LTC2442 - 24-Bit High Speed 4-Channel Delta Sigma ADC with Integrated Amplifier
Features
- 1ppm Linearity with No Missing Codes
- Integrated Amplifi er for Direct Sensor Digitization
- 2 Differential or 4 Single-Ended Input Channels
- Up to 8kHz Output Rate
- Up to 4kHz Multiplexing Rate
- Selectable Speed/Resolution
2µVRMS Noise at 1.76kHz Output Rate
220nVRMS Noise at 13.8Hz Output Rate with
Simultaneous 50Hz/60Hz Rejection - Guaranteed Modulator Stability and Lock-Up Immunity for any Input and Reference Conditions
- <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
- 36-Lead SSOP Package
Typical Application
Description
The LTC2442 is an ultra high precision, variable speed, 24-bit Delta Sigma ADC with integrated amplifier. The amplifier can be configured as a buffer for easy input drive of high impedance sensors. 1 part-per-million (ppm) linearity is achievable when the amplifier is configured in unity gain. External resistors can be used to set a gain for increased resolution of low level input signals. The positive and negative amplifier supply pins may be tied directly to VCC (4.5V to 5.5V) and GND or biased above VCC and below GND for rail-to-rail input signals.
The proprietary ΔΣ architecture ensures stable DC accuracy through continuous transparent calibration. Ten speed/resolution combinations from 6.9Hz/220nVRMS to 3.5kHz/25µVRMS can be selected with no latency or shift in DC accuracy. Additionally, a 2X speed mode can be selected enabling output rates up to 7kHz (8kHz with an external oscillator) with one cycle latency.
Any combination of single-ended (up to 4 inputs) or differential (up to 2 inputs) can be selected with a common mode input range from ground to VCC. While operating in the 1X speed mode the first conversion following a new speed/resolution or channel selection is valid.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
SSOP-36
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 |
|---|---|---|---|---|---|---|
| LTC2442CG | SSOP | 36 | C | $10.64 | $7.45 | View |
| LTC2442CG#PBF | SSOP | 36 | C | $10.64 | $7.45 | View |
| LTC2442CG#TR | SSOP | 36 | C | $7.55 | View | |
| LTC2442CG#TRPBF | SSOP | 36 | C | $7.55 | View | |
| LTC2442IG | SSOP | 36 | I | $12.77 | $8.94 | View |
| LTC2442IG#PBF | SSOP | 36 | I | $12.77 | $8.94 | View |
| LTC2442IG#TR | SSOP | 36 | I | $9.04 | View | |
| LTC2442IG#TRPBF | SSOP | 36 | I | $9.04 | 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 |
|---|---|---|---|
| DC979A | LTC2442CG 24-Bit Buffered 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
- Auto Ranging 6-Digit DVMs
- High Speed Multiplexing
- Weight Scales
- 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.