LTC2485
PRODUCTION24-Bit ΔΣ ADC with Easy Drive Input Current Cancellation and I2C Interface
- Part Models
- 4
- 1ku List Price
- Starting From $2.95
Overview
- Easy Drive™ Technology Enables Rail-to-Rail Inputs with Zero Differential Input Current
- Directly Digitizes High Impedance Sensors with Full Accuracy
- GND to VCC Input/Reference Common Mode Range
- 2-Wire I2C Interface
- Programmable 50Hz, 60Hz or Simultaneous 50Hz/60Hz Rejection Mode
- 2ppm (0.25LSB) INL, No Missing Codes
- 1ppm Offset and 15ppm Full-Scale Error
- Selectable 2x Speed Mode
- No Latency: Digital Filter Settles in a Single Cycle
- Single Supply 2.7V to 5.5V Operation
- Internal Oscillator
- Six Addresses Available and One Global Address for Synchronization
- Available in a Tiny (3mm × 3mm) 10-Lead DFN Package
The LTC2485 combines a 24-bit plus sign No Latency ΔΣ™ analog-to-digital converter with patented Easy Drive technology and I2C digital interface. 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 LTC2485 includes an on-chip oscillator. The LTC2485 can be configured through an I2C interface to reject line frequencies. 50Hz, 60Hz or simultaneous 50Hz/60Hz line frequency rejection can be selected as well as a 2x speed-up mode.
The LTC2485 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 LTC2485 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.
Applications
- Direct Sensor Digitizer
- Weight Scales
- Direct Temperature Measurement
- Strain Gauge Transducers
- Instrumentation
- Industrial Process Control
- DVMs and Meters
Documentation
Data Sheet 1
Reliability Data 1
User Guide 1
Design Note 2
Technical Articles 1
Product Selector Card 2
Device Drivers 1
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 Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC2485CDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC2485CDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC2485IDD#PBF | 10-Lead DFN (3mm x 3mm w/ EP) | ||
| LTC2485IDD#TRPBF | 10-Lead DFN (3mm x 3mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Jun 30, 2020 - 20_0244 Notification of Wafer Fab Location Change for 0.6µm CMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan) |
||
| LTC2485CDD#PBF | PRODUCTION | |
| LTC2485CDD#TRPBF | PRODUCTION | |
| LTC2485IDD#PBF | PRODUCTION | |
| LTC2485IDD#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Device Drivers 1
Evaluation Software 0
Can't find the software or driver you need?
Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Analog to Digital Converters (ADCs) 1 | ||
| LTC2991 | RECOMMENDED FOR NEW DESIGNS | Octal I2C Voltage, Current, and Temperature Monitor |
| Level Translators & Buffers 1 | ||
| LTC4317 | PRODUCTION | Dual I2C/SMBus Address Translator |
| Matched Resistors & Transistors 1 | ||
| LT5400 | RECOMMENDED FOR NEW DESIGNS | Quad Matched Resistor Network |
| Oscillators 1 | ||
| LTC6991 | PRODUCTION | TimerBlox: Resettable, Low Frequency Oscillator |
| Voltage References 1 | ||
| LTC6655 | PRODUCTION | 0.25ppm Noise, Low Drift Precision References |
Evaluation Kits
LTC2485 24-Bit Delta-Sigma ADC Demo Board (Requires DC590)
Resources
Reference Designs
