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Analog Devices Inc. LTC2431IMS#TRPBF
- Part No.:
- LTC2431IMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2431IMS#TRPBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,409
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Product details
Overview
LTC2431IMS#TRPBF from Analog Devices (formerly Linear Technology) is a 20-bit micropower delta-sigma analog-to-digital converter with differential input and reference, integrated oscillator, 3ppm INL, 0.56ppm RMS noise, and single-cycle settling. It operates from 2.7V to 5.5V and delivers 110dB 50/60Hz notch rejection for precision sensor digitization in industrial instrumentation and weigh scales.
For engineers reviewing the LTC2431IMS#TRPBF datasheet, LTC2431IMS#TRPBF pinout, LTC2431IMS#TRPBF application, or LTC2431IMS#TRPBF equivalent, this page provides verified technical context, package mapping, real-world use-value analysis, and validated alternative options for low-noise, low-power, high-accuracy DC measurement systems requiring ratiometric flexibility and no-latency conversion.
Technical Context
The LTC2431IMS#TRPBF implements a decimating FIR filter with internal oscillator-based clocking, enabling fixed 50Hz or 60Hz notch placement via FO pin configuration-no external components required. Its auto-calibration engine performs offset and full-scale correction every conversion cycle, ensuring stability over temperature and supply voltage drift.
It supports both internal and external SCK modes, with bidirectional SCK pin behavior determined at power-up or CS falling edge. The 3-wire SPI/MICROWIRE-compatible interface delivers 24-bit output with no latency: each data word corresponds precisely to the most recent completed conversion, eliminating filter settling delay in multiplexed sensor systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit, no missing codes-guarantees monotonicity and full dynamic range utilization in precision DC measurements. |
| INL | 3ppm of VREF-enables sub-0.001% linearity error in 5V reference systems, critical for strain gauge and load cell applications. |
| RMS Noise | 0.56ppm (2.8µVRMS at 5V)-supports >20.8 ENOB for ultra-low-noise DC signal acquisition without external filtering. |
| Supply Current | 200µA in conversion mode, 4µA in autosleep-enables battery-powered operation with rapid wake-on-CS activation. |
| Common Mode Rejection | 120dB DC, 140dB at 50/60Hz-rejects ground loop interference and power-line coupling in industrial sensor front-ends. |
| Input Range | –0.5VREF to +0.5VREF differential, GND–0.3V to VCC+0.3V common mode-allows direct interfacing with transducers operating near rail or below ground. |
| Reference Range | 0.1V to VCC differential-enables flexible ratiometric sensing with low-voltage references or remote sensing configurations. |
Pinout & Package
Package: 16-lead plastic SSOP (Small Outline Package), 0.150" wide, moisture sensitivity level MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,7,8,9,10,15,16) | Ground reference and return path | Seven dedicated ground pins ensure low-impedance return paths for analog, digital, and power currents-mandatory for noise-sensitive 20-bit performance. |
| VCC (Pin 2) | Positive supply input | 2.7V–5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypass to GND for stable conversion accuracy. |
| REF+ / REF– (Pins 3,4) | Differential reference inputs | Accept 0.1V–VCC differential voltage; common-mode range spans GND to VCC-enables true ratiometric and isolated sensor interfaces. |
| IN+ / IN– (Pins 5,6) | Differential analog inputs | Support –0.5VREF to +0.5VREF differential range with GND–0.3V to VCC+0.3V absolute input limits-accommodates transducer offsets and bipolar signals. |
| CS (Pin 11) | Active-low chip select | Wakes ADC from 4µA sleep mode; aborts data transfer if pulled high mid-readout and initiates new conversion. |
| SDO (Pin 12) | Three-state serial data output | Outputs 24-bit conversion result on falling SCK edge; serves as conversion status indicator when CS is low and no SCK active. |
| SCK (Pin 13) | Bidirectional serial clock | Functions as output (internal clock mode) or input (external clock mode); mode selected at power-up or CS falling edge. |
| FO (Pin 14) | Frequency control input | Selects internal 50Hz (FO=VCC) or 60Hz (FO=GND) notch; accepts external clock (fEOSC) for user-defined rejection at fEOSC/2560. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency delta-sigma architecture | Single-cycle digital filter settling ensures each 24-bit output corresponds exactly to the most recent analog conversion-eliminates timing uncertainty in multiplexed sensor arrays. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction removes drift due to temperature, aging, and supply variation-no calibration registers or host intervention required. |
| Flexible 50/60Hz line rejection | Configurable notch via FO pin eliminates need for external crystal or clock source while maintaining >110dB rejection at ±2% frequency tolerance. |
| True differential input and reference | Independent GND-to-VCC common-mode ranges for IN+/IN– and REF+/REF– enable robust remote sensing and floating transducer interfaces without level-shifting circuitry. |
| Ultra-low sleep current | 4µA autosleep mode reduces average power in intermittent-read applications-extends battery life in portable DVMs and handheld instruments. |
Applications
| Industrial Weigh Scales | Strain Gauge Transducers |
|---|---|
Use Scenario: High-precision weight measurement in platform scales and hopper load cells under variable ambient conditions. IC Role / Device Role / Timing Role: Direct digitizer of mV-level bridge outputs with ratiometric reference derived from excitation voltage. Use Value: 3ppm INL and 0.56ppm noise enable 1:1,000,000 resolution without external amplification or averaging-reducing BOM count and PCB area. | Use Scenario: Static and quasi-static force monitoring in structural health sensors and test fixtures. IC Role / Device Role / Timing Role: Low-drift, low-noise ADC capturing microstrain-induced voltage shifts across Wheatstone bridges. Use Value: Per-conversion auto-calibration maintains <1ppm/°C offset drift over –40°C to 85°C-ensuring long-term measurement fidelity without recalibration. |
| Portable DVMs and Meters | Gas Analyzers |
Use Scenario: Battery-powered handheld multimeters requiring >5½-digit accuracy and multi-year battery life. IC Role / Device Role / Timing Role: Core ADC for DC voltage/current/resistance measurement with autoranging and auto-zero capability. Use Value: 200µA conversion + 4µA sleep current enables >1000 readings per AA battery-meeting IEC 61010 portability requirements. | Use Scenario: Electrochemical gas detection where ppm-level concentration changes produce nA-level current signals. IC Role / Device Role / Timing Role: Precision integrator ADC converting transimpedance amplifier output into calibrated concentration values. Use Value: 120dB DC common-mode rejection suppresses EMI from pump motors and heaters-improving signal integrity in noisy industrial enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-accuracy, low-power ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPW | 24-bit, 4kSPS, integrated PGA and burnout current sources; requires external reference; higher supply current (350µA active). | Better suited for multi-channel sensor arrays with programmable gain; less optimal for ultra-low-power single-sensor systems. | Select when PGA flexibility and channel multiplexing outweigh lowest possible sleep current and self-contained reference support. |
| LTC2411IMS#TRPBF | 24-bit, pin-compatible upgrade with improved 0.5ppm noise and 2ppm INL; same MSOP-16 footprint and interface; higher cost. | Direct drop-in replacement offering enhanced resolution for next-generation instrumentation where 24-bit ENOB is mandatory. | Select when system-level accuracy budget demands <1ppm noise floor and legacy board compatibility is required. |
Compared with ADS124S08IPW and LTC2411IMS#TRPBF, the LTC2431IMS#TRPBF offers the lowest power envelope and simplest BOM for 20-bit ratiometric DC measurement-trading raw bit count for guaranteed no-latency operation, integrated oscillator, and seven-ground-pin noise immunity.
Availability
LTC2431IMS#TRPBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and precision weigh scale applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2431IMS#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2431IMS#TRPBF belongs to ADI's legacy Linear Technology precision ADC family, designed specifically for ultra-low-noise, micropower, direct-sensor-digitization applications where calibration stability and line-frequency rejection are critical.
FAQ
What is the maximum recommended reference voltage for the LTC2431IMS#TRPBF?
The LTC2431IMS#TRPBF accepts a differential reference voltage (VREF = REF+ – REF–) up to VCC, with minimum 0.1V. For optimal noise and INL performance at 5V supply, VREF = 5V is supported and specified-enabling full-scale input range of ±2.5V with 3ppm INL and 0.56ppm RMS noise. Reference common-mode voltage (VREFCM) may be set independently anywhere from GND to VCC.
Does the LTC2431IMS#TRPBF require external passive components for its internal oscillator?
No, the LTC2431IMS#TRPBF integrates a precision oscillator that requires no external capacitors, crystals, or resistors. When FO is tied to GND or VCC, the device automatically configures for 60Hz or 50Hz notch filtering respectively-delivering >110dB rejection without any external frequency-setting components.
How does the LTC2431IMS#TRPBF achieve no-latency conversion?
The LTC2431IMS#TRPBF achieves no-latency conversion through a decimating FIR filter architecture that settles fully within one conversion cycle. Unlike traditional delta-sigma converters requiring multiple output words to stabilize after an input step, every 24-bit output from the LTC2431IMS#TRPBF corresponds precisely to the most recently completed analog conversion-enabling deterministic timing in multiplexed sensor systems.
What is the function of the seven GND pins on the LTC2431IMS#TRPBF SSOP package?
The seven GND pins (Pins 1,7,8,9,10,15,16) on the LTC2431IMS#TRPBF provide separate low-impedance return paths for analog input, reference, digital I/O, and power supply currents. This physical separation minimizes crosstalk and ground bounce-critical for preserving 20-bit accuracy and 120dB common-mode rejection in mixed-signal layouts.
Can the LTC2431IMS#TRPBF operate with a 3.3V supply and 2.5V reference?
Yes, the LTC2431IMS#TRPBF is fully specified for 2.7V to 5.5V operation. With VCC = 3.3V and VREF = 2.5V, it delivers 10ppm full-scale error, 1ppm offset, and 0.56ppm RMS noise-maintaining 20.8 ENOB. Input common-mode range remains GND–0.3V to VCC+0.3V, and reference common-mode supports independent setting from GND to VCC.
LTC2431IMS#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- microPOWER™
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC2431IMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2431IMS#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 LTC2431IMS#TRPBF reliable?
The price and inventory of LTC2431IMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2431IMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2431IMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2431IMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2431IMS#TRPBF?
LTC2431IMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2431IMS#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 LTC2431IMS#TRPBF?
For technical support, including LTC2431IMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2431IMS#TRPBF requirements.
6.How does Aetrix verify that LTC2431IMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2431IMS#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 LTC2431IMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2431IMS#TRPBF?
All LTC2431IMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2431IMS#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 LTC2431IMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC2431IMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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