LTC2440
24-Bit High Speed Differential ∆∑ ADC with Selectable Speed/Resolution
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Overview
Features and Benefits
- Up to 3.5kHz Output Rate
- Selectable Speed/Resolution
- 2µVRMS Noise at 880Hz Output Rate
- 200nVRMS Noise at 6.9Hz Output Rate with Simultaneous 50/60Hz Rejection
- 0.0005% INL, No Missing Codes
- Autosleep Enables 20µA Operation at 6.9Hz
- < 5µV Offset (4.5V < VCC < 5.5V, –40°C to 85°C)
- Differential Input and Differential Reference with GND to VCC Common Mode Range
- No Latency, Each Conversion is Accurate Even After an Input Step
- Internal Oscillator—No External Components
- Pin Compatible with the LTC2410
- 24-Bit ADC in Narrow 16-Lead SSOP Package
Product Details
The LTC2440 is a high speed 24-bit No Latency ∆∑™ ADC with 5ppm INL and 5µV offset. It uses proprietary Delta Sigma architecture enabling variable speed and resolution with no latency. Ten speed/resolution combinations (6.9Hz/ 200nVRMS to 3.5kHz/25µVRMS) are programmed through a simple serial interface. Alternatively, by tying a single pin HIGH or LOW, a fast (880Hz/2µVRMS) or ultralow noise (6.9Hz, 200nVRMS, 50/60Hz rejection) speed/resolution combination can be easily selected. The accuracy (offset, full-scale, linearity, drift) and power dissipation are independent of the speed selected. Since there is no latency, a speed/resolution change may be made between conversions with no degradation in performance.
Following each conversion cycle, the LTC2440 automatically enters a low power sleep state. Power dissipation may be reduced by increasing the duration of this sleep state. For example, running at the 3.5kHz conversion speed but reading data at a 100Hz rate draws 240µA average current (1.1mW) while reading data at a 7Hz output rate draws only 25µA (125µW).The LTC2440 communicates through a flexible 3-wire or 4-wire digital interface that is compatible with the LTC2410 and is available in a narrow 16-lead SSOP package.
Applications
- High Speed Multiplexing
- Weight Scales
- Auto Ranging 6-Digit DVMs
- Direct Temperature Measurement
- High Speed Data Acquisition
Product Categories
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)
Documentation & Resources
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R461 Reliability Data3/22/2018PDF31 K
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AN96 - Delta Sigma ADC Bridge Measurement Techniques10/15/2007PDF226K
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DC570A - Demo Manual5/22/2015PDF252K
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No Latency Delta-Sigma™ ADCs5/30/2014PDF640K
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LTC2440: 24-Bit High Speed Differential ΔΣ ADC6/9/2011PDF710K
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24-Bit ADC Challenges ΔΣ Conventions3/1/2003 LT Journal
Tools & Simulations
Linduino
Linduino is Analog Devices’ Arduino compatible system for developing and distributing firmware libraries and example code for our integrated circuits. Each Linduino-supported product includes an example main program, defined in the LTSketchbook/Part Number folder and driver code, defined in the LTSketchbook/libraries folder.
Linduino code repository on GitHub and instructions on how to use the code.
Design Resources
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.
PCN-PDN Information
Sample & Buy
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Buy Now Pricing
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List Pricing
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Lead Times
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Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
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.