My Inquiry
My Account
Analog Devices Inc. LTC2485CDD#PBF
- Part No.:
- LTC2485CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2485CDD#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,991
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2485CDD#PBF from Analog Devices (formerly Linear Technology) is a 24-bit delta-sigma analog-to-digital converter with Easy Drive input current cancellation, I²C interface, and integrated oscillator. It delivers 2 ppm INL, 1 µV offset error, rail-to-rail input range (0 V to VCC), and programmable 50/60 Hz line rejection - enabling high-accuracy digitization of strain gauges, load cells, and precision temperature sensors in industrial instrumentation.
For engineers reviewing the LTC2485CDD#PBF datasheet, LTC2485CDD#PBF pinout, LTC2485CDD#PBF application, or LTC2485CDD#PBF equivalent, key selection criteria include differential input current cancellation capability, 24-bit no-missing-codes resolution with ±0.5×VREF full-scale range, internal oscillator operation, I²C address configurability (6 addresses + global sync), and 10-lead 3 mm × 3 mm DFN package thermal performance.
Technical Context
The LTC2485CDD#PBF employs a third-order delta-sigma modulator with automatic offset and full-scale calibration, eliminating latency via single-cycle digital filter settling. Its patented Easy Drive sampling scheme cancels differential input current, enabling direct connection to high-impedance sensors without external buffering.
It supports three line-rejection modes (50 Hz, 60 Hz, simultaneous 50/60 Hz) and a 2× speed mode, all configurable via I²C. The on-chip oscillator operates at ~307.2 kHz (internal) or accepts external clock input on CA0/f0, with reference voltage ranging from 0.1 V to VCC independent of common-mode input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit plus sign, no missing codes - guarantees monotonicity and full dynamic range utilization for precision measurement systems. |
| INL | 2 ppm (0.25 LSB) - ensures sub-µV-level linearity over full scale, critical for weight scales and DVMs requiring traceable accuracy. |
| Offset Error | ±0.5 µV typical - enables DC-coupled sensor interfaces (e.g., thermocouples, bridge transducers) without manual nulling. |
| Input Common-Mode Range | 0 V to VCC - allows direct digitization of rail-to-rail signals without level-shifting circuitry. |
| Reference Range | 0.1 V to VCC - supports low-voltage references (e.g., 100 mV bandgap) or direct tie to supply, simplifying BOM. |
| I²C Address Options | Six unique slave addresses + one global address - permits multi-device synchronization on shared bus without address conflict. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V industrial control rails and battery-powered portable instruments. |
Pinout & Package
Package: 10-lead (3 mm × 3 mm) plastic DFN (DD package); exposed pad (Pin 11) must be soldered to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF+ / REF– | Differential reference inputs | Accept 0.1 V to VCC reference span; common-mode independent of analog input, enabling flexible reference sourcing. |
| IN+ / IN– | Differential analog inputs | Support rail-to-rail common-mode (0 V to VCC) and ±0.5×VREF differential range; zero net 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 is GND and mandatory for thermal dissipation (θJA = 43°C/W). |
| SCL / SDA | I²C serial clock and bidirectional data | Standard-mode/Fast-mode compliant (≤400 kHz); SDA is open-drain requiring external pull-up; SCL is input-only. |
| CA0/f0 / CA1 | Chip address control / external oscillator input | Three-state logic (HIGH/LOW/FLOAT) sets I²C address bits; CA0/f0 doubles as external clock input (10–1000 kHz) for custom filter null placement. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive input current cancellation | Eliminates differential input current errors, enabling direct connection to high-impedance bridges and thermistors without buffer op-amps. |
| No-latency digital filter | Settles in one conversion cycle - avoids pipeline delay, ensuring immediate availability of valid data after each read command. |
| Programmable line-frequency rejection | Select 50 Hz, 60 Hz, or simultaneous 50/60 Hz rejection via I²C - essential for AC mains–coupled noise suppression in lab equipment and process controllers. |
| Internal trimmed oscillator | Removes need for external crystal or RC network - reduces component count, board area, and calibration overhead in space-constrained designs. |
| Continuous auto-calibration | Transparent offset and full-scale correction during operation - maintains accuracy across temperature and time without user intervention. |
Applications
| Weight Scales | Industrial Process Control |
|---|---|
Use Scenario: High-resolution weighing of bulk materials or pharmaceutical doses using resistive load cells with millivolt-level outputs. IC Role / Device Role / Timing Role: Direct sensor digitizer with 24-bit resolution, zero-input-current interface, and 50/60 Hz rejection to suppress ambient EMI. Use Value: Achieves ≤1 µV RMS noise and <2 ppm INL, enabling 1:1,000,000 dynamic range for Class III/IV legal-for-trade applications. | Use Scenario: Monitoring pressure, flow, or level in PLC-based factory automation systems with 4–20 mA loop-powered sensors. IC Role / Device Role / Timing Role: Precision ADC front-end with rail-to-rail input and wide common-mode range, interfacing directly to isolated sensor outputs. Use Value: Eliminates external signal conditioning, reducing BOM cost and layout complexity while maintaining ±0.005% full-scale accuracy over 0°C to 70°C. |
| Direct Temperature Measurement | Strain Gauge Transducers |
Use Scenario: Cold-junction compensation and thermocouple digitization in environmental monitoring stations. IC Role / Device Role / Timing Role: Dual-function ADC with integrated PTAT temperature sensor (390–450 mV at 27°C) and high-impedance analog inputs. Use Value: Enables self-contained cold-junction compensation without discrete temperature ICs, reducing system component count and calibration drift. | Use Scenario: Full-bridge strain gauge readout in structural health monitoring or test benches. IC Role / Device Role / Timing Role: Low-noise, low-drift delta-sigma converter with programmable gain-equivalent rejection and differential input cancellation. Use Value: Delivers <0.84 µVRMS noise in 2× speed mode and 15 ppm total unadjusted error, supporting sub-100 nε resolution in static load measurement. |
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 built-in line-rejection filter; requires external clock or crystal. | Requires additional filtering firmware for 50/60 Hz rejection; better suited for multiplexed multi-channel systems with variable gain needs. | Choose when channel count >1 and programmable gain is required; avoid if I²C bus simplicity and hardware line rejection are priorities. |
| MAX11206ETL+ | 24-bit, I²C interface, 1 µV offset, but no Easy Drive; max VREF = 2.048 V; no internal oscillator - requires external clock. | Lacks differential input current cancellation, limiting usable source impedance; fixed reference restricts flexibility with low-voltage sensors. | Choose only for cost-sensitive, low-power (<100 µA) applications where sensor impedance <10 kΩ and reference is fixed at 2.048 V. |
Compared with ADS124S08IPW and MAX11206ETL+, the LTC2485CDD#PBF uniquely integrates hardware-based 50/60 Hz rejection, zero-input-current architecture, and internal oscillator - reducing firmware burden, external components, and layout sensitivity in single-channel precision sensor digitization.
Availability
LTC2485CDD#PBF is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and weigh-scale manufacturing requiring stable component supply, long-term lifecycle support, and RoHS-compliant lead-free packaging.
Supply support for LTC2485CDD#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2485CDD#PBF belongs to ADI's legacy Linear Technology precision ADC product line, engineered specifically for low-drift, low-noise, single-channel sensor digitization in harsh industrial environments with stringent EMI immunity requirements.
FAQ
What is the operating temperature range for the LTC2485CDD#PBF?
The LTC2485CDD#PBF is rated for 0°C to 70°C ambient operation, as indicated by the "C" grade suffix. This commercial-grade specification ensures stability in controlled-environment instrumentation, HVAC controls, and benchtop test equipment where extended industrial (-40°C to 85°C) operation is not required. The device's internal auto-calibration maintains accuracy across this full range without external compensation.
Does the LTC2485CDD#PBF require an external crystal or oscillator?
No, the LTC2485CDD#PBF includes an on-chip trimmed oscillator, eliminating the need for external timing components in standard configurations. However, the CA0/f0 pin supports optional external clock input (10–1000 kHz) to shift the digital filter's rejection null - useful when precise custom line-frequency rejection or synchronization across multiple LTC2485CDD#PBF devices is needed.
How does the Easy Drive technology in the LTC2485CDD#PBF improve sensor interface performance?
Easy Drive technology in the LTC2485CDD#PBF cancels differential input current through patented sampling, resulting in near-zero net current into IN+ and IN– pins. This enables direct connection to high-impedance sensors (e.g., strain gauges >100 kΩ, thermistors) without buffer amplifiers, preserving signal integrity, reducing power consumption, and avoiding offset drift introduced by external op-amps.
Can the LTC2485CDD#PBF reject both 50 Hz and 60 Hz interference simultaneously?
Yes, the LTC2485CDD#PBF supports simultaneous 50 Hz/60 Hz line-frequency rejection via I²C configuration. This mode places digital filter nulls at both frequencies, making it ideal for globally deployed equipment (e.g., export-grade medical devices or portable analyzers) operating in regions with either mains standard - without requiring hardware changes or firmware reconfiguration per market.
What is the function of the CA1 and CA0/f0 pins on the LTC2485CDD#PBF?
The CA1 and CA0/f0 pins configure the LTC2485CDD#PBF's I²C slave address: CA1 is a three-state (LOW/HIGH/FLOAT) bit, and CA0/f0 is a two-state (HIGH/FLOAT) bit, yielding six unique addresses. Additionally, CA0/f0 serves as an external clock input - when driven with a clean square wave (≥10 kHz), it overrides the internal oscillator and sets the filter null frequency to fEOSC/5120.
LTC2485CDD#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2485CDD#PBF FAQ
1.How can I place an order for LTC2485CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2485CDD#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 LTC2485CDD#PBF reliable?
The price and inventory of LTC2485CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2485CDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2485CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2485CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2485CDD#PBF?
LTC2485CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2485CDD#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 LTC2485CDD#PBF?
For technical support, including LTC2485CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2485CDD#PBF requirements.
6.How does Aetrix verify that LTC2485CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2485CDD#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 LTC2485CDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2485CDD#PBF?
All LTC2485CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2485CDD#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 LTC2485CDD#PBF part is unused and in its original packaging.
Return procedure for LTC2485CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2485CDD#PBF Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
