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Analog Devices Inc. LTC2489IDE#PBF
- Part No.:
- LTC2489IDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC2489IDE#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:272
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Product details
Overview
LTC2489IDE#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, no-latency delta-sigma ADC with 4 single-ended or 2 differential analog inputs, I²C interface, Easy Drive input current cancellation, and integrated oscillator. 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 temperature monitoring systems.
For engineers reviewing the LTC2489IDE#PBF datasheet, LTC2489IDE#PBF pinout, LTC2489IDE#PBF application, or LTC2489IDE#PBF equivalent, key selection criteria include rail-to-rail input support with zero differential input current, GND-to-VCC common-mode range independent of reference voltage, guaranteed no missing codes, and seamless channel switching with first-conversion validity after multiplexer reconfiguration.
Technical Context
The LTC2489IDE#PBF implements a 3rd-order delta-sigma modulator with decimating FIR filter and automatic per-conversion offset/full-scale calibration. Its patented Easy Drive architecture cancels differential input current via passive sampling network, eliminating dynamic errors without on-chip buffers.
It supports internal 307.2 kHz oscillator or external clock (10–1000 kHz) for configurable data rate and notch placement; features 9-pin-selectable I²C addresses plus global sync address; and maintains 140 dB DC input common-mode rejection and 87 dB 50/60 Hz normal-mode rejection across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - ensures monotonic transfer function and unambiguous digital representation across full input range. |
| INL | 2 ppm of VREF - enables sub-μV linearity error in precision sensor interfaces with 5 V reference. |
| Offset Error | ±0.5 µV typical - eliminates need for system-level offset trimming in low-drift instrumentation designs. |
| Noise | 600 nV RMS - corresponds to 0.02 LSB transition noise at 5 V reference, supporting 16-bit effective resolution. |
| Supply Range | 2.7 V to 5.5 V - allows operation from single Li-ion cell or standard 3.3 V/5 V rails with 0.8 mW typical power. |
| Input Configuration | 4 single-ended or 2 differential channels - supports flexible sensor interfacing including thermocouples, RTDs, and bridge transducers. |
| Rejection | Simultaneous 50 Hz and 60 Hz - removes mains interference without external filtering or software averaging. |
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 (Pin 1) | Frequency control input | Selects internal oscillator (GND) or external clock (10–1000 kHz); determines conversion rate and digital filter null placement. |
| CA0, CA1 (Pins 2, 3) | I²C address configuration | Three-state pins (LOW/HIGH/FLOAT) set one of nine device addresses; enable multi-drop bus operation. |
| SCL (Pin 4) | I²C serial clock input | Slave-only interface; accepts up to 400 kHz clock; defines timing for SDA data sampling and output latching. |
| SDA (Pin 5) | Bidirectional I²C data line | Open-drain output during read (24-bit conversion result), high-impedance input during write (8-bit channel select). |
| GND (Pin 6) | Analog/digital ground reference | Common return for supply, reference, and analog inputs; requires low-impedance PCB connection. |
| COM (Pin 7) | Common negative input | Shared IN– for all single-ended configurations; supports rail-to-rail voltage (GND – 0.3 V to VCC + 0.3 V). |
| CH0–CH3 (Pins 8–11) | Analog input channels | Programmable as IN+ or IN–; differential pairs (e.g., CH0/CH1) or single-ended vs COM; tolerate ±0.3 V beyond rails. |
| VCC (Pin 12) | Positive supply | 2.7 V–5.5 V operation; requires 10 μF tantalum + 0.1 μF ceramic bypass close to pin. |
| REF+, REF– (Pins 13, 14) | Differential reference inputs | Set full-scale range (0.1 V to VCC); common-mode range = GND to VCC; no external buffer needed. |
| Exposed Pad (Pin 15) | Thermal & electrical ground | Must be soldered to PCB ground plane for thermal dissipation (θJA = 37°C/W) and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| No latency conversion | Digital filter settles in one cycle; first result after channel change is fully accurate - eliminates wait states in multiplexed sensor systems. |
| Easy Drive input current cancellation | Zero differential input current enables direct connection of >1 MΩ source impedances without gain/offset degradation. |
| Auto-calibration per conversion | Continuous offset and full-scale correction removes drift from temperature, supply, and channel switching - no user intervention required. |
| Rail-to-rail input with GND-to-VCC common mode | Inputs operate independently of reference voltage; supports single-supply systems measuring signals from GND to VCC. |
| Integrated oscillator | On-chip 307.2 kHz clock eliminates external crystal; simplifies BOM and layout while enabling precise 50/60 Hz rejection. |
Applications
| Industrial Temperature Monitoring | Bridge Sensor Digitization |
|---|---|
Use Scenario: Measuring RTD or thermistor outputs in programmable logic controllers with long sensor leads and noisy factory environments. IC Role / Device Role / Timing Role: Direct sensor digitizer with simultaneous 50/60 Hz rejection and auto-calibration - replaces signal conditioning amplifier + external ADC + anti-aliasing filter. Use Value: Eliminates external op-amps and precision resistors; maintains 16-bit accuracy despite lead resistance and EMI, reducing component count by ≥40%. |
Use Scenario: Reading strain gauge or load cell outputs in weigh scales where excitation voltage varies and thermal drift affects zero point. IC Role / Device Role / Timing Role: Delta-sigma ADC with per-conversion offset/full-scale calibration - continuously corrects for excitation drift and temperature-induced zero shift. Use Value: Achieves <1 ppm/°C zero drift stability without manual recalibration; enables Class III legal-for-trade accuracy with single-chip solution. |
| Portable Battery-Powered Instrumentation | Process Control Loop Sensors |
Use Scenario: Handheld multimeter or environmental logger using coin-cell battery with strict power budget and wide input range requirements. IC Role / Device Role / Timing Role: Low-power ADC with 1 µA sleep current and rail-to-rail inputs - digitizes sensor outputs directly without level-shifting or biasing networks. Use Value: Extends battery life to >1 year; supports single-supply operation from 2.7 V while accepting inputs down to GND and up to VCC. |
Use Scenario: 4–20 mA loop-powered transmitters digitizing pressure or flow sensor outputs in hazardous area field devices. IC Role / Device Role / Timing Role: High-accuracy ADC with GND-to-VCC common-mode range and 140 dB CMRR - rejects common-mode noise from shared ground returns. Use Value: Maintains 16-bit integrity in electrically noisy plant environments; eliminates need for isolated signal conditioners in SIL-2 compliant designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 16-bit, 4-channel, I²C, but lacks Easy Drive - differential input current limits source impedance to <10 kΩ without external buffering. | Requires op-amp front-end for high-Z sensors; no simultaneous 50/60 Hz rejection - needs software averaging or external notch filters. | Choose when cost sensitivity outweighs input flexibility and mains rejection; verify external amplification meets system noise floor. |
| MAX11200EEE+ | 18-bit, 1-channel, SPI interface, no integrated oscillator - requires external clock and separate channel multiplexing. | Not pin-compatible; demands external MUX and timing control logic; higher resolution but lower channel density and no auto-calibration. | Prefer for ultra-high-precision single-channel applications where 18-bit resolution justifies added complexity and board space. |
Compared with ADS1115IDGSR and MAX11200EEE+, the LTC2489IDE#PBF uniquely combines true rail-to-rail inputs with zero differential input current, built-in 50/60 Hz rejection, and per-conversion auto-calibration - delivering verified 16-bit accuracy across all four channels without external components or firmware overhead.
Availability
LTC2489IDE#PBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and sensor fusion modules requiring stable component supply across extended temperature ranges.
Supply support for LTC2489IDE#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 LTC2489IDE#PBF belongs to Linear's precision delta-sigma ADC product line, designed specifically for direct sensor digitization in harsh industrial and battery-operated environments where accuracy, low power, and ease of use are critical.
FAQ
What is the operating temperature range of the LTC2489IDE#PBF?
The LTC2489IDE#PBF is rated for –40°C to +85°C ambient operation, making it suitable for industrial and automotive under-hood applications. This grade is confirmed by the "I" suffix in the part number and validated across all electrical specifications including INL, offset error, and 50/60 Hz rejection performance.
Does the LTC2489IDE#PBF require external components for basic operation?
No - the LTC2489IDE#PBF operates with only two external capacitors: a 10 µF tantalum and 0.1 µF ceramic capacitor on VCC. Its integrated oscillator, Easy Drive front end, and auto-calibration eliminate the need for external clocks, op-amps, or precision resistors typically required by competing ADCs.
How does the Easy Drive technology in the LTC2489IDE#PBF improve sensor interfacing?
Easy Drive cancels differential input current via a proprietary passive sampling network, enabling direct connection of high-impedance sensors (e.g., thermistors, pH electrodes) without gain/offset errors. This allows full 16-bit accuracy even with source impedances >1 MΩ - a capability not supported by standard delta-sigma ADCs like the LTC2489IDE#PBF's nearest alternatives.
Can the LTC2489IDE#PBF perform simultaneous 50 Hz and 60 Hz rejection without external filtering?
Yes - the LTC2489IDE#PBF's digital filter is inherently configured to reject both 50 Hz and 60 Hz line frequencies simultaneously when using its internal 307.2 kHz oscillator. This is achieved through deterministic notch placement in the decimating FIR filter, requiring no external hardware or firmware configuration.
What is the significance of "no latency" in the LTC2489IDE#PBF's operation?
"No latency" means the LTC2489IDE#PBF's digital filter settles in a single conversion cycle - the first output after selecting a new channel is fully accurate to datasheet specifications. This eliminates dead time in multiplexed systems and enables real-time channel scanning without sacrificing measurement fidelity.
LTC2489IDE#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 14-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2489IDE#PBF FAQ
1.How can I place an order for LTC2489IDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2489IDE#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 LTC2489IDE#PBF reliable?
The price and inventory of LTC2489IDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2489IDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC2489IDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2489IDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2489IDE#PBF?
LTC2489IDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2489IDE#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 LTC2489IDE#PBF?
For technical support, including LTC2489IDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2489IDE#PBF requirements.
6.How does Aetrix verify that LTC2489IDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2489IDE#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 LTC2489IDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC2489IDE#PBF?
All LTC2489IDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2489IDE#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 LTC2489IDE#PBF part is unused and in its original packaging.
Return procedure for LTC2489IDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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