LTC2447 - 24-Bit High Speed 8-Channel Delta Sigma ADCs with Selectable Multiple Reference Inputs
Features
- Five Selectable Differential Reference Inputs
- Four Differential/Eight Single-Ended Inputs
- 4-Way MUX for Multiple Ratiometric
- Measurements
- 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
- LTC2447 Includes MUXOUT/ADCIN for External Buffering or Gain
- Tiny QFN 5mm x 7mm Package
Typical Application
Description
The LTC2446/LTC2447 4-terminal switching enables multiplexed ratiometric measurements. Four sets of selectable differential inputs coupled with four sets of differential reference inputs allow multiple RTDs, bridges and other sensors to be digitized by a single converter. A fifth differential reference input can be selected for any input channel not requiring ratiometric measurements (thermocouples, voltages, current sense, etc.). The flexible input multiplexer allows single-ended or differential inputs coupled with a slaved reference input or a universal reference input.
A proprietary delta-sigma architecture results in absolute accuracy (offset, full-scale, linearity) of 15ppm, noise as low as 200nVRMS and speeds as high as 8kHz. Through a simple 4-wire interface, ten speed/resolution combinations can be selected. The first conversion following a speed, resolution, channel change or reference change is valid since there is no settling time between conversions, enabling scan rates of up to 4kHz. Additionally, a 2x mode can be selected for any speed-enabling output rates up to 8kHz with one cycle of latency.
Protected by U.S. Patents, including 6140950, 6169506, 6208279, 6411242, 6639526
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
QFN-38
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 |
|---|---|---|---|---|---|---|
| LTC2447CUHF | QFN | 38 | C | $8.75 | $7.15 | View |
| LTC2447CUHF#PBF | QFN | 38 | C | $8.75 | $7.15 | View |
| LTC2447CUHF#TR | QFN | 38 | C | $7.25 | View | |
| LTC2447CUHF#TRPBF | QFN | 38 | C | $7.25 | View | |
| LTC2447IUHF | QFN | 38 | I | $10.15 | $8.25 | View |
| LTC2447IUHF#PBF | QFN | 38 | I | $10.15 | $8.25 | View |
| LTC2447IUHF#TR | QFN | 38 | I | $8.35 | View | |
| LTC2447IUHF#TRPBF | QFN | 38 | I | $8.35 | 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 |
|---|---|---|---|
| DC846A | LTC2447UHF | 24-Bit High Speed 4-/8-Channel 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
- Flow
- Weight Scales
- Pressure
- Direct Temperature Measurement
- Gas Chromatography
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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.