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Analog Devices Inc. LTC2480IDD#PBF
- Part No.:
- LTC2480IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2480IDD#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:663
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Product details
Overview
LTC2480IDD#PBF from Analog Devices (formerly Linear Technology) is a 16-bit plus sign no-latency delta-sigma analog-to-digital converter with patented Easy Drive input current cancellation. It delivers 2 ppm INL, 1 ppm offset error, and simultaneous 50 Hz/60 Hz line rejection - enabling direct digitization of rail-to-rail, high-impedance sensor signals (e.g., strain gauges, load cells) without external buffering or precision op-amps.
For engineers reviewing the LTC2480IDD#PBF datasheet, LTC2480IDD#PBF pinout, LTC2480IDD#PBF application, or LTC2480IDD#PBF equivalent, key selection criteria include its programmable gain (1–256), internal oscillator eliminating external crystals, GND-to-VCC common-mode input range independent of reference voltage, and guaranteed no missing codes across –40°C to +85°C industrial temperature range.
Technical Context
The LTC2480IDD#PBF implements a third-order delta-sigma modulator with continuous auto-calibration for offset and full-scale correction. Its Easy Drive sampling architecture cancels differential input current dynamically, enabling accurate measurement from sources up to 100 kΩ without signal degradation.
It supports two conversion speed modes: normal (15 Hz output rate with internal oscillator) and 2× speed (30 Hz), both with selectable 50 Hz, 60 Hz, or simultaneous 50/60 Hz rejection. The device uses a 4-wire SPI-compatible interface with configurable SCK direction (input or output) and CS-controlled sleep/wake sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit plus sign, no missing codes - ensures monotonicity and unambiguous digital representation of analog inputs. |
| INL | 2 ppm of VREF (typical) - enables sub-μV-level accuracy in precision instrumentation applications. |
| Offset Error | 0.5 µV (max, over temp) - eliminates need for system-level zero-point calibration in high-stability designs. |
| Line Rejection | Simultaneous 50 Hz/60 Hz at 87 dB - suppresses mains-borne noise without external notch filters. |
| Supply Range | 2.7 V to 5.5 V - compatible with single-cell Li-ion, 3.3 V, and 5 V logic domains. |
| Operating Temp | –40°C to +85°C - qualified for industrial control and embedded sensing environments. |
| Power (Conv) | 160 µA typical - allows battery-powered operation with multi-second conversion intervals. |
Pinout & Package
Package: 10-lead (3 mm × 3 mm) plastic DFN with exposed pad (Pin 11 = GND). RoHS-compliant, lead-free finish (PBF).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDI (1) | Serial Data Input | Configures gain, line rejection mode, input source (IN+/temp), and 2× speed via 8-bit command on rising SCK edge. |
| VCC (2) | Positive Supply | Single supply input; requires local 1 µF + 0.1 µF bypassing to GND (Pin 8) for noise immunity. |
| VREF (3) | Reference Input | Accepts 0.1 V to VCC; reference common-mode rejection >120 dB DC enables flexible ratiometric or absolute measurements. |
| IN+ (4), IN– (5) | Differential Analog Inputs | Rail-to-rail common-mode range (GND to VCC); Easy Drive eliminates input current errors even at 100 kΩ source impedance. |
| CS (6) | Active-Low Chip Select | Wakes ADC from sleep (1 µA) into conversion/data output; falling edge initiates new conversion cycle. |
| SDO (7) | Three-State Serial Output | Outputs 24-bit result on falling SCK edges; Hi-Z when CS = HIGH to prevent bus contention. |
| GND (8) | Analog/Digital Ground | Shared AGND/DGND/REFGND node; must connect directly to low-impedance PCB ground plane. |
| SCK (9) | Bidirectional Clock | Auto-configured as input (external clock) or output (internal oscillator clock) based on power-up state. |
| fO (10) | Oscillator Control | GND = internal 307.2 kHz oscillator; driven externally to adjust data rate or filter null placement. |
| Exposed Pad (11) | Thermal/Ground | Must be soldered to PCB ground for thermal dissipation (θJA = 43°C/W) and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive Input Current Cancellation | Zero net differential input current enables direct connection to high-impedance sensors (e.g., thermistors, bridge transducers) without gain error. |
| No-Latency Delta-Sigma Architecture | Digital filter settles in one conversion cycle - eliminates group delay in closed-loop control feedback paths. |
| Programmable Gain (1–256) | Eight discrete gain steps allow optimization of dynamic range for varying sensor output amplitudes without external amplifiers. |
| Internal Trimmed Oscillator | Eliminates external crystal/capacitor components; factory-trimmed to ±0.5% accuracy over temperature. |
| Rail-to-Rail Input Common-Mode Range | Independent of VREF value - simplifies front-end design when using low-voltage references or battery-supplied sensors. |
Applications
| Weight Scales | Industrial Process Control |
|---|---|
Use Scenario: High-resolution weighing of industrial loads using 350 Ω strain gauge bridges with mV/V output. IC Role / Device Role / Timing Role: Direct sensor digitizer with 256× gain, simultaneous 50/60 Hz rejection, and 16-bit resolution for <10 mg repeatability. Use Value: Eliminates external instrumentation amplifier and analog filtering, reducing BOM count and layout sensitivity to EMI. | Use Scenario: Monitoring pressure, flow, or level in PLC-connected field transmitters operating in noisy factory environments. IC Role / Device Role / Timing Role: Precision ADC with –40°C to +85°C rating, 1 ppm offset drift, and robust PSRR (>120 dB) against supply ripple. Use Value: Maintains calibration stability over temperature and time, reducing field recalibration frequency and maintenance cost. |
| Direct Temperature Measurement | Strain Gauge Transducers |
Use Scenario: Embedded temperature monitoring using on-chip PTAT sensor or external thermistor in HVAC controllers. IC Role / Device Role / Timing Role: Dual-input mux selects between IN+ and internal temperature sensor; 16-bit resolution yields <0.01°C quantization step. Use Value: Enables dual-function sensor nodes (e.g., temp + strain) without adding a separate temperature IC or ADC channel. | Use Scenario: Full-bridge strain measurement in structural health monitoring systems requiring long-term drift stability. IC Role / Device Role / Timing Role: Low-drift (15 ppm FS error), low-noise (0.6 µVRMS) ADC with automatic offset/full-scale calibration. Use Value: Delivers <10 ppm/year drift performance without manual recalibration, extending system service life. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPWR | 24-bit resolution, integrated PGA and burnout current sources; no internal oscillator; requires external clock. | Higher resolution but larger footprint (20-pin TSSOP); lacks simultaneous 50/60 Hz rejection; better suited for ultra-low-frequency sensor arrays. | Select when >16-bit resolution and programmable excitation current are required; avoid if board space or line-rejection simplicity is critical. |
| MAX11206ETL+ | 18-bit resolution, 2.5 V internal reference, fixed 50/60 Hz rejection; no programmable gain; 12-lead TDFN package. | Lower integration (no temp sensor, no gain control); optimized for low-power portable DMMs rather than industrial transducers. | Choose for cost-sensitive, lower-resolution applications where internal reference suffices and gain flexibility is unnecessary. |
Compared with ADS124S08IPWR and MAX11206ETL+, the LTC2480IDD#PBF uniquely combines 16-bit precision, Easy Drive input cancellation, simultaneous dual-line rejection, and internal oscillator in a compact 10-lead DFN - making it optimal for space-constrained, high-EMI industrial sensor interfaces requiring minimal external components.
Availability
LTC2480IDD#PBF is available at Aetrix Electronics and suitable for weight scales, industrial process control systems, and strain gauge transducer interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LTC2480IDD#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 LTC2480 belongs to ADI's precision delta-sigma ADC product line, designed specifically for direct digitization of high-impedance, low-bandwidth sensors in harsh electrical environments - emphasizing ease of use, noise immunity, and long-term stability.
FAQ
What is the maximum source impedance supported by the LTC2480IDD#PBF without accuracy degradation?
The LTC2480IDD#PBF supports source impedances up to 100 kΩ while maintaining specified INL and offset error, thanks to its patented Easy Drive input current cancellation architecture. This eliminates dynamic input current errors that would otherwise cause gain and offset shifts in conventional delta-sigma ADCs - enabling direct connection to resistive sensors like thermistors and unbuffered strain gauges without external op-amps.
Does the LTC2480IDD#PBF require an external crystal or oscillator?
No, the LTC2480IDD#PBF includes a factory-trimmed internal oscillator operating at 307.2 kHz, eliminating the need for external crystals, capacitors, or clock generators. The fO pin can be grounded to enable this oscillator; alternatively, an external clock (10–1000 kHz) may be applied to fO to adjust conversion rate or fine-tune filter nulls - providing flexibility without added BOM cost.
How does the LTC2480IDD#PBF achieve simultaneous 50 Hz and 60 Hz line frequency rejection?
The LTC2480IDD#PBF achieves simultaneous 50 Hz/60 Hz rejection through a digitally configured notch filter in its delta-sigma modulator's decimation stage. When configured via SDI command, the internal digital filter places nulls at both frequencies - delivering 87 dB attenuation without requiring external analog filters or dual-mode switching. This is validated across the full –40°C to +85°C operating range.
What is the function of the exposed pad (Pin 11) on the LTC2480IDD#PBF DFN package?
The exposed pad (Pin 11) on the LTC2480IDD#PBF is electrically and thermally connected to GND. It must be soldered to a PCB ground plane to ensure proper thermal dissipation (θJA = 43°C/W) and minimize noise coupling. Leaving it floating degrades thermal performance and increases susceptibility to EMI - violating the device's specified reliability and accuracy guarantees.
Can the LTC2480IDD#PBF measure its own die temperature?
Yes, the LTC2480IDD#PBF integrates a PTAT (proportional-to-absolute-temperature) sensor with a nominal output of 420 mV at 27°C. By configuring the SDI command to select the internal temperature sensor instead of IN+ and IN–, the device outputs a calibrated 16-bit reading representing junction temperature - useful for thermal compensation of external sensors or system-level thermal monitoring without adding discrete temperature ICs.
LTC2480IDD#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 5.5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.5V
- Features:
- Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2480IDD#PBF FAQ
1.How can I place an order for LTC2480IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2480IDD#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 LTC2480IDD#PBF reliable?
The price and inventory of LTC2480IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2480IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2480IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2480IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2480IDD#PBF?
LTC2480IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2480IDD#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 LTC2480IDD#PBF?
For technical support, including LTC2480IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2480IDD#PBF requirements.
6.How does Aetrix verify that LTC2480IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2480IDD#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 LTC2480IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2480IDD#PBF?
All LTC2480IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2480IDD#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 LTC2480IDD#PBF part is unused and in its original packaging.
Return procedure for LTC2480IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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