LTC2373-18 18-Bit, 1Msps, 8-Channel SAR ADC with 100dB SNR Fea T Descrip T 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 f = 1kHz IN 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 125C and automatically naps between conversions, leading to n 32-Lead 5mm 5mm QFN Package reduced power dissipation that scales with the sampling rate. A sleep mode is also provided to reduce the power a T consumption of the LTC2373-18 to 300W 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 SoftSpan is a trademark of Linear Technology Corporation. All other trademarks are the property High Speed Data Acquisition of their respective owners. Protected by U.S. Patents, including 7705765, 7961132, 8319673. n Portable or Compact Instrumentation n ATE Integral Nonlinearity Typical a T vs Output Code 5V 2.0 4.096V 1.8V TO 5V FULLY DIFFERENTIAL BIPOLAR 0V 1.5 10F 2.2F UNIPOLAR 0.1F 0V 1.0 10 V V OV DD DDLBYP DD 0.5 4.096V CH0 RESET + CH1 LTC2373-18 1200pF RDL 0V 0 CH2 + CH3 4.096V MUX 18-BIT SDO 1200pF 10 0.5 CH4 SAMPLING ADC SCK 0V CH5 SDI 1.0 CH6 BUSY SAMPLE CH7 4.096V CNV 1.5 CLOCK COM REFBUF REFIN GND 0V 237318 TA01a 47F 0.1F 2.0 0 65536 131072 196608 262144 2.048V OUTPUT CODE 2373 TA01b 237318f 1 For more information www.linear.com/LTC2373-18 MUXOUT + MUXOUT + ADCIN ADCIN INL ERROR (LSB) ion pplica ions pplica ion uresLTC2373-18 a Te Maxi Mu M r a T p c F T (Notes 1, 2) Supply Voltage (V ) ................................................. 6V TOP VIEW DD Supply Voltage (OV ) ............................................... 6V DD Analog Input Voltage (Note 3) CH0 to CH7, COM ........ (GND 0.3V) to (V + 0.3V) DD 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 SDO 3 22 + ADCIN 4 21 SCK (Note 3) ...........................(GND 0.3V) to (OV + 0.3V) DD 33 ADCIN 5 20 SDI Digital Output Voltage MUXOUT 6 19 BUSY (Note 3) ...........................(GND 0.3V) to (OV + 0.3V) DD CH4 7 18 RDL Power Dissipation .............................................. 500mW CH5 8 17 GND Operating Temperature Range 9 10 11 12 13 14 15 16 LTC2373C ................................................0C to 70C LTC2373I .............................................40C to 85C LTC2373H ..........................................40C to 125C UH PACKAGE Storage Temperature Range ..................65C to 150C 32-LEAD (5mm 5mm) PLASTIC QFN T = 125C, = 44C/W JMAX JA EXPOSED PAD IS GND (PIN 33) MUST BE SOLDERED TO PCB o r D i n F Ma T 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 0C to 70C LTC2373IUH-18 PBF LTC2373IUH-18 TRPBF 237318 32-Lead (5mm 5mm) Plastic QFN 40C to 85C LTC2373HUH-18 PBF LTC2373HUH-18 TRPBF 237318 32-Lead (5mm 5mm) Plastic QFN 40C to 125C 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: