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Analog Devices Inc. LTC2444CUHF#TRPBF
- Part No.:
- LTC2444CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2444CUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,623
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Product details
Overview
LTC2444CUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit no-latency delta-sigma ADC with 8 differential or 16 single-ended input channels, internal oscillator, and selectable speed/resolution modes. It delivers 2 µVRMS noise at 1.76 kHz output rate and 200 nVRMS at 13.8 Hz with simultaneous 50/60 Hz rejection-enabling high-precision weight scales and auto-ranging DVMs.
For engineers reviewing the LTC2444CUHF#TRPBF datasheet, LTC2444CUHF#TRPBF pinout, LTC2444CUHF#TRPBF application, or LTC2444CUHF#TRPBF equivalent, key selection criteria include guaranteed modulator stability under all input/reference conditions, 0.0005% INL, <5 µV offset over –40°C to 85°C, and no latency mode ensuring valid first-conversion accuracy after channel/speed changes.
Technical Context
The LTC2444CUHF#TRPBF implements a proprietary 3rd-order delta-sigma modulator with decimating FIR filter and continuous on-the-fly offset/full-scale calibration per conversion cycle. Its architecture supports ten discrete speed/resolution combinations-from 6.9 Hz/280 nVRMS to 3.5 kHz/25 µVRMS-with zero latency in 1X mode and one-cycle latency in 2X mode.
It features a 4-wire SPI-compatible serial interface (SDI/SDO/SCK/CS), internal/external SCK selection via EXT pin, and BUSY-driven timing control. Input common-mode range spans GND to VCC, independent of reference voltage, and supports differential input with ±0.5·VREF full-scale range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes-guarantees monotonicity and unambiguous digital representation across full dynamic range. |
| INL | ±0.0005% of VREF (±12 ppm)-ensures accurate end-point linearity critical for metrology-grade measurements. |
| Offset Error | <5 µV (4.5 V ≤ VCC ≤ 5.5 V, –40°C to 85°C)-minimizes zero-point drift without external trimming. |
| RMS Noise | 200 nV at 13.8 Hz output rate with simultaneous 50/60 Hz rejection-enables direct thermocouple or strain gauge digitization in noisy AC environments. |
| Output Rate | Up to 4 kHz multiplexing rate with external oscillator-supports real-time scanning of all 8 differential channels at 500 Hz per channel. |
| Supply Current | 8–11 mA in conversion mode; 20 µA in autosleep at 6.9 Hz-reduces power in battery-operated precision instruments. |
| Input Range | Differential input: ±0.5·VREF; common-mode: GND to VCC-allows direct interfacing to sensors with rail-to-rail output swing. |
Pinout & Package
Package: 38-lead (5 mm × 7 mm) plastic QFN (UHF package) with exposed pad (Pin 39) soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 5, 6, 31, 32, 33) | Ground reference and decoupling return | Seven dedicated ground pins ensure low-impedance return paths for analog/digital currents and minimize supply coupling. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH signal indicates ongoing conversion; transitions LOW when 32-bit result is ready for readout-enables precise timing without polling. |
| EXT (Pin 3) | Serial clock source selector | Logic HIGH enables internal SCK generation; logic LOW configures SCK as external clock input-no register programming required. |
| COM (Pin 7) | Common negative input for single-ended mode | Serves as shared IN– for CH0–CH15 in single-ended configurations; supports rail-to-rail common-mode voltage (GND to VCC). |
| CH0–CH7 (Pins 9, 10, 13, 14, 17, 18, 21, 22) | Analog input channels | Configurable as differential pairs (e.g., CH0/CH1) or single-ended inputs referenced to COM-supports up to 8 differential or 16 single-ended sources. |
| VCC (Pin 28) | Positive supply | 4.5 V to 5.5 V operation; requires local 10 µF tantalum + 0.1 µF ceramic bypass-ensures stable modulator performance under dynamic load. |
| REF+/REF– (Pins 29, 30) | Differential reference inputs | Accept 0.1 V to VCC differential reference; common-mode range extends from GND to VCC-enables ratiometric sensing with unregulated references. |
| SDI/SDO/SCK/CS (Pins 34, 37, 38, 36) | 4-wire serial interface | Compatible with Linear/Analog Devices ∆Σ family; supports both internal and external clocking-simplifies firmware reuse across product lines. |
Key Features
| Feature | Design Value |
|---|---|
| No latency mode | First conversion after channel/speed change is fully accurate-eliminates settling delays in multiplexed sensor systems. |
| Continuous auto-calibration | Per-conversion offset and full-scale correction-maintains <5 µV offset and ±12 ppm INL over temperature and supply variation. |
| Simultaneous 50/60 Hz rejection | Hardware-filtered at 6.9 Hz output rate-removes mains interference without software averaging or external notch filters. |
| Guaranteed modulator stability | Immune to lock-up under any input/reference condition-including overrange, underrange, and floating inputs-ensures robust field operation. |
| Autosleep at 6.9 Hz | Reduces current to 20 µA while preserving full resolution-extends battery life in portable test equipment and IoT edge nodes. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
|
Use Scenario: High-resolution weighing of industrial loads using strain gauge bridges with mV/V output. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing bridge differential voltage with simultaneous 50/60 Hz rejection and no latency during channel switching between tare/weight readings. Use Value: Achieves 1:1,000,000 effective resolution (0.1 ppm) at 13.8 Hz with 200 nVRMS noise-enabling Class III legal-for-trade accuracy without external amplification. |
Use Scenario: Benchtop digital multimeter supporting autoranging across µV to 10 V full-scale ranges. IC Role / Device Role / Timing Role: Core metrology ADC providing programmable speed/resolution to match range selection-e.g., 280 nVRMS at 6.9 Hz for µV measurements, 25 µVRMS at 3.5 kHz for fast AC response. Use Value: Eliminates need for multiple ADCs or external gain stages-single device covers 120 dB dynamic range with consistent 24-bit linearity and auto-calibration. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
|
Use Scenario: Cold-junction compensation and thermocouple voltage digitization in industrial process controllers. IC Role / Device Role / Timing Role: Direct thermocouple interface with differential input, rail-to-rail common-mode support, and integrated 50/60 Hz rejection for factory floor EMI immunity. Use Value: Measures sub-µV thermocouple signals (e.g., Type K at 0.041 mV/°C) with 200 nVRMS noise-resolves 0.005°C increments without cold-junction sensor error propagation. |
Use Scenario: Real-time monitoring of motor phase currents in servo drives using shunt resistors. IC Role / Device Role / Timing Role: Multiplexed ADC scanning 8 isolated current-sense channels at 500 Hz per channel (4 kHz aggregate) with no latency between samples. Use Value: Captures transient overcurrent events within 2 ms (at 500 Hz) while maintaining 24-bit fidelity-enables fast fault detection without sacrificing resolution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1256IDBT | 24-bit, 30 kSPS, 8-channel, but requires external crystal and has 100 µs latency; no simultaneous 50/60 Hz rejection. | Higher throughput but lower noise floor (1 µVRMS at 10 SPS); lacks integrated auto-calibration and true no-latency multiplexing. | Select when maximum sampling rate >4 kHz is required and external filtering can be added for AC line rejection. |
| LTC2449CUHF#TRPBF | Same pinout and interface, but includes MUXOUT/ADCIN pins and √2 lower RMS noise (141 nVRMS at 13.8 Hz). | Enables external buffering/gain for high-impedance sensors; optimized for ultra-low-noise applications where additional PCB area is available. | Select when driving high-Z sources (e.g., piezoelectric sensors) or when sub-200 nVRMS noise is mandatory. |
Compared with ADS1256IDBT, LTC2444CUHF#TRPBF offers superior noise performance and built-in 50/60 Hz rejection at lower power, while LTC2449CUHF#TRPBF extends noise advantage and adds signal conditioning flexibility-making LTC2444CUHF#TRPBF the optimal balance of integration, metrology-grade accuracy, and ease of use.
Availability
LTC2444CUHF#TRPBF is available at Aetrix Electronics and suitable for weight scales, auto-ranging DVMs, and direct temperature measurement systems requiring stable component supply, long-term calibration consistency, and industrial temperature range support (0°C to 70°C).
Supply support for LTC2444CUHF#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2444CUHF#TRPBF belongs to the LTC244x family of no-latency delta-sigma ADCs designed specifically for high-accuracy, low-power, multi-channel data acquisition in metrology, industrial automation, and test equipment.
FAQ
What is the operating temperature range for the LTC2444CUHF#TRPBF?
The LTC2444CUHF#TRPBF is specified for commercial temperature operation from 0°C to 70°C. This grade is validated across the full range for parameters including offset error (<5 µV), INL (±0.0005%), and RMS noise (200 nV at 13.8 Hz). For extended industrial operation (–40°C to 85°C), the LTC2444IUHF#TRPBF variant is available.
Does the LTC2444CUHF#TRPBF require an external oscillator?
No-the LTC2444CUHF#TRPBF includes a fully integrated internal oscillator and operates without external timing components. The FO pin may be tied to GND or VCC to select internal clocking; an external oscillator (0.1–12 MHz) is optional and only needed to achieve maximum 4 kHz multiplexing rate or 8 kHz output rate in 2X mode.
How does the no-latency feature of the LTC2444CUHF#TRPBF work in practice?
The no-latency feature ensures that the first conversion result after selecting a new input channel or speed/resolution setting is fully accurate-no settling delay or invalid samples. For example, switching from CH0 to CH7 in 1X mode yields a valid 24-bit reading within the standard conversion time (e.g., 1.13 ms at OSR=32768), eliminating the need for discarded "settling" conversions in multiplexed systems.
Can the LTC2444CUHF#TRPBF interface directly with thermocouples?
Yes-the LTC2444CUHF#TRPBF supports direct thermocouple connection via its differential inputs (e.g., CH0/CH1) with rail-to-rail common-mode range (GND to VCC) and ±0.5·VREF full-scale range. At 13.8 Hz output rate, its 200 nVRMS noise resolves better than 0.005°C for Type K thermocouples, and simultaneous 50/60 Hz rejection suppresses ambient EMI without external filters.
What is the function of the NC pins on the LTC2444CUHF#TRPBF?
The NC pins (Pins 8, 11, 12, 15, 16, 19, 20, 23) on the LTC2444CUHF#TRPBF serve as channel isolation shields for differential input pairs. They may be left floating or tied to any voltage between 0 V and VCC to reduce crosstalk between adjacent differential channels-critical for maintaining >120 dB input common-mode rejection in high-density PCB layouts.
LTC2444CUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 8k
- Number of Inputs:
- 4, 8
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2444CUHF#TRPBF FAQ
1.How can I place an order for LTC2444CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2444CUHF#TRPBF on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LTC2444CUHF#TRPBF reliable?
The price and inventory of LTC2444CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2444CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2444CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2444CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2444CUHF#TRPBF?
LTC2444CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2444CUHF#TRPBF order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LTC2444CUHF#TRPBF?
For technical support, including LTC2444CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2444CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2444CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2444CUHF#TRPBF products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LTC2444CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2444CUHF#TRPBF?
All LTC2444CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2444CUHF#TRPBF, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LTC2444CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2444CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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