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Analog Devices Inc. LTC2448CUHF#PBF
- Part No.:
- LTC2448CUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2448CUHF#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:590
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Product details
Overview
LTC2448CUHF#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 280nVRMS noise at 6.9Hz output rate with simultaneous 50Hz/60Hz rejection, <5µV offset, and 0.0005% INL - optimized for high-precision industrial weighing and direct temperature measurement systems.
For engineers reviewing the LTC2448CUHF#PBF datasheet, LTC2448CUHF#PBF pinout, LTC2448CUHF#PBF application, or LTC2448CUHF#PBF equivalent, key selection criteria include guaranteed modulator stability under all input/reference conditions, true no-latency mode enabling valid first-conversion accuracy after channel/speed change, and compatibility with 4-wire SPI interface without external timing components.
Technical Context
The LTC2448CUHF#PBF implements a proprietary 3rd-order delta-sigma modulator with decimating FIR filter and on-the-fly auto-calibration of offset and full-scale every conversion cycle. Its SoftSpan architecture supports ten discrete speed/resolution combinations (6.9Hz to 3.5kHz output rate, extendable to 8kHz with external oscillator), all maintaining DC accuracy without settling delay.
It operates in two serial interface modes: internal SCK (SCK pin outputs clock) or external SCK (SCK pin accepts user clock), selected via the EXT pin. The 32-bit output format includes 24-bit result + 3 status bits (EOC, SIG, DMY) + 5 sub-LSBs, with overrange/underrange detection encoded in Bits 29–28.
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. |
| RMS Noise | 280nV at 6.9Hz output rate - enables 20-bit effective resolution in low-speed precision applications with simultaneous 50/60Hz line rejection. |
| INL | ±0.0005% of VREF - ensures accurate end-point linearity critical for metrology-grade weight scales and calibration equipment. |
| Offset Error | <5µV (4.5V ≤ VCC ≤ 5.5V, –40°C to 85°C) - eliminates need for system-level offset trimming in battery-powered portable instruments. |
| Input Channels | 16 single-ended or 8 differential inputs with GND-to-VCC common-mode range - supports flexible sensor interfacing without level-shifting circuitry. |
| Supply Current | 8mA typical in conversion mode; 20µA in autosleep at 6.9Hz - enables energy-efficient operation in always-on monitoring systems. |
| Reference Range | 0.1V to VCC differential reference - allows use of low-voltage references to improve INL while maintaining full 24-bit dynamic range. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN (UHF package) with exposed thermal pad (Pin 39 = GND). Requires soldering exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,4,5,6,31,32,33) | Power and signal ground | Seven dedicated ground pins minimize ground bounce and provide low-impedance return paths for analog/digital currents. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH during conversion; transitions LOW when 32-bit result is ready - enables interrupt-driven data capture without polling. |
| EXT (Pin 3) | SCK mode selector | Logic HIGH selects internal SCK generation; LOW configures SCK as external clock input - determines serial interface timing control responsibility. |
| COM (Pin 7) | Common negative input | Shared IN– node for all single-ended configurations - simplifies wiring in multi-sensor unipolar systems (e.g., RTD arrays). |
| CH0–CH15 (Pins 8–23) | Analog input channels | Programmable as single-ended or differential pairs - supports mixed topology (e.g., CH0–CH1 differential thermocouple + CH2 single-ended strain gauge). |
| VCC (Pin 28) | Positive supply | 4.5V–5.5V operation with mandatory 10µF tantalum + 0.1µF ceramic bypass - ensures stable modulator clock and reference regulation. |
| REF+ / REF– (Pins 29/30) | Differential reference inputs | Accept 0.1V–VCC differential voltage with GND-to-VCC common-mode range - enables ratiometric sensing using same supply as sensors. |
| SDI / SDO / SCK / CS (Pins 34,37,38,36) | 4-wire SPI interface | CS-active-low enables data output and wakes device; SDI configures next conversion; SDO outputs 32-bit frame with EOC/SIG status bits. |
| FO (Pin 35) | Oscillator control | Tied to GND or VCC to select internal oscillator; connects to external 0.1–12MHz source for higher output rates up to 8kHz. |
Key Features
| Feature | Design Value |
|---|---|
| No latency mode | First conversion after channel/speed change is fully accurate - eliminates dead time in multiplexed sensor arrays (e.g., scanning 8 thermocouples at 500Hz). |
| Per-conversion auto-calibration | Continuous offset and full-scale correction - maintains ±5ppm stability over temperature and supply drift without external calibration routines. |
| Simultaneous 50Hz/60Hz rejection | Guaranteed at 6.9Hz output rate - removes power-line interference in medical monitors and lab instrumentation without notch filters. |
| Autosleep at 6.9Hz | 20µA quiescent current - extends battery life in portable DVMs and handheld test equipment between measurements. |
| True differential input & reference | GND-to-VCC common-mode range on all analog pins - enables direct connection to floating sensors (e.g., load cells, thermopiles) without bias networks. |
Applications
| Weight Scales | Auto Ranging 6-Digit DVMs |
|---|---|
|
Use Scenario: High-accuracy platform scales for pharmaceutical dispensing requiring 100,000:1 dynamic range and NTEP certification. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing load cell mV outputs with simultaneous 50/60Hz rejection and per-conversion calibration. Use Value: 280nVRMS noise at 6.9Hz enables 0.1mg resolution on 10kg capacity; no-latency mode allows rapid zero-checking between weighments. |
Use Scenario: Benchtop multimeters performing automatic range switching and true RMS calculation across AC/DC voltage/current. IC Role / Device Role / Timing Role: Core metrology ADC acquiring samples at programmable rates (6.9Hz–3.5kHz) with guaranteed linearity and zero drift. Use Value: 0.0005% INL and <5µV offset eliminate system calibration offsets; internal oscillator removes external crystal BOM cost and layout complexity. |
| Direct Temperature Measurement | High Speed Data Acquisition |
|
Use Scenario: Industrial oven controllers measuring Type-K thermocouples across –200°C to +1350°C with cold-junction compensation. IC Role / Device Role / Timing Role: Precision ADC digitizing thermocouple voltage differentially while rejecting EMI from heating elements. Use Value: Differential input with GND-to-VCC common-mode range accepts thermocouple leads directly; 200nVRMS noise at 13.8Hz enables 0.01°C resolution. |
Use Scenario: Production-line vibration analysis systems sampling accelerometer outputs at up to 4kHz multiplexed across 8 channels. IC Role / Device Role / Timing Role: High-speed delta-sigma ADC scanning 8 differential sensor inputs with no inter-channel settling delay. Use Value: 500Hz per-channel scan rate (8 channels × 500Hz = 4kHz mux rate) achieved with guaranteed first-conversion validity - no discarded samples. |
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 |
|---|---|---|---|
| ADS1256IPW | 24-bit, 8-channel, but requires external crystal; no simultaneous 50/60Hz rejection; 10µV offset (vs. <5µV) | Lower-cost industrial DAQ where line rejection is handled externally; lacks no-latency guarantee for first conversion | Select when external timing is acceptable and system-level filtering compensates for higher offset. |
| MAX11206ETN+ | 24-bit, 4-channel; integrated PGA; 150nVRMS noise at 10SPS; no internal oscillator - requires external clock | Ultra-low-noise sensor front-end for bridge-based transducers; limited channel count precludes multiplexed multi-sensor use | Select for single high-precision sensor nodes needing PGA gain, not for 16-channel scanning. |
Compared with ADS1256IPW and MAX11206ETN+, the LTC2448CUHF#PBF uniquely combines 16-channel flexibility, internal oscillator, simultaneous line-frequency rejection, and guaranteed no-latency operation - making it optimal for compact, self-contained precision measurement systems requiring minimal external components and deterministic timing.
Availability
LTC2448CUHF#PBF is available at Aetrix Electronics and suitable for weight scales, 6-digit DVMs, direct temperature measurement systems, and high-speed data acquisition requiring stable component supply across industrial production lifecycles.
Supply support for LTC2448CUHF#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 (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision measurement and control.
The LTC2448CUHF#PBF belongs to the LTC244x family of no-latency delta-sigma ADCs designed specifically for metrology-grade applications demanding guaranteed first-conversion accuracy, ultra-low drift, and flexible multiplexed sensor interfacing without external timing components.
FAQ
What is the maximum output data rate achievable with LTC2448CUHF#PBF?
The LTC2448CUHF#PBF achieves up to 8kHz output rate when using an external oscillator (0.1–12MHz) in 2X speed mode. With its internal oscillator, the maximum is 7kHz. At 8kHz, the device incurs one-cycle latency - meaning the output corresponds to the previous conversion - whereas 1X mode maintains true no-latency operation. This makes LTC2448CUHF#PBF suitable for both high-throughput scanning and precision single-shot measurements.
Does LTC2448CUHF#PBF require external components for basic operation?
No, the LTC2448CUHF#PBF operates autonomously with only a 10µF tantalum + 0.1µF ceramic capacitor on VCC and proper grounding of all seven GND pins and the exposed pad. It integrates an internal oscillator, eliminating need for crystals or resonators, and performs continuous auto-calibration - no external trim pots, reference buffers, or calibration firmware are required for specified accuracy. This reduces BOM count and layout complexity significantly compared to competing 24-bit ADCs.
How does the no-latency feature of LTC2448CUHF#PBF benefit multiplexed sensor systems?
The no-latency feature ensures the first conversion result after selecting a new input channel or changing speed/resolution is fully accurate - no discarded samples or settling delays. For example, when scanning 8 differential thermocouple inputs at 500Hz per channel (4kHz total mux rate), every sample is usable. This contrasts with conventional delta-sigma ADCs that require multiple conversions to settle, wasting bandwidth and increasing system latency. The LTC2448CUHF#PBF thus maximizes effective throughput in real-time monitoring applications.
What is the significance of simultaneous 50Hz/60Hz rejection in LTC2448CUHF#PBF?
Simultaneous 50Hz/60Hz rejection means the LTC2448CUHF#PBF inherently suppresses both power-line frequencies in a single acquisition at its 6.9Hz output rate - without requiring external notch filters or software averaging. This is achieved through precise modulation and decimation timing synchronized to line cycles. It ensures clean measurements in globally deployed equipment (e.g., medical devices, lab analyzers) operating in diverse grid environments, directly improving measurement integrity in electrically noisy industrial settings.
Can LTC2448CUHF#PBF interface directly with thermocouples without external amplification?
Yes, the LTC2448CUHF#PBF supports direct thermocouple interfacing using its differential input architecture and GND-to-VCC common-mode range. Its 280nVRMS noise at 6.9Hz enables 0.01°C resolution for Type-K thermocouples, and the internal 2.5V or 5V reference can be used for ratiometric cold-junction compensation. No external op-amp or instrumentation amplifier is needed for standard thermocouple ranges, reducing component count and potential error sources in temperature measurement designs incorporating LTC2448CUHF#PBF.
LTC2448CUHF#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2448CUHF#PBF FAQ
1.How can I place an order for LTC2448CUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2448CUHF#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 LTC2448CUHF#PBF reliable?
The price and inventory of LTC2448CUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2448CUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2448CUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2448CUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2448CUHF#PBF?
LTC2448CUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2448CUHF#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 LTC2448CUHF#PBF?
For technical support, including LTC2448CUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2448CUHF#PBF requirements.
6.How does Aetrix verify that LTC2448CUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2448CUHF#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 LTC2448CUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2448CUHF#PBF?
All LTC2448CUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2448CUHF#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 LTC2448CUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2448CUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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