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Analog Devices Inc. LTC2471IDD#PBF
- Part No.:
- LTC2471IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2471IDD#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:598
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Product details
Overview
LTC2471IDD#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 LTC2471IDD#PBF datasheet, LTC2471IDD#PBF pinout, LTC2471IDD#PBF application, or LTC2471IDD#PBF equivalent, key selection considerations include its 2µA max sleep current, 2ppm/°C reference drift (I-grade), single-cycle conversion settling, and compatibility with RC anti-aliasing filters due to 50nA average input sampling current.
Technical Context
The LTC2471IDD#PBF implements a proprietary delta-sigma architecture with internal oscillator, no external clock required, and oversampling ratios of 8,192 (208sps) or 2,048 (833sps). Its input sampling scheme reduces average input current to 50nA, enabling direct RC filter interfacing without buffer amplifiers.
It supports two power states: NAP (ADC powered down, reference active, ~800µA typical supply current) and SLEEP (both ADC and reference powered down, ≤2µA max). Reference startup time is 12ms with 0.1µF COMP and REFOUT capacitors, and the device enters DATA INPUT/OUTPUT state automatically after conversion completion for immediate I²C readout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - Provides 65,536 distinct digital codes for high-fidelity analog measurement. |
| Reference Voltage | 1.25V ±3mV (1.247V–1.253V) - Sets full-scale input range; enables 0V to 1.25V single-ended measurement on LTC2471. |
| Reference Drift | ±5 ppm/°C (I-grade) - Ensures <±0.5 LSB drift over –40°C to +85°C, critical for uncalibrated temperature-sensitive applications. |
| Offset Error | ±1 mV (typ) - Translates to <±0.8 LSB at 1.25V reference, minimizing zero-point calibration burden. |
| Gain Error | ±0.01% FS (typ) - Limits full-scale scaling error to <±6.6 LSB, supporting accurate absolute voltage sensing. |
| Supply Current | 3.5 mA (typ, conversion), ≤2 µA (max, sleep) - Enables battery-powered operation with duty-cycled measurements. |
| I²C Speed | Up to 400 kHz - Compatible with standard/fast-mode I²C controllers without timing margin concerns. |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 13 = GND). Thermal resistance θJA = 43°C/W. Requires low-impedance ground connection to exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (1) | Reference output | Nominally 1.25V; sets ADC full-scale range; must be decoupled with ≤0.1µF capacitor to GND. |
| COMP (2) | Reference compensation | Stabilizes internal reference; requires 0.1µF capacitor to GND; value must ≥ REFOUT capacitor. |
| A0 (3) | I²C address select | Configures slave address: 0010100 (A0=GND) or 1010100 (A0=VCC); enables dual-device bus sharing. |
| GND (4,7,11,13) | Ground reference | Multiple ground pins reduce noise coupling; exposed pad (13) must connect directly to PCB ground plane. |
| SCL (5) | I²C clock input | Slave-only interface; accepts external clock up to 400 kHz; rising edge clocks data into device. |
| SDA (6) | I²C bidirectional data | Open-drain output during data transfer; requires external pull-up; transmits 16-bit result MSB-first. |
| REF– (8) | Reference negative input | Defines zero-input level; tied to system ground or sensor ground sense point for common-mode rejection. |
| IN (9) | Analog input (single-ended) | Accepts 0V to VREF (0–1.25V) signals; overrange (>VREF) outputs 0xFFFF, underrange (<0V) outputs 0x0000. |
| GND (10) | Input ground return | Dedicated ground path for analog input; separates signal return from power/IO grounds to minimize noise. |
| VCC (12) | Positive supply | 2.7V–5.5V operation; requires 10µF + 0.1µF parallel bypassing at pin for stable conversion performance. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency output | One-to-one correspondence between conversion completion and I²C data availability-no filter settling delay or redundant reads needed in multiplexed systems. |
| Ultra-low input current | 50nA average sampling current enables direct RC low-pass filtering (e.g., 1kΩ + 0.1µF) with <1 LSB added error-eliminates need for input buffers. |
| Configurable power modes | Software-selectable SPD (208/833sps) and SLP (NAP/SLEEP) bits allow dynamic trade-off between speed, accuracy, and energy per conversion. |
| Integrated oscillator | Eliminates external clock components and associated layout complexity while maintaining precise oversampling ratio control. |
| Single-cycle settling | Conversion completes in fixed time (4.8ms or 1.2ms) with no latency-simplifies timing in time-triggered or event-driven acquisition systems. |
Applications
| Industrial Process Monitoring | Environmental Sensor Hub |
|---|---|
|
Use Scenario: Continuous monitoring of 4–20mA loop sensors, RTDs, or thermistors in PLC analog input modules. IC Role / Device Role / Timing Role: Single-ended ADC digitizing conditioned sensor outputs; provides stable reference and low-noise conversion at 208sps for slow-varying process variables. Use Value: Eliminates external reference and buffer ICs, reducing BOM count and board area while maintaining ±0.05% total measurement uncertainty over –40°C to +85°C. |
Use Scenario: Battery-powered air quality node measuring CO₂, humidity, and particulate matter via analog-output sensors. IC Role / Device Role / Timing Role: Low-power ADC acquiring sensor data at 833sps during active measurement bursts; enters 2µA sleep mode between readings. Use Value: Achieves >1-year battery life using coin cell by leveraging ultra-low sleep current and single-cycle conversion without wake-up latency. |
| Direct Temperature Measurement | Embedded ADC Upgrade |
|
Use Scenario: Precision thermistor-based temperature sensing in medical devices or HVAC controls where self-heating must be minimized. IC Role / Device Role / Timing Role: High-impedance-tolerant ADC sampling thermistor voltage divider; uses 50nA input current to avoid self-heating errors in high-value resistor networks. Use Value: Enables direct thermistor readout with <0.1°C resolution without op-amp buffering-reducing component count and thermal drift sources. |
Use Scenario: Retrofitting legacy 12-bit microcontroller ADCs in industrial equipment to meet higher accuracy requirements without redesigning signal chain. IC Role / Device Role / Timing Role: Drop-in I²C peripheral replacing MCU's internal ADC; provides calibrated 16-bit results with known offset/gain specs and temperature stability. Use Value: Delivers guaranteed 16-bit linearity and ±5ppm/°C reference drift-enabling compliance with IEC 61000-4-30 Class A power quality standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 16-bit, 860sps, internal 2.048V ref (±15ppm/°C), no integrated oscillator, requires external clock for max speed. | Higher reference drift limits use in wide-temperature uncalibrated systems; lacks auto-shutdown and ultra-low input current. | Choose ADS1115IDGSR when cost sensitivity outweighs reference stability and input drive requirements. |
| MCP3424-E/SL | 18-bit, 15sps/60sps/240sps, 2.048V ref (±15ppm/°C), no sleep mode below 1µA, I²C address fixed (no A0 pin). | Slower max rate and higher reference drift constrain dynamic or battery-critical applications; no software-configurable power-down. | Choose MCP3424-E/SL only for static, high-resolution measurements where 240sps suffices and temperature range is limited. |
Compared with ADS1115IDGSR and MCP3424-E/SL, the LTC2471IDD#PBF uniquely combines I-grade reference stability (±5ppm/°C), 50nA input current, and sub-2µA sleep current-making it optimal for uncalibrated, wide-temperature, battery-constrained sensing where measurement integrity must persist across environmental stress.
Availability
LTC2471IDD#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, environmental sensor hubs, and direct temperature measurement requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2471IDD#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 LTC2471IDD#PBF belongs to Linear's precision delta-sigma ADC family, designed specifically for space- and power-constrained instrumentation where integrated reference stability, low input current, and I²C simplicity eliminate external support components.
FAQ
What is the operating temperature range of the LTC2471IDD#PBF?
The LTC2471IDD#PBF is rated for –40°C to +85°C (I-grade). This extended range is validated across all key specifications including reference drift (±5 ppm/°C), offset error (±2.5 mV max), and supply current (≤2 µA sleep). The DFN package's exposed pad ensures reliable thermal performance under continuous operation within this envelope.
How does the LTC2471IDD#PBF achieve ultra-low input current?
The LTC2471IDD#PBF uses a proprietary input sampling architecture that reduces average input current to 50nA-several orders of magnitude lower than conventional delta-sigma ADCs. This allows direct connection of RC anti-aliasing filters (e.g., 1kΩ + 0.1µF) without buffer amplifiers, eliminating associated noise, power, and board space penalties while maintaining <1 LSB error.
Can the LTC2471IDD#PBF operate with a 3.3V supply?
Yes, the LTC2471IDD#PBF operates over 2.7V to 5.5V, fully supporting 3.3V systems. At 3.3V, reference output remains 1.25V ±3mV, I²C logic thresholds scale correctly (VIH = 0.7×VCC ≈ 2.31V), and supply current is 2.5mA (typ, conversion) - all specified and tested per datasheet conditions.
What is the purpose of the COMP pin on the LTC2471IDD#PBF?
The COMP pin (Pin 2) provides internal compensation for the integrated 1.25V reference. It must be connected to a 0.1µF capacitor to GND to ensure low-noise operation and stability. Critically, the COMP capacitor value must be ≥ the REFOUT capacitor value; violating this causes increased transition noise and potential reference instability.
Does the LTC2471IDD#PBF require an external crystal or clock source?
No, the LTC2471IDD#PBF includes a fully integrated oscillator and requires no external clock components. This simplifies layout, eliminates clock-related EMI, and guarantees precise oversampling ratios (8,192 at 208sps, 2,048 at 833sps) essential for relaxed anti-aliasing filter design and consistent noise shaping performance.
LTC2471IDD#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2471IDD#PBF FAQ
1.How can I place an order for LTC2471IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2471IDD#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 LTC2471IDD#PBF reliable?
The price and inventory of LTC2471IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2471IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2471IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2471IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2471IDD#PBF?
LTC2471IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2471IDD#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 LTC2471IDD#PBF?
For technical support, including LTC2471IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2471IDD#PBF requirements.
6.How does Aetrix verify that LTC2471IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2471IDD#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 LTC2471IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2471IDD#PBF?
All LTC2471IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2471IDD#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 LTC2471IDD#PBF part is unused and in its original packaging.
Return procedure for LTC2471IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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