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Analog Devices Inc. LTC2471IDD#TRPBF
- Part No.:
- LTC2471IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2471IDD#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,142
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Product details
Overview
LTC2471IDD#TRPBF 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, draws 3.5mA typical supply current in conversion mode and 2µA max in sleep mode, and targets low-power sensor monitoring and embedded data acquisition.
For engineers reviewing the LTC2471IDD#TRPBF datasheet, LTC2471IDD#TRPBF pinout, LTC2471IDD#TRPBF application, or LTC2471IDD#TRPBF equivalent, key selection criteria include its 2ppm/°C reference drift (I-grade), ±1mV offset error, 0.01% gain error, single-cycle settling behavior, and DFN-12 (3mm × 3mm) package with exposed thermal pad.
Technical Context
The LTC2471IDD#TRPBF implements a proprietary input sampling scheme that reduces average input current to 50nA-several orders of magnitude lower than conventional delta-sigma converters-enabling direct RC filter interfacing without significant error. Its internal oscillator eliminates external timing components, and it supports true single-conversion settling with no latency or filter delay.
It uses a 16-bit decimating sinc filter with oversampling ratios of 8,192 (at 208sps) or 2,048 (at 833sps), relaxing anti-aliasing requirements. The device transitions automatically between CONVERT, NAP (ADC off, reference on), and SLEEP (both ADC and reference off) states, achieving 200nA total shutdown current when both blocks are disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit-provides 65,536 discrete output codes for high-fidelity analog measurement. |
| Reference Voltage | 1.25V ±3mV (1.247V–1.253V)-sets full-scale input range; stable over temperature with ±5ppm/°C max drift (I-grade). |
| Offset Error | ±1mV-ensures accurate zero-scale alignment without calibration in most industrial sensing applications. |
| Gain Error | ±0.01% of FS-minimizes span deviation across input range, critical for calibrated transducer interfaces. |
| Supply Current | 3.5mA typ (conversion), 2µA max (sleep)-enables battery-powered operation with rapid wake-up and low quiescent power. |
| Output Rate | Selectable 208sps or 833sps-supports trade-off between noise performance (lower rate) and throughput (higher rate). |
| Input Type | Single-ended (0V to VREF)-simplifies connection to ground-referenced sensors like RTDs, thermistors, and voltage outputs. |
Pinout & Package
Package: 12-lead plastic DFN (3mm × 3mm) with exposed thermal pad (Pin 13), rated for –40°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (1) | Reference output | Nominally 1.25V reference source; must be bypassed with ≤0.1µF capacitor to GND; not externally driven. |
| COMP (2) | Reference compensation | Stabilizes internal reference; requires 0.1µF capacitor to GND; value must match or exceed REFOUT capacitor. |
| A0 (3) | I²C address select | Sets LSB of 7-bit I²C address: tied to GND → 0010100 (0x24), tied to VCC → 1010100 (0x54). |
| GND (4,7,11,13) | Ground return | Multiple ground pins-including exposed pad-require low-impedance PCB connection to minimize noise and thermal resistance. |
| SCL (5) | I²C clock input | Accepts external master clock up to 400kHz; only functions as slave clock input, not output. |
| SDA (6) | I²C bidirectional data | Open-drain output during data transfer; requires external pull-up resistor (typically 1.7kΩ to VCC). |
| REF– (8) | Reference ground reference | Sets zero-input point; must connect directly to system ground or sensor ground sense point. |
| IN (9) | Analog input (single-ended) | Accepts 0V to VREF input; designed for low-leakage, high-impedance sources due to 50nA avg. sampling current. |
| GND (10) | Input ground reference | Dedicated ground return for IN pin; improves PSRR and common-mode rejection in noisy environments. |
| VCC (12) | Positive supply | 2.7V–5.5V operation; requires local decoupling: 10µF bulk + 0.1µF ceramic in parallel, placed near pin. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Single-cycle operation delivers one valid 16-bit result per conversion with no filter settling delay-ideal for multiplexed sensor arrays. |
| Ultra-low input current | 50nA average sampling current enables direct RC filtering (e.g., 1kΩ/0.1µF) with <1LSB added error-eliminates need for buffer op-amps. |
| Integrated precision reference | 1.25V reference with ±5ppm/°C max drift (I-grade) and 0.1% initial accuracy-removes external reference component and layout complexity. |
| Configurable power states | Software-selectable Nap (ADC off) or Sleep (ADC + reference off) modes reduce current from 3.5mA to 2µA max-extends battery life in portable instruments. |
| Internal oscillator | Eliminates external crystal or clock source-reduces BOM count, board space, and startup time while maintaining timing accuracy. |
Applications
| Environmental Monitoring | Industrial Process Control |
|---|---|
Use Scenario: Measuring temperature, humidity, or gas concentration using resistive or voltage-output sensors in remote or battery-powered nodes. IC Role / Device Role / Timing Role: Single-ended ADC digitizing low-bandwidth analog signals with built-in reference and I²C output for microcontroller readout. Use Value: Enables long-life operation via 2µA sleep current and eliminates external reference calibration, reducing field maintenance. | Use Scenario: Monitoring pressure, flow, or level in PLC analog input modules or distributed I/O systems. IC Role / Device Role / Timing Role: Precision front-end ADC providing 16-bit resolution and ±1mV offset stability across –40°C to +85°C ambient range. Use Value: Delivers consistent measurement accuracy without recalibration across wide industrial temperature extremes. |
| Data Acquisition Systems | Embedded ADC Upgrades |
Use Scenario: Adding high-resolution analog inputs to compact test equipment or portable diagnostic tools. IC Role / Device Role / Timing Role: Standalone I²C ADC replacing multi-chip solutions (separate ADC + reference + oscillator) in space-constrained designs. Use Value: Reduces footprint by integrating reference, oscillator, and low-noise conversion in a 3mm × 3mm DFN package. | Use Scenario: Replacing legacy 12-bit or uncalibrated ADCs in existing products requiring higher resolution and lower power. IC Role / Device Role / Timing Role: Pin-compatible upgrade path (with minor firmware update) delivering 4× more codes and integrated reference stability. Use Value: Achieves measurable improvement in measurement fidelity without PCB redesign or layout rework. |
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 | 16-bit, 860sps max, internal 2.048V ref (±15ppm/°C), no integrated oscillator, requires external clock or crystal. | Higher gain options (up to 16x PGA), but larger offset drift and no auto-shutdown of reference. | Choose ADS1115IDGSR if programmable gain amplification is required; avoid if ultra-low drift or lowest sleep current is critical. |
| MCP3424-E/ST | 18-bit, 15sps/60sps/240sps, internal 2.048V ref (±15ppm/°C), no I²C address select pin, fixed conversion rates. | Higher resolution but slower max rate and less flexible power management-no sleep mode for reference. | Choose MCP3424-E/ST for ultra-high resolution at low speed; prefer LTC2471IDD#TRPBF for balanced speed/power/stability in industrial monitoring. |
Compared with ADS1115IDGSR and MCP3424-E/ST, the LTC2471IDD#TRPBF offers superior reference stability (±5ppm/°C vs ≥±15ppm/°C), lower sleep current (2µA vs ≥1µA with reference active), and true single-cycle settling-making it optimal for temperature-critical, battery-operated, or multiplexed sensor systems.
Availability
LTC2471IDD#TRPBF is available at Aetrix Electronics and suitable for environmental monitoring, industrial process control, and embedded data acquisition requiring stable component supply, extended temperature support (–40°C to +85°C), and long-term lifecycle continuity.
Supply support for LTC2471IDD#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, formed through the acquisition of Linear Technology in 2017.
The LTC2471 series belongs to ADI's precision delta-sigma ADC product line, engineered for low-power, high-accuracy measurement in space- and energy-constrained industrial and instrumentation systems.
FAQ
What is the operating temperature range of the LTC2471IDD#TRPBF?
The LTC2471IDD#TRPBF is specified for –40°C to +85°C operation (I-grade). This extended range ensures reliable performance in industrial environments, outdoor sensor nodes, and automotive under-hood applications where ambient temperatures fluctuate widely. The part maintains its 1.25V reference accuracy and 2ppm/°C drift specification across this full range, as confirmed in the Electrical Characteristics table and Absolute Maximum Ratings section of the datasheet.
Does the LTC2471IDD#TRPBF require an external crystal or clock source?
No, the LTC2471IDD#TRPBF does not require an external crystal or clock source. It integrates a precision internal oscillator that drives the delta-sigma modulator and digital filter-eliminating external timing components and reducing BOM cost and board area. This oscillator is factory-trimmed and supports both 208sps and 833sps output rates without external configuration, as detailed in the "Ease of Use" and "Block Diagram" sections of the datasheet.
How does the LTC2471IDD#TRPBF achieve ultra-low input current?
The LTC2471IDD#TRPBF achieves 50nA average input sampling current via a proprietary input sampling architecture that minimizes charge injection and duty cycling of the input switch network-unlike conventional delta-sigma ADCs. This allows direct interface with simple RC filters (e.g., 1kΩ + 0.1µF) without significant measurement error, as validated in the Applications Information section and Typical Performance Characteristics (Figure G06).
Can the LTC2471IDD#TRPBF operate from a 3.3V supply?
Yes, the LTC2471IDD#TRPBF operates fully across 2.7V to 5.5V, including standard 3.3V logic supplies. At 3.3V, it maintains all key specifications: 16-bit resolution, ±1mV offset error, 0.01% gain error, and 2µA max sleep current. The reference output remains stable at 1.25V (±3mV), and I²C timing complies with fast-mode (400kHz) requirements, as verified in the Electrical Characteristics tables for VCC = 2.7V, 4.1V, and 5.5V conditions.
What is the purpose of the COMP pin on the LTC2471IDD#TRPBF?
COMP (Pin 2) is the internal reference compensation pin. It must be connected to a 0.1µF capacitor to GND to stabilize the integrated 1.25V reference and minimize transition noise. Critically, the COMP capacitor value must be ≥ the REFOUT capacitor value-violating this causes instability and increased noise, as explicitly stated in the Pin Functions section and illustrated in Figure F04 (Transition Noise vs Capacitance).
LTC2471IDD#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2471IDD#TRPBF FAQ
1.How can I place an order for LTC2471IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2471IDD#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 LTC2471IDD#TRPBF reliable?
The price and inventory of LTC2471IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2471IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2471IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2471IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2471IDD#TRPBF?
LTC2471IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2471IDD#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 LTC2471IDD#TRPBF?
For technical support, including LTC2471IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2471IDD#TRPBF requirements.
6.How does Aetrix verify that LTC2471IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2471IDD#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 LTC2471IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2471IDD#TRPBF?
All LTC2471IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2471IDD#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 LTC2471IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC2471IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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