LTC2487 16-Bit 2-/4-Channel DS ADC with PGA, Easy Drive and 2 I C Interface FEATURES DESCRIPTION n Up to 2 Differential or 4 Single-Ended Inputs The LTC 2487 is a 4-channel (2 differential), 16-bit, 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 elimi- n Directly Digitizes High Impedance Sensors with nates 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 9 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 LTC2487 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 4 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 LTC2487 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 LTC2487 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 4mm 3mm DFN Package is selected, is valid. Access to the multiplexer output en- ables optional external amplifiers to be shared between all APPLICATIONS analog inputs and auto calibration continuously removes n Direct Sensor Digitizer their associated offset and drift. n Direct Temperature Measurement All registered trademarks and trademarks are the property of their respective owners. n Instrumentation n Industrial Process Control TYPICAL APPLICATION Built-In High Performance Temperature Sensor Data Acquisition System with Temperature Compensation 5 2.7V TO 5.5V 4 3 0.1F 10F V CH0 CC 2 CH1 1 + REF + 1.7k IN 0 4-CHANNEL 16-BIT ADC SDA 2-WIRE MUX 1 CH2 2 WITH EASY-DRIVE SCL I C INTERFACE CH3 2 IN REF CA1 9-PIN SELECTABLE COM 3 CA0 ADDRESSES 4 TEMPERATURE f O SENSOR 5 OSC 55 30 5 20 45 70 95 120 2487 TA01a TEMPERATURE (C) 2487 TA02 2487fg 1 For more information www.linear.com/LTC2487 ABSOLUTE ERROR (C)LTC2487 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) Supply Voltage (V ) ................................... 0.3V to 6V CC f 1 14 REF O + CA0 2 13 REF Analog Input Voltage CA1 3 12 V CC (CH0 to CH3, COM) ...................0.3V to (V + 0.3V) CC SCL 4 15 11 CH3 + REF , REF ....................................0.3V to (V + 0.3V) CC SDA 5 10 CH2 Digital Input Voltage......................0.3V to (V + 0.3V) CC GND 6 9 CH1 Digital Output Voltage ...................0.3V to (V + 0.3V) COM 7 8 CH0 CC Operating Temperature Range DE PACKAGE 14-LEAD (4mm 3mm) PLASTIC DFN LTC2487C ................................................ 0C to 70C T = 125C, q = 37C/W JMAX JA LTC2487I .............................................40C to 85C EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range .................. 65C to 150C ORDER INFORMATION