LTC2451 - Ultra-Tiny, 16-Bit Delta Sigma ADC with I2C Interface

Features

• GND to V_CC Single-Ended Input Range
• 0.02LSB RMS Noise
• 2LSB INL, No Missing Codes
• 1LSB Offset Error
• 4LSB Full-Scale Error
• Programmable 30/60 Conversions per Second
• Single Conversion Settling Time for Multiplexed Applications
• Single-Cycle Operation with Auto Shutdown
• 400μA Supply Current
• 0.2μA Sleep Current
• Internal Oscillator—No External Components Required
• Single Supply, 2.7V to 5.5V Operation
• 2-Wire I2C Interface
• Ultra-Tiny 3mm x 2mm DFN  or TSOT-23 Package

Typical Application

Description

The LTC2451 is an ultra-tiny, 16-bit, analog-to-digital converter. The LTC2451 uses a single 2.7V to 5.5V supply, accepts a single-ended analog input voltage and communicates through an I²C interface. The converter is available in an 8-pin, 3mm × 2mm DFN  or TSOT-23 package. It includes an integrated oscillator that does not require any external components. It uses a delta-sigma modulator as a converter core and provides single-cycle settling time for multiplexed applications. The LTC2451 includes a proprietary input sampling scheme that reduces the aver- age input sampling current several orders of magnitude lower than conventional Δ∑ converters.

The LTC2451 is capable of up to 60 conversions per second and, due to the very large oversampling ratio, has extremely relaxed antialiasing requirements. In the 30Hz mode, the LTC2451 includes continuous internal offset calibration algorithms which are transparent to the user, ensuring accuracy over time and over the operating temperature range. The converter has external REF+ and REF – pins and the input voltage can range from V_REF– to V_REF+. If V_REF+ = V_CC and V_REF– = GND, the input voltage can range from GND to V_CC.

Following a single conversion, the LTC2451 can automatically enter sleep mode and reduce its power to less than 0.2μA. If the user reads the ADC once per second, the LTC2451 consumes an average of less than 50μW from a 2.7V supply.

Packaging

DFN-8

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
• Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*	RoHS Data
LTC2451CDDB#PBF	DFN	8	C	$2.14		View
LTC2451CDDB#TRMPBF	DFN	8	C	$2.14	$1.20	View
LTC2451CDDB#TRPBF	DFN	8	C		$1.15	View
LTC2451CTS8#TRMPBF	SOT	8	C	$2.14	$1.20	View
LTC2451CTS8#TRPBF	SOT	8	C		$1.15	View
LTC2451IDDB#PBF	DFN	8	I	$2.55		View
LTC2451IDDB#TRMPBF	DFN	8	I	$2.55	$1.43	View
LTC2451IDDB#TRPBF	DFN	8	I		$1.38	View
LTC2451ITS8#TRMPBF	SOT	8	I	$2.55	$1.43	View
LTC2451ITS8#TRPBF	SOT	8	I		$1.38	View
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^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Applications

• System Monitoring
• Environmental Monitoring
• Direct Temperature Measurements
• Instrumentation
• Industrial Process Control
• Data Acquisition
• Embedded ADC Upgrades

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