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Analog Devices Inc. LTC2473IDD#PBF
- Part No.:
- LTC2473IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2473IDD#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:121
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Product details
Overview
LTC2473IDD#PBF from Analog Devices (formerly Linear Technology) is a 16-bit differential ΔΣ analog-to-digital converter with integrated 1.25V precision reference, I²C interface, and selectable 208sps/833sps output rate. It operates from 2.7V to 5.5V, delivers ±1mV offset error and 0.01% gain error, and targets high-accuracy sensor signal digitization in industrial monitoring systems.
For engineers reviewing the LTC2473IDD#PBF datasheet, LTC2473IDD#PBF pinout, LTC2473IDD#PBF application, or LTC2473IDD#PBF equivalent, key selection criteria include its differential input range (±VREF), 2µA max sleep current, 10ppm/°C max reference drift over –40°C to +85°C, and compatibility with standard/fast-mode I²C buses up to 400kHz.
Technical Context
The LTC2473IDD#PBF implements a delta-sigma architecture with oversampling ratios of 8,192 (208sps) or 2,048 (833sps), enabling relaxed anti-aliasing filter requirements. Its proprietary input sampling scheme draws only 50nA average input current, minimizing loading on external sensor circuits.
It features single-cycle conversion settling, auto-power-down after conversion, and user-configurable sleep mode that powers down both ADC and reference-reducing supply current to ≤2µA. The internal oscillator eliminates external timing components, and the 1.25V reference exhibits ≤2ppm/°C drift (I-grade) and 0.1% initial accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit-supports 65,536 distinct digital codes for high-fidelity sensor digitization. |
| Input Type | Differential (±VREF)-rejects common-mode noise and enables bipolar measurement of transducer outputs. |
| Output Rate | Selectable 208sps or 833sps-trade-off between noise performance and throughput; 208sps yields lower transition noise (3µVRMS). |
| Reference Accuracy | 1.247V to 1.253V (±0.24%); ≤5ppm/°C drift (I-grade)-ensures stable full-scale calibration across industrial temperature range. |
| Supply Current | 3.5mA typ during conversion; ≤2µA max in sleep mode-enables battery-powered or energy-constrained monitoring nodes. |
| I²C Interface | Standard/fast-mode compatible (≤400kHz); 7-bit address with A0 pin selection-integrates seamlessly into existing microcontroller-based sensor hubs. |
| Offset Error | ±1mV max-limits zero-scale uncertainty to <0.08% of 1.25V full scale, critical for low-level thermocouple or strain gauge signals. |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed thermal pad (Pin 13 = GND). RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (1) | Reference output | Nominally 1.25V; sets ADC full-scale range; requires 0.1µF bypass to GND for stability and low noise. |
| COMP (2) | Reference compensation | Connects to 0.1µF capacitor to GND; controls reference startup time and transition noise. |
| 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 return | Multiple ground pins-including exposed pad-minimize ground impedance and improve PSRR/noise immunity. |
| SCL (5) | I²C clock input | Accepts external clock up to 400kHz; synchronous data transfer timing reference for SDA. |
| SDA (6) | I²C bidirectional data | Open-drain output during read; requires external pull-up; transmits 16-bit result MSB-first on SCL falling edges. |
| REF– (8) | Reference negative input | Defines zero-input level; tie directly to system ground or sensor ground sense point. |
| IN+ (9) | Differential positive input | Accepts voltage up to VREF; used with IN– for true differential measurement of bridge or amplifier outputs. |
| IN– (10) | Differential negative input | Accepts voltage down to 0V; complements IN+ for rejecting common-mode interference. |
| VCC (12) | Supply voltage | 2.7V–5.5V operation; requires local 10µF + 0.1µF bypassing for clean power delivery to analog core. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Single-cycle operation with no filter settling delay-enables deterministic timing in multiplexed sensor arrays. |
| Ultra-low input current | 50nA average sampling current-permits direct connection to high-impedance sensors (e.g., RTDs, thermistors) without buffer amplifiers. |
| Integrated reference | 1.25V ±0.1% initial accuracy, ≤5ppm/°C drift (I-grade)-eliminates external reference IC and associated layout complexity. |
| Configurable power modes | Auto-NAP (ADC off, ref on) and user-enabled SLEEP (ADC + ref off, ≤2µA)-extends battery life in portable instrumentation. |
| Internal oscillator | Eliminates external crystal/clock source-reduces BOM count and PCB area while ensuring consistent timing across temperature. |
Applications
| Industrial Process Monitoring | Environmental Sensor Nodes |
|---|---|
Use Scenario: Continuous digitization of 4–20mA loop outputs, pressure transducers, or load cells in factory automation cabinets. IC Role / Device Role / Timing Role: Differential ADC front-end converting analog process signals to calibrated 16-bit digital values via I²C for PLC or gateway MCU ingestion. Use Value: ±1mV offset and 0.01% gain error ensure <0.1% total unadjusted error over temperature-meeting SIL-2 functional safety signal chain requirements. | Use Scenario: Battery-powered air quality or soil moisture stations logging temperature, humidity, and gas concentration over weeks. IC Role / Device Role / Timing Role: Low-power sensor hub ADC acquiring differential outputs from electrochemical or capacitive sensors at 208sps. Use Value: 2µA sleep current and auto-shutdown reduce average system power to <10µA-enabling >1-year operation on a single CR2032 cell. |
| Direct Temperature Measurement | Embedded ADC Upgrade |
Use Scenario: Precision cold-junction compensation using thermocouples in HVAC controllers or test equipment. IC Role / Device Role / Timing Role: High-accuracy differential ADC measuring µV-level thermocouple EMF against a stable 1.25V reference. Use Value: 3µVRMS transition noise and 10ppm/°C reference drift minimize temperature measurement uncertainty to ±0.1°C over –40°C to +85°C. | Use Scenario: Retrofitting legacy 12-bit ADC modules (e.g., ADS7822) with higher resolution in medical patient monitors or power metering. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement offering 16-bit resolution, integrated reference, and I²C interface instead of SPI. Use Value: Eliminates external reference and level-shifting circuitry while delivering 4× finer quantization-improving diagnostic waveform fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1115IDGSR | 16-bit, 860sps, VREF not integrated (requires external reference or uses VCC); 0.5% gain error; 150nA input bias current. | Higher gain error and no internal reference increase calibration burden; better suited for cost-sensitive consumer IoT than precision industrial use. | Choose ADS1115IDGSR only if external reference is already present and ±0.5% system accuracy suffices. |
| MCP3424-E/SL | 18-bit, 15sps/3.75sps/1.875sps, integrated 2.048V reference (±2ppm/°C), I²C interface, but no selectable output rate or sleep mode. | Slower throughput limits dynamic signal capture; superior resolution benefits static measurements like weight scales, not real-time monitoring. | Prefer MCP3424-E/SL when ultra-high resolution at low speed is prioritized over power efficiency and flexible update rates. |
Compared with ADS1115IDGSR and MCP3424-E/SL, the LTC2473IDD#PBF uniquely balances 16-bit precision, selectable 208/833sps rates, integrated low-drift reference, and sub-2µA sleep current-making it optimal for battery-powered industrial sensors requiring both accuracy and responsiveness.
Availability
LTC2473IDD#PBF is available at Aetrix Electronics and suitable for industrial process control, environmental monitoring, and embedded instrumentation requiring stable component supply across extended temperature ranges.
Supply support for LTC2473IDD#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 LTC2473IDD#PBF belongs to ADI's precision delta-sigma ADC product line, engineered for low-power, high-accuracy sensor interfacing in harsh environments where reference stability and input integrity are critical.
FAQ
What is the operating temperature range of the LTC2473IDD#PBF?
The LTC2473IDD#PBF is rated for –40°C to +85°C (I-grade), validated across this full range for parameters including offset error (±2.5mV), gain error (±0.25% FS), and reference drift (≤5ppm/°C). This makes it suitable for deployment in uncontrolled industrial enclosures and outdoor environmental housings without derating.
Does the LTC2473IDD#PBF require an external crystal or clock source?
No, the LTC2473IDD#PBF includes a fully integrated oscillator and requires no external timing components. This simplifies layout, reduces BOM cost, and ensures consistent conversion timing across voltage and temperature-critical for deterministic sensor polling in real-time systems using the LTC2473IDD#PBF.
How does the LTC2473IDD#PBF achieve ultra-low input current?
The LTC2473IDD#PBF employs a proprietary input sampling architecture that reduces average input current to 50nA-several orders of magnitude lower than conventional delta-sigma converters. This allows direct connection to high-impedance sources like thermistors or bridge sensors without buffer amplifiers, preserving signal integrity in the LTC2473IDD#PBF signal chain.
Can the LTC2473IDD#PBF operate from a 3.3V supply?
Yes, the LTC2473IDD#PBF supports supply voltages from 2.7V to 5.5V, including standard 3.3V rails. At 3.3V, it maintains full 16-bit performance, 3.5mA typical conversion current, and retains all specifications-including reference output stability (1.247V–1.253V) and I²C compatibility-ensuring reliable operation in mixed-voltage embedded systems using the LTC2473IDD#PBF.
What is the purpose of the COMP pin on the LTC2473IDD#PBF?
Pin 2 (COMP) is the internal reference compensation terminal. It must be connected to a 0.1µF capacitor to GND to stabilize the integrated 1.25V reference and minimize transition noise. Reducing this capacitance shortens reference startup time (e.g., to ~1ms with 100pF) but increases RMS noise-requiring trade-off analysis per application when configuring the LTC2473IDD#PBF.
LTC2473IDD#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:
- Differential
- 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:
- -
LTC2473IDD#PBF FAQ
1.How can I place an order for LTC2473IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2473IDD#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 LTC2473IDD#PBF reliable?
The price and inventory of LTC2473IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2473IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2473IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2473IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2473IDD#PBF?
LTC2473IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2473IDD#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 LTC2473IDD#PBF?
For technical support, including LTC2473IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2473IDD#PBF requirements.
6.How does Aetrix verify that LTC2473IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2473IDD#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 LTC2473IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2473IDD#PBF?
All LTC2473IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2473IDD#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 LTC2473IDD#PBF part is unused and in its original packaging.
Return procedure for LTC2473IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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