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Analog Devices Inc. LTC2473IDD#TRPBF
- Part No.:
- LTC2473IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2473IDD#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,372
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Product details
Overview
LTC2473IDD#TRPBF 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 ±1 mV offset error and ±0.01% gain error, and targets high-accuracy sensor digitization in industrial process control and environmental monitoring systems.
For engineers reviewing the LTC2473IDD#TRPBF datasheet, LTC2473IDD#TRPBF pinout, LTC2473IDD#TRPBF application, or LTC2473IDD#TRPBF equivalent, key selection criteria include its differential input range (±VREF), 2µA max sleep current, 2ppm/°C reference drift (I-grade), and single-cycle conversion settling-critical for multiplexed sensor arrays and battery-powered instrumentation.
Technical Context
The LTC2473IDD#TRPBF implements a delta-sigma architecture with internal oscillator and sinc³ decimation filter, achieving 16-bit resolution without external clocking. Its proprietary input sampling scheme limits average input current to 50nA, enabling direct RC filtering with minimal error.
It supports two conversion modes: Nap mode (ADC auto-shutdown, reference active, 800µA typ supply current) and Sleep mode (ADC + reference powered down, 2µA max supply current). Reference startup time is 12ms with 0.1µF COMP/REFOUT capacitors, and conversion time is 4.8ms (208sps) or 1.2ms (833sps).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit-provides 65,536 discrete codes for high-fidelity sensor signal digitization. |
| Input Type | Differential (±VREF)-rejects common-mode noise and enables bipolar measurement of transducer outputs. |
| 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 | ±1 mV-ensures accurate zero-point alignment without calibration in low-drift applications. |
| Gain Error | ±0.01% of FS-supports precise scaling of pressure, temperature, or strain signals without gain trimming. |
| Supply Current | 3.5mA typ (conversion), 2µA max (sleep)-enables ultra-low-power operation in energy-constrained IoT nodes. |
| I²C Interface | Standard/Fast mode (≤400kHz)-compatible with legacy and modern microcontrollers; no external pull-up voltage dependency beyond VCC. |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed pad (DD package); operating temperature range –40°C to +85°C (I-grade).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| REFOUT (Pin 1) | Reference output | Nominally 1.25V reference source; must be bypassed with ≤0.1µF capacitor to GND for stability and low noise. |
| COMP (Pin 2) | Reference compensation | Connects to 0.1µF capacitor to GND; sets reference loop stability and startup time (12ms typical). |
| A0 (Pin 3) | I²C address select | Configures slave address: 0010100 (A0 = GND) or 1010100 (A0 = VCC); enables dual-device bus sharing. |
| GND (Pins 4, 7, 11, Exposed Pad 13) | Ground reference | Multiple ground connections minimize ground bounce; exposed pad requires low-impedance PCB ground plane tie. |
| SCL (Pin 5) | I²C clock input | Accepts external clock up to 400kHz; device acts only as I²C slave-no clock generation capability. |
| SDA (Pin 6) | I²C bidirectional data | Open-drain output requiring external pull-up; outputs 16-bit conversion result MSB-first on falling SCL edges. |
| REF– (Pin 8) | Negative reference input | Sets ADC zero-input point; tied directly to system ground or sensor return for accurate differential referencing. |
| IN+ (Pin 9) | Differential positive input | Accepts input voltage up to VREF; designed for direct connection to bridge sensors or instrumentation amplifiers. |
| IN– (Pin 10) | Differential negative input | Accepts input voltage down to 0V; paired with IN+ for true differential measurement with common-mode rejection. |
| VCC (Pin 12) | Power supply | 2.7V–5.5V operation; requires local 10µF + 0.1µF parallel bypassing for low-noise ADC performance. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency conversion | Single-cycle operation with deterministic 4.8ms/1.2ms conversion time-eliminates filter settling delays in multiplexed sensor systems. |
| Ultra-low input current | 50nA average sampling current-permits use of simple RC anti-aliasing filters (e.g., 1kΩ + 0.1µF) with <1 LSB error impact. |
| Integrated precision reference | 1.25V ±0.1% initial accuracy, ±5ppm/°C max drift (I-grade)-removes need for external reference and associated layout complexity. |
| Configurable power states | Three operational modes: Conversion (3.5mA), Nap (800µA), Sleep (2µA max)-enables adaptive power management per measurement duty cycle. |
| Internal oscillator | No external clock required-reduces BOM count and eliminates clock routing noise coupling into analog section. |
Applications
| Industrial Process Control | Environmental Monitoring |
|---|---|
|
Use Scenario: Digitizing 4–20mA loop outputs from pressure and flow transmitters in PLC analog input modules. IC Role / Device Role / Timing Role: Differential ADC with integrated reference converts ratiometric sensor outputs while rejecting common-mode noise from long cable runs. Use Value: Eliminates external reference and calibration components; ±1mV offset ensures <0.1%FS accuracy across –40°C to +85°C operating range. |
Use Scenario: Battery-powered air quality sensor node measuring PM2.5, CO₂, and humidity via analog-output electrochemical sensors. IC Role / Device Role / Timing Role: Low-power ADC with 2µA sleep current samples sensors intermittently, extending coin-cell life to >5 years. Use Value: Integrated reference and no-latency conversion enable rapid wake-and-measure cycles without reference stabilization delay. |
| Direct Temperature Measurements | Embedded ADC Upgrades |
|
Use Scenario: High-accuracy thermistor or RTD front-end in medical diagnostic equipment requiring <0.1°C resolution. IC Role / Device Role / Timing Role: Differential input rejects self-heating effects and EMI; 16-bit resolution resolves sub-millivolt thermistor voltage changes. Use Value: 2ppm/°C reference drift ensures stable full-scale reference across ambient temperature swings-critical for clinical-grade accuracy. |
Use Scenario: Replacing legacy 12-bit SAR ADCs in existing industrial controllers to improve dynamic range without board redesign. IC Role / Device Role / Timing Role: Pin-compatible upgrade (MSOP-12 or DFN-12) with identical footprint and I²C interface simplifies drop-in replacement. Use Value: 4-bit resolution increase (12→16) improves SNR by 24dB, enabling detection of subtle process anomalies previously buried in quantization noise. |
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 = internal 2.048V (±0.05% init, 15ppm/°C), no differential input range limit (±2.048V) | Higher full-scale range but worse reference drift; lacks programmable sleep mode-min sleep current 150µA | Prefer when wider input range or lower cost is critical; avoid where <5ppm/°C reference stability is required. |
| MCP3424-E/ST | 18-bit, 15sps/60sps/240sps, VREF = internal 2.048V (±0.05% init, 15ppm/°C), fixed 240sps max rate | Higher resolution but slower max rate; no 833sps option; higher sleep current (1µA vs 2µA) | Prefer for ultra-high-resolution static measurements; unsuitable for real-time multiplexed sampling at >200sps. |
Compared with ADS1115IDGSR and MCP3424-E/ST, the LTC2473IDD#TRPBF uniquely combines 2µA sleep current, ±5ppm/°C reference drift, and dual-speed operation (208/833sps) - making it optimal for battery-powered, high-stability, multi-channel sensing where timing flexibility and thermal accuracy are co-critical.
Availability
LTC2473IDD#TRPBF is available at Aetrix Electronics and suitable for industrial process control, environmental monitoring, and embedded instrumentation requiring stable component supply, extended temperature operation (–40°C to +85°C), and long-term production continuity.
Supply support for LTC2473IDD#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, serving industrial, automotive, communications, and healthcare markets.
The LTC2473IDD#TRPBF belongs to ADI's precision delta-sigma ADC product line, engineered for applications demanding low power, high DC accuracy, and simplified system integration-especially where external references, clocks, or calibration would compromise size, cost, or reliability.
FAQ
What is the operating temperature range for the LTC2473IDD#TRPBF?
The LTC2473IDD#TRPBF is rated for –40°C to +85°C (I-grade), verified across all electrical specifications including offset error (±1 mV), gain error (±0.01% FS), and reference drift (±5 ppm/°C). This range is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables of the official datasheet, and applies to both DFN and MSOP packages with I-grade marking.
Does the LTC2473IDD#TRPBF require an external reference?
No, the LTC2473IDD#TRPBF integrates a precision 1.25V reference with ±0.1% initial accuracy and ±5 ppm/°C max drift over temperature. REFOUT (Pin 1) provides this reference; it must be bypassed with ≤0.1µF to GND. External references are neither required nor recommended-overdriving REFOUT violates Absolute Maximum Ratings and may damage the device.
How does the LTC2473IDD#TRPBF achieve 2µA sleep current?
The LTC2473IDD#TRPBF reaches 2µA max sleep current by powering down both the ADC core and the integrated reference simultaneously when the SLP bit is set high via I²C. This state persists until a valid read/write command is acknowledged, at which point the reference restarts (12ms typical) before the next conversion begins-enabling ultra-low quiescent power in intermittent-sampling systems.
What is the meaning of "differential input range ±VREF" for the LTC2473IDD#TRPBF?
For the LTC2473IDD#TRPBF, "±VREF" means the differential input voltage (VIN+ – VIN–) can range from –1.25V to +1.25V. The output code is linear across this span: 0x0000 for –VREF, 0x8000 for 0V, and 0xFFFF for +VREF. Input voltages beyond ±VREF clamp to 0x0000 or 0xFFFF-no damage occurs, but measurement fidelity is lost.
Can the LTC2473IDD#TRPBF be used with a 3.3V microcontroller I²C bus?
Yes-the LTC2473IDD#TRPBF supports I²C standard/fast mode (≤400kHz) with VIH(MIN) = 0.7VCC and VIL(MAX) = 0.3VCC. When VCC = 3.3V, logic high is recognized above 2.31V and low below 0.99V, fully compatible with 3.3V GPIO. SDA is open-drain, so the pull-up resistor must connect to the same 3.3V domain as the MCU.
LTC2473IDD#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC2473IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2473IDD#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 LTC2473IDD#TRPBF reliable?
The price and inventory of LTC2473IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2473IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2473IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2473IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2473IDD#TRPBF?
LTC2473IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2473IDD#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 LTC2473IDD#TRPBF?
For technical support, including LTC2473IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2473IDD#TRPBF requirements.
6.How does Aetrix verify that LTC2473IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2473IDD#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 LTC2473IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2473IDD#TRPBF?
All LTC2473IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2473IDD#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 LTC2473IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC2473IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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