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Analog Devices Inc. LTC2489CDE#TRPBF
- Part No.:
- LTC2489CDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC2489CDE#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,837
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Product details
Overview
LTC2489CDE#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, no-latency delta-sigma ADC with 4-channel single-ended or 2-channel differential input capability, Easy Drive input current cancellation, I²C interface, and integrated oscillator. It delivers 2 ppm INL, 1 ppm offset error, 600 nVRMS noise, simultaneous 50 Hz/60 Hz rejection, and rail-to-rail input operation from GND to VCC. It is used in precision sensor digitization for industrial process control and temperature-compensated data acquisition systems.
For engineers reviewing the LTC2489CDE#TRPBF datasheet, LTC2489CDE#TRPBF pinout, LTC2489CDE#TRPBF application, or LTC2489CDE#TRPBF equivalent, key selection criteria include its zero-differential-input-current architecture, 24-bit output format with sign bit, 14-lead DFN package, I²C address configurability via CA0/CA1 pins, and guaranteed no missing codes across temperature.
Technical Context
The LTC2489CDE#TRPBF implements a third-order delta-sigma modulator with decimating FIR filter and auto-calibration engine that performs full offset and full-scale correction every conversion cycle. Its patented Easy Drive sampling network cancels differential input current dynamically, enabling direct connection of high-impedance sensors without external buffering.
It supports internal 307.2 kHz oscillator or external clock on fO pin for programmable data rate and notch tuning; accepts differential reference voltage (0.1 V to VCC) with common-mode range independent of VREF; and provides true bipolar input range of ±0.5·VREF in both differential and single-ended modes with tOPEN = 50 ns mux break-before-make timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage over temperature and supply range. |
| INL | 2 ppm of VREF - enables sub-μV-level linearity-critical measurements in precision instrumentation. |
| Offset Error | ±1 μV typical - eliminates need for system-level offset trimming in low-drift applications. |
| Noise (RMS) | 600 nV RMS - corresponds to 0.02 LSB transition noise at 5 V reference, supporting 16-bit effective resolution. |
| Common-Mode Range | GND to VCC - allows direct digitization of rail-to-rail signals without level-shifting circuitry. |
| I²C Address Options | 9 pin-selectable addresses + 1 global sync address - supports multi-device bus configurations without address conflict. |
| Supply Voltage | 2.7 V to 5.5 V - compatible with both 3.3 V and 5 V industrial logic domains and battery-powered systems. |
| Power Consumption | 160 μA typical conversion current, 1 μA sleep mode - enables ultra-low-power remote sensing deployments. |
Pinout & Package
Package: 14-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 15 = GND, must be soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| fO | External oscillator control input | Selects internal (GND) or external clock source; determines data rate and 50/60 Hz rejection null placement. |
| CA0, CA1 | I²C address configuration inputs | Three-state (LOW/HIGH/FLOAT) pins set one of nine device addresses; FLOAT = high-impedance state enabled by ≥2 MΩ pull-up/down. |
| SCL | I²C serial clock input | Slave-only interface; accepts up to 400 kHz clock; defines timing for SDA data sampling and output latching. |
| SDA | Bidirectional I²C data line | Open-drain output during read (24-bit result), high-impedance input during write (8-bit channel select); requires external pull-up. |
| GND | Analog/digital ground reference | Low-impedance return path for analog core, digital interface, and exposed thermal pad; critical for noise immunity. |
| COM | Common negative input for single-ended channels | Serves as IN– for CH0–CH3 in single-ended mode; supports rail-to-rail common-mode voltage (GND – 0.3 V to VCC + 0.3 V). |
| CH0–CH3 | Configurable analog input terminals | Programmable as IN+ or IN– in differential pairs (CH0/CH1, CH2/CH3) or as single-ended inputs referenced to COM. |
| VCC | Positive supply rail | 2.7 V to 5.5 V operation; requires local 10 μF tantalum + 0.1 μF ceramic bypassing for stable conversion performance. |
| REF+, REF– | Differential reference voltage inputs | Set full-scale range (VREF = REF+ – REF–); common-mode range spans GND to VCC, independent of VREF magnitude. |
Key Features
| Feature | Design Value |
|---|---|
| No latency conversion | Digital filter settles in one cycle; first result after channel change is fully accurate - eliminates multiplexing delay uncertainty in real-time systems. |
| Easy Drive input current cancellation | Zero differential input current enables direct interface to >100 kΩ source impedances without gain/offset degradation or external op-amps. |
| Simultaneous 50 Hz/60 Hz rejection | Integrated notch filtering rejects both line frequencies without software post-processing or external notch components. |
| Auto-calibration per conversion | Continuous offset and full-scale correction removes drift from temperature, supply variation, and channel switching - maintains 1 ppm offset stability. |
| Wide input common-mode range | GND to VCC common-mode support allows direct digitization of unbuffered thermocouples, RTDs, and bridge sensors operating near supply rails. |
| 24-bit signed output format | Includes sign bit and 16-bit data in MSB-first order; simplifies firmware parsing and eliminates separate sign-extension logic. |
Applications
| Direct Sensor Digitization | Industrial Process Control |
|---|---|
Use Scenario: Direct connection of high-impedance pH electrodes, load cells, or thermistors to ADC without signal conditioning. IC Role / Device Role / Timing Role: Precision analog front-end digitizer with integrated reference and I²C output; operates at user-defined update rates (e.g., 10–100 SPS). Use Value: Eliminates external instrumentation amplifier and anti-aliasing filter, reducing BOM count and layout area while preserving 16-bit DC accuracy. | Use Scenario: Monitoring pressure, flow, and temperature in PLC analog input modules with multi-sensor polling. IC Role / Device Role / Timing Role: Multi-channel sensor hub with automatic channel sequencing and synchronized I²C reads across distributed nodes. Use Value: Enables deterministic scan timing and simultaneous 50/60 Hz rejection across all channels - critical for EMI-prone factory floor environments. |
| Temperature-Compensated DAQ | Portable Instrumentation |
Use Scenario: High-accuracy environmental monitoring using thermocouple + cold-junction compensation with RTD reference. IC Role / Device Role / Timing Role: Dual-role ADC: digitizes thermocouple (differential) and RTD (single-ended) on shared COM node; auto-calibrates between conversions. Use Value: Maintains <1 μV offset drift over –40°C to 85°C, enabling <0.1°C temperature resolution without periodic recalibration. | Use Scenario: Battery-powered handheld multimeter or data logger requiring long runtime and precision DC measurements. IC Role / Device Role / Timing Role: Low-power measurement engine with 1 μA sleep current and wake-on-I²C-access; supports intermittent sampling at 1 SPS. Use Value: Achieves >1-year battery life on coin cell while delivering 16-bit resolution and 2 ppm INL - surpasses legacy SAR ADC power/accuracy trade-offs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS114S08IPWR | 24-bit resolution, SPI interface, integrated PGA and sensor excitation; no Easy Drive; higher power (350 μA active). | Requires external PGA for high-Z sensors; better suited for ratiometric bridge measurements than direct thermistor digitization. | Choose ADS114S08IPWR when programmable gain, built-in burnout current, or SPI bus integration is required - not for I²C-constrained or ultra-low-power designs. |
| MAX11206ETL+ | 18-bit resolution, I²C interface, 1.8 V to 3.6 V supply only; no simultaneous 50/60 Hz rejection; 1.2 μA sleep current. | Limited to low-voltage systems; lacks rail-to-rail input common-mode range - cannot digitize signals near VCC without level shifters. | Choose MAX11206ETL+ for space-constrained, single-supply 3.3 V systems where 18-bit resolution suffices and line-frequency rejection is handled externally. |
Compared with ADS114S08IPWR and MAX11206ETL+, the LTC2489CDE#TRPBF uniquely combines I²C simplicity, zero-differential-input-current operation, and guaranteed rail-to-rail input with 16-bit precision - making it optimal for cost-sensitive, low-power, high-impedance sensor interfaces where external amplification must be avoided.
Availability
LTC2489CDE#TRPBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, temperature-compensated data acquisition, and direct sensor digitization requiring stable component supply and long-term production continuity.
Supply support for LTC2489CDE#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 LTC2489CDE#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for direct high-impedance sensor digitization in noise-sensitive, low-power, and space-constrained applications - emphasizing ease of use, DC accuracy, and system-level integration.
FAQ
What is the operating temperature range for the LTC2489CDE#TRPBF?
The LTC2489CDE#TRPBF is rated for 0°C to 70°C ambient operation (C-grade). This is confirmed by the "LTC2489C" suffix in the part number and the Absolute Maximum Ratings table specifying LTC2489C temperature range as 0°C to 70°C. The device maintains full electrical specifications - including 2 ppm INL and 1 ppm offset error - across this range without derating.
Does the LTC2489CDE#TRPBF require external reference components?
No, the LTC2489CDE#TRPBF accepts an external differential reference but does not require external reference ICs. It supports direct connection of REF+ to VCC and REF– to GND for simplest operation, or any differential voltage from 0.1 V to VCC. Its reference common-mode rejection exceeds 120 dB DC, allowing stable operation even with noisy or unregulated supplies used as reference sources.
How does the Easy Drive technology in the LTC2489CDE#TRPBF eliminate input current errors?
The LTC2489CDE#TRPBF uses a patented passive sampling network that automatically cancels differential input current through matched capacitive charge redistribution. This eliminates dynamic current-induced errors on high-impedance sources - verified by <10 nA typical IN+/IN– leakage - enabling direct digitization of sensors with source impedances up to 100 kΩ while maintaining full 16-bit DC accuracy without external buffers.
Can the LTC2489CDE#TRPBF perform simultaneous 50 Hz and 60 Hz rejection with external clock?
Yes - simultaneous 50 Hz/60 Hz rejection is maintained with external clock on the fO pin, provided fEOSC is set to 280 kHz ±2% as specified in Note 9. The digital filter's notch characteristics are reconfigured based on the external clock frequency, preserving rejection depth >87 dB for both frequencies without firmware intervention or register writes.
What is the function of the exposed pad (Pin 15) on the LTC2489CDE#TRPBF DFN package?
The exposed pad (Pin 15) on the LTC2489CDE#TRPBF is electrically connected to GND and serves as the primary thermal and electrical ground path. Per the datasheet, it must be soldered to the PCB ground plane to ensure proper thermal dissipation (θJA = 37°C/W) and low-noise analog performance. Leaving it floating degrades noise, linearity, and thermal reliability - it is not optional for production use.
LTC2489CDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC2489CDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2489CDE#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 LTC2489CDE#TRPBF reliable?
The price and inventory of LTC2489CDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2489CDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2489CDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2489CDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2489CDE#TRPBF?
LTC2489CDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2489CDE#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 LTC2489CDE#TRPBF?
For technical support, including LTC2489CDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2489CDE#TRPBF requirements.
6.How does Aetrix verify that LTC2489CDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2489CDE#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 LTC2489CDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2489CDE#TRPBF?
All LTC2489CDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2489CDE#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 LTC2489CDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC2489CDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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