LTC2488 16-Bit 2-/4-Channel S ADC with Easy Drive Input Current Cancellation FEATURES DESCRIPTION n Up to 2 Differential or 4 Single-Ended Inputs The LTC 2488 is a 4-channel (2-channel differential), n Easy Drive Technology Enables Rail-to-Rail Inputs 16-bit, No Latency S ADC with Easy Drive technology. with Zero Differential Input Current The patented sampling scheme eliminates dynamic input n Directly Digitizes High Impedance Sensors with current errors and the shortcomings of on-chip buffering Full Accuracy through automatic cancellation of differential input current. n 600nV RMS Noise (0.02LSB Transition Noise) This allows large external source impedances and rail-to- n GND to V Input/Reference Common Mode Range rail input signals to be directly digitized while maintaining CC n Simultaneous 50Hz/60Hz Rejection exceptional DC accuracy. n 2ppm INL, No Missing Codes The LTC2488 includes an integrated oscillator. This device n 1ppm Offset and 15ppm Full-Scale Error can be configured to measure an external signal from n No Latency: Digital Filter Settles in a Single Cycle, combinations of 4 analog input channels operating in single Even After a New Channel is Selected ended or differential modes. It automatically rejects line n Single Supply 2.7V to 5.5V Operation (0.8mW) frequencies of 50Hz and 60Hz simultaneously. n Internal Oscillator n The LTC2488 allows a wide common mode, input range Tiny 4mm 3mm DFN Package (0V to V ), independent of the reference voltage. Any CC combination of single-ended or differential inputs can APPLICATIONS be selected and the first conversion after a new channel selection is valid. n Direct Sensor Digitizer L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Direct Temperature Measurement No Latency S and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Instrumentation n Industrial Process Control TYPICAL APPLICATION Data Acquisition System Fullscale Error vs Source Resistance 80 2.7V TO 5.5V V = 5V CC V = 5V REF 60 + V = 3.75V 10F 0.1F IN V V = 1.25V CH0 CC IN 40 F = GND CH1 O T = 25C A 20 + C = 1F REF IN + SDI IN 0 4-CHANNEL SCK 16-BIT ADC 4-WIRE MUX 20 WITH EASY DRIVE SDO SPI INTERFACE CH2 IN CS 40 CH3 REF COM 60 F O 80 OSC 1 10 100 1k 10k 100k R () SOURCE 2488 TA01a 2488 TA01b 2488fb 1 For more information www.linear.com/LTC2488 +FS ERROR (ppm)LTC2488 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) Supply Voltage (V ) ................................... 0.3V to 6V CC F 1 14 REF Analog Input Voltage O + SDI 2 13 REF (CH0 to CH3, COM) ...................0.3V to (V + 0.3V) CC SCK 3 12 V CC + REF , REF ................................0.3V to (V + 0.3V) CC CS 4 15 11 CH3 Digital Input Voltage......................0.3V to (V + 0.3V) SDO 5 10 CH2 CC GND 6 9 CH1 Digital Output Voltage ...................0.3V to (V + 0.3V) CC COM 7 8 CH0 Operating Temperature Range DE PACKAGE LTC2488C ................................................ 0C to 70C 14-LEAD (4mm x 3mm) PLASTIC DFN LTC2488I .............................................40C to 85C T = 125C, = 37C/W JMAX JA EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range .................. 65C to 150C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2488CDE PBF LTC2488CDE TRPBF 2488 14-Lead (4mm 3mm) Plastic DFN 0C to 70C LTC2488IDE PBF LTC2488IDE TRPBF 2488 14-Lead (4mm 3mm) Plastic DFN 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: