LTC2494 Series

16-Bit 8-/16-Channel ΔΣ ADC with PGA and Easy Drive Input Current Cancellation

Catalog

16-Bit 8-/16-Channel ΔΣ ADC with PGA and Easy Drive Input Current Cancellation

Part	Voltage - Supply, Analog [Min]	Voltage - Supply, Analog [Max]	Data Interface	Package / Case	Number of Inputs	Configuration	Sampling Rate (Per Second)	Reference Type	Architecture	Mounting Type	Features	Input Type	Number of A/D Converters	Number of Bits	Voltage - Supply, Digital [Max]	Voltage - Supply, Digital [Min]	Operating Temperature [Max]	Operating Temperature [Min]
Analog Devices LTC2494IUHF#PBF	2.7 V	5.5 V	SPI	38-WFQFN Exposed Pad	16 8	MUX-ADC	15 Per Second	External	Sigma-Delta	Surface Mount	PGA Temperature Sensor	Differential Single Ended	1	16	5.5 V	2.7 V	85 °C	-40 °C
Analog Devices LTC2494IUHF#TRPBF	2.7 V	5.5 V	SPI	38-WFQFN Exposed Pad	16 8	MUX-ADC	15 Per Second	External	Sigma-Delta	Surface Mount	PGA Temperature Sensor	Differential Single Ended	1	16	5.5 V	2.7 V	85 °C	-40 °C
Analog Devices LTC2494CUHF#PBF	2.7 V	5.5 V	SPI	38-WFQFN Exposed Pad	16 8	MUX-ADC	15 Per Second	External	Sigma-Delta	Surface Mount	PGA Temperature Sensor	Differential Single Ended	1	16	5.5 V	2.7 V	70 °C	0 °C

Catalog

16-Bit 8-/16-Channel ΔΣ ADC with PGA and Easy Drive Input Current Cancellation

Key Features

• Up to 8 Differential or 16 Single-Ended Inputs

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

• Directly Digitizes High Impedance Sensors with Full Accuracy

• 600nVRMSNoise

• Programmable Gain from 1 to 256

• 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

• 2x Speed Mode/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

• Internal Oscillator

• Tiny 5mm × 7mm QFN Package

Description

The LTC2494 is a 16-channel (8-differential), 16-bit, No Latency ΔΣ™ADC with Easy Drive technology. 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 LTC2494 includes programmable gain, a high accuracy temperature sensor and an integrated oscillator. This device can be configured to measure an external signal (from combinations of 16 analog input channels operating in single-ended or differential modes) or its internal temperature sensor. The integrated temperature sensor offers 1/2°C resolution and 2°C absolute accuracy. The LTC2494 can be configured to provide a programmable gain from 1 to 256 in 8 steps.The LTC2494 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.ApplicationsDirect Sensor DigitizerDirect Temperature MeasurementInstrumentationIndustrial Process Control