LTC2508-32 - 32-Bit Over-Sampling ADC with Configurable Digital Filter
Features
- ±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
Typical Application
Description
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.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC2508CDKD-32#PBF | 7x4 DFN-24 | DKD | C | 05-08-1864 | Yes |
| LTC2508CDKD-32#TRPBF | 7x4 DFN-24 | DKD | C | 05-08-1864 | Yes |
| LTC2508IDKD-32#PBF | 7x4 DFN-24 | DKD | I | 05-08-1864 | Yes |
| LTC2508IDKD-32#TRPBF | 7x4 DFN-24 | DKD | I | 05-08-1864 | 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 | |
|---|---|---|---|---|---|---|
| LTC2508CDKD-32#PBF | 7x4 DFN-24 | C | $12.79 | $8.95 | Yes | |
| LTC2508CDKD-32#TRPBF | 7x4 DFN-24 | C | $12.85 | $9.01 | Yes | |
| LTC2508IDKD-32#PBF | 7x4 DFN-24 | I | $14.71 | $10.30 | Yes | |
| LTC2508IDKD-32#TRPBF | 7x4 DFN-24 | I | $14.77 | $10.36 | 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 |
|---|---|---|---|
| DC2222A-B | LTC2508-32 Demo Board | 32-Bit Over-Sampling ADC with Configurable Digital Filter (req DC590, DC2026 or DC890) | $200.00 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC2026C | Linduino One Isolated USB Demo Board: An Arduino- and QuikEval-Compatible Code Development Platform | $75.00 | |
| DC590B | Isolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards | $50.00 | |
| DC890B | USB Data Acquisition Controller, for PScope Evaluation Kits (up to 250Mbps, CMOS/LVDS) | $300.00 | |
| Buy Now | |||
Applications
- Seismology
- Energy Exploration
- Automated Test Equipment (ATE)
- High-Accuracy Instrumentation
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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.