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Analog Devices Inc. LTC2494CUHF#TRPBF
- Part No.:
- LTC2494CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2494CUHF#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,914
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Product details
Overview
LTC2494CUHF#TRPBF from Analog Devices (formerly Linear Technology) is a 16-bit, 16-channel delta-sigma ADC with integrated PGA, Easy Drive input current cancellation, and on-chip temperature sensor. It supports up to 8 differential or 16 single-ended inputs, delivers 600nV RMS noise, 2ppm INL, and operates from 2.7V to 5.5V supply. It is used in high-accuracy industrial data acquisition systems requiring rail-to-rail input digitization of high-impedance sensors.
For engineers reviewing the LTC2494CUHF#TRPBF datasheet, LTC2494CUHF#TRPBF pinout, LTC2494CUHF#TRPBF application, or LTC2494CUHF#TRPBF equivalent, key selection criteria include its programmable gain (1–256), simultaneous 50Hz/60Hz rejection, no-latency digital filter settling, internal oscillator, and 38-pin QFN package with exposed thermal pad.
Technical Context
The LTC2494CUHF#TRPBF employs a 3rd-order delta-sigma modulator with decimating FIR filtering and auto-calibration circuitry to achieve 16-bit resolution without missing codes. Its Easy Drive architecture cancels differential input current dynamically, enabling direct digitization of rail-to-rail signals with source impedances up to 100kΩ while maintaining DC accuracy.
It features dual-speed operation (1x/2x mode), selectable line-frequency rejection (50Hz, 60Hz, or simultaneous), and configurable SPI-compatible 4-wire serial interface with internal or external clocking. The integrated temperature sensor provides 0.5°C resolution and ±2°C absolute accuracy over 0°C to 70°C ambient range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit, no missing codes - guarantees monotonic transfer function for precision measurement integrity. |
| INL | 2 ppm of VREF - enables sub-μV-level linearity error in 5V full-scale systems. | Offset Error | ±0.5 µV typical - supports ultra-low-offset applications such as strain gauge or thermocouple front-ends. |
| RMS Noise | 0.6 µV RMS - allows detection of sub-microvolt signal changes in low-noise instrumentation. |
| Programmable Gain | 1 to 256 in 8 steps - matches full-scale ranges from mV to V-level inputs without external amplification. |
| Common Mode Range | GND to VCC - permits direct connection to sensors operating at any voltage within supply rails. |
| Supply Voltage | 2.7V to 5.5V - supports battery-powered and industrial 3.3V/5V systems without level-shifting. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed thermal pad (Pin 39 = GND). Requires soldering of exposed pad to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,3,4,5,6,31,32,33) | Ground reference | Eight dedicated ground pins minimize ground bounce and improve PSRR; all must connect to low-impedance ground plane. |
| COM (Pin 7) | Common negative input | Serves as IN– for all single-ended channels; supports rail-to-rail common-mode voltage (GND to VCC). |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 16 single-ended or 8 differential inputs; each pair accepts bipolar differential input up to ±0.5·VREF/Gain. |
| MUXOUTP/N (Pins 24,27) | Multiplexer outputs | Drive external buffers or connect directly to ADC inputs; enable isolation of sensitive analog front-end from switching noise. |
| ADCINP/N (Pins 25,26) | ADC input terminals | Differential inputs to ΔΣ modulator; optimized for low charge injection and minimal sampling distortion. |
| VCC (Pin 28) | Positive supply | Requires local 10µF tantalum + 0.1µF ceramic bypassing; supports wide 2.7V–5.5V operation. |
| REF+/REF– (Pins 29,30) | Differential reference | Set full-scale range independently of supply; VREF = REF+ – REF– must be ≥0.1V and ≤VCC. |
| SDI/SDO/SCK/CS/fO (Pins 34–38) | 4-wire SPI interface | Supports internal/external clocking; CS wake-up triggers conversion; fO selects 307.2kHz internal oscillator or external clock. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive input current cancellation | Eliminates dynamic input current errors, enabling direct digitization of high-impedance sensors (e.g., RTDs, thermistors) without external buffering. |
| No-latency digital filter | Settles in one conversion cycle after channel change - critical for multiplexed scanning in real-time control loops. |
| Simultaneous 50Hz/60Hz rejection | Rejects both power-line frequencies in a single conversion, simplifying EMI mitigation in global industrial deployments. |
| Integrated temperature sensor | Provides on-chip die temperature monitoring with ±2°C absolute accuracy - useful for self-compensation and thermal diagnostics. |
| 2x Speed / Reduced Power mode | Delivers 15Hz output rate with 80µA supply current (at 7.5Hz), optimizing trade-off between throughput and battery life. |
Applications
| Industrial Process Monitoring | High-Impedance Sensor Digitization |
|---|---|
Use Scenario: Continuous monitoring of pressure transducers and load cells in factory automation PLCs. IC Role / Device Role / Timing Role: Primary ADC digitizing 8 differential sensor channels with simultaneous 50/60Hz noise rejection. Use Value: Eliminates need for external anti-aliasing filters and op-amp buffers, reducing BOM count and layout area by >30%. | Use Scenario: Direct digitization of thermistor networks and RTD bridges in HVAC environmental controllers. IC Role / Device Role / Timing Role: Rail-to-rail input ADC with zero differential input current, interfacing directly to kΩ-range sensors. Use Value: Maintains 16-bit accuracy without gain drift or offset shift caused by sensor-source impedance mismatch. |
| Portable Precision Instrumentation | Temperature-Compensated Data Acquisition |
Use Scenario: Handheld multimeters and calibration standards requiring low-power, high-accuracy DC measurements. IC Role / Device Role / Timing Role: Low-noise (0.6µV RMS), low-quiescent-current (160µA) ADC with internal oscillator and sleep mode. Use Value: Enables >100-hour battery life at 7.5Hz output rate while preserving sub-µV measurement fidelity. | Use Scenario: Strain-gauge-based structural health monitoring where temperature-induced drift must be corrected in real time. IC Role / Device Role / Timing Role: Simultaneously acquires sensor voltage and on-die temperature for per-sample compensation. Use Value: Reduces thermal drift error by >90% compared to external temperature sensing, using correlated on-chip readings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPBS | 24-bit resolution, 4-channel, integrated PGA and burnout current; no on-chip temperature sensor; SPI interface only. | Higher resolution but fewer channels; lacks simultaneous 50/60Hz rejection and Easy Drive architecture. | Select when 24-bit precision outweighs channel count and line-rejection requirements. |
| MAX11206ETL+ | 24-bit resolution, 8-channel, internal oscillator, 50/60Hz rejection; no programmable gain; 0.5µV RMS noise. | Lower channel count (8 vs 16), no PGA, higher noise floor; requires external gain stages for mV-level signals. | Select when ultra-low noise is prioritized over gain flexibility and multi-sensor scalability. |
Compared with ADS124S08IPBS and MAX11206ETL+, the LTC2494CUHF#TRPBF uniquely combines 16-channel count, programmable gain, Easy Drive input cancellation, and simultaneous 50/60Hz rejection in a single 5×7mm QFN - making it optimal for space-constrained, multi-sensor industrial DAQ systems needing robust AC-line immunity.
Availability
LTC2494CUHF#TRPBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and temperature-compensated sensor systems requiring stable component supply across extended production lifecycles.
Supply support for LTC2494CUHF#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing technologies.
The LTC2494CUHF#TRPBF belongs to Linear's No Latency Delta-Sigma ADC product line, designed specifically for high-accuracy, low-power, multi-channel data acquisition in harsh industrial and portable environments.
FAQ
What is the operating temperature range for the LTC2494CUHF#TRPBF?
The LTC2494CUHF#TRPBF 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. The device uses an internal temperature sensor with ±2°C absolute accuracy across this range, and its key specifications-including INL, offset error, and noise-are guaranteed over the full 0°C to 70°C span.
Does the LTC2494CUHF#TRPBF support simultaneous 50Hz and 60Hz line-frequency rejection?
Yes, the LTC2494CUHF#TRPBF supports simultaneous 50Hz/60Hz rejection mode, which is explicitly listed under Features and Converter Characteristics. In this mode, the digital filter nulls both frequencies in a single conversion cycle (tCONV_1 = 144.1–149.9 ms depending on VCC/VREF), eliminating the need for software-based dual-frequency filtering or hardware notch circuits.
How does the Easy Drive technology in the LTC2494CUHF#TRPBF improve high-impedance sensor interfacing?
The Easy Drive technology in the LTC2494CUHF#TRPBF automatically cancels differential input current during sampling, removing dynamic errors that would otherwise distort readings from high-impedance sources (e.g., >10kΩ thermistors or pH electrodes). This allows direct connection without external op-amp buffers while preserving DC accuracy-verified by <2ppm INL and ±0.5µV offset error over temperature.
What is the pin configuration and package type of the LTC2494CUHF#TRPBF?
The LTC2494CUHF#TRPBF uses a 38-lead plastic QFN package measuring 5mm × 7mm with an exposed thermal pad (Pin 39 = GND). Pin functions include 16 analog inputs (CH0–CH15), COM, MUXOUTP/N, ADCINP/N, REF+/REF–, VCC, GND (8 pins), and 4-wire SPI interface (CS, SDI, SDO, SCK) plus fO. All GND pins must be connected to a low-impedance ground plane.
Can the LTC2494CUHF#TRPBF measure its own die temperature?
Yes, the LTC2494CUHF#TRPBF integrates a high-accuracy PTAT temperature sensor with 0.5°C resolution and ±2°C absolute accuracy over 0°C to 70°C. It can be selected via command register configuration, and its output is digitized alongside analog inputs-enabling real-time thermal compensation of sensor readings without external components.
LTC2494CUHF#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 15
- Number of Inputs:
- 8, 16
- 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:
- PGA, Temperature Sensor
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2494CUHF#TRPBF FAQ
1.How can I place an order for LTC2494CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2494CUHF#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 LTC2494CUHF#TRPBF reliable?
The price and inventory of LTC2494CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2494CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2494CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2494CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2494CUHF#TRPBF?
LTC2494CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2494CUHF#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 LTC2494CUHF#TRPBF?
For technical support, including LTC2494CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2494CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2494CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2494CUHF#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 LTC2494CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2494CUHF#TRPBF?
All LTC2494CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2494CUHF#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 LTC2494CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2494CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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