LTC2495 16-Bit 8-/16-Channel DS ADC with PGA, Easy Drive 2 and I C Interface Features Description n Up to Eight Differential or 16 Single-Ended Inputs The LTC 2495 is a 16-channel (eight differential), 16-bit, TM TM n Easy Drive Technology Enables Rail-to-Rail No Latency DS ADC with Easy Drive technology and a 2 Inputs with Zero Differential Input Current 2-wire, I C interface. The patented sampling scheme elim- n Directly Digitizes High Impedance Sensors with inates dynamic input current errors and the shortcomings Full Accuracy of on-chip buffering through automatic cancellation of 2 n 2-Wire I C Interface with 27 Addresses Plus One differential input current. This allows large external source Global Address for Synchronization impedances and rail-to-rail input signals to be directly n 600nV RMS Noise digitized while maintaining exceptional DC accuracy. n Programmable Gain from 1 to 256 The LTC2495 includes programmable gain, a high accuracy n Integrated High Accuracy Temperature Sensor temperature sensor, and an integrated oscillator. This device n GND to V Input/Reference Common Mode Range CC can be configured to measure an external signal (from com - n Programmable 50Hz, 60Hz, or Simultaneous binations of 16 analog input channels operating in single- 50Hz/60Hz Rejection Mode ended or differential modes) or its internal temperature n 2ppm INL, No Missing Codes sensor. The integrated temperature sensor offers 1/2C n 1ppm Offset and 15ppm Full-Scale Error resolution and 2C absolute accuracy. The LTC2495 can n 2x Speed/Reduced Power Mode (15Hz Using Internal be configured to provide a programmable gain from 1 to Oscillator and 80A at 7.5Hz Output) 256 in 8 steps. n No Latency: Digital Filter Settles in a Single Cycle, The LTC2495 allows a wide common mode input range Even After a New Channel is Selected n (0V to V ), independent of the reference voltage. Any Single Supply 2.7V to 5.5V Operation (0.8mW) CC n combination of single-ended or differential inputs can Internal Oscillator n be selected and the first conversion, after a new channel Tiny 5mm 7mm QFN Package is selected, is valid. Access to the multiplexer output en- a ables optional external amplifiers to be shared between all analog inputs and auto calibration continuously removes n Direct Sensor Digitizer their associated offset and drift. n Direct Temperature Measurement L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and n Instrumentation No Latency DS and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n Industrial Process Control t ypical a Built-In High Performance Temperature Sensor 5 Data Acquisition System with Temperature Compensation 4 2.7V TO 5.5V 3 CH0 MUXOUT/ V CC 0.1F 10F 2 ADCIN CH1 1 + REF + IN 0 1.7k CH7 16-CHANNEL 16-BIT ADC CH8 MUX 1 SDA WITH EASY DRIVE 2-WIRE 2 I C INTERFACE 2 IN SCL CH15 REF 3 COM f 4 O TEMPERATURE MUXOUT/ OSC 5 SENSOR ADCIN 55 30 5 20 45 70 95 120 2495 TA01 TEMPERATURE (C) 2495 TA02 2495fe 1 For more information www.linear.com/LTC2495 ABSOLUTE ERROR (C) pplication pplicationsLTC2495 a bsolute Maxi Mu M r p in c F (Notes 1, 2) TOP VIEW Supply Voltage (V ) ................................... 0.3V to 6V CC Analog Input Voltage 38 37 36 35 34 33 32 (CH0-CH15, COM) .....................0.3V to (V + 0.3V) CC GND 1 31 GND + SCL 2 30 REF REF , REF ...............................0.3V to (V + 0.3V) CC + SDA 3 29 REF ADCINN, ADCINP, MUXOUTP, GND V 4 28 CC MUXOUTN ................................0.3V to (V + 0.3V) CC NC MUXOUTN 5 27 Digital Input Voltage......................0.3V to (V + 0.3V) GND ADCINN 6 26 CC 39 COM 7 25 ADCINP Digital Output Voltage ...................0.3V to (V + 0.3V) CC CH0 MUXOUTP 8 24 Operating Temperature Range CH1 9 23 CH15 LTC2495C ................................................ 0C to 70C CH2 10 22 CH14 CH3 11 21 CH13 LTC2495I .............................................40C to 85C CH4 12 20 CH12 Storage Temperature Range ..................65C to 150C 13 14 15 16 17 18 19 UHF PACKAGE 38-LEAD (5mm 7mm) PLASTIC QFN T = 125C, = 34C/W JMAX JA EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB Der in F M LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2495CUHF PBF LTC2495CUHF TRPBF 2495 0C to 70C 38-Lead (5mm 7mm) Plastic QFN LTC2495IUHF PBF LTC2495IUHF TRPBF 2495 38-Lead (5mm 7mm) Plastic QFN 40C to 85C 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 non-standard lead based finish parts. For more information on lead free part marking, go to: