LTC2412 2-Channel Differential Input 24-Bit No Latency ADC FEATURES DESCRIPTION n 2-Channel Differential Input with Automatic Chan- The LTC 2412 is a 2-channel differential input micropower nel Selection (Ping-Pong) 24-bit No Latency analog-to-digital converter with an n Low Supply Current: 200A, 4A in Autosleep integrated oscillator. It provides 2ppm INL and 0.16ppm n Differential Input and Differential Reference with RMS noise over the entire supply range. The two differ- GND to V Common Mode Range ential channels are converted alternately with channel ID CC n 2ppm INL, No Missing Codes included in the conversion results. It uses delta-sigma n 2.5ppm Full-Scale Error and 0.1ppm Offset technology and provides single conversion settling of the n 0.16ppm Noise, 22.5 Effective Number of Bits digital filter. Through a single pin, the LTC2412 can be n No Latency: Digital Filter Settles in a Single Cycle and configured for better than 110dB input differential mode Each Channel Conversion is Accurate rejection at 50Hz or 60Hz 2%, or it can be driven by an n Internal OscillatorNo External Components Re- external oscillator for a user defined rejection frequency. quired The internal oscillator requires no external frequency set- n 110dB Min, 50Hz or 60Hz Notch Filter ting components. n Narrow SSOP-16 Package The converter accepts any external differential reference n Single Supply 2.7V to 5.5V Operation voltage from 0.1V to V for flexible ratiometric and re- CC mote sensing measurement configurations. The full-scale APPLICATIONS differential input range is from 0.5V to 0.5V . The REF REF reference common mode voltage, V , and the input REFCM n Direct Sensor Digitizer common mode voltage, V , may be independently set INCM n Weight Scales anywhere within the GND to V . The DC common mode CC n Direct Temperature Measurement input rejection is better than 140dB. n Gas Analyzers n Strain-Gage Transducers The LTC2412 communicates through a flexible 3-wire digi- n Instrumentation tal interface which is compatible with SPI and MICROWIRE n Data Acquisition protocols. n Industrial Process Control L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and No Latency is a trademark of Linear Technology Corporation. All other trademarks are the n 6-Digit DVMs property of their respective owners. TYPICAL APPLICATION Total Unadjusted Error vs Input 2.7V TO 5.5V 1.5 V CC 1F = INTERNAL OSC/50Hz REJECTION 1 14 = EXTERNAL CLOCK SOURCE V F 1.0 CC O = INTERNAL OSC/60Hz REJECTION 2 + REF 4 + 0.5 CH0 LTC2412 5 13 0 CH0 SCK THERMOCOUPLE T = 90C 3 12 3-WIRE A V = 5V REF CC SDO 0.5 + SPI INTERFACE T = 25C REF = 5V A 6 11 + REF = GND CH1 T = 45C CS A V = 5V 1.0 REF 7 CH1 V = 2.5V INCM 8, 9, 10, 15, 16 F = GND O GND 1.5 2412 TA01 2.5 2 1.5 1 0.5 0 0.5 1 1.5 2 2.5 V (V) 2412 TA02 IN 2412fa 1 For more information www.linear.com/LTC2412 TUE (ppm OF V ) REFLTC2412 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Notes 1, 2) TOP VIEW Supply Voltage (V ) to GND ....................... 0.3V to 7V CC 1 16 GND Analog Input Voltage V CC + 2 15 GND REF to GND ......................................0.3V to (V + 0.3V) CC 3 14 F REF O Reference Input Voltage + 4 13 SCK CH0 to GND ......................................0.3V to (V + 0.3V) CC 5 12 SDO CH0 Digital Input Voltage to GND .........0.3V to (V + 0.3V) CC + 6 11 CS CH1 Digital Output Voltage to GND .......0.3V to (V + 0.3V) CC 7 10 GND CH1 Operating Temperature Range 8 9 GND GND LTC2412C ................................................ 0C to 70C GN PACKAGE LTC2412I .............................................40C to 85C 16-LEAD PLASTIC SSOP Storage Temperature Range .................. 65C to 150C T = 125C, = 110C/W JMAX JA Lead Temperature (Soldering, 10 sec) ...................300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2412CGN PBF LTC2412CGN TRPBF 2412 16-Lead Plastic SSOP 0C to 70C LTC2412IGN PBF LTC2412IGN TRPBF 2412I 16-Lead Plastic SSOP 40C to 85C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part marking, go to: