Table Of Content

LTC2373-18 18-Bit, 1Msps, 8-Channel SAR ADC with 100dB SNR FeaTures DescripTion n 1Msps Throughput Rate The LTC®2373-18 is a low noise, high speed, 8-channel n 18-Bit Resolution with No Missing Codes 18-bit successive approximation register (SAR) ADC. Oper- n 8-Channel Multiplexer with Selectable Input Range ating from a single 5V supply, the LTC2373-18 has a highly n Fully Differential (±4.096V) configurable, low crosstalk 8-channel input multiplexer, n Pseudo-Differential Unipolar (0V to 4.096V) supporting fully differential, pseudo-differential unipolar n Pseudo-Differential Bipolar (±2.048V) and pseudo-differential bipolar analog input ranges. The n INL: ±2.75LSB (Maximum) LTC2373-18 achieves ±2.75LSB INL (maximum) in all n SNR: 100dB (Fully Differential)/95dB (Pseudo- input ranges, no missing codes at 18-bits and 100dB (fully Differential) (Typical) at fIN = 1kHz differential)/ 95dB (pseudo-differential) SNR (typical). n THD: –110dB (Typical) at f = 1kHz IN The LTC2373-18 has an onboard low drift (20ppm/°C max) n Programmable Sequencer 2.048V temperature-compensated reference and a single- n Selectable Digital Gain Compression shot capable reference buffer. The LTC2373-18 also has a n Single 5V Supply with 1.8V to 5V I/O Voltages high speed SPI-compatible serial interface that supports n SPI-Compatible Serial I/O 1.8V, 2.5V, 3.3V and 5V logic through which a sequencer n Onboard 2.048V Reference and Reference Buffer with a depth of 16 may be programmed. An internal os- n No Pipeline Delay, No Cycle Latency cillator sets the conversion time, easing external timing n Power Dissipation 40mW (Typical) considerations. The LTC2373-18 dissipates only 40mW n Guaranteed Operation to 125°C and automatically naps between conversions, leading to n 32-Lead 5mm × 5mm QFN Package reduced power dissipation that scales with the sampling applicaTions rate. A sleep mode is also provided to reduce the power consumption of the LTC2373-18 to 300μW for further n Programmable Logic Controllers power savings during inactive periods. n Industrial Process Control L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n High Speed Data Acquisition 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. n Portable or Compact Instrumentation n ATE Typical applicaTion Integral Nonlinearity vs Output Code 5V 4.096V 1.8V TO 5V 2.0 FULLY DIFFERENTIAL 0V 10µF 2.2µF 1.5 BIPOLAR UNIPOLAR 0V 0.1µF 1.0 4.0960VV + 10Ω 1200pF CCCHHH012 LTCV2D3D73-18 VDDLBYP OVDD RREDSELT ROR (LSB) 0.05 44..0099660VVV – 10Ω 1200pF CCCCCCOHHHHHM34567–MMUXOUTUX+MUXOUT +ADCIN–ADCIN REFB+–USFAM1PR8LE-IBNFIIGTN ADCGND BSCSSUDNCDSOKVIY SCALOMCPKLE INL ER –––011...505 0V 47µF 0.1µF 237318 TA01a –2.0 2.048V 0 65536 131072 196608 262144 OUTPUT CODE 2373 TA01b 237318f 1 For more information www.linear.com/LTC2373-18 LTC2373-18 absoluTe MaxiMuM raTings pin conFiguraTion (Notes 1, 2) Supply Voltage (V ) .................................................6V DD TOP VIEW Supply Voltage (OV ) ...............................................6V DD P A naClHog0 Itnop CuHt 7V,o CltOagMe .(..N..o..t.e( G3N)D – 0.3V) to (VDD + 0.3V) CH1 CH0 COM VDD VDDLBY GND GND OVDD 32 31 30 29 28 27 26 25 REFBUF .......................(GND – 0.3V) to (V + 0.3V) DD CH2 1 24 RESET REFIN ......................................................................2.8V CH3 2 23 GND Digital Input Voltage MUXOUT+ 3 22 SDO (Note 3) ...........................(GND –0.3V) to (OVDD + 0.3V) ADCIN+ 4 21 SCK 33 Digital Output Voltage ADCIN– 5 20 SDI (Note 3) ...........................(GND –0.3V) to (OV + 0.3V) MUXOUT– 6 19 BUSY DD Power Dissipation ..............................................500mW CH4 7 18 RDL CH5 8 17 GND Operating Temperature Range 9 10 11 12 13 14 15 16 LTC2373C ................................................0°C to 70°C 6 7 D F N D D V LTC2373I .............................................–40°C to 85°C CH CH GN EFBU REFI GN GN CN R LTC2373H ..........................................–40°C to 125°C Storage Temperature Range ..................–65°C to 150°C UH PACKAGE 32-LEAD (5mm × 5mm) PLASTIC QFN TJMAX = 125°C, θJA = 44°C/W EXPOSED PAD IS GND (PIN 33) MUST BE SOLDERED TO PCB orDer inForMaTion LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2373CUH-18#PBF LTC2373CUH-18#TRPBF 237318 32-Lead (5mm × 5mm) Plastic QFN 0°C to 70°C LTC2373IUH-18#PBF LTC2373IUH-18#TRPBF 237318 32-Lead (5mm × 5mm) Plastic QFN –40°C to 85°C LTC2373HUH-18#PBF LTC2373HUH-18#TRPBF 237318 32-Lead (5mm × 5mm) Plastic QFN –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. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 237318f 2 For more information www.linear.com/LTC2373-18 LTC2373-18 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. (Note 4) A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V + Absolute Input Range (CH0 to CH7) (Note 5) l –0.1 V + 0.1 V IN REFBUF V – Absolute Input Range Fully Differential (Note 5) l –0.1 V + 0.1 V IN REFBUF (CH0 to CH7, COM) Pseudo-Differential Unipolar (Note 5) l –0.1 0 0.1 V Pseudo-Differential Bipolar (Note 5) l V /2 – 0.1 V /2 V /2 + 0.1 V REFBUF REFBUF REFBUF V + – V – Input Differential Voltage Range Fully Differential l –V V V IN IN REFBUF REFBUF Pseudo-Differential Unipolar l 0 V V REFBUF Pseudo-Differential Bipolar l –V /2 V /2 V REFBUF REFBUF V Common Mode Input Range Pseudo-Differential Bipolar and CM Fully Differential (Note 6) l –V /2 – 0.1 V /2 V /2 + 0.1 V REFBUF REFBUF REFBUF I Analog Input Leakage Current l –1 1 µA IN C Analog Input Capacitance Sample Mode 75 pF IN Hold Mode 5 pF CMRR Input Common Mode Rejection Ratio Fully Differential, f = 500kHz 67 dB IN Pseudo-Differential Unipolar, f = 500kHz 66 dB IN Pseudo-Differential Bipolar, f = 500kHz 66 dB IN converTer characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. (Note 4) A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Resolution l 18 Bits No Missing Codes l 18 Bits Transition Noise Fully Differential 0.85 LSB RMS Pseudo-Differential Unipolar 1.5 LSB RMS Pseudo-Differential Bipolar 1.5 LSB RMS INL Integral Linearity Error Fully Differential (Note 7) l –2 ±0.5 2 LSB Pseudo-Differential Unipolar (Note 7) l –2.75 ±0.8 2.75 LSB Pseudo-Differential Bipolar (Note 7) l –2.75 ±0.8 2.75 LSB DNL Differential Linearity Error Fully Differential (Note 6) l –0.9 ±0.25 0.9 LSB Pseudo-Differential Unipolar (Note 6) l –0.9 ±0.25 0.9 LSB Pseudo-Differential Bipolar (Note 6) l –0.9 ±0.25 0.9 LSB ZSE Zero-Scale Error Fully Differential (Note 8) l –15 ±2 15 LSB Pseudo-Differential Unipolar (Note 8) l –30 ±2 30 LSB Pseudo-Differential Bipolar (Note 8) l –30 ±2 30 LSB Zero-Scale Error Drift Fully Differential 20 mLSB/°C Pseudo-Differential Unipolar 30 mLSB/°C Pseudo-Differential Bipolar 30 mLSB/°C Zero-Scale Error Match Fully Differential l –18 ±2 18 LSB Pseudo-Differential Unipolar l –24 ±4 24 LSB Pseudo-Differential Bipolar l –28 ±4 28 LSB FSE Full-Scale Error Fully Differential REFBUF = 4.096V (REFBUF Overdriven) (Notes 8, 9) l –50 ±7 50 LSB REFIN = 2.048V (REFIN Overdriven) (Note 8) l –100 ±11 100 LSB Pseudo-Differential Unipolar REFBUF = 4.096V (REFBUF Overdriven) (Notes 8, 9) l –75 ±5 75 LSB REFIN = 2.048V (REFIN Overdriven) (Note 8) l –200 ±14 200 LSB Pseudo-Differential Bipolar REFBUF = 4.096V (REFBUF Overdriven) (Notes 8, 9) l –50 ±8 50 LSB REFIN = 2.048V (REFIN Overdriven) (Note 8) l –120 ±12 120 LSB 237318f 3 For more information www.linear.com/LTC2373-18 LTC2373-18 converTer characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. (Note 4) A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Full-Scale Error Drift Fully Differential REFBUF = 4.096V (REFBUF Overdriven) (Note 9) 0.2 ppm/°C Pseudo-Differential Unipolar REFBUF = 4.096V (REFBUF Overdriven) (Note 9) 0.2 ppm/°C Pseudo-Differential Bipolar REFBUF = 4.096V (REFBUF Overdriven) (Note 9) 0.2 ppm/°C Full-Scale Error Match Fully Differential REFBUF = 4.096V (REFBUF Overdriven) (Note 9) l –18 ±2 18 LSB Pseudo-Differential Unipolar REFBUF = 4.096V (REFBUF Overdriven) (Note 9) l –24 ±4 24 LSB Pseudo-Differential Bipolar REFBUF = 4.096V (REFBUF Overdriven) (Note 9) l –28 ±4 28 LSB DynaMic accuracy The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C and A = –1dBFS. (Notes 4, 10) A IN SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS SINAD Signal-to-(Noise + Distortion) Ratio Fully Differential f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l 96 99.5 dB IN Pseudo-Differential Unipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l 90.5 94.8 dB IN Pseudo-Differential Bipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l 90.5 94.8 dB IN Fully Differential f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) 101.4 dB IN Pseudo-Differential Unipolar f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) 96.6 dB IN Pseudo-Differential Bipolar f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) 96.6 dB IN Fully Differential f = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1 98.4 dB IN Pseudo-Differential Bipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1 93.3 dB IN SNR Signal-to-Noise Ratio Fully Differential f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l 96.5 100 dB IN Pseudo-Differential Unipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l 91 95.0 dB IN Pseudo-Differential Bipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l 91 95.0 dB IN Fully Differential f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) 102 dB IN Pseudo-Differential Unipolar f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) 96.8 dB IN Pseudo-Differential Bipolar f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) 96.8 dB IN Fully Differential f = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1 98.5 dB IN Pseudo-Differential Bipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1 93.4 dB IN 237318f 4 For more information www.linear.com/LTC2373-18 LTC2373-18 DynaMic accuracy The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C and A = –1dBFS. (Notes 4, 10) A IN SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS THD Total Harmonic Distortion Fully Differential f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l –104 –114 dB IN Pseudo-Differential Unipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l –99 –110 dB IN Pseudo-Differential Bipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l –99 –110 dB IN Fully Differential f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) –111 dB IN Pseudo-Differential Unipolar f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) –110 dB IN Pseudo-Differential Bipolar f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) –110 dB IN Fully Differential f = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1 –113 dB IN Pseudo-Differential Bipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1 –110 dB IN SFDR Spurious Free Dynamic Range Fully Differential f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l 104 114 dB IN Pseudo-Differential Unipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l 99 110 dB IN Pseudo-Differential Bipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven) l 99 110 dB IN Fully Differential f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) 112 dB IN Pseudo-Differential Unipolar f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) 112 dB IN Pseudo-Differential Bipolar f = 1kHz, REFBUF = 5V (REFBUF Overdriven) (Note 9) 112 dB IN Fully Differential f = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1 112.5 dB IN Pseudo-Differential Bipolar f = 1kHz, REFIN = 2.048V (REFIN Overdriven), SEL = 1 113.5 dB IN Channel-to-Channel Crosstalk f = 100kHz, Signal Applied to an OFF Channel –107 dB IN –3dB Input Linear Bandwidth 22 MHz Aperture Delay 500 ps Aperture Jitter 4 ps RMS Transient Response Full-Scale Step 460 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 4) A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Internal Reference Output Voltage 2.043 2.048 2.053 V REFIN V Temperature Coefficient (Note 11) l 4 20 ppm/°C REFIN REFIN Output Impedance 15 kΩ V Line Regulation V = 4.75V to 5.25V 0.06 mV/V REFIN DD REFIN Input Voltage Range (REFIN Overdriven) (Note 5) 1.25 2.4 V 237318f 5 For more information www.linear.com/LTC2373-18 LTC2373-18 reFerence buFFer characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. (Note 4) A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Reference Buffer Output Voltage V = 2.048V l 4.088 4.096 4.104 V REFBUF REFIN REFBUF Input Voltage Range (REFBUF Overdriven) (Notes 5, 9) l 2.5 5 V REFBUF Output Impedance V = 0V (Buffer Disabled) 13 kΩ REFIN I REFBUF Load Current V = 5V (REFBUF Overdriven) (Notes 9, 12) l 1.1 1.5 mA REFBUF REFBUF V = 5V, Nap Mode (REFBUF Overdriven) (Note 9) 0.38 mA REFBUF 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 4) A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 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 O DD V Low Level Output Voltage I = 500µA l 0.2 V OL O I Hi-Z Output Leakage Current V = 0V to OV l –10 10 µA OZ OUT DD I Output Source Current V = 0V –10 mA SOURCE OUT I Output Sink Current V = OV 10 mA SINK 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 4) A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Supply Voltage l 4.75 5 5.25 V DD OV Supply Voltage l 1.71 5.25 V DD I Supply Current 1Msps Sample Rate l 8.0 11 mA VDD I Supply Current 1Msps Sample Rate (C = 20pF) l 0.7 mA OVDD L I Nap Mode Current Conversion Done (I + I ) l 1.25 1.5 mA NAP VDD OVDD I Sleep Mode Current Sleep Mode (I + I ) l 60 120 μA SLEEP VDD OVDD P Power Dissipation 1Msps Sample Rate 40 55 mW D Nap Mode Conversion Done (I + I ) 6.25 7.5 mW VDD OVDD Sleep Mode Sleep Mode (I + I ) 300 600 µW VDD OVDD aDc TiMing characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. (Note 4) A SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS f Maximum Sampling Frequency l 1 Msps SMPL t Conversion Time l 460 527 ns CONV t Acquisition Time t = t – t – t (Note 6) l 460 ns ACQ ACQ CYC CONV BUSYLH t Time Between Conversions l 1 µs CYC t CNV High Time l 20 ns CNVH t Minimum Low Time for CNV (Note 14) l 20 ns CNVL tBUSYLH CNV↑ to BUSY↑ Delay CL = 20pF l 13 ns t RESET Pulse Width l 200 ns RESETH tQUIET SCK, SDI and RDL Quiet Time from CNV↑ (Note 6) l 20 ns 237318f 6 For more information www.linear.com/LTC2373-18 LTC2373-18 elecTrical characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25°C. (Note 4) A t SCK Period (Notes 13, 14) l 10 ns SCK t SCK High Time l 4 ns SCKH t SCK Low Time l 4 ns SCKL tSSDISCK SDI Setup Time From SCK↑ (Note 13) l 4 ns tHSDISCK SDI Hold Time From SCK↑ (Note 13) l 1 ns tDSDO SDO Data Valid Delay from SCK↑ CL = 20pF, OVDD = 5.25V l 7.5 ns C = 20pF, OV = 2.5V l 8 ns L DD C = 20pF, OV = 1.71V l 9.5 ns L DD tHSDO SDO Data Remains Valid Delay from SCK↑ CL = 20pF (Note 6) l 1 ns tDSDOBUSYL SDO Data Valid Delay from BUSY↓ CL = 20pF (Note 6) l 5 ns tEN Bus Enable Time After RDL↓ (Note 13) l 16 ns tDIS Bus Relinquish Time After RDL↑ (Note 13) l 13 ns t REFBUF Wake-Up Time C = 47μF, C = 0.1µF 200 ms WAKE REFBUF REFIN tCNVMRST CNV↑ to MUX Starts Resetting Delay l 38 ns t MUX Reset Time During Conversion l 36 ns MRST1 tVLDMRST 8th SCK↑ to MUX Starts Resetting Delay After l 40 ns Programming 1st Valid Configuration Word t MUX Reset Time During Acquisition After l 42 ns MRST2 Programming 1st Valid Configuration Word Note 1: Stresses beyond those listed under Absolute Maximum Ratings 0.5LSB when the output code flickers between 00 0000 0000 0000 0000 may cause permanent damage to the device. Exposure to any Absolute and 00 0000 0000 0000 0001. Bipolar zero-scale error is the offset volt- Maximum Rating condition for extended periods may affect device age measured from –0.5LSB when the output code flickers between 00 reliability and lifetime. 0000 0000 0000 0000 and 11 1111 1111 1111 1111. Fully differential full- Note 2: All voltage values are with respect to ground. scale error is the worst-case deviation of the first and last code transitions from ideal and includes the effect of offset error. Unipolar full-scale error Note 3: When these pin voltages are taken below ground or above V or DD is the deviation of the last code transition from the ideal and includes the OV , they will be clamped by internal diodes. This product can handle DD effect of offset error. Bipolar full-scale error is the worst-case deviation input currents up to 100mA below ground or above V or OV without DD DD of the first and last code transitions from ideal and includes the effect of latchup. offset error. Note 4: V = 5V, OV = 2.5V, f = 1MHz, REFIN = 2.048V unless DD DD SMPL Note 9: When REFBUF is overdriven, the internal reference buffer must be otherwise noted. turned off by setting REFIN=0V. Note 5: Recommended operating conditions. Note 10: All specifications in dB are referred to a full-scale ±V (fully Note 6: Guaranteed by design, not subject to test. REFBUF differential), 0V to V (pseudo-differential unipolar), or ±V /2 REFBUF REFBUF Note 7: Integral nonlinearity is defined as the deviation of a code from a (pseudo-differential bipolar) input. straight line passing through the actual endpoints of the transfer curve. Note 11: Temperature coefficient is calculated by dividing the maximum The deviation is measured from the center of the quantization band. change in output voltage by the specified temperature range. Note 8: Fully differential zero-scale error is the offset voltage measured Note 12: f = 1MHz, I varies proportionally with sample rate. from –0.5LSB when the output code flickers between 01 1111 1111 1111 SMPL REFBUF Note 13: Parameter tested and guaranteed at OV = 1.71V, OV = 2.5V 1111 and 10 0000 0000 0000 0000 in straight binary format and 00 0000 DD DD and OV = 5.25V. 0000 0000 0000 and 11 1111 1111 1111 1111 in two’s complement DD format. Unipolar zero-scale error is the offset voltage measured from Note 14: tSCK of 10ns maximum allows a shift clock frequency up to 100MHz for rising edge capture. 0.8 • OVDD tWIDTH 0.2 • OVDD tDELAY tDELAY 50% 50% 0.8 • OVDD 0.8 • OVDD 237318 F01 0.2 • OVDD 0.2 • OVDD Figure 1. Voltage Levels for Timing Specifications 237318f 7 For more information www.linear.com/LTC2373-18 LTC2373-18 Typical perForMance characTerisTics T = 25°C, V = 5V, OV = 2.5V, REFIN = 2.048V, A DD DD Fully Differential Range, V = 2.048V, f = 1Msps, unless otherwise noted. CM SMPL Integral Nonlinearity Differential Nonlinearity vs Output Code vs Output Code DC Histogram (Zero-Scale) 2.0 1.0 140000 0.8 σ = 0.85 1.5 120000 0.6 1.0 0.4 100000 R (LSB) 0.5 R (LSB) 0.2 TS80000 O 0 O 0 N R R U NL ER–0.5 NL ER–0.2 CO60000 I D–0.4 40000 –1.0 –0.6 –1.5 20000 –0.8 –2.0 –1.0 0 0 65536 131072 196608 262144 0 65536 131072 196608 262144 –4 –3 –2 –1 0 1 2 3 4 OUTPUT CODE OUTPUT CODE CODE 237318 G01 237318 G02 237318 G03 32k Point FFT f = 1Msps, 32k Point FFT f = 1Msps, SMPL SMPL DC Histogram (Near Full-Scale) f = 1kHz f = 1kHz, REFBUF = 5V IN IN 120000 0 0 SNR = 100.7dB SNR = 102.3dB σ = 1.00 –20 THD = –114dB –20 THD = –111.5dB 100000 SINAD = 100.5dB SINAD = 101.8dB –40 SFDR = 115.3dB –40 SFDR = 111.9dB 80000 S) –60 S) –60 F F B B COUNTS60000 LITUDE (d –1–0800 LITUDE (d –1–0800 P P 40000 M –120 M –120 A A –140 –140 20000 –160 –160 0 –180 –180 131052 131054 131056 131058 131060 0 100 200 300 400 500 0 100 200 300 400 500 CODE FREQUENCY (kHz) FREQUENCY (kHz) 237318 G04 237318 G05 237318 G06 THD, Harmonics vs REFBUF, SNR, SINAD vs Input Level, SNR, SINAD vs REFBUF, f = 1kHz f = 1kHz f = 1kHz IN IN IN 103 –105 101.0 102 SNR –110 SNR SNR, SINAD (dBFS)1190099108 SINAD D, HARMONICS (dBFS)––112105 THD 3RD SNR, SINAD (dBFS)110000..50 SINAD TH 99.5 –125 97 2ND 96 –130 99.0 2.5 3 3.5 4 4.5 5 2.5 3 3.5 4 4.5 5 –40 –30 –20 –10 0 REFBUF VOLTAGE (V) REFBUF VOLTAGE (V) INPUT LEVEL (dB) 237318 G07 237318 G08 237318 G09 237318f 8 For more information www.linear.com/LTC2373-18 LTC2373-18 Typical perForMance characTerisTics T = 25°C, V = 5V, OV = 2.5V, REFIN = 2.048V, A DD DD Fully Differential Range, V = 2.048V, f = 1Msps, unless otherwise noted. CM SMPL THD, Harmonics vs Input SNR, SINAD vs Input Frequency Frequency CMRR vs Input Frequency 105 –70 80 100 –80 75 SNR SINAD (dBFS) 989055 SINAD RMONICS (dBFS)––19000 MRR (dB) 7605 SNR, 80 D, HA–110 C 60 H T 75 –120 THD 55 2ND 3RD 70 –130 50 0 25 50 75 100 125 150 175 200 0 25 50 75 100 125 150 175 200 0 100 200 300 400 500 FREQUENCY (kHz) FREQUENCY (kHz) FREQUENCY (kHz) 237318 G10 237318 G11 237318 G12 SNR, SINAD vs Temperature, THD, Harmonics vs Temperature, PSRR vs Frequency f = 1kHz f = 1kHz IN IN 95 102 –110 90 THD 101 85 SNR S)–115 SRR (dB) 877005 SINAD (dBFS) 10909 SINAD RMONICS (dBF–120 3RD P 6650 SNR, 98 D, HA 2ND H–125 T 55 97 50 45 96 –130 1 10 100 1k –40–25–10 5 20 35 50 65 80 95 110125 –40–25–10 5 20 35 50 65 80 95 110125 FREQUENCY (kHz) TEMPERATURE (°C) TEMPERATURE (°C) 237318 G13 237318 G14 237318 G15 Full-Scale Error vs Temperature INL vs Temperature REFBUF = 4.096V Zero-Scale Error vs Temperature 2 4 2.0 3 1.5 –FS 1 B) 2 1.0 INL ERROR (LSB) 0 MMAIXN IINNLL L-SCALE ERROR (LS –011 +FS FFSET ERROR (LSB)–00..055 –1 UL –2 O–1.0 F –3 –1.5 –2 –4 –2.0 –40–25–10 5 20 35 50 65 80 95 110125 –40–25–10 5 20 35 50 65 80 95 110125 –40–25–10 5 20 35 50 65 80 95 110125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 237318 G16 237318 G17 237318 G18 237318f 9 For more information www.linear.com/LTC2373-18 LTC2373-18 Typical perForMance characTerisTics T = 25°C, V = 5V, OV = 2.5V, REFIN = 2.048V, A DD DD Pseudo-Differential Unipolar Range, f = 1Msps, unless otherwise noted. SMPL Integral Nonlinearity vs Output Differential Nonlinearity vs Code Output Code DC Histogram (Zero-Scale) 2.0 1.0 80000 σ = 1.54 0.8 1.5 0.6 1.0 60000 0.4 NL ERROR (LSB)–00..055 NL ERROR (LSB)–00..022 COUNTS40000 I D–0.4 –1.0 20000 –0.6 –1.5 –0.8 –2.0 –1.0 0 0 65536 131072 196608 262144 0 65536 131072 196608 262144 4 6 8 10 12 14 16 18 20 OUTPUT CODE OUTPUT CODE CODE 237318 G19 237318 G20 237318 G21 32k Point FFT fSMPL = 1Msps, 32k Point FFT fSMPL = 1Msps, DC Histogram (Near Full-Scale) fIN = 1kHz fIN = 1kHz, REFBUF = 5V 60000 0 0 σ = 1.89 SNR = 95.1dB SNR = 96.9dB –20 THD = –110dB –20 THD = –111dB SINAD = 94.9dB SINAD = 96.7dB –40 SFDR = 113.3dB –40 SFDR = 112.8dB 40000 S) –60 S) –60 F F B B COUNTS LITUDE (d –1–0800 LITUDE (d –1–0800 P P 20000 M –120 M –120 A A –140 –140 –160 –160 0 –180 –180 262122 262128 262134 262140 0 100 200 300 400 500 0 100 200 300 400 500 CODE FREQUENCY (kHz) FREQUENCY (kHz) 237318 G22 237318 G23 237318 G24 THD, Harmonics vs REFBUF, SNR, SINAD vs Input Level, SNR, SINAD vs REFBUF, f = 1kHz f = 1kHz f = 1kHz IN IN IN 98 –105 96.0 97 THD SNR –110 96 S) 95.5 SNR, SINAD (dBFS) 999453 SINAD D, HARMONICS (dBF––112105 32RNDD SNR, SINAD (dBFS)95.0 SNRSINAD 92 TH 94.5 –125 91 90 –130 94.0 2.5 3 3.5 4 4.5 5 2.5 3 3.5 4 4.5 5 –40 –30 –20 –10 0 REFBUF VOLTAGE (V) REFBUF VOLTAGE (V) INPUT LEVEL (dB) 237318 G25 237318 G26 237318 G27 237318f 10 For more information www.linear.com/LTC2373-18

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18-Bit, 1Msps, 8-Channel SAR ADC with 100dB SNR applicaTions LTC2373HUH-18#PBF LTC2373HUH-18#TRPBF 237318 32-Lead (5mm × 5mm) Plastic QFN –40°C to 125°C

18-Bit, 1Msps, 8-Channel SAR ADC with - Linear Technology PDF

50 Pages·2015·1.88 MB·English

by Linear Technology Corporation

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by Linear Technology Corporation| 2015| 50 pages| 1.88| English

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18-Bit, 1Msps, 8-Channel SAR ADC with 100dB SNR applicaTions LTC2373HUH-18#PBF LTC2373HUH-18#TRPBF 237318 32-Lead (5mm × 5mm) Plastic QFN –40°C to 125°C

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Author:	Linear Technology Corporation
Publication Year:	2015
Pages:	50
Language:	English
File Size:	1.88
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