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Analog Devices Inc. LTC2471CDD#PBF
- Part No.:
- LTC2471CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2471CDD#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:241
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Product details
Overview
LTC2471CDD#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 LTC2471CDD#PBF datasheet, LTC2471CDD#PBF pinout, LTC2471CDD#PBF application, or LTC2471CDD#PBF equivalent, key selection criteria include its 200nA sleep current, 3.5mA typical conversion supply current, single-cycle settling behavior for multiplexed inputs, and DFN-12 (3mm × 3mm) package with exposed thermal pad.
Technical Context
The LTC2471CDD#PBF implements a proprietary input sampling architecture 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 its auto-shutdown logic powers down the ADC after each conversion unless configured for continuous mode.
It supports two I²C slave addresses (0010100b or 1010100b) via the A0 pin, uses open-drain SDA with external pull-up, and outputs 16-bit binary data with no latency or filter settling delay. The integrated reference exhibits ±2ppm/°C max drift over 0°C to 70°C and maintains 1.247V–1.253V output across supply and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit-provides 65,536 discrete output codes for high-fidelity analog sensing. |
| Input Configuration | Single-ended (IN to GND)-simplifies connection to ground-referenced sensors like RTDs or voltage outputs. |
| Reference Voltage | 1.25V ±0.003V (0°C to 70°C)-sets full-scale input range and enables ratiometric measurement stability. |
| Offset Error | ±1 mV max-limits zero-scale error to <0.08% of full scale at 1.25V reference. |
| Gain Error | ±0.01% of FS-ensures end-point accuracy critical for calibrated instrumentation. |
| Supply Current | 3.5mA typ during conversion; 200nA max in sleep mode-supports battery-powered or energy-harvesting designs. |
| I²C Speed | Up to 400kHz-compatible with standard/fast-mode microcontrollers without clock stretching. |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 13), rated for 0°C to 70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (1) | Reference output | Nominally 1.25V precision voltage source; must be bypassed with ≤0.1µF capacitor to GND for stability. |
| COMP (2) | Reference compensation | Requires 0.1µF capacitor to GND; sets reference loop stability and noise performance. |
| A0 (3) | I²C address select | Configures slave address: GND → 0010100b; VCC → 1010100b-enables dual-device bus sharing. |
| GND (4,7,11,13) | Ground return | Multiple GND pins including exposed pad ensure low-impedance return path for analog/digital/reference domains. |
| SCL (5) | I²C clock input | Accepts external master clock up to 400kHz; device acts only as slave with no clock generation. |
| SDA (6) | I²C bidirectional data | Open-drain output requiring external pull-up; transmits 16-bit result MSB-first on falling SCL edges. |
| REF– (8) | Reference ground reference | Connects to system ground or sensor ground sense point; defines zero-input level for ADC transfer function. |
| IN (9) | Analog input | Single-ended input node (LTC2471-specific); accepts 0V to VREF (0–1.25V) with no external bias required. |
| GND (10) | Input ground reference | Dedicated GND for IN pin-minimizes ground bounce and improves PSRR in noisy environments. |
| VCC (12) | Power supply | 2.7V–5.5V operation; requires local 10µF + 0.1µF parallel bypassing for clean reference and conversion performance. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion output | One-to-one correspondence between completed conversion and I²C data-eliminates multiplexing delays and simplifies firmware. |
| Ultra-low input sampling current | 50nA average-permits direct use of simple RC anti-alias filters (e.g., 1kΩ + 0.1µF) with <1 LSB added error. |
| Auto power-down modes | ADC-only nap (800µA typ) or full sleep (200nA max) with programmable SLP bit-reduces average power in duty-cycled systems. |
| Integrated reference with low drift | ±2ppm/°C max tempco over 0°C–70°C-enables stable measurements without external reference calibration. |
| Internal oscillator | No external crystal or RC network required-reduces BOM count and layout complexity while ensuring consistent oversampling ratio. |
Applications
| Environmental Sensor Node | Industrial Process Monitor |
|---|---|
|
Use Scenario: Battery-powered wireless temperature/humidity node logging data every 10 seconds. IC Role / Device Role / Timing Role: Single-ended ADC digitizing analog outputs from thermistor and humidity ICs; provides stable 1.25V reference for ratiometric accuracy. Use Value: 200nA sleep current extends 2xAA battery life beyond 5 years; no external reference or clock saves PCB area and cost. |
Use Scenario: DIN-rail mounted PLC module measuring 4–20mA loop signals via precision shunt resistor. IC Role / Device Role / Timing Role: High-accuracy front-end ADC converting shunt voltage with minimal offset/gain drift over temperature. Use Value: ±1mV offset and ±0.01% gain error enable <0.1% total measurement uncertainty without factory calibration. |
| Embedded System Health Monitor | Portable Instrumentation Upgrade |
|
Use Scenario: On-board voltage/current/temperature monitoring in medical handheld device with strict power budget. IC Role / Device Role / Timing Role: Low-power ADC acquiring multiple rail voltages and thermal diode outputs via multiplexed inputs. Use Value: Single-cycle settling and no latency allow deterministic sampling of 4 channels at 208sps without firmware overhead. |
Use Scenario: Retrofitting legacy analog panel meters with digital readout using existing sensor wiring. IC Role / Device Role / Timing Role: Drop-in ADC replacement providing I²C output compatible with modern microcontroller interfaces. Use Value: Pin-compatible with LTC2471CMS#PBF and software-compatible with LTC2473 variants-enables flexible design reuse. |
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 input mux, no integrated reference, 2mV offset, 0.15% gain error, 150µA sleep current | Requires external reference and anti-alias filtering; better suited for multi-sensor polling than single high-accuracy channel | Select when multi-channel scanning is needed and reference accuracy can be managed externally |
| LTC2473CDD#PBF | Differential input, same package/interface, identical reference specs, ±2.5mV offset (vs ±1mV) | Supports bridge sensors and isolated signal conditioning where common-mode rejection is required | Select when measuring differential sources like load cells or isolated current shunts |
Compared with ADS1115IDGSR and LTC2473CDD#PBF, the LTC2471CDD#PBF offers superior offset accuracy and lowest sleep current for single-ended, reference-critical applications-making it optimal for long-life, high-precision sensor nodes where board space and calibration effort must be minimized.
Availability
LTC2471CDD#PBF is available at Aetrix Electronics and suitable for industrial process control, environmental monitoring, and embedded system health monitoring requiring stable component supply and guaranteed long-term availability.
Supply support for LTC2471CDD#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2471CDD#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy sensor digitization in space- and energy-constrained applications where integrated reference stability and simplified interface are essential.
FAQ
What is the operating temperature range for the LTC2471CDD#PBF?
The LTC2471CDD#PBF is specified for 0°C to 70°C ambient operation. This C-grade temperature range is validated per the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet. The device's reference drift is guaranteed at ±2ppm/°C across this full range, and all key parameters-including offset error, gain error, and supply current-are tested and characterized within these limits. Operation outside this range may result in unvalidated performance or reliability risk.
Does the LTC2471CDD#PBF require an external clock source?
No, the LTC2471CDD#PBF does not require an external clock source. It integrates a precision internal oscillator that drives the delta-sigma modulator and digital filter, enabling fully autonomous operation. This eliminates the need for crystals, resonators, or external RC networks-reducing bill-of-materials cost and PCB layout complexity. The I²C interface remains synchronous to the host controller's SCL signal, but the ADC's core conversion timing is self-contained.
How does the sleep mode function in the LTC2471CDD#PBF?
In sleep mode, the LTC2471CDD#PBF powers down both the ADC core and the integrated 1.25V reference, reducing supply current to ≤200nA. This state is entered by setting the SLP bit high during the DATA INPUT/OUTPUT phase. Upon a valid I²C address acknowledge, the reference restarts (12ms typical with 0.1µF capacitors), followed by ADC reactivation and a new conversion. Sleep mode is ideal for ultra-low-duty-cycle sensor polling where power savings outweigh startup latency.
Can the LTC2471CDD#PBF interface directly with a thermistor without external amplification?
Yes-the LTC2471CDD#PBF can interface directly with a thermistor configured in a voltage-divider topology referenced to its internal 1.25V REFOUT. With a 0–1.25V input range, typical NTC thermistors (e.g., 10kΩ at 25°C) yield ~0.2V–1.0V across the operating range, fitting well within the ADC's linear span. Its 50nA input sampling current minimizes self-heating error, and the absence of latency allows immediate digitization after multiplexer settling-no additional op-amp buffering is required.
What is the maximum I²C clock frequency supported by the LTC2471CDD#PBF?
The LTC2471CDD#PBF supports I²C fast-mode operation up to 400kHz, as confirmed in the I²C Timing Characteristics table. All timing parameters-including tLOW, tHIGH, tSU(DAT), and tHD(DAT)-are specified and guaranteed across the full 0°C to 70°C temperature range and 2.7V–5.5V supply. This allows seamless integration with modern microcontrollers and FPGAs without requiring clock stretching or custom timing adjustments.
LTC2471CDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- 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-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2471CDD#PBF FAQ
1.How can I place an order for LTC2471CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2471CDD#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 LTC2471CDD#PBF reliable?
The price and inventory of LTC2471CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2471CDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2471CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2471CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2471CDD#PBF?
LTC2471CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2471CDD#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 LTC2471CDD#PBF?
For technical support, including LTC2471CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2471CDD#PBF requirements.
6.How does Aetrix verify that LTC2471CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2471CDD#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 LTC2471CDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2471CDD#PBF?
All LTC2471CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2471CDD#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 LTC2471CDD#PBF part is unused and in its original packaging.
Return procedure for LTC2471CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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