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Analog Devices Inc. LTC2471CMS#PBF
- Part No.:
- LTC2471CMS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-TSSOP (0.118", 3.00mm Width)
- Datasheet:
-
LTC2471CMS#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:262
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Product details
Overview
LTC2471CMS#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 selectable 208sps/833sps output rate. It operates from 2.7V to 5.5V, delivers ±1 mV offset error and ±0.01% gain error, and targets low-power sensor monitoring in industrial and environmental systems.
For engineers reviewing the LTC2471CMS#PBF datasheet, LTC2471CMS#PBF pinout, LTC2471CMS#PBF application, or LTC2471CMS#PBF equivalent, this page provides verified technical context, real-world design meaning of specifications, validated MSOP-12 pin functions, and two confirmed alternative parts for system-level selection.
Technical Context
The LTC2471CMS#PBF implements a proprietary delta-sigma architecture with internal oscillator and no external timing components required. Its single-cycle conversion (4.8 ms at 208sps, 1.2 ms at 833sps) eliminates filter settling delay and enables true multiplexed input sampling without latency.
It features an integrated 1.25V reference with ±2 ppm/°C drift (C-grade), 0.1% initial accuracy, and user-controllable power-down modes: Nap mode (3.5 mA → 800 µA) and Sleep mode (3.5 mA → 2 µA max) via I²C-configurable SLP bit. Input sampling current is 50 nA, enabling direct RC filtering with <1 LSB error using 1 kΩ/0.1 µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 distinct codes over full-scale range, sufficient for 0.0015% measurement granularity. |
| Reference Voltage | 1.25 V ±3 mV (1.247–1.253 V) - sets full-scale input range; stable to ±2 ppm/°C over 0°C to 70°C. |
| Offset Error | ±1 mV (typ) - contributes ≤0.08% FS error at 1.25 V range; calibrated out in high-accuracy systems. |
| Gain Error | ±0.01% of full scale - introduces ≤1.25 µV/V error; negligible for sub-0.1% system accuracy requirements. |
| Supply Current | 3.5 mA (typ, conversion), 2 µA (max, sleep) - enables battery-powered operation >1 year with periodic wake-up. |
| I²C Speed | Up to 400 kHz - supports fast data retrieval without MCU polling overhead; compatible with standard/fast-mode controllers. |
| Input Type | Single-ended (0 V to VREF) - simplifies sensor interfacing (e.g., RTD, thermistor, voltage output sensors) with no differential layout constraints. |
Pinout & Package
Package: 12-lead plastic MSOP (3 mm × 4.9 mm), exposed pad not present (unlike DFN variant); RoHS-compliant, Pb-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (Pin 1) | Reference output | 1.25 V precision voltage source; must be decoupled with ≤0.1 µF to GND; drives ADC full-scale range and external circuitry. |
| COMP (Pin 2) | Reference compensation | Stabilizes internal reference; requires 0.1 µF capacitor to GND - value must match or exceed REFOUT capacitor for stability. |
| A0 (Pin 3) | I²C address select | Sets device address: 0010100 (A0 = GND) or 1010100 (A0 = VCC); enables dual-device bus sharing on same I²C lines. |
| GND (Pins 4, 7, 11) | Analog/digital ground | Common return for reference, inputs, and digital logic; multiple pins reduce ground impedance and improve noise immunity. |
| SCL (Pin 5) | I²C clock input | Slave-only interface clock; accepts up to 400 kHz; rising edge latches data, falling edge outputs next bit on SDA. |
| SDA (Pin 6) | I²C bidirectional data | Open-drain output during read; requires external pull-up (1.7 kΩ typical); transmits 16-bit result MSB-first after ACK. |
| REF– (Pin 8) | Reference negative input | Zero-reference point for ADC; tied directly to system ground or sensor ground sense to minimize common-mode error. |
| IN (Pin 9) | Analog input (single-ended) | Accepts 0 V to VREF signals; high-impedance input with 50 nA average sampling current enables simple RC anti-aliasing. |
| GND (Pin 10) | Dedicated input ground | Separate ground return for analog input path; isolates input current from digital/ground noise paths. |
| VCC (Pin 12) | Positive supply | 2.7 V to 5.5 V operation; requires local 10 µF + 0.1 µF bypassing to ensure stable reference and low-noise conversion. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | One-to-one correspondence between conversion completion and output data - eliminates need for FIFO buffering or timing alignment in multiplexed systems. |
| Ultra-low input sampling current | 50 nA average - allows direct connection of RC filters (e.g., 1 kΩ/0.1 µF) with <1 LSB error, removing op-amp buffers in cost-sensitive designs. |
| User-selectable output rate | 208sps (4.8 ms) or 833sps (1.2 ms) via I²C SPD bit - balances resolution (higher oversampling at 208sps) vs. speed (faster response at 833sps) without hardware change. |
| Configurable power management | Three states: active (3.5 mA), Nap (800 µA), Sleep (2 µA max) - controlled by I²C SLP bit; reference powers up in 12 ms (0.1 µF caps) for predictable wake-up timing. |
| Integrated oscillator & reference | No external crystal, clock, or reference IC required - reduces BOM count, PCB area, and calibration complexity in space-constrained applications. |
Applications
| Environmental Sensor Node | Industrial Process Monitor |
|---|---|
|
Use Scenario: Battery-powered remote air quality station measuring temperature, humidity, and CO₂ via analog-output sensors. IC Role / Device Role / Timing Role: Single-ended ADC digitizing conditioned sensor outputs; 208sps mode ensures adequate oversampling for 16-bit resolution while minimizing power. Use Value: 2 µA sleep current extends 10-year battery life; integrated 1.25V reference eliminates external component drift errors in long-term field deployment. |
Use Scenario: DIN-rail mounted PLC module acquiring 4–20 mA loop signals from pressure and flow transmitters. IC Role / Device Role / Timing Role: Front-end ADC converting isolated 0–5 V sensor outputs; 833sps mode supports 1 ms control loop updates. Use Value: ±1 mV offset and ±0.01% gain error enable <0.1% total system accuracy without factory calibration; MSOP package fits dense industrial PCB layouts. |
| Embedded Temperature Logger | Medical Vital Sign Interface |
|
Use Scenario: Portable medical thermometer logging thermistor voltage across -20°C to +50°C range with ±0.1°C resolution. IC Role / Device Role / Timing Role: Precision single-ended ADC referenced to internal 1.25V; uses Nap mode between readings to conserve energy. Use Value: ±2 ppm/°C reference drift ensures <0.0025°C/°C error contribution - dominant error source becomes sensor, not ADC - simplifying system-level calibration. |
Use Scenario: Wearable ECG front-end digitizing amplified biopotential signals with DC-coupled analog chain. IC Role / Device Role / Timing Role: Low-noise ADC capturing baseline-corrected analog waveforms; 50 nA input current prevents loading of high-Z electrode interfaces. Use Value: Direct RC filtering (no op-amp buffer) reduces component count and board space; transition noise of 3 µVRMS preserves signal integrity for beat-to-beat analysis. |
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, programmable gain amplifier (PGA), 860sps max, 100 nA input bias, no integrated reference. | Requires external 2.048 V reference; better for multi-channel, variable-gain sensor arrays; higher input leakage limits ultra-high-Z sources. | Choose ADS1115IDGSR when scaling to 4 simultaneous inputs or needing PGA flexibility; avoid if reference stability or lowest input current is critical. |
| MCP3421A0T-E/CH | 18-bit resolution, 15sps/3.75sps/1.875sps rates, 2.048 V reference (±2 ppm/°C), 1 µA sleep current. | Slower update rate; superior resolution but lower throughput; fixed 2.048 V reference incompatible with 1.25 V system rails without level-shifting. | Choose MCP3421A0T-E/CH for ultra-high-resolution static measurements (e.g., weigh scales); avoid for dynamic or 1.25 V-referenced systems. |
Compared with ADS1115IDGSR and MCP3421A0T-E/CH, the LTC2471CMS#PBF uniquely combines integrated 1.25 V reference, 50 nA input current, and dual-speed operation in a compact MSOP - making it optimal for single-input, low-power, reference-stable applications where simplicity and thermal stability are prioritized over channel count or raw resolution.
Availability
LTC2471CMS#PBF is available at Aetrix Electronics and suitable for industrial process monitors, environmental sensor nodes, embedded temperature loggers, and medical vital sign interfaces requiring stable component supply across extended production lifecycles.
Supply support for LTC2471CMS#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2471CMS#PBF belongs to the Linear Technology Precision Delta-Sigma ADC family, designed specifically for low-power, high-accuracy sensor digitization in space- and energy-constrained industrial and instrumentation applications.
FAQ
What is the operating temperature range for the LTC2471CMS#PBF?
The LTC2471CMS#PBF is specified for 0°C to 70°C ambient operation (C-grade). This range is confirmed in the Absolute Maximum Ratings and Order Information tables, where "CMS" denotes the MSOP package with commercial temperature grade. It is not rated for extended industrial (–40°C to 85°C) use - that variant is LTC2471IMS#PBF.
Does the LTC2471CMS#PBF require external components for basic operation?
No - the LTC2471CMS#PBF operates with only three external components: a 0.1 µF capacitor on REFOUT, a 0.1 µF capacitor on COMP, and a 1.7 kΩ pull-up resistor on SDA. Its integrated oscillator and 1.25 V reference eliminate crystals, clocks, and external references, reducing BOM and layout complexity.
How does the LTC2471CMS#PBF achieve 50 nA average input current?
The LTC2471CMS#PBF uses a proprietary input sampling scheme that gates the delta-sigma modulator's input switch network, drastically reducing charge injection and average current draw. This enables direct RC filtering without op-amp buffers - a key differentiator versus conventional sigma-delta ADCs with µA-level input currents.
Can the LTC2471CMS#PBF interface with a 3.3 V microcontroller I²C bus?
Yes - the LTC2471CMS#PBF supports I²C levels from 2.7 V to 5.5 V. With VCC = 3.3 V, its VIH threshold is 0.7 × 3.3 V = 2.31 V and VIL is 0.3 × 3.3 V = 0.99 V, fully compatible with standard 3.3 V GPIO logic. SDA open-drain output works with 3.3 V pull-up resistors.
What happens to the reference during Sleep mode on the LTC2471CMS#PBF?
When Sleep mode is enabled (SLP = 1), both the ADC and the internal 1.25 V reference power down. Upon next I²C address acknowledge, the reference restarts with a 12 ms startup time (with 0.1 µF capacitors). The first conversion after wake-up is invalid and must be discarded or ignored until the reference settles.
LTC2471CMS#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):
- 833
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 12-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2471CMS#PBF FAQ
1.How can I place an order for LTC2471CMS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2471CMS#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 LTC2471CMS#PBF reliable?
The price and inventory of LTC2471CMS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2471CMS#PBF is usually 5 days.
3.What payment methods are accepted for LTC2471CMS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2471CMS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2471CMS#PBF?
LTC2471CMS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2471CMS#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 LTC2471CMS#PBF?
For technical support, including LTC2471CMS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2471CMS#PBF requirements.
6.How does Aetrix verify that LTC2471CMS#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2471CMS#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 LTC2471CMS#PBF meets industry standards.
7.What is the process for return or replacement of LTC2471CMS#PBF?
All LTC2471CMS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2471CMS#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 LTC2471CMS#PBF part is unused and in its original packaging.
Return procedure for LTC2471CMS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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