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Analog Devices Inc. LTC2445CUHF#PBF
- Part No.:
- LTC2445CUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2445CUHF#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:289
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Product details
Overview
LTC2445CUHF#PBF from Analog Devices (formerly Linear Technology) is a 24-bit, 8-channel (4-differential) no-latency delta-sigma ADC with selectable speed/resolution, 2 µVRMS noise at 1.76 kHz output rate, <5 µV offset over –40°C to 85°C, and integrated internal oscillator - designed for high-precision multiplexed data acquisition in weight scales and auto-ranging DVMs.
For engineers reviewing the LTC2445CUHF#PBF datasheet, LTC2445CUHF#PBF pinout, LTC2445CUHF#PBF application, or LTC2445CUHF#PBF equivalent, key selection criteria include guaranteed modulator lock-up immunity across all input/reference conditions, simultaneous 50 Hz/60 Hz rejection at 6.9 Hz output rate, and MUXOUT/ADCIN terminals enabling external buffering without calibration penalty.
Technical Context
The LTC2445CUHF#PBF employs a proprietary 3rd-order delta-sigma modulator with decimating FIR filter and continuous auto-calibration per conversion cycle - ensuring stable offset, full-scale, and linearity over temperature, supply, and time. Its no-latency architecture guarantees first-conversion validity after channel/speed/resolution changes.
It supports both internal and external serial clock modes via the EXT pin, delivers 32-bit output with embedded status bits (EOC, SIG, over/underrange), and features differential input/reference with GND-to-VCC common-mode range independent of VREF. The MUXOUTP/ADCINP/MUXOUTN/ADCINN pins enable external gain/buffering while preserving DC accuracy through transparent calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - ensures monotonicity and unambiguous digital representation of analog inputs across full dynamic range. |
| RMS Noise | 2 µV at 1.76 kHz output rate; 200 nV at 13.8 Hz with simultaneous 50/60 Hz rejection - enables high-resolution measurement in noisy AC-line environments. |
| INL Error | ±0.0005% of VREF (±5 ppm) - supports 6½-digit DVM-grade linearity without post-calibration trimming. |
| Offset Error | <5 µV (4.5 V ≤ VCC ≤ 5.5 V, –40°C to 85°C) - eliminates need for system-level zero-offset compensation in precision sensor interfaces. |
| Input Channels | 8 single-ended or 4 differential inputs (CH0–CH7) - provides flexible signal routing for multi-sensor systems with shared COM reference. |
| Output Rate | Up to 4 kHz multiplexing rate with external fO; up to 3.5 kHz native - enables real-time scanning of 8 channels at ≥500 Hz per channel in no-latency mode. |
| Supply Current | 8–11 mA in conversion mode; 20 µA in autosleep at 6.9 Hz - balances high-speed acquisition with low-power operation in battery-backed instrumentation. |
Pinout & Package
Package: 38-lead (5 mm × 7 mm) plastic QFN (UHF), 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 and power return | Seven dedicated ground pins minimize ground bounce and improve PSRR; all must connect to low-impedance ground plane. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH during conversion; transitions LOW when 32-bit result is ready - enables precise timing of data reads without polling. |
| EXT (Pin 3) | SCK mode selection | Logic HIGH selects internal SCK generation (SCK = output); LOW selects external SCK control (SCK = input) - configures interface without registers. |
| COM (Pin 7) | Common negative input | Shared IN– for all single-ended configurations; supports GND-to-VCC common-mode voltage - simplifies unipolar sensor interfacing. |
| CH0–CH7 (Pins 9,10,13,14,17,18,21,22) | Analog input channels | Configurable as single-ended or differential pairs; each accepts GND–0.3 V to VCC+0.3 V - accommodates wide-range industrial sensors. |
| MUXOUTP/N (Pins 24,27) | Multiplexer output (±) | Drives external buffer/amplifier; isolated from ADC core - enables gain/level-shifting before digitization without degrading INL. |
| ADCINP/N (Pins 25,26) | ADC input (±) | Accepts buffered signal from MUXOUT; calibrated jointly with MUXOUT path - preserves end-to-end accuracy despite external components. |
| REF+/REF– (Pins 29,30) | Differential reference inputs | Support 0.1 V to VCC differential range with GND-to-VCC common-mode - allows ratiometric sensing using same supply as VCC. |
| SDI/SDO/SCK/CS/FO (Pins 34,37,38,36,35) | 4-wire SPI-compatible interface | CS-active-low enables wake/sleep; SDI configures channel/speed on-the-fly; FO selects internal/external oscillator - no configuration registers needed. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma architecture | First conversion after channel/speed change is fully accurate - eliminates settling delay and enables true real-time multiplexing at 500 Hz per channel. |
| Continuous auto-calibration | Per-conversion offset and full-scale correction - maintains ±5 ppm INL and <5 µV offset over temperature and supply drift without user intervention. |
| MUXOUT/ADCIN signal path | Dedicated buffered interface between multiplexer and ADC core - supports external gain stages while retaining factory-calibrated DC accuracy. |
| Simultaneous 50 Hz/60 Hz rejection | Guaranteed at 6.9 Hz output rate - removes mains interference without notch filters or software post-processing in weigh scale and sensor applications. |
| Internal oscillator + external fO support | No external crystal or clock required; external 0.1–12 MHz oscillator enables precise timing control and higher output rates up to 8 kHz. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
|
Use Scenario: High-precision load cell readout in commercial and industrial weighing systems requiring NTEP/EC type approval. IC Role / Device Role / Timing Role: Primary ADC capturing mV-level bridge outputs with 200 nV RMS noise floor and simultaneous 50/60 Hz rejection at 6.9 Hz. Use Value: Eliminates need for external anti-aliasing filters and digital notch processing, reducing BOM cost and firmware complexity while meeting OIML R76 resolution requirements. |
Use Scenario: Front-end digitization in handheld and benchtop digital multimeters supporting 6½-digit resolution across multiple ranges. IC Role / Device Role / Timing Role: Core 24-bit converter with programmable OSR (256–32768) and 2 µV RMS noise at 1.76 kHz - enables auto-ranging without range-switching glitches. Use Value: Delivers true 6.5-digit effective resolution (1 ppm) with ±0.0005% INL, enabling direct replacement of legacy dual-slope architectures with faster update rates. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
|
Use Scenario: Cold-junction compensation and thermocouple linearization in industrial process controllers and data loggers. IC Role / Device Role / Timing Role: Differential ADC measuring µV-level thermocouple outputs referenced to RTD-based cold-junction sensor, leveraging GND-to-VCC common-mode range. Use Value: Achieves <0.1°C accuracy over –40°C to 85°C using internal calibration - avoids external offset trimming and reduces calibration labor in production test. |
Use Scenario: Multi-channel sensor monitoring in predictive maintenance systems requiring synchronized sampling of vibration, current, and voltage. IC Role / Device Role / Timing Role: 8-channel multiplexer with 4 kHz max mux rate and no-latency conversion - enables interleaved sampling of 8 sensors at 500 Hz each with deterministic timing. Use Value: Guarantees first-sample validity after channel change, eliminating dead time and enabling real-time FFT analysis without data gaps or interpolation 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 |
|---|---|---|---|
| ADS1258IRTCR | 24-bit, 8-channel, but uses internal PGA and fixed 30 kSPS max rate; no MUXOUT/ADCIN path; requires external reference. | Optimized for high-speed, low-noise single-ended measurements; lacks simultaneous 50/60 Hz rejection at low rates. | Select when fixed high-speed acquisition dominates over ultra-low-noise low-rate operation or external buffering is unnecessary. |
| LTC2448CUHF#PBF | Same package and pinout, but lacks MUXOUT/ADCIN pins and has √2 higher RMS noise (e.g., 2.8 µV vs 2 µV at 880 Hz). | Targeted at cost-sensitive applications where external buffering is not required and slightly higher noise is acceptable. | Select when MUXOUT/ADCIN functionality is unused and lower noise is not critical - offers identical footprint and interface compatibility. |
Compared with ADS1258IRTCR and LTC2448CUHF#PBF, the LTC2445CUHF#PBF uniquely combines MUXOUT/ADCIN signal isolation, simultaneous 50/60 Hz rejection at sub-10 Hz rates, and per-conversion auto-calibration - making it optimal for metrology-grade systems requiring field-replaceable sensor front-ends and long-term stability without recalibration.
Availability
LTC2445CUHF#PBF is available at Aetrix Electronics and suitable for weight scales, auto-ranging 6-digit DVMs, and direct temperature measurement systems requiring stable component supply, long-lifecycle availability, and traceable sourcing for industrial OEM programs.
Supply support for LTC2445CUHF#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving precision instrumentation, industrial automation, and medical markets since 1965.
The LTC2445CUHF#PBF belongs to ADI's legacy Linear Technology high-resolution delta-sigma ADC family, engineered specifically for metrology-grade data acquisition where no-latency operation, guaranteed modulator stability, and end-to-end calibration integrity are mandatory.
FAQ
What is the maximum multiplexing rate supported by the LTC2445CUHF#PBF?
The LTC2445CUHF#PBF supports up to 4 kHz multiplexing rate when using an external oscillator on the FO pin. In internal oscillator mode, the maximum multiplexing rate is 3.5 kHz. At 4 kHz, all 8 differential channels can be scanned at 500 Hz per channel with no latency between conversions - ensuring deterministic timing for real-time sensor fusion applications. This capability is enabled by its no-latency delta-sigma architecture and internal reset mechanism between conversions.
Does the LTC2445CUHF#PBF require external components for basic operation?
No, the LTC2445CUHF#PBF operates autonomously with only a 10 µF tantalum and 0.1 µF ceramic capacitor on VCC, and no external clock or reference is mandatory. Its internal oscillator eliminates crystal dependencies, and the integrated auto-calibration removes need for external trim components. However, external buffering via MUXOUT/ADCIN pins is optional and requires discrete op-amps - but their offset errors are automatically canceled by the LTC2445CUHF#PBF's per-conversion calibration.
How does the MUXOUT/ADCIN feature of the LTC2445CUHF#PBF improve system accuracy?
The MUXOUT/ADCIN feature of the LTC2445CUHF#PBF allows insertion of an external amplifier between the multiplexer and ADC core while preserving factory-calibrated accuracy. Because the LTC2445CUHF#PBF performs continuous offset and full-scale calibration on the entire signal chain - including MUXOUT and ADCIN paths - external gain stage errors (e.g., op-amp offset, drift) are automatically nullified. This eliminates manual calibration steps and ensures <5 µV offset and ±5 ppm INL remain valid even with external components.
What is the significance of simultaneous 50 Hz/60 Hz rejection in the LTC2445CUHF#PBF?
Simultaneous 50 Hz/60 Hz rejection in the LTC2445CUHF#PBF means the device inherently suppresses both mains frequencies without software filtering or external notch circuits - achieved through oversampling ratio (OSR) selection that places nulls at both frequencies. This occurs at the 6.9 Hz output rate and is guaranteed across temperature and supply variations. It directly benefits weight scales and sensor systems deployed globally, eliminating line-frequency interference in AC-powered environments without increasing firmware overhead.
Can the LTC2445CUHF#PBF operate with a 2.5 V reference voltage?
Yes, the LTC2445CUHF#PBF supports differential reference voltages from 0.1 V to VCC, including 2.5 V. When REF+ = 2.5 V and REF– = GND, the input full-scale range becomes ±1.25 V, and specifications such as INL (±3 ppm of VREF) and offset error (<5 µV) remain valid. The device's GND-to-VCC common-mode range on REF+ and REF– pins allows flexible ratiometric or independent reference configurations - critical for battery-powered or isolated sensor interfaces.
LTC2445CUHF#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:
- 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:
- -
LTC2445CUHF#PBF FAQ
1.How can I place an order for LTC2445CUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2445CUHF#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 LTC2445CUHF#PBF reliable?
The price and inventory of LTC2445CUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2445CUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2445CUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2445CUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2445CUHF#PBF?
LTC2445CUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2445CUHF#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 LTC2445CUHF#PBF?
For technical support, including LTC2445CUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2445CUHF#PBF requirements.
6.How does Aetrix verify that LTC2445CUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2445CUHF#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 LTC2445CUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2445CUHF#PBF?
All LTC2445CUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2445CUHF#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 LTC2445CUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2445CUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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