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Analog Devices Inc. LTC2484IDD#PBF
- Part No.:
- LTC2484IDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2484IDD#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,451
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Product details
Overview
LTC2484IDD#PBF from Analog Devices (formerly Linear Technology) is a 24-bit no-latency delta-sigma analog-to-digital converter with patented Easy Drive input current cancellation, rail-to-rail input range (0 V to VCC), 600 nVRMS noise, and programmable 50 Hz/60 Hz line rejection - designed for high-accuracy sensor digitization in industrial instrumentation and precision weighing systems.
For engineers reviewing the LTC2484IDD#PBF datasheet, LTC2484IDD#PBF pinout, LTC2484IDD#PBF application, or LTC2484IDD#PBF equivalent, key selection criteria include differential input current cancellation performance, internal oscillator accuracy over temperature, 2× speed mode timing, GND-to-VCC common-mode input flexibility, and SPI-compatible 4-wire interface behavior under sleep/wake transitions.
Technical Context
The LTC2484IDD#PBF implements a third-order delta-sigma modulator with transparent auto-calibration of offset and full-scale, eliminating drift without user intervention. Its Easy Drive architecture cancels differential input current via passive sampling network, enabling direct connection of high-impedance sources (e.g., strain gauges, thermistors) without buffer amplifiers.
It supports three line-rejection modes (50 Hz, 60 Hz, simultaneous 50/60 Hz) and a 2× speed mode (78.7 ms conversion time in 50 Hz mode), all selectable via SDI pin during data transfer. The internal oscillator operates at 307.2 kHz ±2% across –40°C to +85°C, and reference voltage may be as low as 100 mV or tied directly to VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit, no missing codes - guarantees monotonicity and full dynamic range utilization for precision measurement. |
| INL | 2 ppm of VREF max - ensures sub-ppm linearity error critical for calibration-grade instruments. |
| Offset Error | 0.5 µV typical - enables accurate zero-point referencing in microvolt-level sensor applications. |
| Output Noise | 600 nVRMS - supports 21.5 effective number of bits (ENOB) at 15 Hz output rate with 5 V reference. |
| Input Common Mode Range | 0 V to VCC - allows direct digitization of rail-to-rail signals without level-shifting circuitry. |
| Reference Range | 0.1 V to VCC - permits ultra-low-voltage references (e.g., 100 mV bandgap) or direct VCC tie for simplified design. |
| Supply Voltage | 2.7 V to 5.5 V - supports single-supply operation across battery-powered and industrial 3.3 V/5 V systems. |
| Operating Temp | –40°C to +85°C - qualified for industrial and automotive under-hood environments. |
Pinout & Package
Package: 10-lead (3 mm × 3 mm) plastic DFN with exposed pad (Pin 11 = GND). Thermal resistance θJA = 43°C/W. Exposed pad must be soldered to PCB ground plane for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SDI (Pin 1) | Serial Data Input | Latches 8-bit configuration word on SCK rising edge to select line rejection mode, temperature sensor, or 2× speed - no register programming required. |
| VCC (Pin 2) | Positive Supply | Requires local decoupling: 1 µF tantalum || 0.1 µF ceramic - low-ESR path essential for noise-sensitive delta-sigma operation. |
| VREF (Pin 3) | Reference Input | Accepts 0.1 V to VCC; negative reference is GND (Pin 8) - enables ratiometric or absolute measurements with flexible scaling. |
| IN+ / IN– (Pins 4, 5) | Differential Analog Inputs | Support rail-to-rail common-mode (GND–0.3 V to VCC+0.3 V); differential range = ±0.5 × VREF - eliminates need for input buffers. |
| CS (Pin 6) | Active-Low Chip Select | Wakes device from sleep (1 µA) into conversion/data mode; falling edge initiates conversion, rising edge aborts transfer and restarts cycle. |
| SDO (Pin 7) | Three-State Serial Output | Drives conversion result LSB-first on SCK falling edge; Hi-Z when CS = HIGH - enables multi-device SPI bus sharing. |
| GND (Pin 8) | Ground | Single-point analog/digital/reference ground - must connect directly to low-impedance PCB plane to prevent noise coupling. |
| SCK (Pin 9) | Bidirectional Clock | Auto-configures as output (internal clock mode) or input (external clock mode) based on logic state at CS fall - simplifies interface flexibility. |
| fO (Pin 10) | Frequency Control | GND = internal 307.2 kHz oscillator; driven externally to override filter nulls or adjust data rate - enables custom rejection frequencies. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive Input Current Cancellation | Zero differential input current enables direct connection of >1 MΩ source impedances (e.g., load cells, RTDs) without gain/offset errors. |
| No Latency Digital Filter | Settles in one conversion cycle - eliminates settling delay between samples, critical for real-time control loops. |
| Programmable Line Rejection | Hardware-selectable 50 Hz, 60 Hz, or simultaneous dual-frequency rejection - removes mains interference without firmware overhead. |
| Internal Trimmed Oscillator | 307.2 kHz ±2% over –40°C to +85°C - eliminates external crystal, reduces BOM count, and maintains rejection accuracy across temperature. |
| Continuous Auto-Calibration | Transparent offset and full-scale correction during normal operation - preserves 2 ppm INL and 1 ppm offset drift without calibration interrupts. |
| Single-Supply Operation | 2.7 V to 5.5 V supply with rail-to-rail inputs and 0.1 V minimum reference - supports battery-powered portable instruments and wide-input industrial sensors. |
Applications
| Weight Scales | Industrial Process Control |
|---|---|
Use Scenario: High-resolution load cell digitization in platform scales and hopper weighers requiring <10 µg resolution. IC Role / Device Role / Timing Role: Direct sensor digitizer with 24-bit resolution, 600 nVRMS noise, and 50/60 Hz rejection to suppress AC mains coupling in factory environments. Use Value: Eliminates external instrumentation amplifier and anti-aliasing filter, reducing component count and board area while maintaining NTEP-certifiable accuracy. | Use Scenario: Analog input module for PLCs measuring pressure, flow, and level transmitters with 4–20 mA or mV outputs. IC Role / Device Role / Timing Role: Precision ADC front-end with GND-to-VCC input range and programmable rejection - accepts unbuffered sensor outputs directly. Use Value: Supports universal analog input channel design across multiple sensor types without hardware reconfiguration or calibration per channel. |
| Direct Temperature Measurement | Strain Gauge Transducers |
Use Scenario: High-stability thermistor or RTD readout in environmental monitoring and medical devices where self-heating must be minimized. IC Role / Device Role / Timing Role: Low-power ADC with 0.5 µV offset and 1 µA sleep current - enables battery operation with 10-year lifetime in wireless sensor nodes. Use Value: Enables direct ratiometric measurement using internal reference or external precision resistor, avoiding excitation current errors. | Use Scenario: Wheatstone bridge readout in structural health monitoring and material testing systems requiring <0.001% full-scale accuracy. IC Role / Device Role / Timing Role: Differential ADC with zero differential input current and 2 ppm INL - rejects bridge imbalance errors caused by lead resistance and thermal EMFs. Use Value: Removes need for guarded Kelvin connections or active guarding circuits, simplifying PCB layout and improving long-term stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPWR | 24-bit, 4-kSPS max, integrated PGA and burn-out current sources; requires external reference; no built-in line rejection. | Best suited for multi-channel sensor arrays with programmable gain; lacks hardware-selectable 50/60 Hz rejection. | Select when system needs on-chip PGA or sensor diagnostics; avoid if mains rejection must be implemented in hardware without firmware. |
| MAX11206ETN+ | 24-bit, 10 SPS, internal oscillator ±1% accuracy; 1.2 µVRMS noise; no Easy Drive architecture. | Lower noise floor not achieved; higher input current requires buffering for >100 kΩ sources. | Select for cost-sensitive designs where 1 µV offset and 100 kΩ source impedance suffice; avoid for direct high-Z sensor interfaces. |
Compared with ADS124S08IPWR and MAX11206ETN+, the LTC2484IDD#PBF uniquely delivers hardware-based 50/60 Hz rejection, zero differential input current, and internal oscillator trimmed to ±2% - making it optimal for standalone, low-microcontroller-footprint precision sensor nodes requiring guaranteed line immunity and minimal external components.
Availability
LTC2484IDD#PBF is available at Aetrix Electronics and suitable for industrial process control, precision weighing systems, and direct temperature measurement applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LTC2484IDD#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LTC2484IDD#PBF belongs to ADI's precision delta-sigma ADC product line, engineered for applications demanding ultra-low noise, exceptional DC accuracy, and robust line-frequency rejection without software intervention.
FAQ
What is the operating temperature range of the LTC2484IDD#PBF?
The LTC2484IDD#PBF is rated for –40°C to +85°C, qualifying it for industrial and extended-temperature applications. This grade ('I') differs from the 'C' grade (0°C to 70°C) and is explicitly confirmed in the Order Information table of the datasheet. Thermal performance metrics-including oscillator frequency stability, INL, and noise-are specified across this full range.
Does the LTC2484IDD#PBF require an external crystal or oscillator?
No, the LTC2484IDD#PBF includes an on-chip trimmed oscillator operating at 307.2 kHz ±2% over –40°C to +85°C, eliminating the need for external timing components. The fO pin can be grounded to enable internal operation, or driven externally to override the clock for custom data rates or rejection frequencies.
How does Easy Drive technology benefit sensor interfacing in the LTC2484IDD#PBF?
Easy Drive technology in the LTC2484IDD#PBF cancels differential input current via a proprietary passive sampling network, resulting in near-zero differential input current. This allows direct connection of high-impedance sensors (e.g., strain gauges, thermistors) without buffer amplifiers, preserving signal integrity and eliminating associated offset, noise, and power penalties.
Can the LTC2484IDD#PBF reject both 50 Hz and 60 Hz simultaneously?
Yes, the LTC2484IDD#PBF supports simultaneous 50 Hz and 60 Hz line frequency rejection in hardware-selected via the SDI pin configuration. This mode uses an internal digital filter null centered at both frequencies, providing >87 dB normal-mode rejection without firmware-based DSP or external notch filters.
What is the conversion time of the LTC2484IDD#PBF in 2× speed mode with 50 Hz rejection?
In 2× speed mode with 50 Hz rejection, the LTC2484IDD#PBF achieves a conversion time of 78.7 ms (typical), as specified in the Timing Characteristics table. This is approximately half the 157.2 ms required in normal-speed 50 Hz mode, enabling faster sampling while retaining full line-rejection capability.
LTC2484IDD#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:
- 24
- 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:
- -
LTC2484IDD#PBF FAQ
1.How can I place an order for LTC2484IDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2484IDD#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 LTC2484IDD#PBF reliable?
The price and inventory of LTC2484IDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2484IDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2484IDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2484IDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2484IDD#PBF?
LTC2484IDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2484IDD#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 LTC2484IDD#PBF?
For technical support, including LTC2484IDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2484IDD#PBF requirements.
6.How does Aetrix verify that LTC2484IDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2484IDD#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 LTC2484IDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2484IDD#PBF?
All LTC2484IDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2484IDD#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 LTC2484IDD#PBF part is unused and in its original packaging.
Return procedure for LTC2484IDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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