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Analog Devices Inc. LTC2485IDD#PBF
- Part No.:
- LTC2485IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2485IDD#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,256
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Product details
Overview
LTC2485IDD#PBF from Analog Devices (formerly Linear Technology) is a 24-bit + sign no-latency delta-sigma ADC with patented Easy Drive input current cancellation and I²C interface. It delivers 2 ppm INL, 1 ppm offset error, and simultaneous 50 Hz/60 Hz line rejection - enabling direct digitization of high-impedance sensors (e.g., strain gauges, load cells) without external buffering or calibration circuitry.
For engineers reviewing the LTC2485IDD#PBF datasheet, LTC2485IDD#PBF pinout, LTC2485IDD#PBF application, or LTC2485IDD#PBF equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, application-specific implementation guidance, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The LTC2485IDD#PBF implements a third-order ∆Σ modulator with automatic on-chip offset and full-scale calibration, eliminating latency in digital filter settling (single-cycle convergence). Its Easy Drive architecture cancels differential input current dynamically, enabling rail-to-rail common-mode input range (0 V to VCC) independent of reference voltage.
It supports programmable line-frequency rejection (50 Hz, 60 Hz, or simultaneous 50/60 Hz) via internal oscillator or external clock (10–1000 kHz), and offers selectable 1×/2× conversion speed modes. The device integrates a temperature sensor and operates from 2.7 V to 5.5 V with sleep-mode current as low as 1 µA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit + sign, no missing codes - guarantees monotonicity and full dynamic range utilization for precision metrology. |
| INL | 2 ppm (0.25 LSB) - enables ±0.0002% full-scale accuracy in weight scales and DVMs without post-calibration. |
| Offset Error | 1 µV typical - eliminates zero-point drift in microvolt-level sensor measurements (e.g., thermopile, bridge transducers). |
| Line Rejection | Simultaneous 50 Hz/60 Hz at 87 dB - suppresses mains interference in industrial environments without external notch filters. |
| Supply Range | 2.7 V to 5.5 V - supports direct operation from Li-ion, USB, or 3.3 V/5 V system rails without LDO overhead. |
| Output Data Rate | 157 ms (1×) / 79 ms (2×) per conversion - balances resolution and throughput for slow-varying physical quantities. |
| I²C Interface | Standard/Fast-mode (up to 400 kHz), 6 configurable slave addresses + global sync - simplifies multi-sensor bus topology. |
Pinout & Package
Package: 10-lead (3 mm × 3 mm) plastic DFN with exposed pad (Pin 11 = GND, must be soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+ / REF− | Differential reference inputs | Accept 0.1 V to VCC reference span; enable ratiometric measurement with unregulated supplies or low-voltage references. |
| IN+ / IN− | Differential analog inputs | Support rail-to-rail common-mode (0 V to VCC) and ±0.5×VREF differential range; zero differential input current enables >100 kΩ source impedances. |
| VCC / GND | Power supply and ground | Require local 1 µF tantalum + 0.1 µF ceramic bypass; exposed pad improves thermal performance and noise immunity. |
| SCL / SDA | I²C clock and bidirectional data | Open-drain SDA requires external pull-up; supports multi-master bus; no level-shifting needed for 3.3 V/5 V systems. |
| CA0/f0 / CA1 | Address configuration / external clock input | Three-state address bits (LOW/HIGH/FLOAT) set one of six I²C addresses; CA0/f0 accepts 10–1000 kHz external clock for precise rejection tuning. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive Input Current Cancellation | Eliminates dynamic input bias errors - allows direct connection to high-Z sensors (e.g., RTDs, pH electrodes) without op-amp buffers. |
| No-Latency Digital Filter | Settles in one conversion cycle - enables deterministic timing for closed-loop control or synchronized multi-channel sampling. |
| Internal Trimmed Oscillator | Removes need for external crystal or clock source - reduces BOM count and PCB area in space-constrained designs. |
| Programmable Line Rejection | Configurable 50 Hz / 60 Hz / dual-mode rejection via register write - adapts to global power grid requirements without hardware change. |
| On-Chip Temperature Sensor | Provides factory-trimmed PTAT signal (390–450 mV at 27°C) - enables self-compensation or ambient monitoring without extra components. |
Applications
| Weight Scales | Strain Gauge Transducers |
|---|---|
|
Use Scenario: High-precision weighing in commercial scales and laboratory balances using full-bridge load cells. IC Role / Device Role / Timing Role: Direct digitizer of mV-level bridge outputs with integrated reference and line-noise rejection. Use Value: Achieves ≤1 µV offset drift and 2 ppm INL - meets OIML R76 Class III/IIIIL accuracy requirements without external calibration. |
Use Scenario: Structural health monitoring in civil engineering applications with bonded foil or MEMS strain gauges. IC Role / Device Role / Timing Role: Low-power, high-impedance analog front-end with rail-to-rail input and simultaneous 50/60 Hz rejection. Use Value: Enables direct connection to gauge resistances >5 kΩ and maintains <0.001% nonlinearity over temperature (-40°C to +85°C). |
| Direct Temperature Measurement | Industrial Process Control |
|
Use Scenario: Precision thermistor or RTD readout in HVAC and medical devices where self-heating must be minimized. IC Role / Device Role / Timing Role: Low-current, high-resolution ADC with programmable conversion rate and internal temperature sensing. Use Value: 1 µA typical input leakage and 1 µV offset allow sub-millidegree resolution with 10 kΩ NTC thermistors. |
Use Scenario: Analog input module for PLCs and distributed I/O systems measuring pressure, flow, and level transmitters. IC Role / Device Role / Timing Role: Isolated or non-isolated sensor interface with I²C output, wide common-mode range, and robust EMI immunity. Use Value: 140 dB common-mode rejection and 120 dB PSRR ensure stable readings in electrically noisy factory environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPW | 24-bit, SPI interface; integrated PGA (1–128×); no simultaneous 50/60 Hz rejection; higher supply current (350 µA active) | Better suited for multiplexed multi-channel sensor arrays requiring gain flexibility; less optimal for I²C-bus constrained systems | Select when PGA functionality and channel count outweigh I²C compatibility and ultra-low power needs. |
| MAX11206ETL+ | 24-bit, I²C interface; no Easy Drive; fixed 50/60 Hz rejection only; smaller 12-lead TQFN package | Lower cost option for basic industrial sensing; lacks rail-to-rail input and dynamic current cancellation | Choose for cost-sensitive, lower-accuracy applications where external buffering is acceptable and layout space is critical. |
Compared with ADS124S08IPW and MAX11206ETL+, the LTC2485IDD#PBF uniquely combines I²C simplicity, Easy Drive zero-input-current operation, and simultaneous dual-frequency rejection - making it optimal for compact, high-accuracy, low-power sensor nodes where board space and external component count are constrained.
Availability
LTC2485IDD#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 LTC2485IDD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC2485IDD#PBF belongs to Linear's precision delta-sigma ADC product line, designed specifically for high-accuracy, low-power sensor digitization in industrial, test & measurement, and scientific instrumentation applications.
FAQ
What is the operating temperature range of the LTC2485IDD#PBF?
The LTC2485IDD#PBF is rated for –40°C to +85°C, matching the "I" grade specification. This extended industrial temperature range ensures reliable operation in demanding environments such as factory automation, outdoor instrumentation, and automotive cabin sensing - unlike the "C" grade (0°C to 70°C) version LTC2485CDD#PBF.
Does the LTC2485IDD#PBF require an external crystal or oscillator?
No, the LTC2485IDD#PBF includes an on-chip trimmed oscillator, eliminating the need for external timing components in most applications. However, Pin 10 (CA0/f0) supports optional external clock input (10–1000 kHz) for precise line-frequency rejection tuning - the LTC2485IDD#PBF uses this signal automatically when driven, overriding the internal oscillator.
How does Easy Drive technology benefit sensor interfacing in the LTC2485IDD#PBF?
Easy Drive in the LTC2485IDD#PBF cancels differential input current dynamically during sampling, reducing effective input bias to near-zero. This allows direct connection to high-impedance sources like thermistors (>100 kΩ), strain gauges, and pH electrodes without buffer amplifiers - preserving signal integrity and minimizing thermal EMF errors in the LTC2485IDD#PBF signal chain.
Can the LTC2485IDD#PBF reject both 50 Hz and 60 Hz noise simultaneously?
Yes, the LTC2485IDD#PBF supports simultaneous 50 Hz/60 Hz line-frequency rejection mode with 87 dB attenuation. This is configured via its control register and enabled by its adaptive digital filter architecture - making the LTC2485IDD#PBF ideal for globally deployed equipment that must operate reliably in regions with either power standard without hardware modification.
What is the I²C address configuration capability of the LTC2485IDD#PBF?
The LTC2485IDD#PBF provides six unique I²C slave addresses via two three-state address pins (CA1 and CA0/f0), plus one global address for synchronized conversions across multiple devices. Each pin supports HIGH, LOW, or FLOAT states - enabling up to six LTC2485IDD#PBF units on a single I²C bus without address conflicts or external logic.
LTC2485IDD#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:
- 24
- 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:
- Selectable Address, Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2485IDD#PBF FAQ
1.How can I place an order for LTC2485IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2485IDD#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 LTC2485IDD#PBF reliable?
The price and inventory of LTC2485IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2485IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2485IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2485IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2485IDD#PBF?
LTC2485IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2485IDD#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 LTC2485IDD#PBF?
For technical support, including LTC2485IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2485IDD#PBF requirements.
6.How does Aetrix verify that LTC2485IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2485IDD#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 LTC2485IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2485IDD#PBF?
All LTC2485IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2485IDD#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 LTC2485IDD#PBF part is unused and in its original packaging.
Return procedure for LTC2485IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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