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Analog Devices Inc. LTC2431CMS#PBF
- Part No.:
- LTC2431CMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2431CMS#PBF.pdf
- Description:
- IC ADC 20BIT SIGMA-DELTA 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:11,474
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Product details
Overview
LTC2431CMS#PBF 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 line-frequency rejection at 50Hz/60Hz for precision sensor digitization in industrial instrumentation and weigh scales.
For engineers reviewing the LTC2431CMS#PBF datasheet, LTC2431CMS#PBF pinout, LTC2431CMS#PBF application, or LTC2431CMS#PBF equivalent, this page provides verified specifications, package mapping, functional alternatives, and design-critical timing and noise performance data - all confirmed for the MSOP-16 package variant with –40°C to 85°C industrial temperature grade.
Technical Context
The LTC2431CMS#PBF implements a decimating FIR filter with no latency-each conversion result is fully settled and accurate immediately after completion, enabling true multiplexed sensor acquisition without settling delay. Its internal oscillator eliminates external timing components and supports configurable 50Hz or 60Hz notch filtering via the FO pin.
It uses continuous auto-calibration per conversion cycle for offset and full-scale correction, ensuring long-term stability against temperature drift, supply variation, and time. The 3-wire SPI/MICROWIRE-compatible interface operates in either internal or external clock mode, with SCK functioning bidirectionally based on power-up configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 20-bit, no missing codes - guarantees monotonicity and unambiguous digital representation across full input range. |
| INL | 3ppm of VREF - enables sub-10ppm system-level accuracy in ratiometric bridge or thermocouple measurements. |
| RMS Noise | 0.56ppm (2.8µVRMS at 5V ref) - supports 20.8 ENOB for high-fidelity low-frequency signal capture. |
| Supply Current | 200µA in conversion mode, 4µA in autosleep - allows battery-powered operation with duty-cycled sensing. |
| Common Mode Rejection | 120dB DC, 140dB at 50/60Hz - rejects ground bounce and EMI in noisy industrial environments. |
| Input Range | ±0.5VREF differential, GND–0.3V to VCC+0.3V common mode - accommodates wide-range transducer outputs and remote sensing topologies. |
| Reference Range | 0.1V to VCC differential - permits flexible ratiometric designs using low-voltage references or direct sensor excitation. |
Pinout & Package
Package: 16-lead plastic SSOP (Small Outline Package), 0.150" body width, exposed pad not present. Pin pitch: 0.025", footprint per JEDEC MO-153.
| 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 for analog, digital, and power domains - 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 minimize supply noise coupling into ADC core. |
| REF+ / REF– (Pins 3,4) | Differential reference inputs | Accept 0.1V–VCC differential voltage; common mode range spans GND to VCC - enables floating or ratiometric reference configurations. |
| IN+ / IN– (Pins 5,6) | Differential analog inputs | Support ±0.5VREF full-scale range with GND–0.3V to VCC+0.3V absolute voltage limits - suitable for direct connection to strain gauges or RTDs. |
| CS (Pin 11) | Active-low chip select | Controls power state: LOW wakes ADC and enables SDO; HIGH forces autosleep (4µA) and places SDO in Hi-Z. |
| SDO (Pin 12) | Three-state serial data output | Outputs 24-bit conversion result on falling edge of SCK; serves as conversion status indicator when CS is LOW and no SCK activity occurs. |
| SCK (Pin 13) | Bidirectional serial clock | Functions as output (internal clock mode) or input (external clock mode); mode selected automatically at power-up or CS falling edge. |
| FO (Pin 14) | Frequency control input | Selects internal oscillator frequency: GND → 60Hz notch, VCC → 50Hz notch, external clock → fEOSC/2560 notch - configures rejection without firmware. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Decimating FIR filter settles in one cycle - each 24-bit output corresponds precisely to its input sample, eliminating dead time in multiplexed systems. |
| Per-conversion auto-calibration | Offset and full-scale corrections applied every cycle - maintains <10ppm drift over temperature and supply variation without user intervention. |
| Configurable 50/60Hz rejection | Single-pin FO selection enables hardware-defined line-frequency notch - avoids software-based digital filtering and associated latency. |
| Flexible reference architecture | Differential reference with 0.1V–VCC range and independent common-mode control - supports both grounded and floating sensor bridges with minimal external circuitry. |
| Ultra-low sleep current | 4µA autosleep mode - extends battery life in portable DVMs and handheld test equipment where measurement duty cycle is low. |
Applications
| Weight Scales | Industrial Process Control |
|---|---|
Use Scenario: High-precision load cell readout in platform scales and hopper weighing systems operating in electrically noisy factory environments. IC Role / Device Role / Timing Role: Direct digitizer for mV-level bridge outputs; performs ratiometric conversion referenced to excitation voltage while rejecting 50/60Hz mains interference. Use Value: 3ppm INL and 140dB 50Hz rejection enable ≤0.001% full-scale accuracy without external filtering or calibration tables. | Use Scenario: Analog input module in PLCs acquiring signals from pressure, flow, and temperature transmitters in chemical plants. IC Role / Device Role / Timing Role: Isolated front-end ADC with wide common-mode input range; interfaces to 4–20mA loops via precision shunt and handles ground potential differences between field and controller. Use Value: GND–0.3V to VCC+0.3V input common mode and 120dB DC CMRR allow reliable operation despite ground shifts up to ±2V. |
| Direct Temperature Measurement | Data Acquisition Systems |
Use Scenario: Cold-junction compensation and thermocouple linearization in oven controllers and environmental chambers. IC Role / Device Role / Timing Role: Simultaneous digitization of thermocouple voltage and RTD resistance (via current source), using shared reference and common-mode control. Use Value: 0.56ppm RMS noise and 20.8 ENOB support <0.1°C resolution over –40°C to +125°C with Type-K thermocouples. | Use Scenario: Modular DAQ card for lab-grade bench instruments requiring high linearity and low power in multi-channel configurations. IC Role / Device Role / Timing Role: Channel-specific ADC with autonomous sleep/wake cycling controlled by host FPGA; 24-bit output synchronized to external trigger. Use Value: Single-cycle settling and 200µA active current allow >100 channels to be serviced by one microcontroller without throughput bottlenecks. |
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, integrated PGA and sensor bias, but higher 350µA active current and no hardware-configurable 50/60Hz notch. | Requires external digital filtering for line rejection; better suited for multi-sensor systems needing programmable gain. | Select when PGA, burn-out detection, or multiple excitation currents are required - not for fixed-gain, ultra-low-power, hardware-tuned rejection. |
| LTC2411IMS#PBF | 24-bit, pin-compatible with LTC2431 but lacks internal oscillator and requires external clock; 1ppm INL vs 3ppm, higher 300µA supply current. | Demands external crystal or oscillator; offers superior linearity but sacrifices micropower autonomy and ease of layout. | Select when ultimate INL (<1ppm) is mandatory and external timing infrastructure already exists - not for self-contained, low-component-count designs. |
Compared with ADS124S08IPWR and LTC2411IMS#PBF, the LTC2431CMS#PBF uniquely combines 20-bit precision, hardware-selectable 50/60Hz rejection, and 4µA autosleep - making it optimal for cost-sensitive, battery-operated, or space-constrained instrumentation where external timing components must be avoided.
Availability
LTC2431CMS#PBF is available at Aetrix Electronics and suitable for industrial process control, precision weigh scales, and portable data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LTC2431CMS#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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2431CMS#PBF belongs to Linear Technology's precision delta-sigma ADC family, designed specifically for low-power, high-accuracy sensor digitization in harsh environments where line-frequency interference and long-term drift are critical concerns.
FAQ
What is the operating temperature range for the LTC2431CMS#PBF?
The LTC2431CMS#PBF is specified for operation from –40°C to +85°C, matching the "I" grade designation in the LTC2430/LTC2431 family. All key parameters-including INL, noise, and CMRR-are guaranteed across this full industrial temperature range, with no derating required.
Does the LTC2431CMS#PBF require external passive components for its internal oscillator?
No, the LTC2431CMS#PBF requires no external passive components for oscillator operation. Its integrated oscillator is fully self-contained and supports hardware-selectable 50Hz or 60Hz notch filtering via the FO pin tied to VCC or GND - eliminating crystals, capacitors, or resistors from the timing path.
How does the LTC2431CMS#PBF achieve single-cycle settling with no latency?
The LTC2431CMS#PBF achieves single-cycle settling through a fixed-decimation FIR filter architecture that completes its response within one conversion period. Unlike sigma-delta converters requiring multiple cycles to settle, every 24-bit output from the LTC2431CMS#PBF corresponds exactly to the sampled input - enabling true real-time multiplexing without data invalidation windows.
Can the LTC2431CMS#PBF accept a 0.5V reference voltage?
Yes, the LTC2431CMS#PBF accepts differential reference voltages from 0.1V to VCC. With a 0.5V reference, the full-scale input range becomes ±0.25V, and the 0.56ppm RMS noise translates to ~0.28µVRMS - maintaining high effective resolution while improving INL performance due to reduced reference-related nonlinearity contributions.
What is the function of the seven GND pins on the LTC2431CMS#PBF SSOP package?
The seven GND pins on the LTC2431CMS#PBF serve distinct internal domains: analog ground, digital ground, reference ground, and power return paths. All must be connected to a low-impedance PCB ground plane to prevent coupling between domains - failure to connect any GND pin risks increased noise, reduced CMRR, and violation of absolute maximum ratings on analog inputs.
LTC2431CMS#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2431CMS#PBF FAQ
1.How can I place an order for LTC2431CMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2431CMS#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 LTC2431CMS#PBF reliable?
The price and inventory of LTC2431CMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2431CMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC2431CMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2431CMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2431CMS#PBF?
LTC2431CMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2431CMS#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 LTC2431CMS#PBF?
For technical support, including LTC2431CMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2431CMS#PBF requirements.
6.How does Aetrix verify that LTC2431CMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2431CMS#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 LTC2431CMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC2431CMS#PBF?
All LTC2431CMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2431CMS#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 LTC2431CMS#PBF part is unused and in its original packaging.
Return procedure for LTC2431CMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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