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Analog Devices Inc. LTC2481CDD#TRPBF
- Part No.:
- LTC2481CDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2481CDD#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,378
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Product details
Overview
LTC2481CDD#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit plus sign No Latency ΔΣ analog-to-digital converter with patented Easy Drive input current cancellation, I²C interface, and on-chip programmable gain (1–256). It digitizes rail-to-rail differential inputs with zero net differential input current, supports 50Hz/60Hz/combined line-frequency rejection, and operates from 2.7V to 5.5V supply. It is used in high-accuracy sensor digitization for industrial weight scales and strain gauge transducers.
For engineers reviewing the LTC2481CDD#TRPBF datasheet, LTC2481CDD#TRPBF pinout, LTC2481CDD#TRPBF application, or LTC2481CDD#TRPBF equivalent, key selection criteria include its 2 ppm INL, 1 µV offset error, 0.6 µVRMS noise (normal speed), 10-lead DFN package with exposed pad, and support for direct high-impedance sensor interfacing without external buffering.
Technical Context
The LTC2481CDD#TRPBF implements a third-order delta-sigma modulator with automatic offset and full-scale calibration, enabling true no-latency operation-digital filter settles in a single conversion cycle. Its Easy Drive architecture cancels dynamic input current via correlated double sampling, eliminating errors from source impedance mismatch.
It integrates an on-chip trimmed oscillator (307.2 kHz nominal), supports external clock input on CA0/f0, and provides six I²C slave addresses via CA0/f0 and CA1 pins. Programmable rejection modes target 50 Hz, 60 Hz, or simultaneous 50/60 Hz interference-critical for AC mains–coupled industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit plus sign, no missing codes-guarantees monotonicity and full code coverage across full input range. |
| INL | 2 ppm of VREF (0.25 LSB at 5V reference)-enables sub-µV-level precision in DC-critical applications like load cell readout. |
| Offset Error | ±0.5 µV (typ), ±2.5 µV (max) over temperature-supports ultra-low-drift measurements without system-level trimming. |
| Output Noise | 0.6 µVRMS (normal speed, VREF = 5V)-allows 19.5 effective bits at 7.5 SPS with GAIN = 256. |
| Input Common Mode Range | GND to VCC, independent of reference voltage-permits direct interfacing with sensors operating at arbitrary common-mode levels. |
| I²C Interface Speed | Up to 400 kHz Fast-mode-enables rapid configuration and data retrieval without CPU overhead. |
| Supply Voltage | 2.7 V to 5.5 V-compatible with both 3.3 V and 5 V industrial logic domains. |
Pinout & Package
Package: 10-lead (3 mm × 3 mm) plastic DFN with exposed pad (Pin 11), RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+ / REF− | Differential reference inputs | Accept 0.1 V to VCC reference span; common-mode range independent of VREF; enables ratiometric or absolute measurement flexibility. |
| IN+ / IN− | Differential analog inputs | Rail-to-rail input range (GND − 0.3 V to VCC + 0.3 V); zero net differential input current enables direct connection to >100 kΩ sensor sources. |
| VCC | Positive supply | 2.7 V to 5.5 V operation; requires local 1 µF tantalum + 0.1 µF ceramic bypass to GND (Pin 8) for noise immunity. |
| GND | Analog/digital ground | Exposed pad (Pin 11) must be soldered to PCB ground plane for thermal and electrical performance; low-impedance return path essential for <1 ppm accuracy. |
| SCL / SDA | I²C serial interface | Open-drain SDA requires external pull-up; SCL is input-only; supports Standard- and Fast-mode up to 400 kHz; no bus arbitration required (slave-only). |
| CA0/f0 / CA1 | I²C address control / external clock input | Two-pin address selection yields six unique I²C addresses; CA0/f0 doubles as external oscillator input (10–1000 kHz) for custom rejection frequency tuning. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive™ input current cancellation | Eliminates dynamic input bias current errors-enables accurate digitization of high-impedance sensors (e.g., thermistors, bridge transducers) without external op-amp buffering. |
| No latency ΔΣ architecture | Digital filter settles in one conversion cycle-provides immediate valid output after each START condition, critical for real-time closed-loop control. |
| Programmable line-frequency rejection | Selectable 50 Hz, 60 Hz, or simultaneous 50/60 Hz notch filtering-rejects mains-induced noise without external filters or DSP post-processing. |
| On-chip oscillator + external clock option | Internal 307.2 kHz oscillator eliminates crystal cost and layout area; CA0/f0 accepts external clock for precise rejection frequency alignment (e.g., fEOSC/5120 null placement). |
| Autocalibration engine | Continuous transparent offset and full-scale calibration-maintains 2 ppm INL and 1 µV offset stability over time and temperature without user intervention. |
Applications
| Weight Scales | Strain Gauge Transducers |
|---|---|
|
Use Scenario: High-resolution digital weighing systems measuring loads from grams to tons using Wheatstone bridge sensors. IC Role / Device Role / Timing Role: Direct bridge output digitizer with programmable gain and 50/60 Hz rejection to suppress ambient AC interference. Use Value: Achieves ≤1 µV offset drift and 0.6 µVRMS noise-enabling 20,000+ count resolution without external amplification or filtering. |
Use Scenario: Industrial force and pressure sensing where strain gauges operate with high source impedance (>10 kΩ) and low signal amplitude. IC Role / Device Role / Timing Role: Rail-to-rail ADC with zero differential input current, eliminating loading errors on unbuffered bridge outputs. Use Value: Enables direct connection to 350 Ω or 1 kΩ gauges at full scale-reducing BOM count and improving long-term stability vs. op-amp-based front ends. |
| Direct Temperature Measurement | Industrial Process Control |
|
Use Scenario: Precision temperature monitoring using PT100/PT1000 RTDs or thermistors in HVAC, lab equipment, and environmental chambers. IC Role / Device Role / Timing Role: Digitizer with internal temperature sensor and programmable gain for ratiometric or absolute sensing configurations. Use Value: 1 µV offset and 2 ppm INL allow <0.01 °C resolution with 4-wire RTD interfaces-meeting Class A IEC 60751 requirements. |
Use Scenario: Analog input modules in PLCs and distributed I/O systems requiring high-accuracy, low-power, and noise-immune signal acquisition. IC Role / Device Role / Timing Role: Low-power ADC with sleep mode (1 µA) and I²C interface for multi-channel, isolated sensor node architectures. Use Value: 160 µA active current and 1 µA sleep current extend uptime in battery-backed or energy-harvested nodes while maintaining 16-bit integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPW | 24-bit resolution, integrated PGA (1–128), but no Easy Drive; requires external reference; higher power (310 µA active) | Better resolution for ultra-low-level signals, but lacks inherent high-Z input cancellation-needs external buffer for >10 kΩ sources | Choose ADS124S08IPW when 24-bit resolution is mandatory and sensor source impedance is low (<1 kΩ); prefer LTC2481CDD#TRPBF for direct high-Z sensor digitization. |
| MAX11200EEE+ | 24-bit, 1 µV offset, but fixed 1× gain only; no line-frequency rejection; SPI interface only | Lacks programmable rejection and I²C compatibility-requires additional digital filtering and interface translation in I²C-based systems | Choose MAX11200EEE+ for SPI-based designs needing lowest possible offset; LTC2481CDD#TRPBF is superior for I²C systems requiring built-in 50/60 Hz rejection and gain flexibility. |
Compared with ADS124S08IPW and MAX11200EEE+, the LTC2481CDD#TRPBF uniquely combines zero-differential-input-current operation, integrated line-frequency rejection, and I²C compatibility in a 10-lead DFN-making it optimal for space-constrained, high-Z sensor nodes where system-level noise immunity and minimal external components are critical.
Availability
LTC2481CDD#TRPBF is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and weight scale applications requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for LTC2481CDD#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 technologies.
The LTC2481CDD#TRPBF belongs to Linear's precision delta-sigma ADC product line, designed specifically for direct sensor digitization in noise-sensitive industrial and instrumentation applications where input buffering, external clocks, and complex filtering must be minimized.
FAQ
What is the operating temperature range of the LTC2481CDD#TRPBF?
The LTC2481CDD#TRPBF is rated for 0°C to 70°C ambient operation-the "C" grade designation confirms commercial temperature range compliance. This makes it suitable for indoor industrial equipment, test instruments, and consumer-grade precision measurement devices where extended temperature extremes are not required. The device maintains specified INL, offset, and noise performance across this full range.
Does the LTC2481CDD#TRPBF require an external crystal or oscillator?
No, the LTC2481CDD#TRPBF includes an on-chip trimmed oscillator operating at 307.2 kHz (nominal), eliminating the need for external timing components in standard configurations. However, Pin 10 (CA0/f0) supports optional external clock input (10–1000 kHz) for custom line-frequency rejection tuning-e.g., aligning the digital filter null precisely to local mains frequency deviations.
How does the Easy Drive technology in the LTC2481CDD#TRPBF improve sensor interface performance?
Easy Drive technology in the LTC2481CDD#TRPBF cancels differential input current through correlated double sampling, resulting in near-zero net current flow into IN+ and IN−. This allows direct connection to high-impedance sensors (e.g., thermistors, unbuffered strain gauges) without gain error or offset drift caused by source impedance mismatch-preserving DC accuracy even with >100 kΩ source impedances.
Can the LTC2481CDD#TRPBF reject both 50 Hz and 60 Hz interference simultaneously?
Yes, the LTC2481CDD#TRPBF supports a simultaneous 50 Hz/60 Hz rejection mode-configurable via I²C-where the digital filter places nulls at both frequencies. This is especially valuable in globally deployed equipment or portable instruments that may encounter either mains standard, ensuring robust noise immunity without hardware or firmware reconfiguration.
What is the maximum achievable output data rate for the LTC2481CDD#TRPBF?
The LTC2481CDD#TRPBF offers a 2× speed mode that reduces conversion time by ~50% versus normal mode-for example, from 157.2 ms to 78.7 ms in 50 Hz rejection mode. While this increases RMS noise to 0.84 µVRMS, it enables faster sampling for dynamic measurements, achieving up to ~12.7 samples per second in combined 50/60 Hz mode with GAIN = 1.
LTC2481CDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- I2C
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- PGA, Selectable Address, Temperature Sensor
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2481CDD#TRPBF FAQ
1.How can I place an order for LTC2481CDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2481CDD#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 LTC2481CDD#TRPBF reliable?
The price and inventory of LTC2481CDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2481CDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2481CDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2481CDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2481CDD#TRPBF?
LTC2481CDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2481CDD#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 LTC2481CDD#TRPBF?
For technical support, including LTC2481CDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2481CDD#TRPBF requirements.
6.How does Aetrix verify that LTC2481CDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2481CDD#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 LTC2481CDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2481CDD#TRPBF?
All LTC2481CDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2481CDD#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 LTC2481CDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC2481CDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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