Features and Benefits
- ±0.5ppm INL (Typ)
- 145dB Dynamic Range (Typ) at 61sps
- 131dB Dynamic Range (Typ) at 4ksps
- Guaranteed 32-Bits No Missing Codes
- Configurable Digital Filter with Synchronization
- Relaxed Anti-Aliasing Filter Requirements
- Dual Output 32-Bit SAR ADC
- 32-Bit Digitally Filtered Low Noise Output
- 14-Bit Differential + 8-Bit Common Mode 1Msps No Latency Output
- Wide Input Common-Mode Range
- Guaranteed Operation to 85°C
- 1.8V to 5V SPI-Compatible Serial I/O
- Low Power: 24mW at 1Msps
- 24-Lead 7mm × 4mm DFN Package
The LTC2508-32 is a low noise, low power, high-performance 32-bit ADC with an integrated configurable digital filter. Operating from a single 2.5V supply, the LTC2508-32 features a fully differential input range up to ±VREF , with VREF ranging from 2.5V to 5.1V. The LTC2508-32 supports a wide common mode range from 0V to VREF simplifying analog signal conditioning requirements.
The LTC2508-32 simultaneously provides two output codes: (1) a 32-bit digitally filtered high precision low noise code, and (2) a 22-bit no latency composite code. The configurable digital filter reduces measurement noise by lowpass filtering and down-sampling the stream of data from the SAR ADC core, giving the 32-bit filtered output code. The 22-bit composite code consists of a 14-bit code representing the differential voltage and an 8-bit code representing the common mode voltage. The 22-bit composite code is available each conversion cycle, with no cycle of latency.
The digital filter can be easily configured for 4 different down-sampling factors by pin strapping. The configurations provide a dynamic range of 131dB at 3.9ksps and 145dB at 61sps. The digital lowpass filter relaxes the requirements for analog anti-aliasing. Multiple LTC2508-32 devices can be easily synchronized using the SYNC pin.
- Energy Exploration
- Automated Test Equipment (ATE)
- High-Accuracy Instrumentation
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 2222A features the LTC2508-32 and LTC2512-24 ADCs. The LTC2508-32 and LTC2512-24 are low power, low noise, high speed, 32-bit/24-bit SAR ADCs with an integrated configurable digital averaging filter that operate from a single 2.5V supply. The demo manual refers to the LTC2508-32 but applies to both parts, the only difference being sample rate and number of bits. The DC2222A demonstrates the DC and AC performance of the LTC2508-32 in conjunction with the DC590 or DC2026 QuikEval™ and DC890 PScope™ data collection boards. Use the DC590 or DC2026 to demonstrate DC performance such as peak-to-peak noise and DC linearity.
Documentation & Resources
R549 Reliability Data3/23/201843 K
DC2222A - Demo Manual1/16/2017766K
DN568 - Reference Filter Increases 32-Bit ADC SNR by 6dB9/26/2017236K
Precision ADC Selector Guide8/30/20175M
Reference Filter Increases 32-Bit ADC SNR by 6dB9/26/2017
Interfacing Linduino to LTC2508-327/11/2017
Software & Systems Requirements
Tools & Simulations
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.
Precision ADC Driver Tool
The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input
Software and Simulation
LTC2508-32 Companion Parts
Recommended ADC Drivers
Recommended External Voltage References
Recommended Related Parts
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|
|LTC2508CDKD-32#PBF||Material Declaration||Reliability Data||24-Lead DFN (7mm x 4mm w/ EP)|
|LTC2508CDKD-32#TRPBF||Material Declaration||Reliability Data||24-Lead DFN (7mm x 4mm w/ EP)|
|LTC2508IDKD-32#PBF||Material Declaration||Reliability Data||24-Lead DFN (7mm x 4mm w/ EP)|
|LTC2508IDKD-32#TRPBF||Material Declaration||Reliability Data||24-Lead DFN (7mm x 4mm w/ EP)|
|Wafer Fabrication Data||R549 Reliability Data|
Support & Discussions
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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.