LTC2445
24-Bit High Speed 8-/16-Channel ∆∑ ADCs with Selectable Speed/Resolution
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Overview
Features and Benefits
- Up to 8 Differential or 16 Single-Ended Input Channels
- Up to 8kHz Output Rate
- Up to 4kHz Multiplexing Rate
- Selectable Speed/Resolution
- 2µVRMS Noise at 1.76kHz Output Rate
- 200nVRMS Noise at 13.8Hz Output Rate with Simultaneous 50/60Hz Rejection
- Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions
- 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 Mode, Each Conversion is Accurate Even After a New Channel is Selected
- Internal Oscillator-No External Components
- LTC2445/LTC2449 Include MUXOUT/ADCIN for External Buffering or Gain
- Tiny QFN 5mm x 7mm Package
Product Details
The LTC2444/LTC2445/LTC2448/LTC2449 are 8-/16- channel (4-/8-differential) high speed 24-bit No Latency ∆∑ ADCs. They use a proprietary delta-sigma architecture enabling variable speed/resolution. Through a simple 4-wire serial interface, ten speed/resolution combinations 6.9Hz/280nVRMS to 3.5kHz/25µVRMS (4kHz with external oscillator) can be selected with no latency between conversion results or shift in DC accuracy (offset, full-scale, linearity, drift). Additionally, a 2X speed mode can be selected enabling output rates up to 7kHz (8kHz if an external oscillator is used) with one cycle latency.
Any combination of single-ended or differential inputs can be selected with a common mode input range from ground to VCC, independent of VREF. While operating in the 1X speed mode the first conversion following a new speed, resolution, or channel selection is valid. Since there is no settling time between conversions, all 8 differential channels can be scanned at a rate of 500Hz. At the conclusion of each conversion, the converter is internally reset eliminating any memory effects between successive conversions and assuring stability of the high order delta-sigma modulator.
Applications
- High Speed Multiplexing
- Weight Scales
- Auto Ranging 6-Digit DVMs
- Direct Temperature Measurement
- High Speed Data Acquisition
Product Categories
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.
Documentation & Resources
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R461 Reliability Data3/22/2018
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No Latency Delta-Sigma™ ADCs5/30/2014
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LTC2440: 24-Bit High Speed Differential ΔΣ ADC6/9/2011
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.
Product Recommendations
LTC2445 Companion Parts
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.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC2445CUHF#PBF | Material Declaration | Reliability Data | 38-Lead QFN (5mm x 7mm w/ EP) | |
| LTC2445CUHF#TRPBF | Material Declaration | Reliability Data | 38-Lead QFN (5mm x 7mm w/ EP) | |
| LTC2445IUHF#PBF | Material Declaration | Reliability Data | 38-Lead QFN (5mm x 7mm w/ EP) | |
| LTC2445IUHF#TRPBF | Material Declaration | Reliability Data | 38-Lead QFN (5mm x 7mm w/ EP) | |
| Wafer Fabrication Data | R461 Reliability Data |
Support & Discussions
LTC2445 Discussions
Sample & Buy
Ordering FAQs
See our Ordering FAQs for answers to questions about online orders, payment options and more.
Buy Now Pricing
(**) Displayed Buy Now Price and Price Range is based on small quantity orders.
List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
Please see the latest communication from our CCO regarding lead times.
Sampling
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