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Analog Devices Inc. LTC2481HDD#PBF
- Part No.:
- LTC2481HDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2481HDD#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:727
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Product details
Overview
LTC2481HDD#PBF from Analog Devices (formerly Linear Technology) is a 16-bit plus sign delta-sigma analog-to-digital converter with patented Easy Drive input current cancellation, I²C interface, and integrated oscillator. It delivers 2 ppm INL, 1 ppm offset error, and rail-to-rail input range (0 V to VCC) while supporting programmable gain (1–256), 50/60 Hz line rejection, and operation from –40°C to +125°C. It directly digitizes high-impedance sensors in industrial process control and precision instrumentation.
For engineers reviewing the LTC2481HDD#PBF datasheet, LTC2481HDD#PBF pinout, LTC2481HDD#PBF application, or LTC2481HDD#PBF equivalent, key selection criteria include its H-grade temperature range, zero differential input current architecture, 24-bit output format with configuration readback, and compatibility with low-power, high-accuracy sensor interfaces requiring no external clock or buffer.
Technical Context
The LTC2481HDD#PBF employs a third-order delta-sigma modulator with continuous auto-calibration for offset and full-scale correction, eliminating drift without user intervention. Its Easy Drive sampling scheme cancels dynamic input current errors by balancing differential input currents, enabling direct connection to sources up to 100 kΩ with rail-to-rail common-mode range (GND to VCC) independent of reference voltage.
It integrates a trimmed on-chip oscillator (≈307.2 kHz) and supports external clocking via CA0/f0 pin for precise 50/60 Hz or simultaneous 50 Hz/60 Hz rejection. The I²C interface operates at up to 400 kHz, provides six selectable slave addresses plus one global address, and outputs 24-bit data containing 16-bit plus sign conversion result and configuration bits.
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) - enables sub-μV-level DC accuracy in precision measurement systems. |
| Offset Error | ±0.5 µV (typ), ±2.5 µV (max) - ensures baseline stability critical for strain gauge and temperature sensor digitization. |
| Full-Scale Error | ±25 ppm (H-grade) - maintains end-point accuracy across –40°C to +125°C operating range. |
| Input Common-Mode Range | 0 V to VCC - allows direct interfacing with unbuffered sensors referenced to system ground or supply rails. |
| Reference Voltage Range | 0.1 V to VCC - supports low-voltage references (e.g., 100 mV) or direct tie to VCC for simplified design. |
| I²C Speed | Up to 400 kHz - enables fast configuration and data retrieval in multi-device sensor networks. |
Pinout & Package
The LTC2481HDD#PBF is housed in a 10-lead (3 mm × 3 mm) DFN package with exposed pad (Pin 11, GND). Pin 11 must be soldered to PCB for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+ (Pin 1) | Differential reference positive input | Accepts voltage up to VCC; sets upper bound of reference span with REF–. |
| VCC (Pin 2) | Positive supply | 2.7 V to 5.5 V operation; requires local 1 µF + 0.1 µF bypassing to GND (Pin 8). |
| REF– (Pin 3) | Differential reference negative input | Must be ≥0.1 V below REF+; defines lower bound of reference span. |
| IN+ (Pin 4) | Differential analog input positive | Rail-to-rail capable (GND – 0.3 V to VCC + 0.3 V); benefits from Easy Drive zero-differential-current operation. |
| IN– (Pin 5) | Differential analog input negative | Same voltage range as IN+; differential input range = ±0.5 × VREF / gain. |
| SCL (Pin 6) | I²C serial clock input | Slave-only interface; accepts external clock up to 400 kHz; controls data timing on SDA. |
| SDA (Pin 7) | I²C bidirectional data line | Open-drain output; requires external pull-up; transmits 24-bit result or receives config byte. |
| GND (Pin 8) | Ground reference | Low-impedance connection required; exposed pad (Pin 11) is electrically tied to this pin. |
| CA1 (Pin 9) | I²C address control bit | Three-state (LOW/HIGH/FLOAT) selects one of six device addresses. |
| CA0/f0 (Pin 10) | I²C address bit / external clock input | When driven by ≥10 kHz signal, serves as system clock source and sets internal CA0 HIGH. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive input current cancellation | Eliminates dynamic input current errors, enabling direct digitization of high-impedance sensors (e.g., load cells, RTDs) without external buffers. |
| Programmable gain (1–256) | Eight discrete gain steps allow optimization of dynamic range for varying sensor output levels without hardware changes. |
| Simultaneous 50 Hz/60 Hz rejection | Single-conversion rejection of both line frequencies using internal or external oscillator-critical for global industrial equipment. |
| No-latency digital filter | Settles in one conversion cycle, delivering valid output immediately after conversion completes-no pipeline delay or settling wait. |
| On-chip trimmed oscillator | Removes need for external crystal or clock source, reducing BOM count and board space in compact sensor modules. |
Applications
| Direct Sensor Digitizer | Industrial Process Control |
|---|---|
Use Scenario: Digitizing output from unbuffered 350 Ω strain gauge bridges in weigh scale platforms. IC Role / Device Role / Timing Role: ADC front-end with rail-to-rail input, programmable gain, and 50/60 Hz rejection to suppress mains interference. Use Value: Enables single-chip, low-power, high-accuracy weight measurement with <2 ppm INL and no external op-amp buffering. | Use Scenario: Monitoring pressure transducer signals in chemical plant PLC I/O modules operating at 125°C ambient. IC Role / Device Role / Timing Role: High-temperature ADC with H-grade qualification, internal calibration, and I²C interface for remote sensor polling. Use Value: Delivers stable 16-bit resolution over full –40°C to +125°C range without recalibration or external compensation circuits. |
| Weight Scales | Direct Temperature Measurement |
Use Scenario: Battery-powered portable luggage scales requiring ultra-low sleep current and high DC accuracy. IC Role / Device Role / Timing Role: Low-power ADC with 1 µA sleep current and auto-calibrated offset/full-scale for millivolt-level bridge outputs. Use Value: Achieves >100,000-count resolution with <1 µV offset drift, extending battery life and eliminating manual zero adjustment. | Use Scenario: Direct digitization of PTAT voltage from on-chip temperature sensor in environmental monitoring nodes. IC Role / Device Role / Timing Role: Integrated ADC with internal temperature sensor path and programmable gain for calibrated Celsius output. Use Value: Provides factory-trimmed temperature readings (390–450 mV at 27°C) with <1 ppm/°C full-scale drift, eliminating external sensor and signal chain. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPW | 24-bit resolution, integrated PGA and burn-out current sources; no Easy Drive; requires external reference. | Better suited for multi-channel, high-resolution thermocouple systems; lacks rail-to-rail input and zero-differential-current advantage. | Select when higher resolution and channel count outweigh input impedance flexibility and ease of sensor interface. |
| MAX11206ETL+ | 20-bit resolution, internal oscillator, 50/60 Hz rejection; no programmable gain; 1.8–3.6 V supply only. | Targeted at low-voltage portable instrumentation; incompatible with 5 V systems and lacks H-grade temperature rating. | Select for battery-powered, single-supply designs where 20-bit resolution suffices and 5 V operation is not required. |
Compared with ADS124S08IPW and MAX11206ETL+, the LTC2481HDD#PBF uniquely combines H-grade temperature operation, Easy Drive zero-input-current architecture, and 16-bit precision with minimal external components-making it optimal for ruggedized, high-impedance sensor interfaces where layout simplicity and DC accuracy are prioritized over raw bit depth.
Availability
LTC2481HDD#PBF is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and high-reliability weight scale applications requiring stable component supply across extended temperature ranges.
Supply support for LTC2481HDD#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 acquired Linear Technology in 2017 and maintains its precision analog product lines, including high-performance delta-sigma ADCs.
The LTC2481HDD#PBF belongs to Linear's "Easy Drive" delta-sigma ADC family, designed specifically for direct digitization of high-impedance, low-level sensor signals in harsh industrial environments.
FAQ
What is the operating temperature range of the LTC2481HDD#PBF?
The LTC2481HDD#PBF is rated for –40°C to +125°C operation, making it suitable for under-hood automotive, industrial motor drives, and oil & gas downhole sensing applications where extended thermal performance is mandatory. This H-grade specification is confirmed in the Absolute Maximum Ratings table and applies across all electrical parameters unless otherwise noted.
Does the LTC2481HDD#PBF require an external crystal or oscillator?
No-the LTC2481HDD#PBF includes a factory-trimmed on-chip oscillator that supports standard 50 Hz, 60 Hz, and simultaneous 50/60 Hz rejection modes without external components. An external clock can be applied to CA0/f0 pin for custom rejection frequencies, but it is optional-not required-for basic operation.
How does the Easy Drive technology in the LTC2481HDD#PBF improve sensor interface design?
Easy Drive eliminates dynamic differential input current by automatically canceling IN+ and IN– input currents during sampling. This allows the LTC2481HDD#PBF to interface directly with high-impedance sensors (e.g., 100 kΩ thermistors or unbuffered strain gauges) without external op-amps or RC filters-reducing noise, cost, and board area while preserving DC accuracy.
What is the output data format of the LTC2481HDD#PBF?
The LTC2481HDD#PBF outputs a 24-bit word over I²C: the upper 16 bits contain the 16-bit plus sign conversion result, and the lower 8 bits contain the configuration register value used for that conversion (gain, speed mode, rejection setting). This enables deterministic correlation between measurement and setup without separate status reads.
Can the LTC2481HDD#PBF measure its own die temperature?
Yes-the LTC2481HDD#PBF integrates a PTAT (proportional-to-absolute-temperature) voltage generator (390–450 mV at 27°C) that can be selected as the analog input source via internal MUX. When configured for internal temperature sensing, the LTC2481HDD#PBF delivers calibrated, drift-compensated temperature readings without external components.
LTC2481HDD#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 ~ 125°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2481HDD#PBF FAQ
1.How can I place an order for LTC2481HDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2481HDD#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 LTC2481HDD#PBF reliable?
The price and inventory of LTC2481HDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2481HDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2481HDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2481HDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2481HDD#PBF?
LTC2481HDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2481HDD#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 LTC2481HDD#PBF?
For technical support, including LTC2481HDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2481HDD#PBF requirements.
6.How does Aetrix verify that LTC2481HDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2481HDD#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 LTC2481HDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2481HDD#PBF?
All LTC2481HDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2481HDD#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 LTC2481HDD#PBF part is unused and in its original packaging.
Return procedure for LTC2481HDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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