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Analog Devices Inc. LTC2484CDD#PBF
- Part No.:
- LTC2484CDD#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC2484CDD#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,803
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Product details
Overview
LTC2484CDD#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 (0V to VCC), and integrated oscillator. It delivers 600nVRMS noise, 2ppm INL, and simultaneous 50Hz/60Hz line rejection - enabling direct digitization of high-impedance sensors in precision weight scales and industrial process control systems.
For engineers reviewing the LTC2484CDD#PBF datasheet, LTC2484CDD#PBF pinout, LTC2484CDD#PBF application, or LTC2484CDD#PBF equivalent, key selection criteria include differential input current cancellation performance, programmable line-frequency rejection mode, internal oscillator operation at 307.2kHz, 10-lead DFN package thermal characteristics, and guaranteed no missing codes over temperature.
Technical Context
The LTC2484CDD#PBF implements a third-order delta-sigma modulator with transparent auto-calibration for offset and full-scale, eliminating drift without user intervention. Its Easy Drive architecture cancels differential input current dynamically via passive sampling, enabling direct connection to sensors with source impedances up to 100kΩ while maintaining DC accuracy.
It supports three line-rejection configurations (50Hz, 60Hz, or simultaneous 50Hz/60Hz) and a 2× speed mode (15Hz output rate using internal oscillator). The device operates with reference voltages as low as 100mV and accepts common-mode inputs from GND to VCC independent of VREF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit, no missing codes - guarantees monotonicity and unambiguous digital representation across full input range. |
| INL | 2ppm of VREF - ensures sub-1-LSB linearity error at 2.5V reference, critical for high-accuracy weigh scale calibration. |
| Output Noise | 600nVRMS - enables 0.1µV-level resolution in low-drift instrumentation applications. |
| Offset Error | ±0.5µV typical - eliminates need for system-level zero-point trimming in precision sensor interfaces. |
| Supply Range | 2.7V to 5.5V - supports single-supply operation from Li-ion batteries or industrial 3.3V/5V rails. |
| Line Rejection | Simultaneous 50Hz/60Hz - suppresses AC mains interference without external notch filters or software averaging. |
| Conversion Rate | 7.5 SPS (normal), 15 SPS (2× speed) - balances resolution, noise, and update rate for static or quasi-static measurements. |
Pinout & Package
Package: 10-lead (3mm × 3mm) plastic DFN with exposed pad (Pin 11 = GND), θJA = 43°C/W, operating temperature range 0°C to 70°C (C-grade).
| 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 | Accepts 2.7V–5.5V; requires local 1µF tantalum + 0.1µF ceramic bypass to GND (Pin 8) for stable conversion performance. |
| VREF (Pin 3) | Reference Input | Supports 0.1V to VCC range; negative reference is GND - enables low-voltage reference designs without external buffers. |
| IN+ / IN– (Pins 4, 5) | Differential Analog Inputs | Rail-to-rail common-mode (GND to VCC); differential range = ±0.5 × VREF - directly interfaces strain gauges and RTDs without level-shifting. |
| CS (Pin 6) | Active-Low Chip Select | Wakes device from sleep (1µA) into conversion/data mode; HIGH = automatic sleep after data transfer. |
| SDO (Pin 7) | Three-State Serial Output | Drives conversion result MSB-first on SCK falling edge; Hi-Z when CS = HIGH - simplifies bus sharing. |
| GND (Pin 8) | Ground | Single-pin analog/digital/reference ground - must connect to low-impedance PCB plane; exposed pad (Pin 11) is also GND. |
| SCK (Pin 9) | Bidirectional Clock | Configured as output (internal clock) or input (external clock) at power-up - determines serial interface timing mode automatically. |
| fO (Pin 10) | Frequency Control | GND = internal 307.2kHz oscillator; driven externally to adjust data rate or shift filter nulls - enables custom rejection profiles. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive Input Current Cancellation | Zero differential input current enables direct connection to high-impedance bridges and thermistors without signal degradation or external amplifiers. |
| No Latency Digital Filter | Settles in one conversion cycle - eliminates group delay in closed-loop control or real-time monitoring applications. |
| Internal Trimmed Oscillator | Eliminates external crystal or clock source; factory-trimmed to ±0.5% over temperature - reduces BOM count and layout area. |
| GND-to-VCC Input Common-Mode Range | Allows sensor outputs referenced to system ground or supply rail without level-shifting circuitry - simplifies front-end design. |
| Programmable Line-Frequency Rejection | Hardware-selectable 50Hz, 60Hz, or dual-band rejection - removes mains interference without firmware overhead or post-processing. |
Applications
| Weight Scales | Direct Temperature Measurement |
|---|---|
Use Scenario: High-precision platform scales measuring loads from 1g to 100kg using 350Ω strain gauge bridges with 1–10mV/V sensitivity. IC Role / Device Role / Timing Role: Direct sensor digitizer with Easy Drive cancellation - acquires bridge output without instrumentation amplifier, rejecting 50/60Hz noise in factory environments. Use Value: Achieves <10ppm total unadjusted error and <0.1µV RMS noise, enabling 1:1,000,000 resolution without calibration drift compensation. | Use Scenario: Industrial temperature monitoring of motor windings or reactor vessels using 100Ω Pt100 RTDs in 2-wire or 3-wire configurations. IC Role / Device Role / Timing Role: Precision ratiometric ADC with rail-to-rail input - measures RTD voltage drop against same reference, rejecting lead resistance errors. Use Value: Delivers 0.01°C repeatability over 0°C–70°C due to 1ppm offset drift and simultaneous line-frequency rejection. |
| Strain Gauge Transducers | Industrial Process Control |
Use Scenario: Load cell interfaces in hydraulic press controls where sensor impedance exceeds 50kΩ and excitation is derived from VCC. IC Role / Device Role / Timing Role: High-Z differential input ADC with GND-to-VCC common-mode range - accepts unbuffered bridge outputs referenced to system ground or supply rail. Use Value: Maintains 2ppm INL and 600nV RMS noise despite 100kΩ source impedance, eliminating need for op-amp buffering stages. | Use Scenario: Analog input module for PLCs acquiring 4–20mA loop signals via precision shunt resistors in noisy factory settings. IC Role / Device Role / Timing Role: Low-power, high-EMI-immunity ADC with programmable 50/60Hz rejection - digitizes shunt voltage while rejecting conducted mains noise. Use Value: Enables 24-bit resolution with <15ppm total unadjusted error and 1µA sleep current - extends module battery life and improves measurement integrity. |
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, 4kSPS max, integrated PGA and burn-out current sources; requires external reference; no built-in line-rejection filter. | Optimized for multiplexed sensor arrays with programmable gain; lacks hardware-selectable 50/60Hz rejection. | Select when multi-channel scanning or programmable gain is required; avoid if simultaneous line-frequency rejection is mandatory. |
| MAX11200EEE+ | 24-bit, 10SPS, internal oscillator only (no external fO pin); 16-pin TSSOP; higher 1.2µVRMS noise. | Lower integration (no temperature sensor, no SDI-configurable modes); simpler interface but less flexible filtering. | Select for cost-sensitive, fixed-function designs where 2× speed mode and dual-band rejection are unnecessary. |
Compared with ADS124S08IPWR and MAX11200EEE+, the LTC2484CDD#PBF uniquely combines hardware-programmable line rejection, zero-differential-input-current front end, and internal oscillator with external override - making it optimal for standalone, low-noise, mains-immune sensor digitization without microcontroller intervention.
Availability
LTC2484CDD#PBF is available at Aetrix Electronics and suitable for precision weight scales, industrial temperature measurement, strain gauge transducers, and process control instrumentation requiring stable component supply and long-term calibration integrity.
Supply support for LTC2484CDD#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC2484 product line was designed for ultra-precision, low-power, direct-sensor-digitization applications - targeting industrial instrumentation, test equipment, and high-end consumer weighing systems where noise, drift, and EMI immunity are critical.
FAQ
What is the operating temperature range for the LTC2484CDD#PBF?
The LTC2484CDD#PBF is rated for 0°C to 70°C ambient operation (C-grade). This is confirmed in the Absolute Maximum Ratings table and Order Information section of the datasheet, where "CDD" denotes the commercial temperature grade. It uses a 10-lead DFN package with exposed pad soldered to PCB ground for thermal management.
Does the LTC2484CDD#PBF require an external crystal or oscillator?
No, the LTC2484CDD#PBF includes an on-chip trimmed oscillator operating at 307.2kHz when the fO pin is tied to GND. External clocking is optional via the fO pin to adjust data rate or shift filter nulls - eliminating BOM cost and board space for crystals in most applications.
How does the Easy Drive technology in the LTC2484CDD#PBF improve sensor interface performance?
The Easy Drive technology in the LTC2484CDD#PBF cancels differential input current dynamically through a passive sampling network, enabling direct connection to high-impedance sensors (e.g., 100kΩ strain gauges) without external op-amps while preserving DC accuracy and rail-to-rail input range - a capability verified in Figure TA02 and Applications Information section.
Can the LTC2484CDD#PBF reject both 50Hz and 60Hz line noise simultaneously?
Yes, the LTC2484CDD#PBF supports simultaneous 50Hz/60Hz line frequency rejection in hardware - selectable via the SDI pin configuration. This mode is explicitly specified in Electrical Characteristics tables and Typical Performance graphs (e.g., G23–G25), delivering >87dB normal-mode rejection without software averaging or external filters.
What is the minimum reference voltage supported by the LTC2484CDD#PBF?
The LTC2484CDD#PBF supports reference voltages as low as 0.1V, per the Analog Input and Reference specifications table. This allows use with low-dropout references or direct connection to scaled-down supply rails - enabling high-resolution measurements even with sub-1V references while maintaining full 24-bit no-missing-codes performance.
LTC2484CDD#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 10-DFN (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2484CDD#PBF FAQ
1.How can I place an order for LTC2484CDD#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2484CDD#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 LTC2484CDD#PBF reliable?
The price and inventory of LTC2484CDD#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2484CDD#PBF is usually 5 days.
3.What payment methods are accepted for LTC2484CDD#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2484CDD#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2484CDD#PBF?
LTC2484CDD#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2484CDD#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 LTC2484CDD#PBF?
For technical support, including LTC2484CDD#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2484CDD#PBF requirements.
6.How does Aetrix verify that LTC2484CDD#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2484CDD#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 LTC2484CDD#PBF meets industry standards.
7.What is the process for return or replacement of LTC2484CDD#PBF?
All LTC2484CDD#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2484CDD#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 LTC2484CDD#PBF part is unused and in its original packaging.
Return procedure for LTC2484CDD#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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