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Analog Devices Inc. LTC2448IUHF#PBF
- Part No.:
- LTC2448IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2448IUHF#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:424
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Product details
Overview
LTC2448IUHF#PBF from Analog Devices (formerly Linear Technology) is a 24-bit, 16-channel (8-differential) no-latency delta-sigma ADC with selectable speed/resolution, internal oscillator, and differential input/reference support. It delivers 200nVRMS noise at 13.8Hz with simultaneous 50Hz/60Hz rejection, 0.0005% INL, and <5µV offset over –40°C to 85°C - enabling high-precision weight scales and auto-ranging DVMs.
For engineers reviewing the LTC2448IUHF#PBF datasheet, LTC2448IUHF#PBF pinout, LTC2448IUHF#PBF application, or LTC2448IUHF#PBF equivalent, key selection criteria include guaranteed modulator stability under all input/reference conditions, no-latency mode for immediate channel-switch accuracy, autosleep for 20µA operation at 6.9Hz, and QFN-38 (5mm × 7mm) package compatibility with high-density PCB layouts.
Technical Context
The LTC2448IUHF#PBF employs a proprietary 3rd-order delta-sigma modulator with decimating FIR filter and continuous auto-calibration of offset and full-scale every conversion cycle. Its no-latency architecture ensures the first result after channel/speed change is fully accurate - eliminating settling delays in multiplexed acquisition.
It supports both internal oscillator (no external components) and external fO up to 12MHz, enabling output rates from 6.9Hz to 8kHz. The 4-wire SPI-compatible interface (SDI/SDO/SCK/CS) operates in internal or external SCK mode via the EXT pin, with BUSY indicating real-time conversion status.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and unambiguous digital representation across full input range. |
| INL | ±0.0005% of VREF (±12 ppm) - enables 6½-digit DVM-grade linearity without post-calibration. |
| Offset Error | <5µV (4.5V ≤ VCC ≤ 5.5V, –40°C to 85°C) - eliminates zero-point drift in precision sensor front-ends. |
| RMS Noise | 200nV at 13.8Hz with simultaneous 50/60Hz rejection - supports direct thermocouple and bridge sensor measurement without external notch filtering. |
| Output Rate Range | 6.9Hz to 8kHz (external fO) - provides scalable throughput from ultra-low-noise DC monitoring to high-speed data logging. |
| Supply Current | 8–11mA active; 20µA in autosleep at 6.9Hz - enables battery-powered portable instrumentation with >1-year runtime. |
| Input Configuration | 16 single-ended or 8 differential channels with GND-to-VCC common-mode range - simplifies interfacing to grounded or floating sensors without level-shifting. |
Pinout & Package
Package: 38-lead plastic QFN (5mm × 7mm), exposed pad (Pin 39) required to be soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 5, 6, 31, 32, 33) | Ground reference | Seven dedicated ground pins minimize ground bounce and improve PSRR in high-resolution measurement systems. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH signal confirms ongoing conversion; transitions LOW when 32-bit result is ready for readout. |
| EXT (Pin 3) | SCK mode select | Logic HIGH enables internal SCK generation on Pin 38; LOW configures SCK as external clock input. |
| COM (Pin 7) | Common negative input | Shared IN– node for all single-ended configurations; supports rail-to-rail common-mode voltage (GND to VCC). |
| CH0–CH15 (Pins 8–23) | Analog input channels | 16 fully programmable inputs supporting mixed single-ended/differential pairs; no channel isolation required. |
| VCC (Pin 28) | Positive supply | 4.5V–5.5V operation; requires local 10µF tantalum + 0.1µF ceramic decoupling for low-noise performance. |
| REF+, REF– (Pins 29, 30) | Differential reference inputs | Accept 0.1V–VCC differential reference; absolute voltages may range independently from GND to VCC. |
| SDI, SDO, SCK, CS (Pins 34, 37, 38, 36) | 4-wire serial interface | Compatible with standard SPI timing; CS-active initiates data transfer; BUSY synchronizes host read timing. |
| FO (Pin 35) | Frequency control | Tie to GND or VCC to enable internal oscillator; connect external clock (0.1–12MHz) for precise timing control. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma architecture | First conversion after channel/speed change is fully accurate - eliminates dead time in multiplexed sensor arrays. |
| Continuous auto-calibration | Offset and full-scale corrected every cycle - ensures long-term stability against temperature, supply, and aging drift. |
| Simultaneous 50Hz/60Hz rejection | Integrated digital filtering at 6.9Hz output rate - removes mains interference without external analog filters or software post-processing. |
| Autosleep mode | 20µA quiescent current at 6.9Hz - extends battery life in portable test equipment and IoT edge nodes. |
| True differential input & reference | GND-to-VCC common-mode range on CHx/COM and REF+/REF– - enables direct connection to unbuffered bridges, RTDs, and thermocouples. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
Use Scenario: High-accuracy industrial weighing system measuring load cells with 0.001% full-scale resolution. IC Role / Device Role / Timing Role: Primary 24-bit ADC digitizing mV-level bridge outputs; performs real-time channel scanning across multiple load points. Use Value: 200nVRMS noise and simultaneous 50/60Hz rejection eliminate need for external synchronous sampling or digital notch filters. |
Use Scenario: Benchtop digital multimeter supporting autoranging across µV to 10V ranges with 6½-digit display. IC Role / Device Role / Timing Role: Core measurement engine providing calibrated 24-bit results with no latency during range switching. Use Value: 0.0005% INL and continuous auto-calibration maintain traceable accuracy across decades of input range without manual recalibration. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
Use Scenario: Cold-junction-compensated thermocouple reader for industrial process monitoring. IC Role / Device Role / Timing Role: Simultaneously digitizes thermocouple voltage and cold-junction sensor (e.g., RTD) on separate channels. Use Value: Differential input with GND-to-VCC common-mode range accepts grounded thermocouple leads; 13.8Hz mode delivers 200nVRMS resolution for sub-0.1°C precision. |
Use Scenario: Modular data logger capturing transient signals from vibration sensors and strain gauges at up to 8kHz. IC Role / Device Role / Timing Role: High-throughput ADC scanning 8 differential channels at 500Hz per channel using internal oscillator. Use Value: 8kHz output rate with external fO and no-latency mode enables gap-free acquisition without inter-channel delay or settling artifacts. |
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 |
|---|---|---|---|
| ADS1258IRHBT | 24-bit, 8-channel, 125kSPS max; fixed 30kSPS output rate; no internal oscillator; requires external clock and reference. | Higher throughput but lacks simultaneous 50/60Hz rejection and autosleep; better suited for fixed-rate streaming than precision DC measurement. | Select ADS1258IRHBT when maximum sample rate >10kSPS is required and external timing/reference infrastructure is available. |
| LTC2449IUHF#PBF | Same pinout and package; includes MUXOUT/ADCIN pins for external buffering; √2 lower RMS noise (≈140nVRMS at 13.8Hz). | Enables high-gain front-end amplification without degrading noise floor; ideal for low-output sensors like micro-strain gauges. | Select LTC2449IUHF#PBF when external gain/buffering is needed and lowest possible noise is critical; otherwise LTC2448IUHF#PBF offers identical core functionality at lower cost. |
Compared with ADS1258IRHBT, LTC2448IUHF#PBF provides integrated oscillator, built-in 50/60Hz rejection, and autosleep - reducing BOM count and power in portable precision instruments. Compared with LTC2449IUHF#PBF, it omits MUXOUT/ADCIN pins, lowering cost where external buffering is unnecessary.
Availability
LTC2448IUHF#PBF 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 integrity, and industrial temperature range support (–40°C to 85°C).
Supply support for LTC2448IUHF#PBF 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 ICs for precision measurement, industrial automation, and communications.
The LTC2448IUHF#PBF belongs to the LTC244x family of no-latency delta-sigma ADCs designed specifically for high-accuracy, multiplexed data acquisition in test equipment, instrumentation, and sensor interfaces where DC stability and noise immunity are critical.
FAQ
What is the maximum output data rate of the LTC2448IUHF#PBF?
The LTC2448IUHF#PBF achieves up to 8kHz output rate when using an external oscillator (fO ≤ 12MHz) in 2X speed mode. With its internal oscillator, the maximum is 7kHz. At the lowest noise setting (13.8Hz), it delivers 200nVRMS with simultaneous 50Hz/60Hz rejection - making LTC2448IUHF#PBF adaptable across both high-speed logging and ultra-precision DC measurement applications.
Does the LTC2448IUHF#PBF require external components for basic operation?
No, the LTC2448IUHF#PBF operates autonomously with only VCC decoupling (10µF tantalum + 0.1µF ceramic) and optional external reference. Its internal oscillator eliminates need for crystals or oscillators; the 4-wire SPI interface needs no pull-ups; and COM pin simplifies single-ended sensor connections. This makes LTC2448IUHF#PBF ideal for space-constrained designs where bill-of-materials reduction is critical.
How does the no-latency feature of the LTC2448IUHF#PBF benefit multiplexed measurements?
The no-latency feature ensures the first conversion result after selecting a new input channel or changing speed/resolution is fully accurate - with no settling delay or invalid samples. This allows deterministic scanning of all 16 channels at up to 500Hz per channel (8 differential × 500Hz = 4kHz total mux rate), making LTC2448IUHF#PBF uniquely suited for real-time multi-sensor systems like automated test equipment and condition monitoring.
What is the role of the BUSY pin on the LTC2448IUHF#PBF?
The BUSY pin (Pin 2) is an active-HIGH open-drain indicator that remains HIGH during conversion and transitions LOW when the 32-bit result is ready for readout. It serves as hardware synchronization for the host controller - eliminating need for polling or fixed delays in the SPI interface. This timing certainty is essential for deterministic data capture in the LTC2448IUHF#PBF's no-latency operation.
Can the LTC2448IUHF#PBF interface directly to thermocouples without external amplification?
Yes, the LTC2448IUHF#PBF supports direct thermocouple connection using its differential input structure and GND-to-VCC common-mode range. When paired with a cold-junction sensor on another channel and configured at 13.8Hz output rate, it achieves 200nVRMS noise - sufficient for sub-0.1°C resolution in Type-K thermocouple systems. No external op-amps or filters are required, simplifying the signal chain and improving reliability of the LTC2448IUHF#PBF-based design.
LTC2448IUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 8k
- Number of Inputs:
- 8, 16
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2448IUHF#PBF FAQ
1.How can I place an order for LTC2448IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2448IUHF#PBF 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 LTC2448IUHF#PBF reliable?
The price and inventory of LTC2448IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2448IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2448IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2448IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2448IUHF#PBF?
LTC2448IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2448IUHF#PBF 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 LTC2448IUHF#PBF?
For technical support, including LTC2448IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2448IUHF#PBF requirements.
6.How does Aetrix verify that LTC2448IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2448IUHF#PBF 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 LTC2448IUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2448IUHF#PBF?
All LTC2448IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2448IUHF#PBF, 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 LTC2448IUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2448IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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