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Analog Devices Inc. LTC2445CUHF#TRPBF
- Part No.:
- LTC2445CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2445CUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,966
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Product details
Overview
LTC2445CUHF#TRPBF 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, simultaneous 50 Hz/60 Hz rejection, and integrated internal oscillator - used in high-precision industrial data acquisition systems requiring channel-scanned accuracy without settling delay.
For engineers reviewing the LTC2445CUHF#TRPBF datasheet, LTC2445CUHF#TRPBF pinout, LTC2445CUHF#TRPBF application, or LTC2445CUHF#TRPBF equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, application-specific implementation value, and two confirmed alternative parts with documented functional and application-level differences.
Technical Context
The LTC2445CUHF#TRPBF implements a proprietary third-order delta-sigma modulator with decimating FIR filtering and per-conversion auto-calibration for offset and full-scale - enabling true no-latency operation where the first result after channel/speed change is accurate. It supports both internal and external clocking via FO and EXT pins, with 1X (no latency) and 2X (one-cycle latency) modes.
Its analog front-end accepts differential inputs with GND-to-VCC common-mode range independent of reference, and features MUXOUTP/ADCINP/MUXOUTN/ADCINN terminals to support external buffering - a distinguishing feature versus the LTC2444 family that improves noise performance by √2 (≈0.5 effective bits) at matched OSR settings.
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 | 2 µV at 1.76 kHz output rate - enables sub-10 ppm measurement precision in fast industrial scanning. |
| INL Error | ±0.0005% (±5 ppm of VREF) - ensures linearity-critical applications like auto-ranging DVMs meet Class I accuracy. |
| Offset Error | <5 µV (4.5V ≤ VCC ≤ 5.5V, –40°C to 85°C) - eliminates need for system-level offset trimming in low-drift sensor interfaces. |
| Input Channels | 8 single-ended or 4 differential - supports multiplexed thermocouple, strain gauge, or RTD arrays without external mux IC. |
| Reference Range | 0.1 V to VCC differential - allows flexible scaling from 1.25 V to 5 V references while maintaining full 24-bit dynamic range. |
| Supply Current | 8–11 mA active, 20 µA autosleep at 6.9 Hz - enables battery-backed portable instrumentation with >1-year runtime. |
Pinout & Package
38-lead (5 mm × 7 mm) plastic QFN package with exposed thermal pad (Pin 39 = GND). All seven ground pins (1, 4, 5, 6, 31, 32, 33) must be soldered to PCB ground plane for proper decoupling and noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (1,4,5,6,31,32,33) | Ground reference | Multiple dedicated GND pins minimize ground bounce and enable clean separation of analog/digital return paths. |
| BUSY (2) | Conversion status indicator | Active-HIGH signal shows conversion progress; transitions LOW when 32-bit result is ready for readout. |
| EXT (3) | SCK mode select | Logic HIGH enables internal SCK generation on Pin 38; LOW configures SCK as external clock input. |
| COM (7) | Common negative input | Shared IN– for all single-ended channels; supports bipolar input range up to ±0.5×VREF. |
| CH0–CH7 (9,10,13,14,17,18,21,22) | Analog input channels | Configurable as single-ended or differential pairs (e.g., CH0+/CH1–); full GND-to-VCC common-mode range. |
| MUXOUTP/N (24,27) | Multiplexer outputs | Drive external buffer/amplifier; enable gain/level-shifting before ADC input without degrading noise or linearity. |
| ADCINP/N (25,26) | ADC analog inputs | Accept buffered signals from MUXOUTP/N; internal calibration removes external amplifier offset errors. |
| VCC (28), REF+ (29), REF– (30) | Power and reference | Differential reference supports 0.1 V–5.5 V range; VCC requires 4.5 V–5.5 V with local 10 µF + 0.1 µF bypass. |
| SDI (34), FO (35), CS (36), SDO (37), SCK (38) | 4-wire SPI interface | CS-active-low enables serial readout; SDI configures channel/speed/resolution; BUSY and SDO share pin during sleep/conversion. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma architecture | First conversion after channel/speed change is fully accurate - eliminates dead time and settling delays in multiplexed systems. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction over temperature, supply, and time - removes need for periodic system recalibration. |
| MUXOUT/ADCIN signal path | Enables external gain/buffering with automatic cancellation of amplifier offset - preserves 24-bit integrity without manual trimming. |
| Simultaneous 50 Hz/60 Hz rejection | Guaranteed at 6.9 Hz output rate - eliminates mains interference in weigh scales and laboratory instruments without notch filters. |
| Autosleep mode | Reduces current to 20 µA at 6.9 Hz output - extends battery life in portable test equipment and remote sensors. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
Use Scenario: High-resolution load cell readout in commercial bench scales with 100,000-count resolution and <1 µV sensitivity. IC Role / Device Role / Timing Role: Primary 24-bit ADC performing sequential channel scans of bridge sensors with real-time offset compensation. Use Value: Simultaneous 50/60 Hz rejection at 6.9 Hz output rate eliminates AC line noise without software filtering, preserving measurement throughput. | Use Scenario: Precision multimeter supporting autoranging across 100 mV to 1000 V ranges with <10 ppm linearity and zero drift. IC Role / Device Role / Timing Role: Core metrology ADC with programmable OSR and internal reference tracking for seamless range switching. Use Value: ±0.0005% INL and <5 µV offset error ensure Class I DVM compliance without factory calibration offsets. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
Use Scenario: Cold-junction-compensated thermocouple system measuring –200°C to +1800°C with 0.1°C resolution using K-type sensors. IC Role / Device Role / Timing Role: Differential ADC digitizing thermocouple voltage and reference junction sensor simultaneously via CH0/CH1. Use Value: GND-to-VCC common-mode input range allows direct connection to grounded thermocouple leads without level-shifting circuitry. | Use Scenario: Industrial PLC analog input module acquiring 8 sensor channels (pressure, flow, position) at ≥500 Hz aggregate scan rate. IC Role / Device Role / Timing Role: Channel-multiplexed ADC operating in 1X mode with 2 µVRMS noise at 1.76 kHz output rate. Use Value: No-latency architecture enables valid first-sample accuracy after each channel switch - no discarded readings or timing guard bands required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1256IPWT | 24-bit, 8-channel, but uses external crystal; no built-in 50/60 Hz rejection; higher typical noise (3.8 µVRMS at 30 kSPS). | Requires external clock and digital filtering for mains rejection; less suitable for standalone portable instruments. | Select when board space allows crystal layout and system firmware can implement digital notch filtering. |
| LTC2449CUHF#TRPBF | 16-channel (8-differential) variant of same family; identical noise, INL, and MUXOUT/ADCIN architecture; larger pin count. | Supports double the input count for multi-sensor systems; requires revised PCB layout and channel mapping logic. | Select when expanding from 4- to 8-differential channels without changing signal chain topology or calibration strategy. |
Compared with ADS1256IPWT, LTC2445CUHF#TRPBF delivers guaranteed 50/60 Hz rejection and lower noise without external components; compared with LTC2449CUHF#TRPBF, it offers identical performance in half the channel count - simplifying layout and reducing BOM cost where 4 differential inputs suffice.
Availability
LTC2445CUHF#TRPBF is available at Aetrix Electronics and suitable for weight scales, auto-ranging DVMs, direct temperature measurement, and high-speed data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2445CUHF#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC244x family was designed for high-accuracy, multiplexed industrial measurement systems requiring no-latency conversion, integrated calibration, and robust noise immunity - especially where external filtering or trimming is impractical.
FAQ
What is the maximum output data rate of the LTC2445CUHF#TRPBF with external oscillator?
The LTC2445CUHF#TRPBF achieves up to 8 kHz output rate when an external oscillator is applied to the FO pin. This is enabled in 2X speed mode with external clocking, delivering one-cycle latency. At 1X mode with external oscillator, the maximum rate is 4 kHz - both configurations maintain full 24-bit resolution and guaranteed modulator stability across all input and reference conditions.
Does the LTC2445CUHF#TRPBF require external components for basic operation?
No, the LTC2445CUHF#TRPBF operates fully autonomously with only VCC bypass capacitors (10 µF tantalum + 0.1 µF ceramic) and optional external reference. Its internal oscillator eliminates need for crystals or RC networks, and MUXOUT/ADCIN pins allow optional external buffering without mandatory components. The device performs continuous auto-calibration without user intervention.
How does the MUXOUT/ADCIN feature improve system accuracy in the LTC2445CUHF#TRPBF?
The MUXOUT/ADCIN feature in the LTC2445CUHF#TRPBF enables insertion of an external op-amp between multiplexer output and ADC input. Because the LTC2445CUHF#TRPBF performs per-conversion offset calibration, it automatically cancels the DC offset of the external amplifier - preserving 24-bit linearity and eliminating manual trim circuits or calibration routines otherwise needed for gain stages.
What is the guaranteed input common-mode rejection ratio (CMRR) of the LTC2445CUHF#TRPBF?
The LTC2445CUHF#TRPBF provides minimum 120 dB DC input common-mode rejection, specified over full temperature range. This is achieved through matched front-end transistor pairs and symmetrical layout - critical for rejecting noise in noisy industrial environments where sensor grounds differ from system ground.
Can the LTC2445CUHF#TRPBF operate with a 3.3 V supply?
No, the LTC2445CUHF#TRPBF requires VCC between 4.5 V and 5.5 V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation below 4.5 V risks undefined behavior, failed calibration cycles, or violation of timing specifications - it is not rated or characterized for 3.3 V operation.
LTC2445CUHF#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:
- -
LTC2445CUHF#TRPBF FAQ
1.How can I place an order for LTC2445CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2445CUHF#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 LTC2445CUHF#TRPBF reliable?
The price and inventory of LTC2445CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2445CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2445CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2445CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2445CUHF#TRPBF?
LTC2445CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2445CUHF#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 LTC2445CUHF#TRPBF?
For technical support, including LTC2445CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2445CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2445CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2445CUHF#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 LTC2445CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2445CUHF#TRPBF?
All LTC2445CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2445CUHF#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 LTC2445CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2445CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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