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Analog Devices Inc. LTC2461IMS#PBF
- Part No.:
- LTC2461IMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2461IMS#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:235
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Product details
Overview
LTC2461IMS#PBF from Analog Devices (formerly Linear Technology) is a 16-bit single-ended delta-sigma ADC with integrated 1.25V precision reference, I²C interface, and MSOP-12 package. It operates from 2.7V to 5.5V, delivers 60 conversions per second, features 2 LSB typical offset error and 0.01% typical gain error, and targets low-power sensor monitoring in space-constrained industrial systems.
For engineers reviewing the LTC2461IMS#PBF datasheet, LTC2461IMS#PBF pinout, LTC2461IMS#PBF application, or LTC2461IMS#PBF equivalent, key selection criteria include its guaranteed no-missing-codes performance, 200nA sleep current, ±2 ppm/°C reference drift (I-grade), and compatibility with multiplexed analog inputs requiring zero-latency data output.
Technical Context
The LTC2461IMS#PBF implements a proprietary delta-sigma architecture with continuous internal offset and full-scale calibration, eliminating user intervention while maintaining accuracy across –40°C to +85°C. Its integrated oscillator enables standalone operation without external timing components.
It uses a single 2.7V–5.5V supply, supports two I²C addresses via A0 pin configuration (0010100 or 1010100), and provides true single-ended input range of 0V to 1.25V referenced to its internal 1.25V REFOUT. Conversion time is fixed at 13–23 ms, with no latency between conversion completion and data availability on SDA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit, no missing codes - guarantees monotonicity and full code coverage for precision measurement. |
| Reference Voltage | 1.25V ±3mV (1.247V–1.253V) - sets absolute full-scale input range and enables ratiometric-free operation. |
| Reference Drift | ±5 ppm/°C max (I-grade) - ensures <±0.5 LSB drift over full –40°C to +85°C operating range. |
| Conversion Rate | 60 conversions/second - supports real-time monitoring of slow-varying signals like temperature or pressure. |
| Supply Current | 1.5 mA active, 200 nA sleep - enables battery-powered deployments with multi-year runtime in duty-cycled systems. |
| Input Type | Single-ended (IN pin to GND) - simplifies signal conditioning for unipolar sensors such as RTDs, thermistors, or voltage outputs. |
| I²C Interface | Standard/Fast-mode (0–400 kHz), two slave addresses + global sync - allows multi-device coordination without bus arbitration complexity. |
Pinout & Package
Package: 12-lead plastic MSOP (3mm × 4.9mm), exposed pad not connected in MSOP variant; thermal resistance θJA = 135°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (1) | Reference output | Nominally 1.25V reference source; must be decoupled with ≤0.1µF capacitor to GND for stability and noise control. |
| COMP (2) | Reference compensation | Requires 0.1µF capacitor to GND; value must match or exceed REFOUT capacitor for proper reference regulation. |
| A0 (3) | I²C address select | Logic level sets device address: GND → 0010100, VCC → 1010100; enables dual-device addressing on same bus. |
| GND (4, 7, 11) | Ground return | Three dedicated ground pins minimize ground bounce and improve PSRR; connect directly to low-impedance ground plane. |
| SCL (5) | I²C clock input | Slave-only interface; accepts external clock up to 400 kHz; rising edge clocks data into device, falling edge clocks data out. |
| SDA (6) | I²C bidirectional data | Open-drain output requiring external pull-up; transmits 16-bit conversion result MSB-first after ACK. |
| REF– (8) | Reference negative input | Connects to system ground or sensor ground sense point; defines zero-input reference for ADC transfer function. |
| IN (9) | Analog input (single-ended) | Accepts 0V to 1.25V input relative to GND; high-impedance node with 50nA average sampling current enables direct RC filter interfacing. |
| GND (10) | Input ground reference | Dedicated ground return for IN pin; isolates analog input path from digital ground noise. |
| VCC (12) | Positive supply | 2.7V–5.5V operation; requires local bypass: 10µF bulk + 0.1µF ceramic capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 1.25V reference | Delivers ±0.1% initial accuracy and ±5 ppm/°C max drift (I-grade), eliminating need for external reference and reducing BOM count. |
| No-latency data output | Provides immediate access to completed conversion result-no settling delay or redundant reads required for multiplexed sensor arrays. |
| Ultra-low sleep current | 200nA shutdown mode (ADC + reference powered down) extends battery life in intermittent-read applications like environmental loggers. |
| Proprietary input sampling | Reduces average input current to 50nA-enables direct connection of RC anti-alias filters (e.g., 1kΩ + 0.1µF) with <1 LSB added error. |
| Continuous on-chip calibration | Performs automatic offset and full-scale correction every conversion cycle, ensuring long-term accuracy without firmware overhead or calibration routines. |
Applications
| Industrial Sensor Monitoring | Environmental Data Logging |
|---|---|
Use Scenario: Continuous reading of 4–20mA loop-powered temperature transmitters in factory automation panels. IC Role / Device Role / Timing Role: Single-ended ADC digitizing conditioned 0–1.25V output from current-to-voltage converter; synchronized via I²C global address for multi-channel coherence. Use Value: Eliminates external reference and calibration circuitry while maintaining ±0.01% FS accuracy across operating temperature, reducing board area by >30% vs discrete solutions. | Use Scenario: Battery-operated soil moisture and ambient temperature node deployed in agricultural IoT networks. IC Role / Device Role / Timing Role: Low-power ADC acquiring readings every 5 minutes; enters 200nA sleep mode between conversions to maximize battery lifetime. Use Value: Achieves >5-year runtime on a single CR2032 cell due to sub-µA quiescent current and no external biasing requirements. |
| Embedded System Health Monitoring | Legacy Analog Upgrades |
Use Scenario: Real-time voltage and current supervision in telecom power supplies with limited PCB space. IC Role / Device Role / Timing Role: Digitizing isolated sense signals using single-ended configuration; leverages built-in 1.25V reference for ratiometric immunity to supply variation. Use Value: Replaces dual-component (ADC + ref) designs with one IC, improving MTBF and easing layout of high-PSRR analog front-ends. | Use Scenario: Retrofitting aging 12-bit ADC modules in medical diagnostic equipment to meet updated IEC 60601 resolution requirements. IC Role / Device Role / Timing Role: Pin-compatible upgrade path (MSOP-12 footprint) delivering 16-bit resolution with identical I²C protocol and timing. Use Value: Enables compliance with new accuracy standards without redesigning PCB or firmware-only firmware read-depth extension needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 16-bit sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 4-channel differential input, programmable gain amplifier (PGA), 4.8V max VDD, no integrated reference - requires external 2.048V ref. | Supports differential sensing and variable gain; better suited for multi-sensor, wide-dynamic-range systems. | Select ADS1115IDGSR when channel count, PGA flexibility, or lower supply voltage (<2.7V) are critical; LTC2461IMS#PBF preferred for lowest power and reference integration. |
| MCP3424-E/ST | 4-channel, 18-bit resolution, 3.6V max VDD, internal 2.048V reference (±15 ppm/°C), I²C interface - higher resolution but larger MSOP-16 package. | Targets higher-accuracy metrology; lacks ultra-low sleep current (600nA min) and proprietary low-input-current sampling. | Choose MCP3424-E/ST for applications demanding >16-bit ENOB; LTC2461IMS#PBF remains optimal for space-constrained, battery-sensitive designs needing proven 16-bit no-missing-codes performance. |
Compared with ADS1115IDGSR and MCP3424-E/ST, the LTC2461IMS#PBF uniquely combines integrated 1.25V reference with 200nA sleep current and single-ended simplicity in a compact MSOP-12, making it the most efficient solution for cost- and size-sensitive unipolar sensor digitization.
Availability
LTC2461IMS#PBF is available at Aetrix Electronics and suitable for industrial sensor monitoring, environmental data logging, and embedded system health monitoring requiring stable component supply, long-lifecycle support, and guaranteed I-grade temperature performance.
Supply support for LTC2461IMS#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2461IMS#PBF belongs to ADI's legacy Linear Technology precision ADC portfolio, designed specifically for ultra-low-power, space-constrained measurement systems where integrated reference accuracy and minimal external components are essential.
FAQ
What is the operating temperature range for the LTC2461IMS#PBF?
The LTC2461IMS#PBF is rated for –40°C to +85°C (I-grade), validated across this full range for all key specifications including reference drift (±5 ppm/°C max), offset error (2 LSB typ), and supply current (1.5 mA typ). This makes LTC2461IMS#PBF suitable for deployment in harsh industrial environments without derating.
Does the LTC2461IMS#PBF require an external crystal or oscillator?
No, the LTC2461IMS#PBF includes a fully integrated oscillator and requires no external timing components. This eliminates BOM cost, board space, and layout sensitivity associated with crystal loading and EMI filtering-confirmed in the datasheet's "Internal Oscillator-No External Components Required" feature list and functional block diagram.
How does the LTC2461IMS#PBF handle input overrange and underrange conditions?
The LTC2461IMS#PBF clamps output codes at 0 (all zeros) for inputs below 0V and at 65535 (all ones) for inputs above 1.25V. Per datasheet Figure 3 and Applications Information section, this behavior is deterministic and repeatable, enabling robust fault detection in sensor interfaces without additional comparator circuitry.
Can the reference of the LTC2461IMS#PBF be disabled to reduce power consumption?
Yes, the LTC2461IMS#PBF supports reference shutdown via the SLP bit in its I²C configuration register. When SLP = 1, both ADC and reference power down after conversion, reducing total supply current to 200nA. Reference reactivation requires ~12ms startup time before next valid conversion, as specified in the Applications Information section.
Is the LTC2461IMS#PBF pin-compatible with the LTC2463IMS#PBF?
Yes, the LTC2461IMS#PBF and LTC2463IMS#PBF share identical MSOP-12 pinouts and software interface, differing only in input configuration: LTC2461IMS#PBF uses single-ended IN/GND, while LTC2463IMS#PBF uses differential IN+/IN–. This allows hardware reuse across both variants with only minor schematic and firmware adjustments.
LTC2461IMS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-TSSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 60
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- I2C
- Configuration:
- ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- Selectable Address
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2461IMS#PBF FAQ
1.How can I place an order for LTC2461IMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2461IMS#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 LTC2461IMS#PBF reliable?
The price and inventory of LTC2461IMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2461IMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC2461IMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2461IMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2461IMS#PBF?
LTC2461IMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2461IMS#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 LTC2461IMS#PBF?
For technical support, including LTC2461IMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2461IMS#PBF requirements.
6.How does Aetrix verify that LTC2461IMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2461IMS#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 LTC2461IMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC2461IMS#PBF?
All LTC2461IMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2461IMS#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 LTC2461IMS#PBF part is unused and in its original packaging.
Return procedure for LTC2461IMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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