LTC2451 Ultra-Tiny, 16-Bit ADC 2 with I C Interface FEATURES DESCRIPTION n GND to V Single-Ended Input Range The LTC 2451 is an ultra-tiny, 16-bit, analog-to-digital CC n 0.02LSB RMS Noise converter. The LTC2451 uses a single 2.7V to 5.5V sup- n 2LSB INL, No Missing Codes ply, accepts a single-ended analog input voltage and 2 n 1LSB Offset Error communicates through an I C interface. The converter n 4LSB Full-Scale Error is available in an 8-pin, 3mm 2mm DFN or TSOT-23 n Programmable 30/60 Conversions per Second package. It includes an integrated oscillator that does not n Single Conversion Settling Time for Multiplexed require any external components. It uses a delta-sigma Applications modulator as a converter core and provides single-cycle n Single-Cycle Operation with Auto Shutdown settling time for multiplexed applications. The LTC2451 n 400A Supply Current includes a proprietary input sampling scheme that re- n 0.2A Sleep Current duces the average input sampling current several orders n Internal OscillatorNo External Components Required of magnitude lower than conventional converters. n Single Supply, 2.7V to 5.5V Operation The LTC2451 is capable of up to 60 conversions per 2 n 2-Wire I C Interface second and, due to the very large oversampling ratio, n Ultra-Tiny 3mm 2mm DFN or TSOT-23 Package has extremely relaxed antialiasing requirements. In the 30Hz mode, the LTC2451 includes continuous internal APPLICATIONS offset calibration algorithms which are transparent to the n System Monitoring user, ensuring accur acy over time and over the operating n + Environmental Monitoring temperature range. The converter has external REF and n Direct Temperature Measurements REF pins and the input voltage can range from V to REF n + + Instrumentation V . If V = V and V = GND, the input voltage REF REF CC REF n Industrial Process Control can range from GND to V . CC n Data Acquisition Following a single conversion, the LTC2451 can auto- n Embedded ADC Upgrades matically enter sleep mode and reduce its power to less L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear than 0.2A. If the user reads the ADC once per second, Technology Corporation. No Latency and Easy Drive are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. the LTC2451 consumes an average of less than 50W Patents, including 6208279, 6411242, 7088280, 7164378. from a 2.7V supply. Integral Nonlinearity, V = 3V CC TYPICAL APPLICATION 3 2 2.7V TO 5.5V 1 0.1F 10F + V REF CC SCL 0 1k T = 90C 2 A 2-WIRE I C LTC2451 IN SDA INTERFACE SENSOR 0.1F 1 REF GND T = 45C, 25C A 2 2451 TA01a 3 0 0.5 1 1.5 2 2.5 3 INPUT VOLTAGE (V) 2451 TA01b 2451fg 1 INL (LSB)LTC2451 ABSOLUTE MAXIMUM RATINGS (Notes 1, 2) Storage Temperature Range ................... 65C to 150C Supply Voltage (V ) ................................... 0.3V to 6V CC Analog Input Voltage (V ) ............ 0.3V to (V + 0.3V) Operating Temperature Range IN CC + LTC2451C ................................................ 0C to 70C Reference Voltage (V , V ) ...0.3V to (V + 0.3V) REF REF CC Digital Voltage (V , V ) .......... 0.3V to (V + 0.3V) LTC2451I.............................................. 40C to 85C SDA SCL CC PIN CONFIGURATION TOP VIEW TOP VIEW GND 1 8 SDA GND 1 8 SDA REF 2 7 SCL REF 2 7 SCL 9 + REF 3 6 IN + REF 3 6 IN V 4 5 GND V 4 5 GND CC CC TS8 PACKAGE 8-LEAD PLASTIC TSOT-23 DDB PACKAGE 8-LEAD (3mm 2mm) PLASTIC DFN C/I GRADE T = 125C, = 140C/W JMAX JA C/I GRADE T = 125C, = 76C/W JMAX JA EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION Lead Free Finish TAPE AND REEL (MINI) TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC2451CDDB TRMPBF LTC2451CDDB TRPBF LDGQ 8-Lead Plastic (3mm 2mm) DFN 0C to 70C LTC2451IDDB TRMPBF LTC2451IDDB TRPBF LDGQ 8-Lead Plastic (3mm 2mm) DFN 40C to 85C LTC2451CTS8 TRMPBF LTC2451CTS8 TRPBF LTDNS 8-Lead Plastic TSOT-23 0C to 70C LTC2451ITS8 TRMPBF LTC2451ITS8 TRPBF LTDNS 8-Lead Plastic TSOT-23 40C to 85C TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container. Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on lead based finish parts. For more information on lead free part marking, go to: