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Analog Devices Inc. LTC2431CMS#TRPBF
- Part No.:
- LTC2431CMS#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2431CMS#TRPBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,954
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Product details
Overview
LTC2431CMS#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-ideal for precision weigh scales, strain gauge transducers, and industrial process control where low drift and high common-mode rejection are critical.
For engineers reviewing the LTC2431CMS#TRPBF datasheet, LTC2431CMS#TRPBF pinout, LTC2431CMS#TRPBF application, or LTC2431CMS#TRPBF equivalent, key selection considerations include its 20-bit no-latency architecture, GND-to-VCC input/reference common-mode range, internal oscillator eliminating external timing components, and compatibility with SPI/MICROWIRE interfaces in both internal and external clock modes.
Technical Context
The LTC2431CMS#TRPBF implements a decimating FIR filter with a Sinc³-like response synchronized to an on-chip oscillator, enabling deterministic 50Hz or 60Hz notch placement via the FO pin (GND = 60Hz, VCC = 50Hz). Its autocalibration engine performs offset and full-scale correction every conversion cycle without interrupting operation.
It supports two serial interface timing modes: internal SCK output (driven by internal oscillator at 19.2kHz) or external SCK input (up to 2MHz), selected automatically at power-up or CS edge. The 3-wire interface (CS, SDO, SCK) requires no configuration registers and guarantees one-to-one correspondence between conversion and output data-no latency or filter settling delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit with no missing codes-guarantees monotonicity and full code coverage across full input range. |
| INL | 3ppm of VREF (max)-enables <1 LSB error at 20-bit resolution with 5V reference, critical for metrology-grade accuracy. |
| RMS Noise | 0.56ppm of VREF (typical)-translates to ~2.8µV RMS at 5V reference, supporting 20.8 ENOB in low-frequency applications. |
| Supply Current | 200µA in conversion mode, 4µA in autosleep-enables battery-powered instrumentation with multi-year runtime. |
| Common-Mode Rejection | >120dB DC, >140dB at 50/60Hz-rejects ground loops and power-line interference in noisy industrial environments. |
| Input Range | –0.5VREF to +0.5VREF differential, with VINCM and VREFCM independently set from GND to VCC-supports ratiometric sensing and remote voltage references. |
| Notch Frequency | Configurable 50Hz or 60Hz ±2% rejection via FO pin-eliminates need for external line-frequency filtering in global deployments. |
Pinout & Package
Package: 16-lead plastic SSOP (Small Outline Package), 0.150" body width, JEDEC MO-153 compliant. Pin pitch: 0.025", footprint optimized for automated assembly and thermal performance in industrial PCB layouts.
| 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 for stable conversion performance. |
| REF+ / REF– (Pins 3,4) | Differential reference inputs | Accept 0.1V–VCC differential reference; common-mode range spans GND to VCC-enables flexible ratiometric or isolated reference topologies. |
| IN+ / IN– (Pins 5,6) | Differential analog inputs | Support –0.5VREF to +0.5VREF differential input with GND–0.3V to VCC+0.3V absolute range-tolerates sensor offset and cable drop. |
| CS (Pin 11) | Active-low chip select | Controls power state: LOW enables data output and wakes ADC; HIGH forces autosleep (4µA), preserving conversion result in static register. |
| SDO (Pin 12) | Three-state serial data output | Outputs 24-bit conversion result MSB-first on falling SCK edge; high-Z when CS = HIGH-allows bus sharing with other SPI peripherals. |
| SCK (Pin 13) | Bidirectional serial clock | Auto-configures as internal clock output (19.2kHz) or external clock input (≤2MHz) based on logic level at power-up or CS edge. |
| FO (Pin 14) | Frequency control input | Selects internal oscillator mode: GND → 60Hz notch, VCC → 50Hz notch, or external clock → fEOSC/2560 first null-no external components required. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Single-cycle digital filter settling ensures each 24-bit output corresponds exactly to the most recent analog sample-enables true multiplexed sensor acquisition without inter-channel delay. |
| Per-conversion calibration | Automatic offset and full-scale correction applied every cycle eliminates long-term drift and reduces sensitivity to temperature, supply, and aging effects-no user intervention required. |
| Flexible reference architecture | Differential reference with independent GND-to-VCC common-mode range allows direct connection to bridge sensors, isolated amplifiers, or remote references without level-shifting circuitry. |
| Ultra-low power sleep mode | 4µA autosleep current (2µA at 2.7–3.3V) enables energy harvesting and battery-operated designs with duty-cycled measurement intervals. |
| Robust EMI immunity | 140dB 50/60Hz normal-mode rejection and >110dB power supply rejection at line frequency suppress noise in electrically hostile industrial settings. |
Applications
| Weight Scales | Strain Gauge Transducers |
|---|---|
Use Scenario: High-precision platform scales and load cells measuring 0.1g–100kg with <10ppm repeatability. IC Role / Device Role / Timing Role: Direct digitizer for mV/V bridge outputs; provides ratiometric conversion referenced to excitation voltage. Use Value: 3ppm INL and 0.56ppm noise enable sub-gram resolution at 20-bit depth without external amplification or filtering. | Use Scenario: Structural health monitoring in bridges, cranes, and aerospace components using bonded foil or MEMS strain gauges. IC Role / Device Role / Timing Role: Low-drift ADC capturing microstrain-level differential signals under varying ambient temperature and vibration. Use Value: >120dB DC common-mode rejection and per-cycle calibration maintain accuracy across –40°C to 85°C operating range. |
| Industrial Process Control | Gas Analyzers |
Use Scenario: Analog input modules in PLCs and DCS systems acquiring 4–20mA loop signals via precision shunt resistors. IC Role / Device Role / Timing Role: Isolated front-end ADC with programmable 50/60Hz rejection for factory-floor deployment near VFDs and welders. Use Value: Integrated oscillator eliminates timing component count; 16-pin SSOP fits compact DIN-rail I/O module footprints. | Use Scenario: Electrochemical gas sensors (CO, NO₂, O₂) requiring stable baseline tracking and low-noise ppm-level concentration detection. IC Role / Device Role / Timing Role: Low-power, low-drift digitizer for conditioned sensor outputs with minimal self-heating impact on sensitive electrochemical cells. Use Value: 4µA autosleep current extends battery life in portable analyzers; 20.8 ENOB supports <0.1% gas concentration accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 20-bit delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPWR | 24-bit resolution, integrated PGA (1–128×), lower noise (0.15µVRMS), but higher supply current (390µA active). | Requires external reference; lacks built-in 50/60Hz notch-needs digital post-processing or external filtering. | Choose for higher resolution and gain flexibility; avoid if board space or ultra-low power (<200µA) is critical. |
| LTC2440CGN#PBF | 24-bit, 110dB 50/60Hz rejection, same pin-compatible family-but uses 16-lead SOIC (not SSOP) and has higher noise (1.2µVRMS). | Requires external oscillator for notch tuning; lacks integrated oscillator-adds BOM cost and layout complexity. | Choose only if SOIC package is mandated; otherwise LTC2431CMS#TRPBF offers superior noise, lower power, and oscillator integration in smaller SSOP. |
Compared with ADS124S08IPWR and LTC2440CGN#PBF, the LTC2431CMS#TRPBF delivers optimal balance of 20-bit metrological accuracy, 0.56ppm noise, 200µA active current, and fully integrated 50/60Hz rejection-making it the preferred choice for space-constrained, battery-aware industrial sensors where simplicity and proven stability outweigh raw bit count.
Availability
LTC2431CMS#TRPBF is available at Aetrix Electronics and suitable for weight scales, strain gauge transducers, and industrial process control systems requiring stable component supply, long-term calibration integrity, and global 50/60Hz line rejection without external timing components.
Supply support for LTC2431CMS#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 LTC2431CMS#TRPBF belongs to ADI's legacy Linear Technology precision ADC product line, designed specifically for low-power, high-accuracy direct sensor digitization in harsh electrical environments-emphasizing ease of use, inherent stability, and minimal external component count.
FAQ
What is the maximum recommended reference voltage for the LTC2431CMS#TRPBF?
The LTC2431CMS#TRPBF accepts a differential reference voltage (VREF = REF+ – REF–) from 0.1V up to VCC. With VCC rated at 5.5V max, the maximum usable VREF is 5.5V. Operating at VREF = 5V yields optimal noise performance (0.56ppm RMS) and full 20-bit effective resolution, as confirmed in the Electrical Characteristics table under "Output Noise" conditions.
Does the LTC2431CMS#TRPBF require external passive components for its internal oscillator?
No, the LTC2431CMS#TRPBF does not require any external passive components for its internal oscillator. As stated in the datasheet features and functional block diagram, the oscillator is fully integrated and self-contained. The FO pin selects between 50Hz (FO = VCC) or 60Hz (FO = GND) notch modes without crystals, capacitors, or resistors-reducing BOM count and layout risk.
How does the LTC2431CMS#TRPBF achieve single-cycle settling with no latency?
The LTC2431CMS#TRPBF achieves single-cycle settling through a fixed-decimation FIR filter synchronized to its internal oscillator. Unlike conventional sigma-delta converters requiring multiple output samples to settle after an input step, its digital filter completes full settling within one conversion period (133ms typical). Each 24-bit output corresponds precisely to the analog input sampled during that cycle-verified in the "No Latency" feature description and Figure 2 state diagram.
Can the LTC2431CMS#TRPBF operate with a 3.3V supply and still meet its specified INL and noise performance?
Yes, the LTC2431CMS#TRPBF maintains 3ppm INL and 0.56ppm RMS noise performance at 3.3V supply. The Electrical Characteristics table specifies INL "G" (guaranteed over full temperature range) at 4.5V ≤ VCC ≤ 5.5V and 2.5V ≤ REF+ ≤ VCC, while noise is tested at 5V. However, Typical Performance Characteristics (Figures G03, G06, G13) confirm <5ppm TUE and <1.1ppm INL at VCC = 2.7V and VREF = 2.5V-demonstrating robustness across the full 2.7–5.5V range.
What is the function of the seven GND pins on the LTC2431CMS#TRPBF SSOP package?
The seven GND pins (Pins 1, 7, 8, 9, 10, 15, 16) on the LTC2431CMS#TRPBF provide low-impedance return paths for analog, digital, and power-ground currents. They reduce ground bounce, improve PSRR, and enhance thermal dissipation. The datasheet explicitly states "All seven pins must be connected to ground for proper operation"-failure to do so risks increased noise, reduced CMRR, and potential conversion errors.
LTC2431CMS#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2431CMS#TRPBF FAQ
1.How can I place an order for LTC2431CMS#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2431CMS#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 LTC2431CMS#TRPBF reliable?
The price and inventory of LTC2431CMS#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2431CMS#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2431CMS#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2431CMS#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2431CMS#TRPBF?
LTC2431CMS#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2431CMS#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 LTC2431CMS#TRPBF?
For technical support, including LTC2431CMS#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2431CMS#TRPBF requirements.
6.How does Aetrix verify that LTC2431CMS#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2431CMS#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 LTC2431CMS#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2431CMS#TRPBF?
All LTC2431CMS#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2431CMS#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 LTC2431CMS#TRPBF part is unused and in its original packaging.
Return procedure for LTC2431CMS#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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