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LTC2756 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2756 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 40 page  LTC2345-18 1 234518f For more information www.linear.com/LTC2345-18 Typical applicaTion FeaTures DescripTion Octal, 18-Bit, 200ksps Differential SoftSpan ADC with Wide Input Common Mode Range The LTC®2345-18 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 and us- ing the internal reference and buffer, each channel of this SoftSpanTM ADC can be independently configured on a conversion-by-conversion basis to accept ±4.096, 0V to 4.096V, ±2.048V, or 0V to 2.048V signals. Individual channels may also be disabled to increase throughput on the remaining channels. The wide input common mode range and 102dB CMRR of the LTC2345-18 analog inputs allow the ADC to directly digitizeavarietyofsignals,simplifyingsignalchaindesign. This input signal flexibility, combined with ±5LSB INL, no missing codes at 18 bits, and 91.8dB SNR, makes the LTC2345-18 an ideal choice for many applications requir- ing wide dynamic range. The LTC2345-18 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 ±5LSB INL (Maximum, ±4.096V Range) n Guaranteed 18-Bit, No Missing Codes n Differential, Wide Common Mode Range Inputs n Per-Channel SoftSpan Input Ranges: ±4.096V, 0V to 4.096V, ±2.048V, 0V to 2.048V ±5V, 0V to 5V, ±2.5V, 0V to 2.5V n 91.8dB Single-Conversion SNR (Typical) n −113dB THD (Typical) at fIN = 2kHz n 102dB 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 81mW Power Dissipation (Typical) n 48-Lead (7mm x 7mm) QFN Package n Programmable Logic Controllers n Industrial Process Control n Medical Imaging n High Speed Data Acquisition Integral Nonlinearity vs Output Code and Channel ±4.096V RANGE FULLY DIFFERENTIAL DRIVE (IN– = –IN+) ALL CHANNELS OUTPUT CODE –131072 –65536 0 65536 131072 –2.0 –1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0 234518 TA01b 0.1µF 2.2µF 0.1µF 1.8V TO 5V 5V SAMPLE CLOCK 234518 TA01a S/H S/H S/H S/H S/H S/H S/H S/H MUX VDD VDDLBYP OVDD EIGHT SIMULTANEOUS SAMPLING CHANNELS DIFFERENTIAL INPUTS IN+/IN– WITH WIDE INPUT COMMON MODE RANGE 5V 0V FULLY DIFFERENTIAL 5V 0V BIPOLAR 5V 0V ARBITRARY 5V 0V 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 GND REFBUF LTC2345-18 |
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