LTC2493 Series

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

Catalog

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

Part	Input Type	Number of Inputs	Supplier Device Package	Sampling Rate (Per Second)	Package / Case	Number of Bits	Voltage - Supply, Analog [Min]	Voltage - Supply, Analog [Max]	Configuration	Architecture	Number of A/D Converters	Mounting Type	Reference Type	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Features	Data Interface
Analog Devices LTC2493IDE#TRPBF	Differential Single Ended	2 4	14-DFN (4x3)	15 Per Second	14-WFDFN Exposed Pad	24	2.7 V	5.5 V	MUX-ADC	Sigma-Delta	1	Surface Mount	External	5.5 V	2.7 V	85 °C	-40 °C	PGA Selectable Address Temperature Sensor	I2C

Catalog

24-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

• Integrated High Accuracy Temperature Sensor

• GND to VCCInput/Reference Common Mode Range

• Programmable 50Hz, 60Hz or Simultaneous 50Hz/60Hz Rejection Mode

• 2ppm INL, No Missing Codes

• 1ppm Offset and 15ppm Full-Scale Error

• 2× Speed/Reduced Power Mode (15Hz Using Internal Oscillator and 80μA at 7.5Hz Output)

• 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 LTC2493 is a 4-channel (2-channel differential), 24-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 LTC2493 includes a high accuracy temperature sensor and 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) or its internal temperature sensor. The integrated temperature sensor offers 1/30th°C resolution and 2°C absolute accuracy.The LTC2493 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