LTC2493 - 24-Bit 2-/4-Channel Delta Sigma ADC with Easy Drive Input Current Cancellation and I2C Interface
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
- 600nVRMS Noise
- Integrated High Accuracy Temperature Sensor
- GND to VCC Input/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
Typical Application
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.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC2493CDE#PBF | 4x3 DFN-14 | DE | C | 05-08-1708 | Yes |
| LTC2493CDE#TRPBF | 4x3 DFN-14 | DE | C | 05-08-1708 | Yes |
| LTC2493IDE#PBF | 4x3 DFN-14 | DE | I | 05-08-1708 | Yes |
| LTC2493IDE#TRPBF | 4x3 DFN-14 | DE | I | 05-08-1708 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- 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 | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LTC2493CDE#PBF | 4x3 DFN-14 | C | $4.32 | $2.95 | Yes | |
| LTC2493CDE#TRPBF | 4x3 DFN-14 | C | $4.38 | $3.01 | Yes | |
| LTC2493IDE#PBF | 4x3 DFN-14 | I | $5.18 | $3.54 | Yes | |
| LTC2493IDE#TRPBF | 4x3 DFN-14 | I | $5.24 | $3.60 | Yes | |
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1010A-A | LTC2493 24-Bit 4/2-ch I2C Delta Sigma ADC (Req. DC590) | $50.00 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC590B | Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards | $50.00 | |
| Buy Now | |||
Applications
- Direct Sensor Digitizer
- Direct Temperature Measurement
- Instrumentation
- Industrial Process Control
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Design Tools
Linear Technology provides a variety of custom design simulation tools and device models to allow even novice designers to quickly and easily evaluate circuits using high performance switching regulators, amplifiers, data converters, filters and more. Please visit our Design Tools page to view and download:
- LTspice - A powerful SPICE simulator, schematic capture and waveform viewer with enhancements and models for easing the simulation of switching regulators
- LTpowerCAD - A complete power supply selection, synthesis and design tool
- LTpowerPlay - A development environment supporting Linear Technology's Digital Power System Management (PSM) products
- PScope & QuikEval - USB-based product demonstration and data acquisition system for use with our ADCs, DACs, and more
- Linduino - Arduino compatible system for developing and distributing firmware libraries and example code
- LinearLab Tools - A collection of Matlab and Python programs that provide direct access to Linear Technology’s data converter evaluation boards
- And More!
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
