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Analog Devices Inc. LTC2485IDD#TRPBF
- Part No.:
- LTC2485IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2485IDD#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:11,913
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Product details
Overview
LTC2485IDD#TRPBF from Analog Devices (formerly Linear Technology) is a 24-bit + sign delta-sigma analog-to-digital converter with patented Easy Drive input current cancellation, I²C interface, and on-chip oscillator. It delivers 2 ppm INL, 1 ppm offset error, and rail-to-rail input range (0 V to VCC) while directly digitizing high-impedance sensors - such as strain gauges and load cells - without external buffering or calibration circuitry.
For engineers reviewing the LTC2485IDD#TRPBF datasheet, LTC2485IDD#TRPBF pinout, LTC2485IDD#TRPBF application, or LTC2485IDD#TRPBF equivalent, key selection considerations include its programmable 50 Hz/60 Hz/combined line rejection, 2× speed mode, six I²C addresses, internal oscillator eliminating external crystals, and guaranteed no missing codes across –40°C to +85°C operation.
Technical Context
The LTC2485IDD#TRPBF implements a third-order delta-sigma modulator with continuous auto-calibration for offset and full-scale, enabling zero-latency digital filter settling in one conversion cycle. Its Easy Drive architecture cancels differential input current dynamically, allowing direct connection to sensors with source impedances up to 100 kΩ while maintaining DC accuracy.
It supports three line-rejection modes (50 Hz, 60 Hz, or simultaneous 50/60 Hz) via I²C configuration and offers two conversion speeds: standard (e.g., 131–164 ms depending on mode) and 2× speed (e.g., 66–82 ms). The internal oscillator operates at ~307.2 kHz (60 Hz mode), and the device accepts external clock inputs (10–1000 kHz) on CA0/f0 for custom rejection frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit + sign, no missing codes - ensures monotonicity and full dynamic range utilization in precision measurement systems. |
| INL | 2 ppm (0.25 LSB) - enables sub-µV-level linearity for high-accuracy weight scales and instrumentation. |
| Offset Error | 1 µV typical - eliminates need for system-level zero-point trimming in sensor front-ends. |
| Input Common Mode Range | 0 V to VCC - supports direct interfacing to unbuffered ratiometric sensors referenced to same supply. |
| Reference Voltage Range | 0.1 V to VCC - allows low-voltage reference use (e.g., 100 mV) or direct tie to VCC, simplifying BOM. |
| I²C Interface | Standard/Fast-mode (up to 400 kHz), 7-bit address + global sync - enables multi-device daisy-chaining and synchronized sampling in distributed sensor networks. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V industrial and portable systems. |
| Operating Temperature | –40°C to +85°C - qualified for industrial process control and embedded metering applications. |
Pinout & Package
Package: 10-lead (3 mm × 3 mm) 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 voltage; common-mode independent of VREF, enabling flexible ratiometric or absolute referencing. |
| IN+ / IN– | Differential analog inputs | Rail-to-rail input range (GND – 0.3 V to VCC + 0.3 V); Easy Drive cancels differential input current, enabling direct high-Z sensor connection. |
| VCC / GND | Power supply and ground | VCC requires local 1 µF tantalum + 0.1 µF ceramic bypass; exposed pad must be connected to PCB ground plane for thermal and electrical integrity. |
| SCL / SDA | I²C serial clock and bidirectional data | SCL is input-only; SDA is open-drain requiring external pull-up - supports multi-master bus and hot-plug compatibility. |
| CA1 / CA0/f0 | I²C address control / external clock input | CA1: 3-state (LOW/HIGH/FLOAT) for address bit; CA0/f0: HIGH/FLOAT for address or driven by external 10–1000 kHz clock to set rejection null and override address. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive Input Current Cancellation | Eliminates differential input current errors, enabling direct digitization of high-impedance sensors (e.g., 100 kΩ strain gauges) without signal degradation or external op-amp buffering. |
| Programmable Line Frequency Rejection | Configurable 50 Hz, 60 Hz, or simultaneous 50/60 Hz rejection via I²C - critical for stable measurements in noisy AC-powered industrial environments. |
| No-Latency Digital Filter | Digital filter settles in a single conversion cycle - provides immediate valid output after conversion completion, simplifying real-time control loop timing. |
| On-Chip Trimmed Oscillator | Eliminates need for external crystal or oscillator; reduces BOM count and board space while maintaining precise 50/60 Hz rejection without component tolerance drift. |
| Six I²C Addresses + Global Sync | Supports up to six independent LTC2485IDD#TRPBF devices on one bus; global address enables synchronized conversions across multiple channels for coherent multi-sensor acquisition. |
| Internal Temperature Sensor | Integrated PTAT signal (390–450 mV at 27°C) provides on-chip die temperature monitoring - useful for thermal drift compensation in precision systems. |
Applications
| Direct Sensor Digitizer | Weight Scales |
|---|---|
Use Scenario: Direct digitization of millivolt-level outputs from unamplified bridge sensors (e.g., load cells, pressure transducers) in battery-powered handheld instruments. IC Role / Device Role / Timing Role: Primary ADC with integrated Easy Drive and auto-calibration - replaces discrete op-amp + ADC signal chain while maintaining 24-bit resolution and sub-µV offset stability. Use Value: Reduces component count by ≥3 (op-amp, reference, buffer), lowers power (160 µA active, 1 µA sleep), and eliminates manual calibration during production. | Use Scenario: High-accuracy platform scales used in commercial kitchens and warehouse logistics where 0.005% full-scale repeatability is required. IC Role / Device Role / Timing Role: Precision 24-bit ADC with simultaneous 50/60 Hz rejection - rejects mains-borne noise from lighting, HVAC, and motors without external notch filters. Use Value: Achieves <1 µV RMS noise and 2 ppm INL over –10°C to +40°C ambient, enabling Class III legal-for-trade certification without thermal chamber compensation. |
| Strain Gauge Transducers | Industrial Process Control |
Use Scenario: Monitoring mechanical stress in structural health monitoring systems deployed on bridges or wind turbine blades using quarter-bridge configurations. IC Role / Device Role / Timing Role: Low-power, rail-to-rail input ADC with programmable 2× speed mode - captures transient strain events at up to 12.8 SPS while maintaining 1 ppm offset drift over temperature. Use Value: Enables battery life >5 years in wireless nodes due to 1 µA sleep current and eliminates external excitation voltage regulation circuitry. | Use Scenario: Analog input modules in PLCs measuring thermocouple, RTD, or 4–20 mA loop signals in chemical plant control cabinets with high EMI exposure. IC Role / Device Role / Timing Role: Isolated channel ADC with 140 dB CMRR and 120 dB PSRR - rejects common-mode transients and supply ripple without external filtering components. Use Value: Maintains ±0.001% reading accuracy despite 2 kV fast transient bursts on adjacent I/O lines, reducing field failure rates by >90% vs. non-EMI-hardened alternatives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPW | 24-bit, SPI interface, integrated PGA (1–128×), lower INL (0.5 ppm), but no built-in line rejection or Easy Drive; requires external reference. | Better for multi-channel systems needing programmable gain; less suitable for direct high-Z sensor interfaces without external buffering. | Select when system already uses SPI infrastructure and requires on-chip amplification - not for drop-in replacement due to interface and input architecture differences. |
| MAX11206ETL+ | 24-bit, I²C interface, 1.8–3.6 V supply only, higher offset drift (10 nV/°C vs. 10 nV/°C typical), no simultaneous 50/60 Hz rejection. | Targeted at ultra-low-power portable medical devices; lacks industrial-grade line rejection and wide common-mode range. | Choose for battery-operated wearables where supply voltage <3.3 V is mandatory - not recommended for mains-powered industrial equipment. |
Compared with ADS124S08IPW and MAX11206ETL+, the LTC2485IDD#TRPBF uniquely combines I²C simplicity, Easy Drive high-Z input capability, and factory-trimmed simultaneous 50/60 Hz rejection - making it optimal for cost-sensitive, space-constrained industrial sensor nodes where external components must be minimized.
Availability
LTC2485IDD#TRPBF is available at Aetrix Electronics and suitable for industrial process control, precision weighing systems, and structural health monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2485IDD#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 LTC2485IDD#TRPBF belongs to ADI's legacy Linear Technology precision ADC product line, designed specifically for direct sensor digitization in noise-sensitive, low-power industrial instrumentation where ease of design, minimal external components, and guaranteed metrological performance are critical.
FAQ
What is the operating temperature range of the LTC2485IDD#TRPBF?
The LTC2485IDD#TRPBF is rated for –40°C to +85°C operation, matching the "I" grade specification. This extended range ensures reliable performance in industrial environments such as factory automation cabinets, outdoor metering enclosures, and transportation equipment where ambient temperatures exceed commercial limits. The device maintains specified INL, offset, and noise performance across this full range per datasheet Electrical Characteristics tables.
Does the LTC2485IDD#TRPBF require an external crystal or oscillator?
No, the LTC2485IDD#TRPBF includes an on-chip trimmed oscillator that supports all standard line rejection modes (50 Hz, 60 Hz, simultaneous 50/60 Hz) without external timing components. An external clock (10–1000 kHz) may be applied to CA0/f0 only if custom rejection frequencies are needed - otherwise, the internal oscillator eliminates BOM cost, board space, and layout complexity associated with crystals or oscillators.
How does Easy Drive technology benefit sensor interfacing in the LTC2485IDD#TRPBF?
Easy Drive in the LTC2485IDD#TRPBF automatically cancels differential input current at IN+ and IN–, enabling direct connection to high-impedance sensors (e.g., 100 kΩ strain gauges) without external op-amp buffers. This preserves DC accuracy, eliminates input bias current-induced errors, and supports rail-to-rail common-mode input (0 V to VCC) - significantly simplifying front-end design and improving system-level stability in precision measurement applications.
Can the LTC2485IDD#TRPBF reject both 50 Hz and 60 Hz interference simultaneously?
Yes, the LTC2485IDD#TRPBF supports simultaneous 50 Hz and 60 Hz line frequency rejection via I²C configuration. When enabled, its digital filter places nulls at both frequencies, making it ideal for globally deployed equipment (e.g., export-grade test instruments or multi-region industrial controllers) operating in regions with either 50 Hz or 60 Hz mains without hardware reconfiguration or firmware updates.
What is the significance of the "#TRPBF" suffix in LTC2485IDD#TRPBF?
The "#TRPBF" suffix indicates a lead-free, tape-and-reel packaged version of the LTC2485IDD - specifically, a 10-lead DFN package with Pb-free (RoHS-compliant) finish, supplied in moisture-sensitive tape-and-reel format suitable for automated SMT assembly. The "IDD" denotes the industrial temperature grade (–40°C to +85°C), and "#TRPBF" confirms compliance with JEDEC J-STD-020 moisture sensitivity level 3 and RoHS Directive 2011/65/EU.
LTC2485IDD#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC2485IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2485IDD#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 LTC2485IDD#TRPBF reliable?
The price and inventory of LTC2485IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2485IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2485IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2485IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2485IDD#TRPBF?
LTC2485IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2485IDD#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 LTC2485IDD#TRPBF?
For technical support, including LTC2485IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2485IDD#TRPBF requirements.
6.How does Aetrix verify that LTC2485IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2485IDD#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 LTC2485IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2485IDD#TRPBF?
All LTC2485IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2485IDD#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 LTC2485IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC2485IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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