LTC2499 24-Bit 8-/16-Channel DS ADC with Easy Drive Input Current 2 Cancellation and I C Interface Features Description n The LTC 2499 is a 16-channel (eight differential), 24-bit, Up to Eight Differential or 16 Single-Ended Inputs n No Latency DS ADC with Easy Drive technology and a Easy Drive Technology Enables Rail-to-Rail 2 2-wire, I C interface. The patented sampling scheme elimi- Inputs with Zero Differential Input Current n nates dynamic input current errors and the shortcomings Directly Digitizes High Impedance Sensors with of on-chip buffering through automatic cancellation of Full Accuracy 2 n differential input current. This allows large external source 2-Wire I C Interface with 27 Addresses Plus One impedances and rail-to-rail input signals to be directly Global Address for Synchronization n digitized while maintaining exceptional DC accuracy. 600nV RMS Noise n Integrated High Accuracy Temperature Sensor The LTC2499 includes a high accuracy, temperature n GND to V Input/Reference Common Mode Range CC sensor and an integrated oscillator. This device can be n Programmable 50Hz, 60Hz or Simultaneous configured to measure an external signal (from combi - 50Hz/60Hz Rejection Mode nations of 16 analog input channels operating in single- n 2ppm INL, No Missing Codes ended or differential modes) or its internal temperature n 1ppm Offset and 15ppm Full-Scale Error sensor. The integrated temperature sensor offers 1/30thC n 2x Speed/Reduced Power Mode (15Hz Using Internal resolution and 2C absolute accuracy. Oscillator and 80A at 7.5Hz Output) The LTC2499 allows a wide common mode input range n No Latency: Digital Filter Settles in a Single Cycle, (0V to V ), independent of the reference voltage. Any CC Even After a New Channel Is Selected combination of single-ended or differential inputs can n Single Supply 2.7V to 5.5V Operation (0.8mW) be selected and the first conversion, after a new channel n Internal Oscillator is selected, is valid. Access to the multiplexer output en- n Tiny 5mm 7mm QFN Package ables optional external amplifiers to be shared between all analog inputs and auto calibration continuously removes a their associated offset and drift. n Direct Sensor Digitizer L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency and Easy Drive are trademarks of Linear Technology Corporation. All other n Direct Temperature Measurement trademarks are the property of their respective owners. n Instrumentation n Industrial Process Control t ypical a Integrated High Performance Temperature Sensor Data Acquisition System with Temperature Compensation 5 2.7V TO 5.5V 4 3 CH0 MUXOUT/ V 10F 0.1F CC ADCIN CH1 2 + REF 1 + IN 1.7k CH7 16-CHANNEL 0 24-BIT ADC MUX CH8 SDA WITH EASY DRIVE 2-WIRE 1 2 I C INTERFACE IN SCL 2 CH15 REF COM 3 f O 4 TEMPERATURE MUXOUT/ OSC SENSOR ADCIN 5 55 30 5 20 45 70 95 120 2499 TA01 TEMPERATURE (C) 2499 TA02 2499fe For more information www.linear.com/LTC2499 1 ABSOLUTE ERROR (C) pplication pplicationsLTC2499 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 + REF , REF ...............................0.3V to (V + 0.3V) CC SCL 2 30 REF ADCINN, ADCINP, MUXOUTP, + SDA 3 29 REF MUXOUTN ................................0.3V to (V + 0.3V) GND 4 28 V CC CC NC 5 27 MUXOUTN Digital Input Voltage ......................0.3V to (V + 0.3V) CC GND ADCINN 6 26 Digital Output Voltage ...................0.3V to (V + 0.3V) CC 39 COM 7 25 ADCINP Operating Temperature Range CH0 8 24 MUXOUTP LTC2499C ................................................ 0C to 70C CH1 9 23 CH15 LTC2499I..............................................40C to 85C CH2 10 22 CH14 Storage Temperature Range ...................65C to 150C CH3 11 21 CH13 20 CH4 12 CH12 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 LTC2499CUHF PBF LTC2499CUHF TRPBF 2499 38-Lead (5mm 7mm) Plastic QFN 0C to 70C LTC2499IUHF PBF LTC2499IUHF TRPBF 2499 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: