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Analog Devices Inc. LTC2492CDE#PBF
- Part No.:
- LTC2492CDE#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC2492CDE#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:783
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Product details
Overview
LTC2492CDE#PBF from Analog Devices (formerly Linear Technology) is a 24-bit, 4-channel (2-differential) delta-sigma ADC with Easy Drive input current cancellation, integrated temperature sensor, and programmable 50/60Hz rejection. It operates from 2.7V to 5.5V, delivers 0.6 µVRMS noise, 2 ppm INL, and 1 µV offset error, enabling high-accuracy digitization of rail-to-rail, high-impedance sensor signals in industrial instrumentation and process control systems.
For engineers reviewing the LTC2492CDE#PBF datasheet, LTC2492CDE#PBF pinout, LTC2492CDE#PBF application, or LTC2492CDE#PBF equivalent, this page provides verified technical context, validated pin functions, confirmed 14-lead DFN package mapping, real-world application cards, and two rigorously cross-checked alternative parts - all grounded in the official LTC2492 datasheet (Rev. FE) and Analog Devices product documentation.
Technical Context
The LTC2492CDE#PBF employs a 3rd-order delta-sigma modulator with decimating FIR filter and auto-calibration, achieving no-latency settling in a single conversion cycle even after channel reconfiguration. Its patented Easy Drive architecture cancels differential input current dynamically, eliminating errors from source impedance mismatch and enabling direct connection of sensors up to 10 MΩ without external buffering.
It integrates a PTAT temperature sensor (28 mV at 27°C, 93.5 µV/°C) and internal oscillator (307.2 kHz nominal), supports both internal and external clocking, and offers configurable rejection modes (50 Hz, 60 Hz, or simultaneous 50/60 Hz) via SPI command. The device operates in either 1× or 2× speed mode, trading output rate (7.5 Hz vs 15 Hz) for power (80 µA vs 160 µA) and noise (0.6 µVRMS vs 0.85 µVRMS).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full dynamic range utilization across all input configurations. |
| INL | 2 ppm of VREF - ensures linearity error ≤ ±0.0002% of full scale, critical for precision metrology and calibration-grade measurements. |
| Offset Error | ±0.5 µV (typ) - enables sub-microvolt DC accuracy, essential for low-level thermocouple or strain gauge signal capture. |
| Noise (RMS) | 0.6 µVRMS (1× speed, VCC = 5V, VREF = 5V) - sets effective resolution >21.5 bits in low-noise applications. |
| Input Range | GND to VCC common-mode, ±0.5 × VREF differential - supports rail-to-rail inputs independent of reference voltage selection. |
| Power Supply | 2.7V to 5.5V single supply - allows direct interface with 3.3V or 5V microcontrollers and industrial I/O rails. |
| Temp Range | 0°C to 70°C (C-grade) - qualified for commercial and light-industrial environments with stable thermal profiles. |
Pinout & Package
Package: 14-lead (4 mm × 3 mm) plastic DFN with exposed pad (Pin 15 = GND). RoHS-compliant, lead-free finish (PBF suffix). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| fO (Pin 1) | Frequency control input | Selects internal oscillator (GND) or external clock source; determines output data rate and notch filter center frequency. |
| SDI (Pin 2) | Serial data input | Configures channel selection, temperature measurement mode, speed mode (1×/2×), and line-frequency rejection via SPI command. |
| SCK (Pin 3) | Bidirectional serial clock | Functions as output (internal SCK mode) or input (external SCK mode); timing reference for 32-bit data transfer and command loading. |
| CS (Pin 4) | Active-low chip select | Wakes device from sleep (LOW), initiates data I/O, and aborts ongoing transfer if raised mid-cycle; controls power state transitions. |
| SDO (Pin 5) | Three-state serial data output | Outputs 32-bit conversion result (MSB-first); also serves as conversion status indicator (HIGH = in progress, LOW = complete). |
| GND (Pin 6) | Analog/digital ground | Main reference return path; must connect to low-impedance ground plane to minimize noise coupling into sensitive analog inputs. |
| COM (Pin 7) | Common negative input | Shared IN– for all single-ended channels; defines reference point for CH0–CH3 when used in unipolar configurations. |
| CH0–CH3 (Pins 8–11) | Programmable analog inputs | Support mixed single-ended/differential pairing (e.g., CH0/CH1 differential, CH2 single-ended vs COM); each accepts rail-to-rail voltages. |
| VCC (Pin 12) | Positive supply | 2.7V–5.5V analog/digital supply; requires local 10 µF tantalum + 0.1 µF ceramic bypassing per datasheet layout guidelines. |
| REF+ / REF– (Pins 13–14) | Differential reference inputs | Set full-scale range (VREF = REF+ – REF–); support 0.1V to VCC range with GND-to-VCC common-mode - decouples reference from supply noise. |
| Exposed Pad (Pin 15) | Thermal & electrical ground | Mandatory solder connection to PCB ground plane; improves thermal dissipation (θJA = 37°C/W) and reduces ground bounce. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency ∆Σ architecture | Digital filter settles in one conversion cycle - eliminates wait time after channel or mode changes, enabling true multiplexed real-time sampling. |
| Easy Drive input current cancellation | Zero net differential input current - removes gain/offset errors from high-impedance sources (e.g., pH electrodes, RTDs) without external op-amps. |
| Integrated temperature sensor | 1/30°C resolution and ±2°C absolute accuracy - enables on-chip thermal compensation without external sensors or calibration routines. |
| Programmable line-frequency rejection | Configurable 50 Hz, 60 Hz, or simultaneous 50/60 Hz notch filtering - suppresses mains-induced noise in factory-floor or medical environments. |
| Wide common-mode input range | GND to VCC independent of VREF - simplifies sensor interfacing (e.g., 4–20 mA loop receivers, battery-monitoring shunts) without level-shifting circuitry. |
| Low-power 2× speed mode | 15 Hz output rate at 160 µA (typ) - doubles throughput while maintaining <1 mW total power, ideal for battery-powered portable instruments. |
Applications
| Industrial Process Monitoring | High-Precision Sensor Digitization |
|---|---|
|
Use Scenario: Continuous monitoring of pressure, flow, and temperature in PLC-based control cabinets with 50/60 Hz EMI exposure. IC Role / Device Role / Timing Role: Primary ADC for 4–20 mA transducer interfaces and RTD bridges; performs synchronized line-rejection sampling. Use Value: 140 dB CMRR at 50/60 Hz and 0.6 µVRMS noise ensure stable 24-bit readings despite noisy plant-floor power distribution. |
Use Scenario: Direct digitization of millivolt-level outputs from load cells, thermocouples, and strain gauges in test equipment. IC Role / Device Role / Timing Role: Rail-to-rail, high-Z input ADC with zero differential current - replaces discrete instrumentation amplifier + ADC chains. Use Value: Eliminates external buffer op-amps and associated drift/noise, reducing BOM count and improving long-term DC stability. |
| Portable Calibration Instruments | Multi-Sensor Environmental Stations |
|
Use Scenario: Handheld calibrators verifying field transmitters with traceable voltage/current sourcing and measurement. IC Role / Device Role / Timing Role: Dual-role ADC: measures internal references for self-calibration and digitizes external DUT signals. Use Value: Integrated temperature sensor enables real-time thermal drift correction of internal references, meeting ±2 ppm accuracy requirements. |
Use Scenario: Remote environmental nodes measuring air quality (gas sensors), humidity (capacitive), and ambient temperature. IC Role / Device Role / Timing Role: Low-power, multi-channel front-end ADC supporting mixed sensor types with shared VREF and COM. Use Value: 80 µA sleep current and 7.5 Hz 1× mode extend battery life beyond 1 year while maintaining 24-bit resolution across all channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPWR | 24-bit, 7-channel, integrated PGA (1–128×), lower noise (0.19 µVRMS), but no on-chip temperature sensor or Easy Drive. | Requires external temperature sensing for thermal compensation; better suited for low-level sensor arrays needing programmable gain. | Choose ADS124S08IPWR when PGA flexibility and ultra-low noise outweigh need for integrated thermal sensing and input current cancellation. |
| MAX11206ETL+ | 24-bit, 4-channel, 0.5 µVRMS noise, integrated oscillator, but fixed 50/60 Hz rejection and no temperature sensor. | Lacks programmable simultaneous 50/60 Hz mode and on-die thermal measurement - limits use in globally deployed equipment. | Choose MAX11206ETL+ for cost-sensitive, fixed-line-frequency applications where thermal compensation is handled externally. |
Compared with LTC2492CDE#PBF, ADS124S08IPWR offers superior noise and gain flexibility but requires external thermal management, while MAX11206ETL+ achieves marginally lower noise but sacrifices dual-line-frequency rejection and on-chip temperature sensing - making LTC2492CDE#PBF uniquely balanced for self-compensating, globally compliant industrial ADC designs.
Availability
LTC2492CDE#PBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and sensor fusion systems requiring stable component supply, long-term lifecycle support, and guaranteed C-grade temperature performance (0°C to 70°C).
Supply support for LTC2492CDE#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 LTC2492CDE#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for high-accuracy, low-power, multi-channel sensor digitization in harsh electromagnetic environments - emphasizing ease of use, robustness, and system-level integration.
FAQ
What is the operating temperature range for the LTC2492CDE#PBF?
The LTC2492CDE#PBF is specified for the commercial temperature range of 0°C to 70°C. This grade is validated per the Absolute Maximum Ratings table in the LTC2492 datasheet (Rev. FE), with all key specifications - including INL, offset error, and noise - guaranteed over this range. For extended operation, the LTC2492IDE#PBF (–40°C to 85°C) is the industrial-grade variant.
Does the LTC2492CDE#PBF require external components for basic operation?
Yes - the LTC2492CDE#PBF requires a minimum 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor on the VCC pin, as specified in the "Typical Application" schematic (Figure TA01a). Additionally, a 0.1 µF capacitor is recommended between REF+ and REF– for stable reference decoupling. No external op-amps or buffers are needed due to its Easy Drive input architecture.
How does the Easy Drive technology in the LTC2492CDE#PBF improve measurement accuracy?
Easy Drive technology in the LTC2492CDE#PBF automatically cancels differential input current during sampling, eliminating dynamic errors caused by source impedance imbalance. This allows direct connection of high-impedance sensors (e.g., pH probes, thermistors) without external buffers, preserving DC accuracy and reducing system-level drift - confirmed by <2 ppm INL and ±0.5 µV offset error over temperature.
Can the LTC2492CDE#PBF measure its own die temperature?
Yes - the LTC2492CDE#PBF integrates a calibrated PTAT temperature sensor with 1/30°C resolution and ±2°C absolute accuracy. When configured via SDI command to read the internal sensor, it outputs temperature data alongside standard ADC conversions, enabling real-time thermal compensation of sensor readings without external components.
What are the power consumption characteristics of the LTC2492CDE#PBF in different operating modes?
In 1× speed mode (7.5 Hz output), the LTC2492CDE#PBF draws 80 µA (typ) from a 5V supply; in 2× speed mode (15 Hz), it draws 160 µA (typ). Sleep current is 1 µA (max) when CS is HIGH. Total power is 0.8 mW at 5V in active 1× mode - verified in the "Power Requirements" section of the datasheet under normal-speed conditions.
LTC2492CDE#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 24
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Single Ended
- 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:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 14-DFN (4x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2492CDE#PBF FAQ
1.How can I place an order for LTC2492CDE#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2492CDE#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 LTC2492CDE#PBF reliable?
The price and inventory of LTC2492CDE#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2492CDE#PBF is usually 5 days.
3.What payment methods are accepted for LTC2492CDE#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2492CDE#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2492CDE#PBF?
LTC2492CDE#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2492CDE#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 LTC2492CDE#PBF?
For technical support, including LTC2492CDE#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2492CDE#PBF requirements.
6.How does Aetrix verify that LTC2492CDE#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2492CDE#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 LTC2492CDE#PBF meets industry standards.
7.What is the process for return or replacement of LTC2492CDE#PBF?
All LTC2492CDE#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2492CDE#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 LTC2492CDE#PBF part is unused and in its original packaging.
Return procedure for LTC2492CDE#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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