LTC 2326-18 18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential Input ADC with 95dB SNR
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LTC 2326-18  18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential  Input ADC with 95dB SNR - 1

LTC2326-18 18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential Input ADC with 95dB SNR Features 250ksps Throughput Rate n ±5LSB INL (Max) n Guaranteed 18-Bit No Missing Codes n Pseudo-Differential Inputs n True Bipolar Input Ranges ±6.25V, ±10.24V, ±12.5V n 95dB SNR (Typ) at f = 2kHz IN n –111dB THD (Typ) at f = 2kHz IN n Guaranteed Operation to 125°C n Single 5V Supply n Low Drift (20ppm/°C Max) 2.048V Internal Reference n Onboard Single-Shot Capable Reference Buffer n No Pipeline Delay, No Cycle Latency n 1.8V to 5V I/O Voltages n SPI-Compatible Serial I/O with Daisy-Chain Mode n Internal Conversion Clock n Power Dissipation 28mW (Typ) n 16-Lead MSOP Package The LTC®2326-18 is a low noise, high speed 18-bit successive approximation register (SAR) ADC with pseudodifferential inputs. Operating from a single 5V supply, the LTC2326-18 has a ±10.24V true bipolar input range, making it ideal for high voltage applications which require a wide dynamic range. The LTC2326-18 achieves ±5LSB INL maximum, no missing codes at 18 bits with 95dB SNR. Programmable Logic Controllers Industrial Process Control High Speed Data Acquisition Portable or Compact Instrumentation ATE The LTC2326-18 has an onboard single-shot capable reference buffer and low drift (20ppm/°C max) 2.048V temperature compensated reference. The LTC2326-18 also has a high speed SPI-compatible serial interface that supports 1.8V, 2.5V, 3.3V and 5V logic while also featuring a daisy-chain mode. The fast 250ksps throughput with no cycle latency makes the LTC2326-18 ideally suited for a wide variety of high speed applications. An internal oscillator sets the conversion time, easing external timing considerations. The LTC2326-18 dissipates only 28mW and automatically naps between conversions, leading to reduced power dissipation that scales with the sampling rate. A sleep mode is also provided to reduce the power consumption of the LTC2326-18 to 300μW for further power savings during inactive periods. 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. Typical Application VDDLBYP OVDD CHAIN RDL/SDI SDO SCK BUSY CNV AMPLITUDE (dBFS) SAMPLE CLOCK

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LTC 2326-18  18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential  Input ADC with 95dB SNR - 2

LTC2326-18 Absolute Maximum Ratings VDDLBYP VDD GND IN+ IN– GND REFBUF REFIN GND OVDD SDO SCK RDL/SDI BUSY CHAIN CNV MS PACKAGE 16-LEAD PLASTIC MSOP TJMAX = 150°C, θJA = 110°C/W Order Information LEAD FREE FINISH PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE 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...

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LTC 2326-18  18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential  Input ADC with 95dB SNR - 3

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4) SYMBOL Absolute Input Range (IN+) Absolute Input Range (IN–) Input Differential Voltage Range Analog Input Current Analog Input Capacitance Analog Input Resistance Input Common Mode Rejection Ratio Converter Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4) SYMBOL Integral Linearity Error Differential Linearity Error Bipolar Zero-Scale Error VREFBUF...

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LTC 2326-18  18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential  Input ADC with 95dB SNR - 4

LTC2326-18 Internal Reference Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4) SYMBOL Internal Reference Output Voltage VREFIN Temperature Coefficient REFIN Output Impedance VREFIN Line Regulation REFIN Input Voltage Range (REFIN Overdriven) (Note 5) Reference Buffer Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4) SYMBOL Reference Buffer Output Voltage REFBUF Input Voltage Range...

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LTC 2326-18  18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential  Input ADC with 95dB SNR - 5

The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. (Note 4) SYMBOL fSMPL tCONV tACQ tHOLD tCYC tCNVH tBUSYLH tCNVL tQUIET tSCK tSCKH tSCKL tSSDISCK tHSDISCK PARAMETER Maximum Sampling Frequency Conversion Time Acquisition Time Maximum Time between Acquisitions Time Between Conversions CNV High Time CNV↑ to BUSY Delay Minimum Low Time for CNV tACQ = tCYC – tHOLD (Note 11) SCK Quiet Time from CNV↑ SCK Period SCK High Time SCK Low Time SDI Setup Time From SCK↑ SDI Hold Time From SCK↑ SCK Period in Chain Mode SDO...

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LTC 2326-18  18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential  Input ADC with 95dB SNR - 6

LTC2326-18 Typical Performance Characteristics fSMPL = 250ksps, unless otherwise noted. Differential Nonlinearity vs Output Code THD, Harmonics vs Input Frequency AMPLITUDE (dBFS) SNR, SINAD vs Input Frequency Integral Nonlinearity vs Output Code

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LTC 2326-18  18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential  Input ADC with 95dB SNR - 7

LTC2326-18 Typical Performance Characteristics fSMPL = 250ksps, unless otherwise noted. SNR, SINAD vs Input Level, fIN = 2kHz MAGNITUDE (dBFS) Full-Scale Error vs Temperature Offset Error vs Temperature

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LTC 2326-18  18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential  Input ADC with 95dB SNR - 8

LTC2326-18 Typical Performance Characteristics fSMPL = 250ksps, unless otherwise noted. Supply Current vs Temperature 2.0484 INTERNAL REFERENCE OUTPUT (V) Internal Reference Output vs Temperature Sleep Current vs Temperature Internal Reference Output Temperature Coefficient Distribution CMRR vs Input Frequency Supply Current vs Sampling Rate 12

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LTC 2326-18  18-Bit, 250ksps, ±10.24V True Bipolar, Pseudo-Differential  Input ADC with 95dB SNR - 9

LTC2326-18 Pin Functions VDDLBYP (Pin 1): 2.5V Supply Bypass Pin. The voltage on this pin is generated via an onboard regulator off of VDD. This pin must be bypassed with a 2.2μF ceramic capacitor to GND. VDD (Pin 2): 5V Power Supply. The range of VDD is 4.75V to 5.25V. Bypass VDD to GND with a 10µF ceramic capacitor. GND (Pins 3, 6 and 16): Ground. IN+ (Pin 4): Analog Input. IN+ operates differential with respect to IN– with an IN+-IN– range of –2.5 • VREFBUF to 2.5 • VREFBUF. IN– (Pin 5): Analog Ground Sense. IN– has an input range of ±500mV with respect to GND and must be tied to the...

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