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Analog Devices Inc. LTC2431IMS#PBF
- Part No.:
- LTC2431IMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2431IMS#PBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,929
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Product details
Overview
LTC2431IMS#PBF from Analog Devices (formerly Linear Technology) is a 20-bit no-latency delta-sigma analog-to-digital converter with differential input and reference, 3ppm INL, 0.56ppm RMS noise, and integrated oscillator for 50Hz/60Hz notch filtering. It operates from 2.7V to 5.5V, draws only 200µA during conversion, and supports ratiometric sensor digitization in industrial instrumentation and precision weighing systems.
For engineers reviewing the LTC2431IMS#PBF datasheet, LTC2431IMS#PBF pinout, LTC2431IMS#PBF application, or LTC2431IMS#PBF equivalent, this device delivers single-cycle settling, ±0.5VREF input range, GND-to-VCC common-mode flexibility, and SPI/MICROWIRE-compatible 3-wire interface - critical for low-drift, high-rejection DC measurement designs.
Technical Context
The LTC2431IMS#PBF implements a decimating FIR filter with internal oscillator-based clocking, enabling precise 50Hz or 60Hz line-frequency rejection without external components. Its auto-calibration engine performs offset and full-scale correction every conversion cycle, ensuring stability over temperature and supply voltage variation.
It uses a true differential front-end where both input (IN+/IN–) and reference (REF+/REF–) common-mode voltages are independently configurable from GND to VCC, supporting remote sensing and floating transducer interfaces. The FO pin selects internal 50Hz/60Hz nulls or accepts external clock for user-defined rejection frequencies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit with no missing codes - guarantees monotonicity and unambiguous digital representation across full scale. |
| INL | 3ppm of VREF - enables sub-10ppm system-level accuracy in precision bridge sensor applications. |
| RMS Noise | 0.56ppm of VREF (2.8µVRMS at 5V reference) - supports >20.8 ENOB for high-fidelity DC measurements. |
| Supply Current | 200µA in conversion mode, 4µA in autosleep - allows battery-powered operation with duty-cycled wake-up. |
| Common-Mode Rejection | 120dB DC, 140dB at 50/60Hz - rejects ground shifts and power-line interference in noisy industrial environments. |
| Input Range | ±0.5VREF differential, with IN+/IN– common mode from GND–0.3V to VCC+0.3V - accommodates wide-range transducer outputs and level-shifting circuits. |
| Reference Range | 0.1V to VCC differential, REF+/REF– common mode from GND to VCC - enables flexible ratiometric or isolated reference configurations. |
Pinout & Package
Package: 16-lead plastic SSOP (Small Outline Package), 0.150" body width, exposed pad not present. Pin pitch: 0.025", footprint compliant with JEDEC MS-013AC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 7, 8, 9, 10, 15, 16) | Ground reference and return path | Seven dedicated ground pins minimize ground impedance and improve PSRR; all must be connected to PCB ground plane. |
| VCC (Pin 2) | Positive supply input | 2.7V–5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypass to GND for stable conversion performance. |
| REF+ / REF– (Pins 3, 4) | Differential reference inputs | Accept 0.1V–VCC differential voltage; common-mode range spans GND to VCC - supports remote or floating references. |
| IN+ / IN– (Pins 5, 6) | Differential analog inputs | Support ±0.5VREF full-scale range; absolute voltage range extends beyond supply rails (GND–0.3V to VCC+0.3V). |
| CS (Pin 11) | Active-low chip select | Wakes ADC from sleep (4µA) into conversion mode; controls SDO output enable and aborts ongoing data transfer if raised mid-read. |
| SDO (Pin 12) | Three-state serial data output | Outputs 24-bit conversion result; floats to Hi-Z when CS = HIGH; serves as conversion status indicator during Sleep/Convert states. |
| SCK (Pin 13) | Bidirectional serial clock | Functions as output (internal clock mode) or input (external clock mode); mode auto-selected at power-up or CS falling edge. |
| FO (Pin 14) | Frequency control input | Selects internal 50Hz (FO = VCC) or 60Hz (FO = GND) notch; or accepts external fEOSC for custom rejection at fEOSC/2560. |
Key Features
| Feature | Design Value |
|---|---|
| No latency conversion | Digital filter settles in one cycle - each 24-bit output corresponds exactly to the most recent analog sample, enabling true multiplexed sensor acquisition. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction eliminates drift-related errors over time, temperature, and supply variation without interrupting operation. |
| Configurable 50/60Hz rejection | Single-pin FO selection enables >110dB line-frequency rejection without external filters or software compensation - critical for AC-coupled industrial sites. |
| True differential input & reference | Independent GND-to-VCC common-mode ranges on IN+/IN– and REF+/REF– allow direct connection to unbuffered strain gauges, RTDs, and isolated signal sources. |
| Low-power sleep mode | 4µA quiescent current with indefinite result retention in static shift register - ideal for microcontroller-driven intermittent sampling architectures. |
Applications
| Weight Scales | Industrial Process Control |
|---|---|
|
Use Scenario: High-precision load cell readout in platform scales and hopper systems requiring <10ppm repeatability under varying ambient conditions. IC Role / Device Role / Timing Role: Direct digitizer for mV/V bridge outputs; provides ratiometric measurement using same excitation source as reference. Use Value: 3ppm INL and 0.56ppm RMS noise enable 1:1,000,000 resolution without external amplification or averaging. |
Use Scenario: Analog input module for PLCs monitoring pressure, flow, and temperature in chemical processing plants with high EMI exposure. IC Role / Device Role / Timing Role: Isolated sensor interface ADC with programmable 50Hz/60Hz rejection synchronized to local mains frequency. Use Value: 140dB 50/60Hz normal-mode rejection and 120dB DC common-mode rejection suppress induced noise in long cable runs. |
| Direct Temperature Measurement | Data Acquisition Systems |
|
Use Scenario: Cold-junction compensation and thermocouple linearization in portable handheld DMMs and thermal scanners. IC Role / Device Role / Timing Role: Precision reference-stable ADC for measuring µV-level thermocouple outputs with cold-junction RTD biasing. Use Value: GND-to-VCC REF+/REF– common-mode range allows direct use of on-chip RTD bias without level-shifting circuitry. |
Use Scenario: Modular DAQ card for lab-grade bench instruments requiring calibrated, low-drift DC voltage acquisition. IC Role / Device Role / Timing Role: Core 20-bit converter in multi-channel synchronized sampling architecture with per-channel gain/offset calibration. Use Value: Single-cycle settling and no-latency output enable deterministic timing for triggered acquisitions and real-time waveform capture. |
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 |
|---|---|---|---|
| ADS124S08IPWR | 24-bit resolution, 2.5V internal reference, fixed 50/60Hz rejection, SPI-only interface, no FO pin configuration | Requires external reference buffering for ratiometric sensors; lacks independent REF+/REF– common-mode flexibility | Preferred when higher resolution is mandatory and system-level calibration can compensate for reduced common-mode range. |
| LTC2440CGN#PBF | 24-bit resolution, 110dB 50/60Hz rejection, 16-pin SOIC package, higher supply current (350µA) | Same pin-compatible family but larger package and no 16-lead SSOP option; lacks autosleep mode | Selected when legacy board layout compatibility with LTC24xx GN package is required and sleep current is non-critical. |
Compared with ADS124S08IPWR and LTC2440CGN#PBF, the LTC2431IMS#PBF uniquely combines 20-bit precision with 4µA autosleep, seven-ground-pin SSOP packaging, and fully independent GND-to-VCC common-mode support on both input and reference - making it optimal for space-constrained, battery-aware, and floating-sensor applications.
Availability
LTC2431IMS#PBF is available at Aetrix Electronics and suitable for industrial process control, precision weighing systems, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2431IMS#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 LTC2431IMS#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy DC measurement applications where line-frequency rejection, ratiometric integrity, and minimal external components are essential.
FAQ
What is the operating temperature range for the LTC2431IMS#PBF?
The LTC2431IMS#PBF is rated for –40°C to +85°C operation (industrial grade). This range is confirmed in the Absolute Maximum Ratings table and applies to all electrical specifications unless otherwise noted. The "I" suffix in the part number explicitly denotes the industrial temperature grade, distinguishing it from the commercial-grade "C" variant (0°C to 70°C).
Does the LTC2431IMS#PBF require external passive components for its internal oscillator?
No, the LTC2431IMS#PBF requires no external components for oscillator operation. Its integrated oscillator generates precise timing for the delta-sigma modulator and digital filter, enabling guaranteed 110dB minimum 50Hz/60Hz rejection without crystals, capacitors, or resistors - a key feature highlighted in the datasheet's "Features" and "Description" sections.
Can the LTC2431IMS#PBF interface directly with a 3.3V microcontroller SPI bus?
Yes, the LTC2431IMS#PBF supports 3.3V logic levels: VIH is specified at 2.0V (min) for VCC = 2.7V–3.3V, and VOL is 0.4V (max) at 1.6mA sink. Its SDO output is three-state and compatible with standard SPI clock/data timing - confirmed by timing parameters tKQMAX (220ns), tKQMIN (15ns), and tDOUT_ISCK (1.22–1.28ms) in the datasheet.
How does the FO pin affect conversion time in the LTC2431IMS#PBF?
When FO = GND, conversion time is 130.86–136.20ms (60Hz mode); when FO = VCC, it increases to 157.03–163.44ms (50Hz mode). These values are measured and guaranteed in the Electrical Characteristics table. External clock operation yields conversion time = 20510/fEOSC (kHz), allowing trade-offs between rejection frequency and throughput.
Is the LTC2431IMS#PBF pin-compatible with other devices in the LTC24xx family?
The LTC2431IMS#PBF shares the same 16-pin SSOP footprint and pin functions with the LTC2430IMS#PBF, but differs from the 10-pin MSOP variants (e.g., LTC2431CMS). It is explicitly noted as pin-compatible with the 24-bit LTC2410/LTC2411 in the datasheet's Features section - though resolution and noise performance differ, the physical layout and signal mapping align for drop-in replacement in certain layouts.
LTC2431IMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 20
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- 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:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2431IMS#PBF FAQ
1.How can I place an order for LTC2431IMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2431IMS#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 LTC2431IMS#PBF reliable?
The price and inventory of LTC2431IMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2431IMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC2431IMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2431IMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2431IMS#PBF?
LTC2431IMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2431IMS#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 LTC2431IMS#PBF?
For technical support, including LTC2431IMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2431IMS#PBF requirements.
6.How does Aetrix verify that LTC2431IMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2431IMS#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 LTC2431IMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC2431IMS#PBF?
All LTC2431IMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2431IMS#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 LTC2431IMS#PBF part is unused and in its original packaging.
Return procedure for LTC2431IMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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