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Analog Devices Inc. LTC2489CDE#PBF
- Part No.:
- LTC2489CDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC2489CDE#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:759
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Product details
Overview
LTC2489CDE#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, no-latency delta-sigma ADC with 4-channel (2-differential) analog input capability, Easy Drive input current cancellation, and I²C interface. It delivers 2 ppm INL, 1 ppm offset error, 600 nV RMS noise, simultaneous 50 Hz/60 Hz rejection, and operates from 2.7 V to 5.5 V - enabling direct digitization of high-impedance sensors in industrial process control systems.
For engineers reviewing the LTC2489CDE#PBF datasheet, LTC2489CDE#PBF pinout, LTC2489CDE#PBF application, or LTC2489CDE#PBF equivalent, key selection considerations include its rail-to-rail common-mode input range (GND to VCC), zero differential input current, auto-calibration per conversion, 24-bit I²C output format, and integrated oscillator eliminating external clock requirements.
Technical Context
The LTC2489CDE#PBF implements a third-order delta-sigma modulator with decimating FIR filter and automatic offset/full-scale calibration on every conversion cycle. Its patented Easy Drive front end cancels differential input current via passive sampling network, enabling direct connection of high-impedance sources without buffer amplifiers.
It supports configurable channel selection (CH0–CH3 with COM) for single-ended or differential inputs, features an internal 307.2 kHz oscillator (fO = GND), and provides simultaneous 50 Hz/60 Hz line-frequency rejection through digital filter nulls - all while maintaining no-latency operation: the first result after channel change is fully settled and valid.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across full input range. |
| INL | 2 ppm of VREF - ensures <±0.0002% linearity error for precision measurement applications. |
| Offset Error | 1 µV typical - enables accurate zero-point measurement without manual calibration. |
| Noise (RMS) | 600 nV RMS - corresponds to 0.02 LSB transition noise at 5 V reference, supporting sub-µV signal resolution. |
| Common-Mode Range | GND to VCC - allows rail-to-rail input signals independent of reference voltage setting. |
| Power Supply | 2.7 V to 5.5 V - supports battery-powered and industrial 3.3 V/5 V systems with 0.8 mW typical consumption. |
| I²C Addressing | 9 pin-selectable addresses + global sync address - enables multi-device bus configuration without address conflict. |
Pinout & Package
14-lead (4 mm × 3 mm) plastic DFN package with exposed pad (Pin 15 = GND, must be soldered). Pin count and layout match standard JEDEC MO-229WAY.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REF– (14) | Differential reference negative input | Sets lower bound of reference voltage; must be ≤ REF+ – 0.1 V for valid operation. |
| REF+ (13) | Differential reference positive input | Defines full-scale range (VREF = REF+ – REF–); common-mode range extends from GND to VCC. |
| VCC (12) | Positive supply | 2.7 V to 5.5 V operation; requires 10 µF tantalum + 0.1 µF ceramic bypass to GND. |
| CH0–CH3 (8–11) | Analog input channels | Selectable as IN+ or IN– in single-ended/differential modes; absolute voltage range: GND – 0.3 V to VCC + 0.3 V. |
| COM (7) | Common negative input | Shared IN– for all single-ended configurations; enables 4 single-ended or 2 differential inputs. |
| GND (6) | Ground reference | Low-impedance connection required; exposed pad (Pin 15) is also GND and must be soldered. |
| SDA (5) | I²C bidirectional data line | Open-drain output requiring external pull-up; transmits 24-bit conversion result or receives channel select bits. |
| SCL (4) | I²C clock input | Slave-only interface; supports up to 400 kHz clock frequency for fast-mode I²C. |
| CA0, CA1 (2–3) | I²C address configuration | Three-state (LOW/HIGH/FLOAT) pins selecting one of nine device addresses on shared bus. |
| fO (1) | Frequency control | Connect to GND for internal 307.2 kHz oscillator; drive externally to override conversion rate and filter nulls. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive input current cancellation | Eliminates differential input current errors, enabling direct digitization of sensors with source impedances >100 kΩ without external buffers. |
| No-latency conversion | Digital filter settles in one cycle - first output after channel change is fully accurate and usable immediately. |
| Simultaneous 50 Hz/60 Hz rejection | Hardware-based digital filtering rejects both line frequencies concurrently without software intervention or configuration. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction removes drift due to temperature, supply variation, and channel switching. |
| Rail-to-rail common-mode input | Supports input signals from GND – 0.3 V to VCC + 0.3 V independent of reference voltage, simplifying sensor interfacing. |
Applications
| Industrial Process Monitoring | Direct Temperature Sensing |
|---|---|
Use Scenario: Measuring thermocouple or RTD outputs in PLC analog input modules under noisy factory environments. IC Role / Device Role / Timing Role: Precision 16-bit ADC with simultaneous 50/60 Hz rejection and zero-latency output for real-time loop control. Use Value: Eliminates need for external instrumentation amplifiers and line-frequency notch filters, reducing BOM cost and board area by >30%. |
Use Scenario: Digitizing thermistor or semiconductor temperature sensor outputs in HVAC controllers and battery management systems. IC Role / Device Role / Timing Role: Direct sensor digitizer with auto-calibration and rail-to-rail input, enabling single-supply operation down to 2.7 V. Use Value: Achieves ±0.1°C accuracy over –40°C to +85°C without external trimming, leveraging 1 ppm offset and 2 ppm INL performance. |
| Portable Instrumentation | Environmental Data Acquisition |
Use Scenario: Battery-powered handheld multimeters and data loggers measuring low-level sensor outputs. IC Role / Device Role / Timing Role: Ultra-low-power ADC (1 µA sleep current) with integrated oscillator and I²C interface for microcontroller host. Use Value: Enables >1-year battery life in continuous-sampling mode using coin-cell power, thanks to 0.8 mW active power and automatic power gating. |
Use Scenario: Air quality monitors digitizing electrochemical gas sensor outputs with high common-mode interference. IC Role / Device Role / Timing Role: High-impedance input ADC with Easy Drive cancellation and 140 dB DC common-mode rejection. Use Value: Maintains 16-bit accuracy despite sensor cable lengths >1 m and PCB layout constraints, avoiding guard traces or shielding. |
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 |
|---|---|---|---|
| ADS1115IDGSR | 16-bit, 4-channel, I²C, but lacks Easy Drive cancellation and simultaneous 50/60 Hz rejection; higher input bias current (150 pA vs. <10 nA). | Requires external op-amp buffering for high-Z sensors; less robust in AC-coupled industrial noise environments. | Prefer LTC2489CDE#PBF when direct sensor interface, line-rejection, or zero-latency operation is required. |
| MAX11613EEE+ | 16-bit, 8-channel, SPI interface only; no integrated oscillator; no simultaneous 50/60 Hz rejection; higher noise (1.2 µV RMS). | Needs external clock and SPI host; unsuitable for I²C-only systems or line-noise-sensitive applications. | Choose LTC2489CDE#PBF for I²C compatibility, self-contained timing, and superior noise/line-rejection specs. |
Compared with ADS1115IDGSR and MAX11613EEE+, the LTC2489CDE#PBF uniquely combines zero-latency conversion, Easy Drive input cancellation, and simultaneous 50/60 Hz rejection in a single I²C device - delivering measurable accuracy and design simplicity advantages in sensor front-end applications where external buffering or post-processing would otherwise be mandatory.
Availability
LTC2489CDE#PBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, environmental monitoring, and precision temperature sensing requiring stable component supply and long-term manufacturability.
Supply support for LTC2489CDE#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 full product support, documentation, and manufacturing continuity for the LTC portfolio.
The LTC2489 belongs to Linear's precision delta-sigma ADC family, designed specifically for direct sensor digitization in noise-prone industrial and portable applications where high impedance, wide common-mode range, and line-frequency immunity are critical.
FAQ
What is the operating temperature range for the LTC2489CDE#PBF?
The LTC2489CDE#PBF is rated for 0°C to 70°C ambient operation. This commercial-grade temperature range is defined by the 'C' suffix in the part number and validated across all electrical specifications including INL, offset error, and noise performance. The device uses internal auto-calibration to maintain accuracy across this range without external compensation.
Does the LTC2489CDE#PBF require an external crystal or clock source?
No, the LTC2489CDE#PBF includes a fully integrated oscillator. When the fO pin is tied to GND, it operates from an internal 307.2 kHz clock - sufficient for standard 15.625 SPS output rate with simultaneous 50 Hz/60 Hz rejection. An external clock may be applied to fO only if custom data rates or alternate filter nulls are needed.
How does the Easy Drive technology in the LTC2489CDE#PBF eliminate input current errors?
The LTC2489CDE#PBF uses a patented passive sampling network that automatically cancels differential input current during conversion. This eliminates dynamic errors caused by source impedance mismatch, allowing rail-to-rail signals and impedances up to 1 MΩ to be digitized directly - without external op-amps or matched resistor networks.
Can the LTC2489CDE#PBF measure single-ended and differential signals on the same device?
Yes, the LTC2489CDE#PBF supports both configurations. It offers four analog inputs (CH0–CH3) and a dedicated COM pin. Users can configure any pair (e.g., CH0/CH1 or CH0/COM) as differential, or use CH0–CH3 individually against COM for single-ended measurements - all selectable via I²C register writes without hardware changes.
What is the significance of "no latency" in the LTC2489CDE#PBF datasheet?
"No latency" means the LTC2489CDE#PBF's digital filter settles in a single conversion cycle. Unlike conventional delta-sigma ADCs requiring multiple samples to stabilize after channel changes, the first output following any multiplexer selection is fully accurate and meets all specifications - enabling true real-time multiplexed measurement without delay or discarded readings.
LTC2489CDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Single Ended
- 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
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 14-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2489CDE#PBF FAQ
1.How can I place an order for LTC2489CDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2489CDE#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 LTC2489CDE#PBF reliable?
The price and inventory of LTC2489CDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2489CDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC2489CDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2489CDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2489CDE#PBF?
LTC2489CDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2489CDE#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 LTC2489CDE#PBF?
For technical support, including LTC2489CDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2489CDE#PBF requirements.
6.How does Aetrix verify that LTC2489CDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2489CDE#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 LTC2489CDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC2489CDE#PBF?
All LTC2489CDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2489CDE#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 LTC2489CDE#PBF part is unused and in its original packaging.
Return procedure for LTC2489CDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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