LTC2358-18 - Buffered Octal, 18-Bit, 200ksps/Ch Differential ±10.24V ADC with 30VP-P Common PDF
Preview LTC2358-18 - Buffered Octal, 18-Bit, 200ksps/Ch Differential ±10.24V ADC with 30VP-P Common
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 235818f 1 For more information www.linear.com/LTC2358-18 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/ 235818f 2 For more information www.linear.com/LTC2358-18 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 235818f 3 For more information www.linear.com/LTC2358-18 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 235818f 4 For more information www.linear.com/LTC2358-18 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 235818f 5 For more information www.linear.com/LTC2358-18 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 235818f 6 For more information www.linear.com/LTC2358-18 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 235818f 7 For more information www.linear.com/LTC2358-18 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 For more information www.linear.com/LTC2358-18 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 For more information www.linear.com/LTC2358-18 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 For more information www.linear.com/LTC2358-18
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