LTC2489 Series

16-Bit 2-/4-Channel ∆Σ ADC with Easy Drive Input Current Cancellation and I2C Interface

Catalog

16-Bit 2-/4-Channel ∆Σ ADC with Easy Drive Input Current Cancellation and I2C Interface

Part	Configuration	Number of Inputs	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Input Type	Supplier Device Package	Voltage - Supply, Analog [Min]	Voltage - Supply, Analog [Max]	Number of A/D Converters	Sampling Rate (Per Second)	Number of Bits	Package / Case	Data Interface	Features	Mounting Type	Architecture	Operating Temperature [Max]	Operating Temperature [Min]	Reference Type
Analog Devices LTC2489IDE#TRPBF	MUX-ADC	2 4	5.5 V	2.7 V	Differential Single Ended	14-DFN (4x3)	2.7 V	5.5 V	1	7.5 Per Second	16	14-WFDFN Exposed Pad	I2C	PGA Selectable Address	Surface Mount	Sigma-Delta	85 °C	-40 °C	External
Analog Devices LTC2489CDE#PBF	MUX-ADC	2 4	5.5 V	2.7 V	Differential Single Ended	14-DFN (4x3)	2.7 V	5.5 V	1	7.5 Per Second	16	14-WFDFN Exposed Pad	I2C	PGA Selectable Address	Surface Mount	Sigma-Delta	70 °C	0 °C	External

Catalog

16-Bit 2-/4-Channel ∆Σ ADC with Easy Drive Input Current Cancellation and I2C Interface

Key Features

• Up to 2 Differential or 4 Single-Ended Inputs

• Easy Drive™Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current

• Directly Digitizes High Impedance Sensors with Full Accuracy

• 2-Wire I2C Interface with 9 Addresses Plus One Global Address for Synchronization

• 600nV RMS Noise (0.02LSB Transition Noise)

• GND to VCCInput/Reference Common Mode Range

• Simultaneous 50Hz/60Hz Rejection

• 2ppm INL, No Missing Codes

• 1ppm Offset and 15ppm Full-Scale Error

• No Latency: Digital Filter Settles in a Single Cycle, Even After a New Channel is Selected

• Single Supply, 2.7V to 5.5V Operation (0.8mW)

• Internal Oscillator

• Tiny 4mm × 3mm DFN Package

Description

The LTC2489 is a 4-channel (2-channel differential), 16-bit, No Latency ΔΣ™ADC with Easy Drive technology and a 2-wire, I2C interface. The patented sampling scheme eliminates dynamic input current errors and the shortcomings of on-chip buffering through automatic cancellation of differential input current. This allows large external source impedances and rail-to-rail input signals to be directly digitized while maintaining exceptional DC accuracy.The LTC2489 includes an integrated oscillator. This device can be configured to measure an external signal from combinations of 4 analog input channels operating in single ended or differential modes. It automatically rejects line frequencies of 50Hz and 60Hz simultaneously.The LTC2489 allows a wide, common mode input range (0V to VCC), independent of the reference voltage. Any combination of single-ended or differential inputs can be selected and the first conversion, after a new channel is selected, is valid. Access to the multiplexer output enables optional external amplifiers to be shared between all analog inputs and auto calibration continuously removes their associated offset and drift.ApplicationsDirect Sensor DigitizerDirect Temperature MeasurementInstrumentationIndustrial Process Control