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Analog Devices Inc. LTC2492CDE#TRPBF
- Part No.:
- LTC2492CDE#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 14-WFDFN Exposed Pad
- Datasheet:
-
LTC2492CDE#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,941
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Product details
Overview
LTC2492CDE#TRPBF 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 0.6µVRMS noise, 2ppm INL, and 1ppm 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#TRPBF datasheet, LTC2492CDE#TRPBF pinout, LTC2492CDE#TRPBF application, or LTC2492CDE#TRPBF equivalent, key selection criteria include its No Latency ∆Σ architecture, 0°C to 70°C operating range, 14-lead DFN package, integrated oscillator, and support for both internal/external clocking - critical for precision DC measurement systems requiring simultaneous line-frequency rejection and temperature compensation.
Technical Context
The LTC2492CDE#TRPBF employs a 3rd-order delta-sigma modulator with decimating FIR filter and auto-calibration, achieving single-cycle digital settling ("No Latency") even after channel changes. Its patented Easy Drive sampling scheme cancels differential input current, eliminating errors from external source impedance up to hundreds of kΩ.
It supports dual-speed operation (1×/2×), configurable 50Hz/60Hz/simultaneous 50Hz+60Hz rejection via fO pin or serial command, and offers GND-to-VCC common-mode input range independent of reference voltage - enabling direct interfacing with unbuffered sensors, thermocouples, and bridge transducers without signal conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full dynamic range utilization for high-fidelity sensor data acquisition. |
| INL | 2 ppm of VREF - ensures ±0.0002% linearity error across full scale, critical for calibration-grade measurements. |
| Offset Error | 0.5 µV typical - enables sub-microvolt DC offset correction in strain gauge or thermopile interfaces. |
| Output Noise | 0.6 µVRMS (1× speed) - supports 20.5+ ENOB at 7.5 SPS, suitable for ultra-low-noise weigh scales and precision RTD readouts. |
| Temp Sensor Accuracy | ±2°C absolute, 1/30°C resolution - provides on-chip reference for self-compensated analog front-ends without external sensors. |
| Supply Current | 160 µA typical (1× speed, 7.5 SPS) - enables battery-powered portable instrumentation with multi-year runtime. |
| Common-Mode Range | GND to VCC - allows direct digitization of signals referenced to non-ground potentials, e.g., floating bridge outputs or current-sense shunts. |
Pinout & Package
Package: 14-lead (4mm × 3mm) plastic DFN with exposed pad (Pin 15 = GND). RoHS-compliant, lead-free finish, tape-and-reel packaging (TRPBF).
| 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, speed mode, line rejection, and temperature measurement via SPI-compatible command stream. |
| SCK (Pin 3) | Bidirectional clock I/O | Functions as output (internal SCK mode) or input (external SCK mode); defines timing for 32-bit data transfer and command loading. |
| CS (Pin 4) | Active-low chip select | Wakes ADC from sleep (LOW), initiates data transfer, and aborts ongoing transfer if raised mid-cycle. |
| SDO (Pin 5) | Three-state serial data output | Outputs conversion result (32-bit) and serves as conversion status flag (HIGH = busy, LOW = ready) when CS is asserted. |
| GND (Pin 6) | Analog/digital ground | Primary reference node; must connect to low-impedance PCB ground plane to maintain noise performance. |
| COM (Pin 7) | Common negative input | Shared IN– for all single-ended channels; supports rail-to-rail common-mode voltages (GND – 0.3V to VCC + 0.3V). |
| CH0–CH3 (Pins 8–11) | Configurable analog inputs | Support single-ended or differential pair selection (CH0/CH1, CH2/CH3); each accepts full-scale differential input of ±0.5·VREF. |
| VCC (Pin 12) | Positive supply | 2.7V to 5.5V operation; requires local 10µF tantalum + 0.1µF ceramic bypassing for stable conversion performance. |
| REF+ / REF– (Pins 13–14) | Differential reference inputs | Set full-scale range (VREF = REF+ – REF–); accept common-mode range from GND to VCC, enabling ratiometric or independent reference configurations. |
| Exposed Pad (Pin 15) | Thermal & electrical ground | Must be soldered to PCB ground plane for thermal dissipation and optimal EMI immunity; not optional. |
Key Features
| Feature | Design Value |
|---|---|
| No Latency ∆Σ architecture | Digital filter settles in one conversion cycle - eliminates settling delay after channel or configuration changes, enabling true multiplexed DC accuracy. |
| Easy Drive input current cancellation | Zero net differential input current - permits direct connection to high-impedance sources (e.g., pH electrodes, piezoresistive sensors) without buffer amplifiers or accuracy degradation. |
| Programmable line-frequency rejection | Hardware-selectable 50Hz, 60Hz, or simultaneous 50Hz/60Hz notch filtering - suppresses mains interference without firmware-based DSP overhead. |
| Integrated temperature sensor | On-die PTAT element with 1/30°C resolution - enables real-time thermal drift compensation of external signal chains or self-test functionality. |
| 2× speed mode | Doubles output rate to 15 SPS while maintaining 0.85µVRMS noise - balances speed and resolution for responsive industrial HMI or closed-loop control feedback. |
Applications
| High-Precision Weigh Scale | Industrial Temperature Monitoring |
|---|---|
Use Scenario: Digitizing mV-level output from load cell bridges in platform scales and hopper weighing systems. IC Role / Device Role / Timing Role: Primary 24-bit ADC with integrated line rejection and zero-drift input stage, replacing discrete instrumentation amplifier + ADC solutions. Use Value: Eliminates external op-amp buffering and 50/60Hz notch filters, reducing BOM count by ≥3 components while maintaining ±0.001% weighing accuracy over temperature. | Use Scenario: Simultaneous measurement of RTD resistance and ambient temperature in PLC analog input modules. IC Role / Device Role / Timing Role: Dual-role ADC: digitizes 4-wire RTD voltage drop and reads on-chip temperature sensor for cold-junction compensation. Use Value: Enables ratiometric RTD measurement with built-in thermal reference, removing need for external temperature sensor and associated calibration coefficients. |
| Portable Battery-Powered DMM | Medical Sensor Interface |
Use Scenario: High-resolution DC voltage/current measurement in handheld multimeters with >6½-digit display capability. IC Role / Device Role / Timing Role: Core metrology ADC with ultra-low offset drift and 0.6µVRMS noise, operating from coin-cell supply. Use Value: Achieves 100nV resolution at 7.5 SPS with only 160µA supply current, extending battery life beyond 1,000 hours per charge. | Use Scenario: Low-noise acquisition of biopotential signals (ECG, EEG) from dry electrodes with high source impedance. IC Role / Device Role / Timing Role: Front-end ADC with rail-to-rail input and zero differential current, directly interfacing unbuffered electrode nodes. Use Value: Removes input bias current errors that cause baseline drift in high-Z biopotential paths, improving diagnostic signal fidelity without active guarding. |
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, 7-channel, integrated PGA and burn-out current sources; no on-chip temperature sensor; SPI interface with CRC. | Better suited for multi-sensor systems requiring programmable gain and sensor diagnostics; lacks integrated line rejection hardware. | Select when PGA flexibility and sensor excitation are required; avoid if 50/60Hz rejection must be handled in hardware without MCU intervention. |
| MAX11206ETL+ | 24-bit, 2-channel, 1.4µVRMS noise, 1.8–3.6V supply; no integrated temp sensor; smaller 12-pin TQFN. | Optimized for ultra-low-voltage, space-constrained designs; higher noise limits use in sub-10µV applications. | Select for battery-powered IoT nodes where size and 1.8V compatibility outweigh need for line rejection and on-die temperature sensing. |
Compared with ADS124S08IPWR and MAX11206ETL+, the LTC2492CDE#TRPBF uniquely combines hardware-based 50/60Hz rejection, zero-differential-input-current architecture, and integrated temperature sensing in a single 4mm × 3mm DFN - making it the optimal choice for cost-sensitive, high-accuracy industrial sensor nodes where external filtering, buffering, and thermal compensation would otherwise increase design complexity and error budget.
Availability
LTC2492CDE#TRPBF is available at Aetrix Electronics and suitable for industrial process control, precision instrumentation, and medical sensor interface applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LTC2492CDE#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 LTC2492CDE#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for high-resolution DC measurement systems where low noise, zero input current, and robust line-frequency immunity are mandatory - not optional - for metrology-grade accuracy.
FAQ
What is the operating temperature range of the LTC2492CDE#TRPBF?
The LTC2492CDE#TRPBF is rated for 0°C to 70°C operation (Commercial grade). This is confirmed by the "C" suffix in the part number and specified in the Absolute Maximum Ratings table. It is distinct from the "I" grade (–40°C to 85°C) version LTC2492IDE#TRPBF, and thermal performance parameters (e.g., offset drift, noise) are guaranteed within this 0°C–70°C range.
Does the LTC2492CDE#TRPBF require an external reference voltage?
No - the LTC2492CDE#TRPBF accepts an external differential reference (REF+ and REF–), but it does not require one. It can operate ratiometrically using the same supply (VCC) as reference, or with dedicated precision references. The reference voltage range is 0.1V to VCC, and minimum REF is 2V for on-chip temperature measurements. Internal reference generation is not supported.
How does the Easy Drive technology in the LTC2492CDE#TRPBF eliminate input current errors?
The LTC2492CDE#TRPBF uses a patented sampling scheme that automatically cancels differential input current through correlated double sampling and charge redistribution. This results in net zero differential input current - verified by <10nA typical leakage - allowing direct connection to high-impedance sources like thermistors or pH probes without accuracy loss due to IR drops.
Can the LTC2492CDE#TRPBF measure its own die temperature?
Yes - the LTC2492CDE#TRPBF integrates a PTAT (Proportional To Absolute Temperature) sensor with 1/30°C resolution and ±2°C absolute accuracy. When configured via SDI command, it replaces analog input conversion with internal temperature measurement, outputting a calibrated 24-bit code representing junction temperature - useful for thermal compensation and system health monitoring.
What is the minimum required external capacitance on the VCC pin for stable operation of the LTC2492CDE#TRPBF?
The LTC2492CDE#TRPBF requires a minimum 10µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor directly at the VCC pin, as specified in the Typical Application circuit (Figure TA01a). This dual-capacitor network ensures low-impedance supply decoupling across both low and high frequencies, preventing conversion errors caused by supply ripple or transient droop during internal calibration cycles.
LTC2492CDE#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 14-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- 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#TRPBF FAQ
1.How can I place an order for LTC2492CDE#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2492CDE#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 LTC2492CDE#TRPBF reliable?
The price and inventory of LTC2492CDE#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2492CDE#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2492CDE#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2492CDE#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2492CDE#TRPBF?
LTC2492CDE#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2492CDE#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 LTC2492CDE#TRPBF?
For technical support, including LTC2492CDE#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2492CDE#TRPBF requirements.
6.How does Aetrix verify that LTC2492CDE#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2492CDE#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 LTC2492CDE#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2492CDE#TRPBF?
All LTC2492CDE#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2492CDE#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 LTC2492CDE#TRPBF part is unused and in its original packaging.
Return procedure for LTC2492CDE#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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