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LT1355 Datasheet(PDF) 1 Page - Linear Technology |
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LT1355 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 40 page  LTC2348-18 1 234818fa For more information www.linear.com/LTC2348-18 Typical applicaTion FeaTures DescripTion Octal, 18-Bit, 200ksps Differential ±10.24V Input SoftSpan ADC with Wide Input Common Mode Range The LTC®2348-18 is an 18-bit, low noise 8-channel si- multaneous sampling successive approximation register (SAR) ADC with differential, wide common mode range inputs. Operating from a 5V low voltage supply, flexible high voltage supplies, and using the internal reference 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 wide input common mode range and 118dB CMRR of the LTC2348-18 analog inputs allow the ADC to directly digitize a variety of signals, simplifying signal chain de- sign. This input signal flexibility, combined with ±3LSB INL, no missing codes at 18 bits, and 96.7dB SNR, makes the LTC2348-18 an ideal choice for many high voltage applications requiring wide dynamic range. The LTC2348-18 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 Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673. Other Patents pending. applicaTions n 200ksps per Channel Throughput n Eight Simultaneous Sampling Channels n ±3LSB INL (Maximum, ±10.24V Range) n Guaranteed 18-Bit, No Missing Codes n Differential, Wide Common Mode Range Inputs n Per-Channel SoftSpan Input Ranges: ±10.24V, 0V to 10.24V, ±5.12V, 0V to 5.12V ±12.5V, 0V to 12.5V, ±6.25V, 0V to 6.25V n 96.7dB Single-Conversion SNR (Typical) n −109dB THD (Typical) at fIN = 2kHz n 118dB CMRR (Typical) at fIN = 200Hz n Rail-to-Rail Input Overdrive Tolerance n Guaranteed Operation to 125°C n Integrated Reference and Buffer (4.096V) n SPI CMOS (1.8V to 5V) and LVDS Serial I/O n Internal Conversion Clock, No Cycle Latency n 140mW Power Dissipation (Typical) n 48-Lead (7mm x 7mm) LQFP Package n Programmable Logic Controllers n Industrial Process Control n Power Line Monitoring n Test and Measurement Integral Nonlinearity vs Output Code and Channel 0.1µF 2.2µF 0.1µF 0.1µF 1.8V TO 5V 5V 15V –15V SAMPLE CLOCK 234818 TA01a S/H S/H S/H S/H S/H S/H S/H S/H MUX VCC VDD VDDLBYP OVDD EIGHT SIMULTANEOUS SAMPLING CHANNELS DIFFERENTIAL INPUTS IN+/IN– WITH WIDE INPUT COMMON MODE RANGE +5V 0V –5V FULLY DIFFERENTIAL +10V 0V –10V TRUE BIPOLAR +10V 0V –10V ARBITRARY +10V 0V –10V UNIPOLAR SDO0 SDO7 SCKO SCKI SDI CS BUSY CNV LVDS/CMOS PD IN0+ IN0– IN7+ IN7– 18-BIT SAR ADC CMOS OR LVDS I/O INTERFACE 0.1µF REFIN 47µF 0.1µF GND REFBUF VEE LTC2348-18 TRUE BIPOLAR DRIVE (IN– = 0V) ALL CHANNELS ±10.24V RANGE OUTPUT CODE –131072 –65536 0 65536 131072 –2.0 –1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0 234818 TA01b |
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