LTC2440 - 24-Bit High Speed Differential Delta Sigma ADC with Selectable Speed/Resolution
Features
- 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
Typical Application
Description
The LTC2440 is a high speed 24-bit No Latency Delta Sigma 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.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
SSOP-16
Order Info
- Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
- 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 | Pins | Temp | Price (1-99) | Price (1k)* | RoHS Data |
|---|---|---|---|---|---|---|
| LTC2440CGN | SSOP | 16 | C | $7.25 | $5.75 | View |
| LTC2440CGN#PBF | SSOP | 16 | C | $7.25 | $5.75 | View |
| LTC2440CGN#TR | SSOP | 16 | C | $5.81 | View | |
| LTC2440CGN#TRPBF | SSOP | 16 | C | $5.81 | View | |
| LTC2440IGN | SSOP | 16 | I | $8.00 | $6.50 | View |
| LTC2440IGN#PBF | SSOP | 16 | I | $8.00 | $6.50 | View |
| LTC2440IGN#TR | SSOP | 16 | I | $6.56 | View | |
| LTC2440IGN#TRPBF | SSOP | 16 | I | $6.56 | View | |
| 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 |
|---|---|---|---|
| DC570A | LTC2440CGN | High Speed Delta Sigma ADC, (req DC590) | $50.00 | |
| Buy Now | |||
Companion Boards
| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC590B | USB Serial Controller for Linear Technology QuikEval Demo Boards | $50.00 | |
| Buy Now | |||
Applications
- High Speed Multiplexing
- Weight Scales
- Auto Ranging 6-Digit DVMs
- Direct Temperature Measurement
- High Speed Data Acquisition
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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.