LTC2484: 24-Bit ΔΣ ADC with Easy Drive Input Current Cancellation Data Sheet10/10/2014750K
Features and Benefits
- Easy Drive Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current
- Directly Digitizes High Impedance Sensors with Full Accuracy
- 600nVRMS Noise
- 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 Total Unadjusted Error
- Selectable 2× Speed Mode (15Hz Using Internal Oscillator)
- No Latency: Digital Filter Settles in a Single Cycle
- Single Supply 2.7V to 5.5V Operation
- Internal Oscillator
- Available in a Tiny (3mm × 3mm) 10-Lead DFN Package
The LTC2484 combines a 24-bit No Latency ΔΣ™ analog-to-digital converter with patented 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 input signals with rail-to-rail input range to be directly digitized while maintaining exceptional DC accuracy.
The LTC2484 includes an on-chip oscillator. The LTC2484 can be configured to reject line frequencies. 50Hz, 60Hz or simultaneous 50Hz/60Hz line frequency rejection can be selected as well as a 2× speed-up mode.
The LTC2484 allows a wide common mode input range (0V to VCC) independent of the reference voltage. The reference can be as low as 100mV or can be tied directly to VCC. The LTC2484 includes an on-chip trimmed oscillator, eliminating the need for external crystals or oscillators. Absolute accuracy and low drift are automatically maintained through continuous, transparent, offset and full-scale calibration.
- Direct Sensor Digitizer
- Weight Scales
- Direct Temperature Measurement
- Strain Gauge Transducers
- Industrial Process Control
- DVMs and Meters
Markets and Technologies
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Demonstration circuit DC939 features the LTC2484, a 24-bit high performance DS analog-to-digital converter (ADC). The LTC2484 features 2ppm linearity, 0.5mV offset, and 600nV RMS noise. The input is fully differential, with input common mode rejection of 140 dB. The LTC2484 is available in a 10 pin DFN package and has an easy to use SPI interface. DC939 is a member of ADI's QuickEval™ family of demonstration boards. It is designed to allow easy evaluation of the LTC2484 and may be connected directly to the target applications analog signals while using the DC590 USB Serial Controller board and supplied software to measure performance. The exposed ground planes allow proper grounding to prototype circuitry. After evaluating with ADI's software, the digital signals can be connected to the end application’s processor / controller for development of the serial interface.
Documentation & Resources
R461 Reliability Data3/22/201831 K
DC939A - Demo Manual9/24/2009425K
No Latency Delta-Sigma™ ADCs5/30/2014640K
Ultra-Tiny 16-Bit ΔΣ ADC Family6/29/2010454K
Audio Spectrum Analyzer with the Linduino4/12/2016
Wireless Precision Temperature Sensor Powers Itself, Forms Own Network, Enabling Easy Deployment in Industrial Environments7/1/2014 LT Journal
Product How-to: Precise Wireless Temperature Sensor Powers Itself6/13/2014
Easy Drive Delta-Sigma ADCs Deliver Powerful Features and Reduce Design Effort3/1/2007 LT Journal
Tools & Simulations
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Linduino code repository on GitHub and instructions on how to use the code.
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.