LTC2493 Series
24-Bit 2-/4-Channel ∆Σ ADC with Easy Drive Input Current Cancellation and I2C Interface
Manufacturer: Analog Devices Inc
Catalog
24-Bit 2-/4-Channel ∆Σ ADC with Easy Drive Input Current Cancellation and I2C Interface
| Part | Voltage - Supply, Analog [Max] | Voltage - Supply, Analog [Min] | Number of A/D Converters | Configuration | Operating Temperature [Min] | Operating Temperature [Max] | Data Interface | Features | Input Type | Voltage - Supply, Digital [Max] | Voltage - Supply, Digital [Min] | Reference Type | Package / Case | Number of Inputs | Architecture | Supplier Device Package | Mounting Type | Sampling Rate (Per Second) | Number of Bits |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Analog Devices Inc LTC2493IDE#TRPBF | 5.5 V | 2.7 V | 1 | MUX-ADC | -40 °C | 85 °C | I2C | PGA, Selectable Address, Temperature Sensor | Differential, Single Ended | 5.5 V | 2.7 V | External | 14-WFDFN Exposed Pad | 2, 4 | Sigma-Delta | 14-DFN (4x3) | Surface Mount | 15 Per Second | 24 |
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
AI
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