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Analog Devices Inc. LTC2481IDD#TRPBF
- Part No.:
- LTC2481IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2481IDD#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,405
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Product details
Overview
LTC2481IDD#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit plus sign no-latency delta-sigma 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 differential input current, supports 50 Hz/60 Hz simultaneous line rejection, and operates from 2.7 V to 5.5 V. It is used in high-accuracy sensor digitization for industrial weight scales and strain gauge transducers.
For engineers reviewing the LTC2481IDD#TRPBF datasheet, LTC2481IDD#TRPBF pinout, LTC2481IDD#TRPBF application, or LTC2481IDD#TRPBF equivalent, key selection considerations include its 2 ppm INL, 1 µV offset error, 10-Lead DFN (3 mm × 3 mm) package, internal oscillator eliminating external crystals, and support for six I²C addresses plus global sync - all critical for low-drift, high-impedance sensor interfacing in space-constrained industrial systems.
Technical Context
The LTC2481IDD#TRPBF implements a third-order delta-sigma modulator with automatic offset and full-scale calibration, enabling true no-latency operation where digital filter settles in one cycle. Its Easy Drive sampling scheme cancels differential input current dynamically, allowing direct connection of high-source-impedance sensors without external buffering.
It features dual-speed operation (1× and 2×), programmable line-frequency rejection (50 Hz, 60 Hz, or simultaneous), and an internal trimmed oscillator (307.2 kHz typical) - all configurable via I²C. The reference voltage range is 0.1 V to VCC, and common-mode input range spans GND to VCC, independent of reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit plus sign, no missing codes - guarantees monotonicity and full code coverage over full input range. |
| INL | 2 ppm (0.25 LSB) max - enables sub-µV-level precision in DC-critical applications like load cell readouts. |
| Offset Error | ±0.5 µV typical (–40°C to +85°C) - eliminates need for system-level offset trimming in high-stability designs. |
| Full-Scale Error | ±25 ppm of VREF - ensures accurate scaling across temperature without recalibration. |
| Input Common-Mode Rejection | 140 dB DC and at 50/60 Hz - rejects ground noise and supply coupling in noisy industrial environments. |
| I²C Interface Speed | Up to 400 kHz Fast-mode - supports rapid configuration and data readout without MCU timing overhead. |
| Supply Current (Conv.) | 160 µA typical (2.7–5.5 V) - enables battery-powered or energy-harvesting sensor nodes. |
Pinout & Package
Package: 10-Lead (3 mm × 3 mm) Plastic DFN (DD), exposed pad soldered to PCB ground for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+, REF– | Differential reference inputs | Accept 0.1 V to VCC reference span; enable ratiometric or absolute measurements with flexible reference sourcing. |
| IN+, IN– | Differential analog inputs | Rail-to-rail common-mode range (GND to VCC) with zero differential input current - directly interface thermistors, bridges, and RTDs. |
| VCC, GND | Power supply terminals | Support 2.7 V–5.5 V operation; require local 1 µF tantalum + 0.1 µF ceramic bypass for stable conversion performance. |
| SCL, SDA | I²C serial clock and bidirectional data | Open-drain SDA requires external pull-up; supports multi-drop bus with six unique slave addresses and global sync command. |
| CA0/f0, CA1 | Chip address control / external clock input | Set I²C address bits via resistive pull-up/down/floating; CA0/f0 doubles as external oscillator input (10–1000 kHz). |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive Input Current Cancellation | Eliminates dynamic input current errors - enables direct digitization of sensors with >100 kΩ source impedance while maintaining DC accuracy. |
| Programmable Gain (1–256) | Eight discrete gain steps selectable via I²C - optimizes dynamic range for microvolt-level signals without external amplifiers. |
| Simultaneous 50 Hz/60 Hz Rejection | Single conversion cycle rejects both line frequencies - essential for global instrumentation deployed in mixed-grid regions. |
| No-Latency Digital Filter | Settles in one cycle - delivers valid conversion result immediately after read command, simplifying real-time control loop timing. |
| Internal Trimmed Oscillator | 307.2 kHz typical (no external crystal required) - reduces BOM count, board area, and startup time in cost- and space-sensitive designs. |
Applications
| Weight Scales | Strain Gauge Transducers |
|---|---|
|
Use Scenario: High-resolution weighing of industrial loads using Wheatstone bridge-based load cells with mV/V output. IC Role / Device Role / Timing Role: Direct bridge digitizer with 24-bit output, programmable gain, and line-frequency rejection to suppress AC mains interference. Use Value: Achieves <10 µg resolution at 10 kg full scale without external instrumentation amplifier or notch filters. |
Use Scenario: Structural health monitoring of bridges or machinery using bonded foil strain gauges under varying ambient EMI. IC Role / Device Role / Timing Role: Low-drift, high-common-mode-rejection ADC capturing microstrain-level differential signals in noisy factory environments. Use Value: 140 dB CMRR and 2 ppm INL maintain ±0.005% full-scale accuracy across –40°C to +85°C operating range. |
| Direct Temperature Measurement | Industrial Process Control |
|
Use Scenario: Precision RTD or thermistor readout in HVAC or pharmaceutical process sensors requiring NIST-traceable stability. IC Role / Device Role / Timing Role: Ratiometric ADC with internal temperature sensor and programmable reference - enables self-calibrated cold-junction compensation. Use Value: 1 µV offset drift and on-chip autocalibration eliminate annual field recalibration for Class A RTD compliance. |
Use Scenario: Analog input module in PLC backplane digitizing 4–20 mA loop signals and sensor outputs with galvanic isolation. IC Role / Device Role / Timing Role: Isolated-side ADC with I²C interface, low power sleep mode (1 µA), and robust ESD-tolerant pins. Use Value: 160 µA active current and 1 µA sleep current extend isolated power budget; I²C simplifies SPI-to-I²C bridge integration. |
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 buffer for >10 kΩ sources. | Higher resolution but lower input impedance tolerance; better for low-noise, low-Z sensor arrays. | Select when 24-bit resolution outweighs need for ultra-high-Z direct sensor interface. |
| MAX11206ETN+ | 20-bit resolution, 1.8–3.6 V supply only, no simultaneous 50/60 Hz rejection - single-frequency notch only. | Lower power (120 µA) but narrower voltage range and reduced line-rejection flexibility. | Select for battery-powered portable instruments where supply voltage is fixed ≤3.6 V. |
Compared with ADS124S08IPW and MAX11206ETN+, the LTC2481IDD#TRPBF uniquely combines 16-bit precision with zero differential input current, simultaneous dual-line rejection, and 2.7–5.5 V operation - making it optimal for universal industrial sensor digitizers where source impedance and grid compatibility are primary constraints.
Availability
LTC2481IDD#TRPBF is available at Aetrix Electronics and suitable for industrial process control, precision weight scales, and strain gauge transducer systems requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.
Supply support for LTC2481IDD#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 semiconductors.
The LTC2481IDD#TRPBF belongs to Linear's precision delta-sigma ADC family, designed specifically for direct high-impedance sensor digitization in industrial, test & measurement, and medical instrumentation where DC accuracy and noise immunity are critical.
FAQ
What is the operating temperature range of the LTC2481IDD#TRPBF?
The LTC2481IDD#TRPBF is rated for –40°C to +85°C operation, matching the "I" grade designation in its part number. This extended industrial temperature range ensures reliable performance in factory automation, outdoor instrumentation, and motor control enclosures where ambient temperatures fluctuate widely. All key specifications - including offset error, INL, and line rejection - are guaranteed across this full range.
Does the LTC2481IDD#TRPBF require an external crystal or oscillator?
No, the LTC2481IDD#TRPBF includes an on-chip trimmed oscillator (typically 307.2 kHz) that eliminates the need for external timing components. This internal oscillator supports all standard rejection modes (50 Hz, 60 Hz, simultaneous) and enables immediate operation after power-up. An external clock can be applied to the CA0/f0 pin if precise frequency control or synchronization is required, but it is not mandatory for basic functionality.
How does Easy Drive technology benefit sensor interfacing in the LTC2481IDD#TRPBF?
Easy Drive technology in the LTC2481IDD#TRPBF automatically cancels differential input current during sampling, resulting in near-zero net current flow into IN+ and IN– pins. This allows direct connection of high-impedance sensors - such as thermistors (>100 kΩ), RTDs, or unbuffered strain gauges - without external op-amps or passive filtering, preserving signal integrity and reducing system noise, cost, and board area.
Can the LTC2481IDD#TRPBF reject both 50 Hz and 60 Hz line noise simultaneously?
Yes, the LTC2481IDD#TRPBF supports simultaneous 50 Hz/60 Hz rejection in a single conversion cycle. This is achieved through its proprietary digital filter architecture, which places nulls at both frequencies without increasing conversion time. This capability is especially valuable for global instrumentation deployed across regions with differing AC mains standards, ensuring consistent noise immunity without firmware reconfiguration.
What I²C address options are available for the LTC2481IDD#TRPBF?
The LTC2481IDD#TRPBF supports six unique I²C slave addresses via two address pins (CA1 and CA0/f0), each configurable as LOW, HIGH, or floating - yielding 3 × 2 = 6 combinations. Additionally, it responds to a global address (0x00) for synchronized configuration or reset across multiple devices on the same bus, simplifying multi-ADC system initialization and calibration sequencing.
LTC2481IDD#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2481IDD#TRPBF FAQ
1.How can I place an order for LTC2481IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2481IDD#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 LTC2481IDD#TRPBF reliable?
The price and inventory of LTC2481IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2481IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2481IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2481IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2481IDD#TRPBF?
LTC2481IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2481IDD#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 LTC2481IDD#TRPBF?
For technical support, including LTC2481IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2481IDD#TRPBF requirements.
6.How does Aetrix verify that LTC2481IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2481IDD#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 LTC2481IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2481IDD#TRPBF?
All LTC2481IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2481IDD#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 LTC2481IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC2481IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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