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Analog Devices Inc. LTC2481IDD#PBF
- Part No.:
- LTC2481IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2481IDD#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:935
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Product details
Overview
LTC2481IDD#PBF from Analog Devices (acquired 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 precision weight scales and strain gauge transducers requiring high DC accuracy with high-impedance sensors.
For engineers reviewing the LTC2481IDD#PBF datasheet, LTC2481IDD#PBF pinout, LTC2481IDD#PBF application, or LTC2481IDD#PBF equivalent, key selection criteria include its 2ppm INL, 1ppm offset error, 10-Lead DFN (3mm × 3mm) package, –40°C to +85°C temperature grade, and support for internal/external oscillator clocking with programmable 2× speed mode.
Technical Context
The LTC2481IDD#PBF implements a third-order delta-sigma modulator with automatic offset and full-scale calibration, eliminating latency via single-cycle digital filter settling. Its Easy Drive architecture cancels dynamic input current errors by balancing differential sampling charge, enabling direct connection of high-source-impedance sensors without external buffering.
It integrates a trimmed on-chip oscillator (307.2 kHz nominal), supports six I²C slave addresses via CA0/f0 and CA1 pins, and provides programmable line-frequency rejection (50 Hz, 60 Hz, or simultaneous 50/60 Hz) through configurable digital filtering. The reference voltage range is 0.1 V to VCC, independent of common-mode input range (GND to VCC).
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) - ensures high linearity for precision measurement systems. |
| Offset Error | ±0.5 µV (typical) - enables sub-microvolt DC accuracy critical for low-level sensor signals. |
| Supply Range | 2.7 V to 5.5 V - supports battery-powered and industrial 3.3 V/5 V systems without level-shifting. |
| Line Rejection | 140 dB common-mode, 110 dB normal-mode at 50/60 Hz - suppresses mains interference in noisy environments. |
| Conversion Time | 131.0 ms (60 Hz mode, H-grade) - sets minimum sampling period for synchronized AC-line rejection. |
| Output Noise | 0.6 µVRMS (normal speed, VREF = 5 V) - defines effective resolution limit for low-noise applications. |
Pinout & Package
The LTC2481IDD#PBF is housed in a 10-Lead (3 mm × 3 mm) plastic DFN package with exposed pad (Pin 11, GND). Pin 11 must be 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; common-mode range independent of VREF. |
| IN+ / IN– | Differential analog inputs | Rail-to-rail common-mode (GND to VCC); Easy Drive eliminates net input current for high-Z sources. |
| VCC / GND | Power supply and ground | Require local 1 µF tantalum + 0.1 µF ceramic bypass; exposed pad is GND and must be connected. |
| SCL / SDA | I²C serial clock/data | Standard-mode/Fast-mode (≤400 kHz); SDA is open-drain - requires external pull-up. |
| CA0/f0 / CA1 | I²C address control / external clock input | Set slave address bits; CA0/f0 accepts external oscillator (10–1000 kHz) to override internal clock. |
Key Features
| Feature | Design Value |
|---|---|
| No Latency ΔΣ Conversion | Digital filter settles in one cycle - output data reflects latest conversion without pipeline delay. |
| Easy Drive Input Current Cancellation | Zero net differential input current - enables direct digitization of high-impedance bridges and thermistors without buffer op-amps. |
| Programmable Gain (1–256) | 8 discrete gain steps configured via I²C - adapts full-scale range to sensor output without external amplification. |
| Simultaneous 50/60 Hz Rejection | Single configuration rejects both line frequencies - simplifies global deployment in mixed-grid regions. |
| On-Chip Trimmed Oscillator | 307.2 kHz internal clock - eliminates external crystal, reducing BOM count and board area. |
Applications
| Weight Scales | Strain Gauge Transducers |
|---|---|
Use Scenario: High-precision platform or load-cell weighing in commercial/industrial scales. IC Role / Device Role / Timing Role: Direct digitizer of mV-level bridge outputs with 24-bit output including configuration status. Use Value: 2 ppm INL and 1 ppm offset error enable ≤0.001% full-scale accuracy without factory trimming. | Use Scenario: Structural health monitoring using bonded foil or MEMS strain gauges. IC Role / Device Role / Timing Role: Low-drift, high-common-mode-rejection ADC interfacing Wheatstone bridges with >100 kΩ source impedance. Use Value: Easy Drive eliminates input current-induced errors, preserving bridge balance and sensitivity. |
| Direct Temperature Measurement | Industrial Process Control |
Use Scenario: Cold-junction compensation and RTD/thermistor readout in HVAC or lab instruments. IC Role / Device Role / Timing Role: Digitizes PTAT internal sensor or external ratiometric temperature sensors with programmable gain. Use Value: Internal temperature sensor (390–450 mV at 27°C) provides system-level thermal monitoring without extra components. | Use Scenario: Analog input modules in PLCs and distributed I/O systems requiring EMC robustness. IC Role / Device Role / Timing Role: Precision front-end ADC with 140 dB line-frequency rejection for noisy factory environments. Use Value: Simultaneous 50/60 Hz rejection and 120 dB PSRR ensure stable readings despite variable power quality. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPW | 24-bit resolution, integrated PGA and burnout current sources; no Easy Drive; SPI interface only. | Requires external excitation for RTDs; lacks I²C and simultaneous 50/60 Hz rejection. | Choose for higher resolution and integrated diagnostics; avoid if I²C or zero-input-current operation is mandatory. |
| MAX11200EEE+ | 24-bit, no internal oscillator; external clock required; 128 kSPS max; no programmable line rejection. | Higher speed but no built-in 50/60 Hz filtering; requires external clock and reference. | Choose for high-speed precision acquisition; avoid when autonomous line-noise rejection or oscillator integration is needed. |
Compared with ADS124S08IPW and MAX11200EEE+, the LTC2481IDD#PBF uniquely combines I²C interface, Easy Drive input cancellation, and simultaneous 50/60 Hz rejection in a compact DFN package - making it optimal for space-constrained, high-impedance sensor interfaces where simplicity and noise immunity are prioritized over raw resolution or throughput.
Availability
LTC2481IDD#PBF is available at Aetrix Electronics and suitable for weight scales, strain gauge transducers, direct temperature measurement, and industrial process control requiring stable component supply across extended temperature ranges.
Supply support for LTC2481IDD#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, formed through the acquisition of Linear Technology in 2017.
The LTC2481IDD#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for high-accuracy, low-power sensor digitization in industrial, instrumentation, and weigh-scale applications where input current cancellation and line-frequency rejection are critical.
FAQ
What is the operating temperature range of the LTC2481IDD#PBF?
The LTC2481IDD#PBF is rated for –40°C to +85°C, corresponding to the "I" grade designation in the part number. This extended industrial temperature range ensures reliable operation in demanding environments such as factory automation and outdoor instrumentation where ambient temperatures fluctuate widely. The device maintains specified INL, offset, and line-rejection performance across this full range.
Does the LTC2481IDD#PBF require an external crystal or oscillator?
No, the LTC2481IDD#PBF includes a trimmed on-chip oscillator (nominal 307.2 kHz) that eliminates the need for external timing components in most applications. However, Pin 10 (CA0/f0) supports an external oscillator (10–1000 kHz) for precise clock control or custom line-frequency rejection tuning - useful when synchronizing multiple converters or meeting stringent EMI requirements.
How does Easy Drive technology benefit sensor interfacing in the LTC2481IDD#PBF?
Easy Drive technology in the LTC2481IDD#PBF automatically cancels differential input current during sampling, resulting in near-zero net current flow into IN+ and IN–. This allows direct connection of high-impedance sensors (e.g., load cells, thermistors, RTDs) without external op-amp buffers - preserving signal integrity, reducing component count, and avoiding buffer-induced drift or noise.
Can the LTC2481IDD#PBF reject both 50 Hz and 60 Hz noise simultaneously?
Yes, the LTC2481IDD#PBF supports a dedicated simultaneous 50 Hz/60 Hz rejection mode. When enabled via I²C configuration, its digital filter places nulls at both frequencies, achieving ≥87 dB rejection. This feature is especially valuable for global instrumentation deployed across regions with differing mains frequencies, eliminating the need for hardware variants or firmware reconfiguration.
What I²C addresses are supported by the LTC2481IDD#PBF?
The LTC2481IDD#PBF supports six unique I²C slave addresses determined by the logic states (LOW/HIGH/FLOAT) of Pins 9 (CA1) and 10 (CA0/f0). One additional global address enables broadcast writes to multiple devices. Address configuration is static at power-up and does not require runtime programming - simplifying multi-device bus topology design.
LTC2481IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC2481IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2481IDD#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 LTC2481IDD#PBF reliable?
The price and inventory of LTC2481IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2481IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2481IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2481IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2481IDD#PBF?
LTC2481IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2481IDD#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 LTC2481IDD#PBF?
For technical support, including LTC2481IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2481IDD#PBF requirements.
6.How does Aetrix verify that LTC2481IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2481IDD#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 LTC2481IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2481IDD#PBF?
All LTC2481IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2481IDD#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 LTC2481IDD#PBF part is unused and in its original packaging.
Return procedure for LTC2481IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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