference Buffer Output Voltage REFIN Overdriven, V = 2.048V l 4.091 4.096 4.101 V
REFBUF REFIN
REFBUF Voltage Range REFBUF Overdriven (Notes 7, 15) l 2.5 5 V
REFBUF Input Impedance V = 0V, Buffer Disabled 13 kΩ
REFIN
I REFBUF Load Current V = 5V, 8 Channels Enabled (Notes 15, 16) l 1.5 1.9 mA
REFBUF REFBUF
V = 5V, Acquisition or Nap Mode (Note 15) 0.39 mA
REFBUF
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LTC2358-18
DIGITAL INPUTS AND DIGITAL OUTPUTS
The l denotes the specifications which apply over the
full operating temperature range, otherwise specifications are at T = 25°C. (Note 9)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
CMOS Digital Inputs and Outputs
V High Level Input Voltage l 0.8 • OV V
IH DD
V Low Level Input Voltage l 0.2 • OV V
IL DD
I Digital Input Current V = 0V to OV l –10 10 μA
IN IN DD
C Digital Input Capacitance 5 pF
IN
V High Level Output Voltage I = –500μA l OV  – 0.2 V
OH OUT DD
V Low Level Output Voltage I = 500μA l 0.2 V
OL OUT
I Hi-Z Output Leakage Current V = 0V to OV l –10 10 μA
OZ OUT DD
I Output Source Current V = 0V –50 mA
SOURCE OUT
I Output Sink Current V = OV 50 mA
SINK OUT DD
LVDS Digital Inputs and Outputs
V Differential Input Voltage l 200 350 600 mV
ID
R On-Chip Input Termination CS = 0V, V = 1.2V l 90 106 125 Ω
ID ICM
Resistance CS = OV 10 MΩ
DD
V Common-Mode Input Voltage l 0.3 1.2 2.2 V
ICM
I Common-Mode Input Current V + = V – = 0V to OV l –10 10 μA
ICM IN IN DD
V Differential Output Voltage R = 100Ω Differential Termination l 275 350 425 mV
OD L
V Common-Mode Output Voltage R = 100Ω Differential Termination l 1.1 1.2 1.3 V
OCM L
I Hi-Z Output Leakage Current V = 0V to OV l –10 10 μA
OZ OUT DD
POWER REQUIREMENTS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T = 25°C. (Note 9)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V Supply Voltage l 7.5 38 V
CC
V Supply Voltage l –16.5 0 V
EE
V − V Supply Voltage Difference l 10 38 V
CC EE
V Supply Voltage l 4.75 5.00 5.25 V
DD
I Supply Current 200ksps Sample Rate, 8 Channels Enabled (Note 17) l 4.6 5.3 mA
VCC
Acquisition Mode (Note 17) l 8.5 9.8 mA
Nap Mode l 2.9 3.3 mA
Power Down Mode l 6 15 μA
I Supply Current 200ksps Sample Rate, 8 Channels Enabled (Note 17) l –5.5 –4.5 mA
VEE
Acquisition Mode (Note 17) l –9.8 –8 mA
Nap Mode l –3.5 –2.8 mA
Power Down Mode l –15 –4 μA
CMOS I/O Mode
OV Supply Voltage l 1.71 5.25 V
DD
I Supply Current 200ksps Sample Rate, 8 Channels Enabled l 15.6 18 mA
VDD
200ksps Sample Rate, 8 Channels Enabled, V = 5V (Notes 15) l 13.8 16 mA
REFBUF
Acquisition Mode l 2.1 2.7 mA
Nap Mode l 1.7 2.4 mA
Power Down Mode (C-Grade and I-Grade) l 106 275 μA
Power Down Mode (H-Grade) l 106 500 µA
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LTC2358-18
POWER REQUIREMENTS
The l denotes the specifications which apply over the full operating temperature
range, otherwise specifications are at T = 25°C. (Note 9)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I Supply Current 200ksps Sample Rate, 8 Channels Enabled (C = 25pF) l 1.6 2.6 mA
OVDD L
Acquisition or Nap Mode l 1 20 μA
Power Down Mode l 1 20 μA
P Power Dissipation 200ksps Sample Rate, 8 Channels Enabled l 219 259 mW
D
Acquisition Mode l 258 308 mW
Nap Mode l 94 114 mW
Power Down Mode (C-Grade and I-Grade) l 0.68 1.9 mW
Power Down Mode (H-Grade) l 0.68 3 mW
LVDS I/O Mode
OV Supply Voltage l 2.375 5.25 V
DD
I Supply Current 200ksps Sample Rate, 8 Channels Enabled l 18.4 20.7 mA
VDD
200ksps Sample Rate, 8 Channels Enabled, V = 5V (Note 15) l 16.8 19.2 mA
REFBUF
Acquisition Mode l 3.7 4.5 mA
Nap Mode l 3.4 4.1 mA
Power Down Mode (C-Grade and I-Grade) l 106 275 μA
Power Down Mode (H-Grade) l 106 500 µA
I Supply Current 200ksps Sample Rate, 8 Channels Enabled (R = 100Ω) l 7 8.5 mA
OVDD L
Acquisition or Nap Mode (R = 100Ω) l 7 8.0 mA
L
Power Down Mode l 1 20 μA
P Power Dissipation 200ksps Sample Rate, 8 Channels Enabled l 245 287 mW
D
Acquisition Mode l 284 337 mW
Nap Mode l 120 143 mW
Power Down Mode (C-Grade and I-Grade) l 0.68 1.9 mW
Power Down Mode (H-Grade) l 0.68 3 mW
ADC TIMING CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. (Note 9)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
f Maximum Sampling Frequency 8 Channels Enabled l 200 ksps
SMPL
7 Channels Enabled l 225 ksps
6 Channels Enabled l 250 ksps
5 Channels Enabled l 300 ksps
4 Channels Enabled l 350 ksps
3 Channels Enabled l 425 ksps
2 Channels Enabled l 550 ksps
1 Channel Enabled l 800 ksps
t Time Between Conversions 8 Channels Enabled, f = 200ksps l 5000 ns
CYC SMPL
7 Channels Enabled, f = 225ksps l 4444 ns
SMPL
6 Channels Enabled, f = 250ksps l 4000 ns
SMPL
5 Channels Enabled, f = 300ksps l 3333 ns
SMPL
4 Channels Enabled, f = 350ksps l 2855 ns
SMPL
3 Channels Enabled, f = 425ksps l 2350 ns
SMPL
2 Channels Enabled, f = 550ksps l 1815 ns
SMPL
1 Channel Enabled, f = 800ksps l 1250 ns
SMPL
t Conversion Time N Channels Enabled, 1 ≤ N ≤ 8 l 450•N 500•N 550•N ns
CONV
t Acquisition Time 8 Channels Enabled, f = 200ksps l 570 980 ns
ACQ SMPL
(t = t – t – t ) 7 Channels Enabled, f = 225ksps l 564 924 ns
ACQ CYC CONV BUSYLH SMPL
6 Channels Enabled, f = 250ksps l 670 980 ns
SMPL
5 Channels Enabled, f = 300ksps l 553 813 ns
SMPL
4 Channels Enabled, f = 350ksps l 625 835 ns
SMPL
3 Channels Enabled, f = 425ksps l 670 830 ns
SMPL
2 Channels Enabled, f = 550ksps l 685 795 ns
SMPL
1 Channel Enabled, f = 800ksps l 670 730 ns
SMPL
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LTC2358-18
ADC TIMING CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T = 25°C. (Note 9)
A
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t CNV High Time l 40 ns
CNVH
t CNV Low Time l 750 ns
CNVL
t CNV↑ to BUSY Delay C = 25pF l 30 ns
BUSYLH L
t Digital I/O Quiet Time from CNV↑ l 20 ns
QUIET
t PD High Time l 40 ns
PDH
t PD Low Time l 40 ns
PDL
t REFBUF Wake-Up Time C = 47μF, C = 0.1μF 200 ms
WAKE REFBUF REFIN
CMOS I/O Mode
t SCKI Period (Notes 18, 19) l 10 ns
SCKI
t SCKI High Time l 4 ns
SCKIH
t SCKI Low Time l 4 ns
SCKIL
t SDI Setup Time from SCKI↑ (Note 18) l 2 ns
SSDISCKI
t SDI Hold Time from SCKI↑ (Note 18) l 1 ns
HSDISCKI
t SDO Data Valid Delay from SCKI↑ C = 25pF (Note 18) l 7.5 ns
DSDOSCKI L
t SDO Remains Valid Delay from SCKI↑ C = 25pF (Note 18) l 1.5 ns
HSDOSCKI L
t SDO to SCKO Skew (Note 18) l –1 0 1 ns
SKEW
t SDO Data Valid Delay from BUSY↓ C = 25pF (Note 18) l 0 ns
DSDOBUSYL L
t Bus Enable Time After CS↓ (Note 18) l 15 ns
EN
t Bus Relinquish Time After CS↑ (Note 18) l 15 ns
DIS
LVDS I/O Mode
t SCKI Period (Note 20) l 4 ns
SCKI
t SCKI High Time (Note 20) l 1.5 ns
SCKIH
t SCKI Low Time (Note 20) l 1.5 ns
SCKIL
t SDI Setup Time from SCKI (Notes 11, 20) l 1.2 ns
SSDISCKI
t SDI Hold Time from SCKI (Notes 11, 20) l –0.2 ns
HSDISCKI
t SDO Data Valid Delay from SCKI (Notes 11, 20) l 6 ns
DSDOSCKI
t SDO Remains Valid Delay from SCKI (Notes 11, 20) l 1 ns
HSDOSCKI
t SDO to SCKO Skew (Note 11) l –0.4 0 0.4 ns
SKEW
t SDO Data Valid Delay from BUSY↓ (Note 11) l 0 ns
DSDOBUSYL
t Bus Enable Time After CS↓ l 50 ns
EN
t Bus Relinquish Time After CS↑ l 15 ns
DIS
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LTC2358-18
ADC TIMING CHARACTERISTICS
Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 10: Integral nonlinearity is defined as the deviation of a code from a
may cause permanent damage to the device. Exposure to any Absolute straight line passing through the actual endpoints of the transfer curve.
Maximum Rating condition for extended periods may affect device The deviation is measured from the center of the quantization band.
reliability and lifetime. Note 11: Guaranteed by design, not subject to test.
Note 2: All voltage values are with respect to GND. Note 12: For bipolar SoftSpan ranges 7, 6, 3, and 2, zero-scale error
Note 3: V is the output of an internal voltage regulator, and should is the offset voltage measured from –0.5LSB when the output code
DDLBYP
only be connected to a 2.2μF ceramic capacitor to bypass the pin to GND, flickers between 00 0000 0000 0000 0000 and 11 1111 1111 1111 1111.
as described in the Pin Functions section. Do not connect this pin to any Full-scale error for these SoftSpan ranges is the worst-case deviation of
external circuitry. the first and last code transitions from ideal and includes the effect of
Note 4: When these pin voltages are taken below V or above V , they offset error. For unipolar SoftSpan ranges 5, 4, and 1, zero-scale error is
EE CC
will be clamped by internal diodes. This product can handle input currents the offset voltage measured from 0.5LSB when the output code flickers
of up to 100mA below V or above V without latch-up. between 00 0000 0000 0000 0000 and 00 0000 0000 0000 0001. Full-
EE CC
scale error for these SoftSpan ranges is the worst-case deviation of the
Note 5: When these pin voltages are taken below GND or above V or
DD
last code transition from ideal and includes the effect of offset error.
OV , they will be clamped by internal diodes. This product can handle
DD
currents of up to 100mA below GND or above V or OV without latch- Note 13: All specifications in dB are referred to a full-scale input in the
DD DD
up. relevant SoftSpan input range, except for crosstalk, which is referred to
the crosstalk injection signal amplitude.
Note 6: –16.5V ≤ V ≤ 0V, 7.5V ≤ V ≤ 38V, 10V ≤ (V – V ) ≤ 38V,
EE CC CC EE
V = 5V, unless otherwise specified. Note 14: Temperature coefficient is calculated by dividing the maximum
DD 
change in output voltage by the specified temperature range.
Note 7: Recommended operating conditions.
Note 15: When REFBUF is overdriven, the internal reference buffer must
Note 8: Exceeding these limits on any channel may corrupt conversion
be disabled by setting REFIN = 0V.
results on other channels. Driving an analog input above V on any
CC
channel up to 10mA will not affect conversion results on other channels. Note 16: IREFBUF varies proportionally with sample rate and the number of
Driving an analog input below V may corrupt conversion results on other active channels.
EE
channels. Refer to Applications Information section for further details. Note 17: Analog input buffer supply currents from I and I are
VCC VEE
Refer to Absolute Maximum Ratings section for pin voltage limits related reduced outside the acquisition period. Refer to nap mode in Applications
to device reliability. Information section.
Note 9: V = 15V, V = –15V, V = 5V, OV = 2.5V, f = 200ksps, Note 18: Parameter tested and guaranteed at OV = 1.71V, OV = 2.5V,
CC EE DD DD  SMPL DD DD
internal reference and buffer, true bipolar input signal drive in bipolar and OV = 5.25V.
DD
SoftSpan ranges, unipolar signal drive in unipolar SoftSpan ranges, unless Note 19: A t period of 10ns minimum allows a shift clock frequency of
SCKI
otherwise specified. up to 100MHz for rising edge capture.
Note 20: V = 1.2V, V = 350mV for LVDS differential input pairs.
ICM ID
CMOS Timings
0.8 • OVDD tWIDTH
0.2 • OVDD
tDELAY tDELAY 50% 50%
0.8 • OVDD 0.8 • OVDD 235818 F01
0.2 • OVDD 0.2 • OVDD
LVDS Timings (Differential)
+200mV
tWIDTH
–200mV
tDELAY tDELAY 0V 0V
+200mV +200mV 235818 F01b
–200mV –200mV
Figure 1. Voltage Levels for Timing Specifications
235818f
8
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LTC2358-18
TYPICAL PERFORMANCE CHARACTERISTICS
T = 25°C, V  = +15V, V  = –15V, V  = 5V,
A CC EE DD
OV  = 2.5V, Internal Reference and Buffer (V  = 4.096V), f = 200ksps, unless otherwise noted.
DD REFBUF SMPL
Integral Nonlinearity Integral Nonlinearity Differential Nonlinearity
vvss OOuuttppuutt CCooddee aanndd CChhaannnneell vs Output Code and Channel vs Output Code and Channel
2.0 2.0 0.5
±10.24V RANGE ±10.24V RANGE ALL RANGES
1.5 TRUE BIPOLAR DRIVE (IN– = 0V) 1.5 FULLY DIFFERENTIAL DRIVE (IN– = –IN+) 0.4 ALL CHANNELS
ALL CHANNELS ALL CHANNELS
0.3
1.0 1.0
0.2
INL ERROR (LSB) –00..505 INL ERROR (LSB) –00..505 DNL ERROR (LSB)––0000....2101
–1.0 –1.0
–0.3
–1.5 –1.5
–0.4
–2.0 –2.0 –0.5
–131072 –65536 0 65536 131072 –131072 –65536 0 65536 131072 0 65536 131072 196608 262144
OUTPUT CODE OUTPUT CODE OUTPUT CODE
235818 G01 235818 G02 235818 G03
Integral Nonlinearity Integral Nonlinearity Integral Nonlinearity
vs Output Code and Range vvss OOuuttppuutt CCooddee aanndd RRaannggee vs Output Code and Range
2.0 2.0 2.0
TRUE BIPOLAR DRIVE (IN– = 0V) FULLY DIFFERENTIAL DRIVE (IN– = –IN+) UNIPOLAR DRIVE (IN– = 0V)
1.5 ONE CHANNEL 1.5 ONE CHANNEL 1.5 ONE CHANNEL
1.0 1.0 ±5.12V, AND ±5V 1.0
SB) 0.5 SB) 0.5 RANGES SB) 0.5 0V TO 5.12V RANGE
R (L R (L R (L
O 0 O 0 O 0
R R R
R R R
INL E –0.5 ±5.12V AND ±5V ±10.24V AND ±10V INL E –0.5 ±10.2R4VA, N±G1E0SV INL E –0.5
–1.0 RANGES RANGES –1.0 –1.0
–1.5 –1.5 –1.5 0V TO 10.24V AND
0V TO 10V RANGES
–2.0 –2.0 –2.0
–131072 –65536 0 65536 131072 –131072 –65536 0 65536 131072 0 65536 131072 196608 262144
OUTPUT CODE OUTPUT CODE OUTPUT CODE
235818 G04 235818 G05 235818 G06
Integral Nonlinearity
vs Output Code DC Histogram (Zero-Scale) DC Histogram (Near Full-Scale)
2.0 100000 90000
±10.24V RANGE ±10.24V RANGE ±10.24V RANGE
1.5 TRUE BIPOLAR DRIVE (IN– = 0V) 90000 σ = 1.35 80000 σ = 1.4
80000 70000
1.0
70000
B) 60000
L ERROR (LS –00..505 COUNTS 456000000000000 COUNTS 4500000000
N 30000
I 30000
–1.0
20000 20000
ARBITRARY DRIVE
–1.5 IN+/IN– COMMON MODE 10000 10000
SWEPT –10.24V to 10.24V
–2.0 0 0
–131072 –65536 0 65536 131072 –6 –4 –2 0 2 4 6 131024 131027 131030 131033 131036
OUTPUT CODE CODE CODE
235818 G07 235818 G08 235818 G09
235818f
9
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LTC2358-18
TYPICAL PERFORMANCE CHARACTERISTICS
T = 25°C, V  = +15V, V  = –15V, V  = 5V,
A CC EE DD
OV  = 2.5V, Internal Reference and Buffer (V  = 4.096V), f = 200ksps, unless otherwise noted.
DD REFBUF SMPL
32k Point Arbitrary Two-Tone FFT
32k Point FFT fSMPL = 200kHz, 32k Point FFT fSMPL = 200kHz, fSMPL = 200kHz, IN+ = –7dBFS 2kHz
fIN = 2kHz fIN = 2kHz Sine, IN– = –7dBFS 3.1kHz Sine
0 0 0
±10.24V RANGE ±10.24V RANGE ±10.24V RANGE
–20 TRUE BIPOLAR DRIVE (IN– = 0V) –20 FULLY DIFFERENTIAL DRIVE (IN– = –IN+) –20 ARBITRARY DRIVE
SNR = 96.3dB SNR = 96.4dB SFDR = 119dB
–40 –40 –40
THD = –110dB THD = –114dB SNR = 96.4dB
S) –60 SINAD = 96.2dB S) –60 SINAD = 96.3dB S) –60
BF SFDR = 113dB BF SFDR = 118dB BF
d d d
E ( –80 E ( –80 E ( –80
D D D
U U U
LIT –100 LIT –100 LIT –100 6.2kHz
P P P
M –120 M –120 M –120
A A A
–140 –140 –140
–160 –160 –160
–180 –180 –180
0 20 40 60 80 100 0 20 40 60 80 100 0 20 40 60 80 100
FREQUENCY (kHz) FREQUENCY (kHz) FREQUENCY (kHz)
235818 G10 235818 G11 235818 G12
32k Point FFT f = 200kHz, SNR, SINAD vs V , THD, Harmonics vs V ,
SMPL REFBUF REFBUF
f  = 2kHz f  = 2kHz f  = 2kHz
IN IN IN
0 100 –100
–20 TRUE BIPOLAR DR±I5V.E1 2(IVN R– A=N 0GVE) TRUE BIPO±L2A.5R •D VRRIVEFEB U(IFN R– A=N 0GVE) TRUE BIPO±L2A.5R •D VRRIVEFEB U(IFN R– A=N 0GVE)
–105
–40 SNR = 92.8dB 98
AMPLITUDE (dBFS) ––11––20860000 SITSNHFADDDR = = =– 911211.277dddBBB SNR, SINAD (dBFS) 9946 SNR SINAD D, HARMONICS (dBFS) –––111211050 2TNHDD
H
–140 92 T 3RD
–125
–160
–180 90 –130
0 20 40 60 80 100 2.5 3 3.5 4 4.5 5 2.5 3 3.5 4 4.5 5
FREQUENCY (kHz) REFBUF VOLTAGE (V) REFBUF VOLTAGE (V)
235818 G13 235818 G14 235818 G15
SNR, SINAD THD, Harmonics vs Input
vs Input Frequency TTHHDD vvss IInnppuutt FFrreeqquueennccyy Common Mode, fIN = 2kHz
100 –60 0
±10.24V RANGE
±10.24V RANGE
95 –70 TRUE BIPOLAR DRIVE (IN– = 0V) –20 2VP–P FULLY DIFFERENTIAL DRIVE
90 SNR S) –40
SNR, SINAD (dBFS) 77880505 SINAD THD (dBFS) ––11––10980000 TH1 SD0OkUΩRCE 1SkOΩURCE THD, HARMONICS (dBF ––11––20860000 –11V ≤ VCTMH D≤ 11V
50Ω SOURCE
65 ±10.24V RANGE –120 –140
TRUE BIPOLAR DRIVE (IN– = 0V) 3RD 2ND
60 –130 –160
10 100 1k 10k 100k 10 100 1k 10k 100k –15 –10 –5 0 5 10 15
FREQUENCY (Hz) FREQUENCY (Hz) INPUT COMMON MODE (V)
235818 G16 235818 G17 235818 G18
235818f
10
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