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Analog Devices Inc. LTC2472IDD#TRPBF
- Part No.:
- LTC2472IDD#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LTC2472IDD#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 12DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,203
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Product details
Overview
LTC2472IDD#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit delta-sigma ADC with integrated 1.25V precision reference, differential ±VREF input range, and user-selectable 208sps or 833sps output rate. It operates from 2.7V to 5.5V, features SPI interface, and delivers 2ppm/°C reference drift, ±1mV offset error, and 0.01% gain error - enabling high-accuracy sensor digitization in industrial monitoring systems.
For engineers reviewing the LTC2472IDD#TRPBF datasheet, LTC2472IDD#TRPBF pinout, LTC2472IDD#TRPBF application, or LTC2472IDD#TRPBF equivalent, key selection criteria include its differential input architecture, ultra-low 2µA sleep current, single-cycle conversion settling, internal oscillator, and compatibility with multiplexed sensor arrays requiring no latency or external clocking.
Technical Context
The LTC2472IDD#TRPBF implements a proprietary delta-sigma modulator with sinc³ decimation filtering and an oversampling ratio of 8,192 (at 208sps) or 2,048 (at 833sps), relaxing anti-aliasing filter requirements. Its differential input stage accepts ±1.25V full-scale signals referenced to REF–, supporting true bipolar measurement without level-shifting circuitry.
Conversion control is managed via SPI with CS-active-low protocol; the device transitions automatically between CONVERT, NAP, and DATA INPUT/OUTPUT states. Reference startup time is 12ms (with 0.1µF COMP and REFOUT capacitors), and the internal oscillator eliminates external timing components - critical for space-constrained embedded designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 distinct output codes for high-fidelity analog sensing. |
| Reference Output | 1.25V ±3mV (1.247V–1.253V) - sets full-scale differential input range of ±1.25V. |
| Reference Drift | ±5ppm/°C (I-grade) - ensures <±0.5mV total drift over –40°C to +85°C operating range. |
| Offset Error | ±1mV (typ) - enables sub-LSB accuracy in low-level signal acquisition (e.g., thermocouple outputs). |
| Gain Error | ±0.01% FS (typ) - supports precise ratiometric measurements with stable excitation sources. |
| Supply Current | 3.5mA (typ, conversion), 2µA (max, sleep) - allows battery-powered operation with >10-year runtime at 1sps duty cycle. |
| Input Sampling Current | 50nA (typ) - permits direct RC filtering (e.g., 1kΩ/0.1µF) with <1LSB added error. |
Pinout & Package
Package: 12-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 13); rated for –40°C to +85°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 | Connects to 0.1µF capacitor to GND; controls reference startup time and transition noise. |
| CS (3) | Chip select (active low) | Enables SDO output and initiates DATA INPUT/OUTPUT state; rising edge aborts transfer and starts new conversion. |
| SDI (4) | Serial data input | Accepts 4-bit command (EN1/EN2/SPD/SLP) to configure output rate (208/833sps) and sleep mode. |
| SCK (5) | Serial clock input | Drives SPI timing; supports up to 2MHz; idle-high or idle-low (CPOL = 0 or 1) compatible. |
| SDO (6) | Serial data output | 3-state output delivering 16-bit MSB-first result; valid after CS low, synchronized to SCK falling edges. |
| GND (7,11,13) | Ground | Three dedicated ground connections including exposed thermal pad; require low-impedance PCB plane tie. |
| REF– (8) | Negative reference input | Sets zero-input point; tied directly to system ground or remote sensor ground for accurate common-mode rejection. |
| IN+ (9) | Differential positive input | Accepts voltage up to VREF; used with IN– for true differential measurement with ±1.25V full-scale range. |
| IN– (10) | Differential negative input | Accepts voltage down to 0V; complements IN+ for rejecting common-mode noise in noisy industrial environments. |
| VCC (12) | Positive supply | 2.7V–5.5V operation; requires local 10µF + 0.1µF parallel bypassing for clean ADC performance. |
Key Features
| Feature | Design Value |
|---|---|
| Differential input architecture | Supports true bipolar ±VREF measurement without external op-amps or level shifters - reduces BOM count and layout complexity. |
| User-selectable output rate | 208sps (8,192× OSR) or 833sps (2,048× OSR) - balances resolution, speed, and anti-aliasing filter design effort per application need. |
| Auto shutdown with configurable sleep | Enters NAP (70% current reduction) after conversion; optional SLP bit powers down both ADC and reference to 2µA - extends battery life. |
| Integrated oscillator | Eliminates external crystal or clock generator; removes timing component sourcing risk and board area for portable instrumentation. |
| Proprietary low-current sampling | 50nA average input current enables direct RC filtering with minimal signal degradation - simplifies front-end design for RTD or strain gauge interfaces. |
Applications
| Industrial Process Monitoring | Environmental Sensor Nodes |
|---|---|
|
Use Scenario: Continuous logging of pressure, flow, and temperature transducers in factory automation PLCs. IC Role / Device Role / Timing Role: Differential ADC digitizing 4–20mA loop outputs or bridge sensors with ratiometric reference stability. Use Value: 2ppm/°C reference drift and ±1mV offset ensure <±0.02% reading error across ambient temperature swings without recalibration. |
Use Scenario: Low-power wireless weather stations measuring humidity, CO₂, and particulate matter. IC Role / Device Role / Timing Role: High-resolution sensor interface with automatic sleep/wake cycling synchronized to RF transmission intervals. Use Value: 2µA sleep current enables multi-year operation on coin-cell batteries when paired with duty-cycled microcontrollers. |
| Direct Temperature Measurement | Embedded ADC Upgrade |
|
Use Scenario: Precision thermocouple or RTD readout in medical diagnostic equipment. IC Role / Device Role / Timing Role: Delta-sigma converter with cold-junction compensation reference and no-latency output for real-time thermal profiling. Use Value: Single-cycle settling and 16-bit resolution resolve <0.01°C increments in Type-K thermocouple systems with minimal firmware overhead. |
Use Scenario: Retrofitting legacy 12-bit SAR ADCs in test equipment to improve dynamic range and linearity. IC Role / Device Role / Timing Role: Pin-compatible drop-in replacement (MSOP-12 or DFN-12) adding integrated reference and SPI simplicity. Use Value: Eliminates external reference IC and clock circuitry while improving INL from ±4LSB to ±2LSB - reducing calibration time and cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPW | 24-bit resolution, 4.8ksps max, integrated PGA and burnout current; requires external reference; 2.5V–5.5V supply. | Better suited for ultra-low-level sensor signals (e.g., load cells) requiring programmable gain; higher power (350µA active). | Select ADS124S08IPW when >16-bit resolution and on-chip PGA are required; avoid if reference integration and 2µA sleep are mandatory. |
| MAX11206ETL+ | 18-bit resolution, 120sps max, internal 2.048V reference (5ppm/°C), SPI interface; 2.7V–3.6V supply only. | Optimized for low-voltage battery systems; lacks differential input flexibility and 833sps mode; smaller 10-lead TDFN package. | Select MAX11206ETL+ for compact, single-supply 3.3V designs where 18-bit resolution outweighs speed and input range needs. |
Compared with ADS124S08IPW and MAX11206ETL+, the LTC2472IDD#TRPBF uniquely combines 16-bit precision, differential ±1.25V input, integrated 1.25V reference with 5ppm/°C drift, 833sps capability, and 2µA sleep - making it optimal for industrial sensor nodes demanding balanced performance, power, and integration.
Availability
LTC2472IDD#TRPBF is available at Aetrix Electronics and suitable for industrial process control, environmental monitoring, and embedded instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed I-grade temperature performance.
Supply support for LTC2472IDD#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 LTC2472IDD#TRPBF belongs to ADI's legacy Linear Technology precision delta-sigma ADC family, designed specifically for low-power, high-accuracy sensor digitization in space- and energy-constrained embedded systems.
FAQ
What is the operating temperature range of the LTC2472IDD#TRPBF?
The LTC2472IDD#TRPBF is rated for –40°C to +85°C operation (I-grade). This extended range ensures reliable performance in industrial control cabinets, outdoor environmental enclosures, and automotive under-hood sensor modules where ambient temperatures exceed commercial limits. The part maintains specified offset drift (±5ppm/°C), gain error (±0.01%), and sleep current (2µA max) across this full range.
Does the LTC2472IDD#TRPBF require an external clock source?
No, the LTC2472IDD#TRPBF includes a fully integrated oscillator and requires no external clock components. This eliminates timing component sourcing, reduces PCB footprint, and avoids clock jitter concerns that degrade delta-sigma ADC performance. The internal oscillator drives all conversion timing, reference startup, and SPI synchronization - confirmed in the "Internal Oscillator-No External Components Required" feature list and block diagram.
How does the LTC2472IDD#TRPBF achieve low input current during sampling?
The LTC2472IDD#TRPBF uses a proprietary input sampling scheme that reduces average input current to 50nA (typ), several orders of magnitude lower than conventional delta-sigma converters. This enables direct connection of RC filters (e.g., 1kΩ/0.1µF) with <1LSB added error - critical for interfacing with high-impedance sensors like thermistors or pH electrodes without buffer amplifiers.
Can the LTC2472IDD#TRPBF operate with a 3.3V supply?
Yes, the LTC2472IDD#TRPBF operates from 2.7V to 5.5V, fully supporting standard 3.3V logic and supply rails. At 3.3V, it maintains all key specifications: 16-bit resolution, ±1mV offset error, 0.01% gain error, and 2µA sleep current. The reference output remains stable at 1.25V, and SPI timing (2MHz SCK max) is preserved - verified in Electrical Characteristics and Power Requirements tables.
What is the function of the COMP pin on the LTC2472IDD#TRPBF?
The COMP pin (Pin 2) provides internal reference compensation and must be connected to a 0.1µF capacitor to GND. This capacitor sets both reference startup time (12ms typical) and transition noise performance. Reducing the COMP capacitor lowers startup time but increases RMS noise - a trade-off documented in Figure 3 and Figure 4 of the datasheet. The COMP capacitor value must be ≤ the REFOUT bypass capacitor value for stability.
LTC2472IDD#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:
- SPI
- 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:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 12-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2472IDD#TRPBF FAQ
1.How can I place an order for LTC2472IDD#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2472IDD#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 LTC2472IDD#TRPBF reliable?
The price and inventory of LTC2472IDD#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2472IDD#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2472IDD#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2472IDD#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2472IDD#TRPBF?
LTC2472IDD#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2472IDD#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 LTC2472IDD#TRPBF?
For technical support, including LTC2472IDD#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2472IDD#TRPBF requirements.
6.How does Aetrix verify that LTC2472IDD#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2472IDD#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 LTC2472IDD#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2472IDD#TRPBF?
All LTC2472IDD#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2472IDD#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 LTC2472IDD#TRPBF part is unused and in its original packaging.
Return procedure for LTC2472IDD#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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