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Analog Devices Inc. LTC2481HDD#TRPBF
- Part No.:
- LTC2481HDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2481HDD#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,451
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Product details
Overview
LTC2481HDD#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 0.1 V minimum reference voltage, supports simultaneous 50 Hz/60 Hz rejection, and operates from –40°C to 125°C in a 10-lead 3 mm × 3 mm DFN package - ideal for high-accuracy industrial sensor interfaces.
For engineers reviewing the LTC2481HDD#TRPBF datasheet, LTC2481HDD#TRPBF pinout, LTC2481HDD#TRPBF application, or LTC2481HDD#TRPBF equivalent, key selection considerations include its H-grade temperature range, zero differential input current architecture, 2 ppm INL, 1 µV offset error, and support for external oscillator or internal trimmed oscillator operation.
Technical Context
The LTC2481HDD#TRPBF implements a third-order delta-sigma modulator with automatic offset and full-scale calibration, enabling no-latency digital filter settling in a single cycle. Its Easy Drive sampling scheme cancels dynamic input current errors without on-chip buffering, allowing direct digitization of high-impedance sources up to 100 kΩ while maintaining DC accuracy.
It integrates a programmable-gain amplifier (1× to 256×), internal temperature sensor, and six I²C addresses (plus one global sync address). The device supports both normal and 2× speed modes, with conversion times ranging from 78.7 ms (2×, 50 Hz mode, H-grade) to 165.1 ms (1×, simultaneous 50/60 Hz mode, H-grade), and features configurable line-frequency rejection via internal or external oscillator.
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 (0.25 LSB) max - ensures high linearity for precision measurement applications like strain gauges and weight scales. |
| Offset Error | ±0.5 µV (typ), ±2.5 µV (max) - enables sub-microvolt DC accuracy without system-level trimming. |
| Full-Scale Error | ±25 ppm (H-grade) - maintains consistent gain accuracy over temperature and supply variation. |
| Input Common Mode Range | GND to VCC, independent of reference - simplifies sensor interfacing with wide common-mode swing. |
| Reference Voltage Range | 0.1 V to VCC - allows low-voltage references (e.g., 100 mV bandgap) or direct tie to VCC. |
| I²C Speed | Up to 400 kHz Fast-mode - supports high-throughput configuration and readout in multi-device systems. |
Pinout & Package
The LTC2481HDD#TRPBF is housed in a 10-lead (3 mm × 3 mm) plastic DFN package with exposed pad (Pin 11) soldered to PCB ground. Pin 1 = REF+, Pin 2 = VCC, Pin 3 = REF–, Pin 4 = IN+, Pin 5 = IN–, Pin 6 = SCL, Pin 7 = SDA, Pin 8 = GND, Pin 9 = CA1, Pin 10 = CA0/f0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+, REF– | Differential reference input | Defines full-scale range; supports 0.1 V to VCC differential voltage with GND-to-VCC common-mode range. |
| IN+, IN– | Differential analog input | Rail-to-rail input capability with zero differential input current - eliminates external buffer requirements for high-Z sensors. |
| VCC, GND | Power supply terminals | Operates from 2.7 V to 5.5 V; requires local 1 µF + 0.1 µF bypassing for noise immunity. |
| SCL, SDA | I²C serial interface | Standard-mode/Fast-mode compatible; SDA is open-drain requiring external pull-up; SCL is input-only clock. |
| CA1, CA0/f0 | I²C address control / external clock input | Configures one of six slave addresses; CA0/f0 accepts external oscillator (10–1000 kHz) for precise line-frequency rejection tuning. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive input current cancellation | Eliminates dynamic input current errors - enables direct connection to high-impedance transducers (e.g., load cells, thermistors) without signal degradation. |
| No-latency ΔΣ conversion | Digital filter settles in one cycle - provides immediate, deterministic output timing critical for closed-loop control and synchronized sampling. |
| Programmable gain (1–256) | Eight discrete gain steps - optimizes dynamic range for varying sensor output amplitudes without external amplification. |
| Simultaneous 50 Hz/60 Hz rejection | Single conversion rejects both mains frequencies - essential for battery-powered or globally deployed instrumentation in mixed-grid environments. |
| H-grade temperature range (–40°C to 125°C) | Guaranteed performance across automotive under-hood and industrial process control environments. |
Applications
| Direct Sensor Digitizer | Industrial Process Control |
|---|---|
Use Scenario: Direct digitization of millivolt-level outputs from unbuffered strain gauge bridges or RTDs in compact field instruments. IC Role / Device Role / Timing Role: Precision ADC with integrated PGA and line-frequency rejection - replaces signal-conditioning op-amp stages and external filters. Use Value: Reduces BOM count by eliminating external instrumentation amplifiers and notch filters while maintaining 16-bit accuracy at 125°C ambient. | Use Scenario: Monitoring pressure, flow, or level in chemical plant PLC analog input modules operating in harsh thermal environments. IC Role / Device Role / Timing Role: High-stability, temperature-compensated ADC with auto-calibration - serves as primary measurement front-end in safety-critical loop controllers. Use Value: Delivers <±25 ppm full-scale error over –40°C to 125°C, enabling single-point calibration and long-term drift stability without recalibration. |
| Weight Scales | Direct Temperature Measurement |
Use Scenario: High-resolution weighing systems using load cells with source impedances >50 kΩ and microvolt-level sensitivity. IC Role / Device Role / Timing Role: Rail-to-rail ΔΣ ADC with zero differential input current - acquires bridge outputs without loading-induced nonlinearity. Use Value: Achieves 0.25 LSB INL and 0.5 µV offset error, supporting 1:100,000+ resolution in legal-for-trade scale designs. | Use Scenario: Embedded temperature monitoring of motor windings or power electronics using internal PTAT sensor or external thermistor. IC Role / Device Role / Timing Role: Integrated temperature-sensing ADC with programmable gain and I²C interface - provides calibrated digital temperature data without external components. Use Value: Internal PTAT output (390–450 mV at 27°C) digitized with same 16-bit pipeline, enabling ±0.1°C relative accuracy in thermal management subsystems. |
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, SPI interface, integrated PGA and burnout current sources; no built-in line-frequency rejection. | Requires external digital filtering for 50/60 Hz rejection; better suited for ultra-high-resolution lab equipment than cost-sensitive industrial sensors. | Select when higher resolution and integrated diagnostics outweigh need for I²C simplicity and embedded rejection. |
| MAX11206ETL+ | 24-bit resolution, I²C interface, internal oscillator only (no external clock option); ±4 ppm INL, –40°C to 105°C rating. | Lacks simultaneous 50/60 Hz rejection and H-grade temperature range - unsuitable for automotive under-hood or extended industrial use. | Choose for space-constrained medical or portable test gear where 105°C max suffices and 24-bit depth is mandatory. |
Compared with ADS124S08IPW and MAX11206ETL+, the LTC2481HDD#TRPBF uniquely combines I²C simplicity, zero-differential-input-current architecture, simultaneous 50/60 Hz rejection, and guaranteed 125°C operation - making it optimal for ruggedized, low-power sensor nodes where layout area and thermal robustness are critical.
Availability
LTC2481HDD#TRPBF is available at Aetrix Electronics and suitable for industrial process control, automotive sensor modules, and precision instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2481HDD#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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2481HDD#TRPBF belongs to ADI's legacy Linear Technology precision ADC product line, designed specifically for direct sensor digitization in thermally demanding, low-power, and space-constrained applications - emphasizing ease of use, minimal external components, and guaranteed metrological performance.
FAQ
What is the operating temperature range of the LTC2481HDD#TRPBF?
The LTC2481HDD#TRPBF is rated for operation from –40°C to +125°C, meeting the H-grade specification. This extended range is validated across all electrical parameters including offset error (±2.5 µV max), full-scale error (±40 ppm max), and integral nonlinearity (2 ppm max), making it suitable for under-hood automotive and high-temperature industrial environments where the LTC2481HDD#TRPBF delivers guaranteed performance without derating.
Does the LTC2481HDD#TRPBF require external passive components for basic operation?
Yes - the LTC2481HDD#TRPBF requires a 1 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor between VCC and GND, placed as close as possible to Pins 2 and 8. No external crystal or oscillator is needed due to its on-chip trimmed oscillator, but an external clock (10–1000 kHz) may be applied to CA0/f0 for precise line-frequency rejection tuning in the LTC2481HDD#TRPBF.
How does the Easy Drive technology in the LTC2481HDD#TRPBF improve sensor interface design?
Easy Drive technology in the LTC2481HDD#TRPBF eliminates dynamic differential input current through automatic cancellation during sampling. This allows direct connection to high-impedance sensors (e.g., >100 kΩ strain gauges) without external buffers or compensation networks, preserving DC accuracy and reducing board area, power, and cost - a core advantage confirmed in the LTC2481HDD#TRPBF's rail-to-rail input specification and 0.1 µV/°C offset drift.
Can the LTC2481HDD#TRPBF reject both 50 Hz and 60 Hz interference simultaneously?
Yes - the LTC2481HDD#TRPBF supports a dedicated simultaneous 50 Hz/60 Hz rejection mode, implemented via internal oscillator configuration or external clock at 280 kHz ±2%. This mode places digital filter nulls at both frequencies in a single conversion cycle, verified in the LTC2481HDD#TRPBF's Electrical Characteristics table and Typical Performance plots (G25, G40), ensuring robust operation in globally deployed equipment.
What I²C addressing options does the LTC2481HDD#TRPBF support?
The LTC2481HDD#TRPBF supports six unique I²C slave addresses via two address pins (CA1 and CA0/f0), each configurable as LOW, HIGH, or Floating (three-state for CA1; two-state for CA0/f0). It also includes one global address for synchronized conversions across multiple LTC2481HDD#TRPBF devices on the same bus - enabling scalable multi-channel sensor arrays without address conflicts.
LTC2481HDD#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 ~ 125°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2481HDD#TRPBF FAQ
1.How can I place an order for LTC2481HDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2481HDD#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 LTC2481HDD#TRPBF reliable?
The price and inventory of LTC2481HDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2481HDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2481HDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2481HDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2481HDD#TRPBF?
LTC2481HDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2481HDD#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 LTC2481HDD#TRPBF?
For technical support, including LTC2481HDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2481HDD#TRPBF requirements.
6.How does Aetrix verify that LTC2481HDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2481HDD#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 LTC2481HDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2481HDD#TRPBF?
All LTC2481HDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2481HDD#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 LTC2481HDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC2481HDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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