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Analog Devices Inc. LTC2445IUHF#TRPBF
- Part No.:
- LTC2445IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2445IUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,963
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Product details
Overview
LTC2445IUHF#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, 0.0005% INL, and differential input/reference support. It operates from 4.5 V to 5.5 V and targets high-precision industrial data acquisition systems requiring simultaneous 50 Hz/60 Hz rejection.
For engineers reviewing the LTC2445IUHF#TRPBF datasheet, LTC2445IUHF#TRPBF pinout, LTC2445IUHF#TRPBF application, or LTC2445IUHF#TRPBF equivalent, key selection criteria include guaranteed modulator stability under all input/reference conditions, autosleep mode enabling 20 µA operation at 6.9 Hz, and MUXOUT/ADCIN pins for external buffering without calibration penalty.
Technical Context
The LTC2445IUHF#TRPBF implements 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-no settling delay or DC shift in offset, linearity, or drift.
It supports both internal oscillator (no external components) and external fO up to 12 MHz, enabling output rates from 6.9 Hz to 8 kHz. The 4-wire SPI-compatible interface uses BUSY as framing signal and allows seamless 1X/2X speed mode switching via SDI bit control without interrupting cyclic operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes-guaranteed monotonicity across full input range. |
| INL | ±0.0005% of VREF (±12 ppm)-enables 6½-digit DVM-grade accuracy without post-calibration. |
| RMS Noise | 2 µV at 1.76 kHz output rate; 200 nV at 13.8 Hz with simultaneous 50/60 Hz rejection-supports direct thermocouple measurement. |
| Offset Error | <5 µV (4.5 V ≤ VCC ≤ 5.5 V, –40°C to 85°C)-minimizes zero-point drift in weight scale front-ends. |
| Supply Current | 8–11 mA in conversion mode; 20 µA in autosleep at 6.9 Hz-enables battery-powered portable instrumentation. |
| Input Range | Differential ±0.5 × VREF; common-mode from GND to VCC-simplifies sensor interfacing without level-shifting. |
| Reference Range | 0.1 V to VCC differential; REF+ and REF– each tolerate GND to VCC-supports ratiometric or precision reference topologies. |
Pinout & Package
Package: 38-lead (5 mm × 7 mm) plastic QFN (UHF), exposed pad (Pin 39) soldered to PCB ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 4, 5, 6, 31, 32, 33) | Ground return | Seven dedicated ground pins ensure low-impedance return paths for analog, digital, and power domains-critical for 24-bit noise performance. |
| BUSY (Pin 2) | Conversion status indicator | Active-HIGH during conversion; transitions LOW when 32-bit result is ready-serves as hardware-ready handshake for microcontroller polling. |
| EXT (Pin 3) | SCK mode select | Logic HIGH enables internal SCK generation on Pin 38; LOW configures SCK as external clock input-no register writes required. |
| COM (Pin 7) | Common negative input | Shared IN– for all single-ended channels; voltage range GND–0.3 V to VCC+0.3 V-enables true rail-to-rail common-mode operation. |
| CH0–CH7 (Pins 9, 10, 13, 14, 17, 18, 21, 22) | Analog input channels | Support programmable single-ended or differential pairing (e.g., CH0+/CH1–); each pair referenced to COM or another channel. |
| MUXOUTP/N (Pins 24, 27) | Multiplexer outputs | Drive external buffer/amplifier; enable gain/conditioning before ADC input-calibration automatically compensates buffer offset. |
| ADCINP/N (Pins 25, 26) | ADC input terminals | Accept buffered signal from MUXOUT; isolated from multiplexer switching transients-preserves SNR in high-gain sensor interfaces. |
| REF+/REF– (Pins 29, 30) | Differential reference inputs | Accept 0.1 V to VCC differential reference; common-mode range GND to VCC-supports ratiometric sensors or precision references. |
| SDI/SDO/SCK/CS/FO (Pins 34–38, 35) | 4-wire serial interface | Standard SPI-like protocol with BUSY framing; FO selects internal/external oscillator; CS controls sleep/wake-no configuration registers needed. |
Key Features
| Feature | Design Value |
|---|---|
| No latency mode | 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 <5 µV offset drift over temperature and supply variation without user intervention. |
| MUXOUT/ADCIN architecture | External buffer inserted between mux and ADC-enables single amplifier for all 8 channels while preserving 24-bit linearity via transparent calibration. |
| Simultaneous 50 Hz/60 Hz rejection | Guaranteed at 6.9 Hz output rate-removes mains interference in laboratory and industrial environments without notch filters. |
| Autosleep at 6.9 Hz | 20 µA quiescent current-extends battery life in portable DMMs and handheld test equipment. |
Applications
| Weight Scales | Auto-Ranging 6-Digit DVMs |
|---|---|
Use Scenario: High-resolution load cell readout in commercial and industrial weighing systems requiring OIML R76 compliance. IC Role / Device Role / Timing Role: Primary 24-bit ADC capturing differential bridge output with 200 nVRMS noise floor and simultaneous 50/60 Hz rejection. Use Value: Enables 1:1,000,000 resolution at 6.9 Hz without external filtering or firmware averaging-reduces BOM cost and firmware complexity. |
Use Scenario: Precision benchtop digital multimeter with automatic range selection and sub-ppm accuracy. IC Role / Device Role / Timing Role: Core metrology ADC handling DCV, ACV, and resistance measurements with programmable OSR from 256 to 32768. Use Value: 0.0005% INL and <5 µV offset error eliminate need for factory calibration trim-lowers production test time and cost. |
| Direct Temperature Measurement | High-Speed Data Acquisition |
Use Scenario: Cold-junction-compensated thermocouple interface in process control and environmental monitoring. IC Role / Device Role / Timing Role: 24-bit delta-sigma converter digitizing µV-level thermocouple EMF with integrated cold-junction sensing via COM pin. Use Value: 200 nVRMS noise at 13.8 Hz enables <0.1°C resolution for Type K thermocouples-meets ASTM E230 Class 2 accuracy. |
Use Scenario: Multi-channel sensor fusion in industrial IoT gateways sampling pressure, strain, and humidity simultaneously. IC Role / Device Role / Timing Role: 8-channel multiplexed ADC scanning all inputs at 500 Hz per channel in no-latency mode with 2 µVRMS noise. Use Value: Eliminates inter-channel crosstalk and settling delays-enables real-time FFT analysis without post-processing interpolation. |
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 fixed 30 kSPS max; no simultaneous 50/60 Hz rejection; requires external crystal; higher 15 µV offset. | Best suited for high-speed, lower-accuracy applications where mains rejection is handled externally. | Select if system already uses crystal-based timing and prioritizes throughput over ultra-low noise at low rates. |
| LTC2418CGN#PBF | 24-bit, 8-channel, but 1.5 µVRMS noise only at 7.5 Hz; no MUXOUT/ADCIN pins; no 2X speed mode; slower max multiplexing (250 Hz). | Ideal for cost-sensitive, lower-bandwidth applications where external buffering is unnecessary. | Choose when 6.9 Hz operation suffices and external amplification is not required-reduces component count. |
Compared with ADS1256IPW and LTC2418CGN#PBF, the LTC2445IUHF#TRPBF uniquely delivers 200 nVRMS noise with simultaneous 50/60 Hz rejection at 6.9 Hz, MUXOUT/ADCIN for calibrated external gain, and seamless 1X/2X speed switching-making it optimal for metrology-grade portable instruments.
Availability
LTC2445IUHF#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 LTC2445IUHF#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 ICs for precision measurement and control.
The LTC2445IUHF#TRPBF belongs to the LTC244x family of no-latency delta-sigma ADCs designed specifically for high-accuracy, multi-channel industrial data acquisition where calibration stability, noise performance, and ease of use are critical.
FAQ
What is the maximum output data rate of the LTC2445IUHF#TRPBF?
The LTC2445IUHF#TRPBF achieves up to 8 kHz output rate when using an external oscillator (fO = 12 MHz) in 2X speed mode. With its internal oscillator, the maximum is 7 kHz. At 6.9 Hz, it delivers 200 nVRMS noise with simultaneous 50/60 Hz rejection-critical for precision metrology applications requiring mains interference immunity.
Does the LTC2445IUHF#TRPBF require external components for basic operation?
No-the LTC2445IUHF#TRPBF includes an internal oscillator and requires only a 10 µF tantalum + 0.1 µF ceramic capacitor on VCC, plus standard decoupling. No external crystal, clock generator, or reference buffer is needed for default operation. MUXOUT/ADCIN pins are optional and used only when external signal conditioning is required.
How does the no-latency feature of the LTC2445IUHF#TRPBF improve system performance?
The no-latency feature ensures the first conversion result after any channel, speed, or resolution change is fully accurate-no settling delay or DC shift in offset, linearity, or drift. This enables reliable 500 Hz scanning across all 8 differential channels without inter-conversion dead time, simplifying firmware and eliminating post-acquisition correction algorithms in the LTC2445IUHF#TRPBF design.
What is the function of the MUXOUT and ADCIN pins on the LTC2445IUHF#TRPBF?
MUXOUTP/N (Pins 24, 27) output the selected channel's signal pre-ADC; ADCINP/N (Pins 25, 26) accept the conditioned signal back into the ADC. This allows insertion of a single external buffer/amplifier for all 8 channels. Crucially, the LTC2445IUHF#TRPBF's continuous auto-calibration removes the buffer's offset and gain errors-preserving 24-bit accuracy without manual trimming.
Can the LTC2445IUHF#TRPBF operate with a 2.5 V reference voltage?
Yes-the LTC2445IUHF#TRPBF accepts differential reference voltages from 0.1 V to VCC. With VCC = 5 V, a 2.5 V reference is fully supported. Input range becomes ±1.25 V differential, and INL improves due to reduced reference-dependent nonlinearity-verified in Electrical Characteristics tables where INL is specified at both 2.5 V and 5 V REF.
LTC2445IUHF#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2445IUHF#TRPBF FAQ
1.How can I place an order for LTC2445IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2445IUHF#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 LTC2445IUHF#TRPBF reliable?
The price and inventory of LTC2445IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2445IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2445IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2445IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2445IUHF#TRPBF?
LTC2445IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2445IUHF#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 LTC2445IUHF#TRPBF?
For technical support, including LTC2445IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2445IUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2445IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2445IUHF#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 LTC2445IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2445IUHF#TRPBF?
All LTC2445IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2445IUHF#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 LTC2445IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2445IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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