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Analog Devices Inc. LTC2494IUHF#TRPBF
- Part No.:
- LTC2494IUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2494IUHF#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:325
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Product details
Overview
LTC2494IUHF#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 precision industrial data acquisition systems requiring rail-to-rail input digitization of high-impedance sensors.
For engineers reviewing the LTC2494IUHF#TRPBF datasheet, LTC2494IUHF#TRPBF pinout, LTC2494IUHF#TRPBF application, or LTC2494IUHF#TRPBF equivalent, key selection criteria include its programmable gain (1–256), simultaneous 50Hz/60Hz rejection, no-latency digital filter, integrated oscillator, and –40°C to +85°C industrial temperature grade.
Technical Context
The LTC2494IUHF#TRPBF employs a 3rd-order delta-sigma modulator with decimating FIR filtering and auto-calibration to achieve 16-bit resolution without missing codes. Its patented Easy Drive sampling scheme cancels differential input current dynamically, enabling direct digitization of rail-to-rail signals with source impedances up to 100kΩ while preserving DC accuracy.
It features dual-speed operation (1x/2x), configurable line-frequency rejection (50Hz, 60Hz, or simultaneous), and a 4-wire SPI-compatible interface with internal or external clock control. The device integrates a PTAT-based temperature sensor with ±2°C absolute accuracy and 0.5°C resolution, usable as a system diagnostic or compensation reference.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonic transfer function for precise linear measurements. |
| INL | 2 ppm of VREF - enables sub-μV-level linearity error in 5V full-scale systems. |
| Offset Error | ±0.5 µV typical - eliminates need for system-level offset trimming in high-precision sensor interfaces. |
| RMS Noise | 0.6 µV RMS - supports 19.5 effective number of bits (ENOB) at 7.5 SPS in low-noise configurations. |
| Input Range | GND to VCC common-mode - allows direct connection of unbuffered sensors operating at rail voltages. |
| Gain Range | Programmable 1× to 256× in 8 discrete steps - matches signal amplitude to ADC full-scale without external amplification. |
| Temp Sensor Accuracy | ±2°C absolute, 0.5°C resolution - provides reliable board-level thermal monitoring without external components. |
| Power Consumption | 160 µA typical conversion current, 1 µA sleep - enables battery-powered or energy-constrained embedded DAQ designs. |
Pinout & Package
The LTC2494IUHF#TRPBF is housed in a 38-lead, 5mm × 7mm plastic QFN package with exposed pad (Pin 39 = GND). All eight ground pins (Pins 1, 3–6, 31–33) must be soldered to a low-impedance PCB ground plane for optimal noise immunity and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,3–6,31–33) | Ground reference | Multiple dedicated ground paths minimize return current coupling and improve PSRR. |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 16 single-ended or 8 differential inputs; support rail-to-rail common-mode range. |
| COM (Pin 7) | Common negative input | Serves as shared IN– for all single-ended channels; extends input flexibility without external switches. |
| MUXOUTP/N (Pins 24,27) | Multiplexer outputs | Enable external buffering or direct connection to ADC inputs-supports isolated signal conditioning. |
| ADCINP/N (Pins 25,26) | ADC analog inputs | Differential inputs to sigma-delta modulator; optimized for low charge injection and high CMRR. |
| REF+/REF– (Pins 29,30) | Differential reference | Set full-scale range independently of supply; allow ratiometric or absolute reference configurations. |
| SDI/SDO/SCK/CS (Pins 34,37,38,36) | 4-wire SPI interface | Supports both internal and external clock modes; CS-controlled wake/sleep reduces idle power by >100×. |
| fO (Pin 35) | Oscillator control | Selects internal 307.2kHz clock or external frequency source to tune output rate and notch rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive Input Current Cancellation | Eliminates dynamic input bias current errors - enables direct digitization of high-impedance thermistors, RTDs, and bridge sensors without buffer op-amps. |
| No-Latency Digital Filter | Settles in one conversion cycle after channel change - ensures first-result validity for multiplexed scanning applications. |
| Simultaneous 50Hz/60Hz Rejection | Rejects both mains frequencies in a single measurement - critical for global industrial equipment deployed across AC grid standards. |
| Integrated Temperature Sensor | On-die PTAT sensor with ±2°C accuracy - provides real-time die temperature for calibration compensation or thermal safety monitoring. |
| 2x Speed Mode | Doubles output data rate to 15 SPS with 128× max gain - balances speed and resolution for responsive process control loops. |
| Wide Common-Mode Input Range | 0V to VCC independent of reference voltage - simplifies front-end design for sensors with floating or rail-referenced outputs. |
Applications
| Industrial Process Monitoring | High-Impedance Sensor Digitization |
|---|---|
Use Scenario: Continuous monitoring of pressure, flow, and level transmitters in chemical plants using 4–20mA loop-powered sensors with local signal conditioning. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple analog sensor outputs with simultaneous 50/60Hz rejection to suppress EMI from variable-frequency drives and lighting ballasts. Use Value: Eliminates need for external anti-aliasing filters and instrumentation amplifiers, reducing BOM count and layout area while maintaining ±0.005% measurement accuracy. | Use Scenario: Direct digitization of unbuffered thermistor networks and strain-gauge bridges in portable test equipment with limited PCB space and power budget. IC Role / Device Role / Timing Role: Rail-to-rail input ADC with Easy Drive technology serving as front-end digitizer for high-Z sources, configured in differential mode with 64× gain. Use Value: Achieves <1µV offset drift over temperature without external trimming, enabling factory-calibration-free operation across –40°C to +85°C. |
| Multi-Channel Data Loggers | Temperature-Compensated Instrumentation |
Use Scenario: Battery-powered environmental data loggers capturing temperature, humidity, and air quality metrics over weeks using low-power microcontrollers. IC Role / Device Role / Timing Role: Low-quiescent-current ADC managing 12 sensor inputs via internal MUX, entering 1µA sleep between 10-second conversions. Use Value: Extends battery life beyond 12 months on two AA cells while delivering 16-bit resolution and built-in temperature reference for sensor linearization. | Use Scenario: Precision digital multimeters and calibrators requiring traceable voltage/current measurements with thermal drift correction. IC Role / Device Role / Timing Role: Dual-function ADC measuring both DUT signals and its own die temperature to apply real-time gain/offset compensation algorithms. Use Value: Reduces total unadjusted error from 15 ppm to <5 ppm over full temperature range, meeting Class A handheld meter specifications. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel delta-sigma ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPBSR | 24-bit resolution, 4kSPS max, integrated PGA and burnout current sources; requires external reference; no on-chip temp sensor. | Better resolution and speed for high-end metrology; lacks integrated temp sensor for self-compensation. | Choose when 24-bit resolution and faster scan rates outweigh need for integrated temperature sensing and lower power. |
| MAX11206ETN+ | 24-bit resolution, 1kSPS max, internal oscillator only, fixed 1x/2x/4x gain; no simultaneous 50/60Hz rejection; smaller 20-pin TQFN. | Lower pin count and cost for simpler 8-channel systems; lacks flexible line-frequency rejection and programmable gain steps. | Choose for compact, cost-sensitive designs where simultaneous 50/60Hz rejection and wide gain range are not required. |
Compared with ADS124S08IPBSR and MAX11206ETN+, the LTC2494IUHF#TRPBF uniquely combines 16-bit precision, integrated temperature sensing, simultaneous 50/60Hz rejection, and Easy Drive technology in a single 38-pin QFN-making it optimal for industrial DAQ systems needing robustness, low component count, and thermal-aware measurement without external calibration hardware.
Availability
LTC2494IUHF#TRPBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, multi-channel data loggers, and temperature-compensated sensor interfaces requiring stable component supply across extended temperature ranges.
Supply support for LTC2494IUHF#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2494IUHF#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for low-power, high-accuracy multichannel data acquisition in harsh industrial environments where reliability, noise immunity, and thermal stability are critical.
FAQ
What is the operating temperature range of the LTC2494IUHF#TRPBF?
The LTC2494IUHF#TRPBF is rated for industrial operation from –40°C to +85°C. This temperature grade is confirmed by the "I" suffix in the part number and specified in the Absolute Maximum Ratings table. The device maintains full performance-including 2ppm INL, 0.5µV offset, and 600nV RMS noise-across this entire range, making it suitable for deployment in factory automation, outdoor monitoring, and motor control applications.
Does the LTC2494IUHF#TRPBF require an external reference voltage?
No, the LTC2494IUHF#TRPBF does not require an external reference voltage-it can operate with an internal reference derived from VCC or accept an external differential reference applied to REF+ and REF– pins. The reference voltage range is 0.1V to VCC, and the device supports ratiometric or absolute measurement modes. When using the internal temperature sensor, a minimum 2V reference is required.
How does the Easy Drive technology in the LTC2494IUHF#TRPBF benefit high-impedance sensor interfaces?
The Easy Drive technology in the LTC2494IUHF#TRPBF cancels differential input current dynamically during sampling, eliminating the need for external op-amp buffers when interfacing with high-impedance sensors such as thermistors, RTDs, and piezoresistive bridges. This reduces system cost, board area, and potential error sources like amplifier offset drift and noise-while preserving DC accuracy and enabling true rail-to-rail input operation.
Can the LTC2494IUHF#TRPBF perform simultaneous 50Hz and 60Hz line-frequency rejection?
Yes, the LTC2494IUHF#TRPBF supports a dedicated simultaneous 50Hz/60Hz rejection mode. When enabled, its digital filter places nulls at both frequencies, allowing accurate measurements in globally deployed equipment subject to varying AC power standards-such as export-grade PLC modules or universal test instruments used across North America, Europe, and Asia.
What is the pin configuration and package type of the LTC2494IUHF#TRPBF?
The LTC2494IUHF#TRPBF uses a 38-lead plastic QFN package measuring 5mm × 7mm with an exposed thermal pad (Pin 39). It features eight dedicated ground pins (Pins 1, 3–6, 31–33), 16 analog input pins (CH0–CH15, Pins 8–23), and a full 4-wire SPI interface (CS, SDI, SDO, SCK). The exposed pad must be soldered to the PCB ground plane for proper thermal dissipation and electrical performance.
LTC2494IUHF#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2494IUHF#TRPBF FAQ
1.How can I place an order for LTC2494IUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2494IUHF#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 LTC2494IUHF#TRPBF reliable?
The price and inventory of LTC2494IUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2494IUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2494IUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2494IUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2494IUHF#TRPBF?
LTC2494IUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2494IUHF#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 LTC2494IUHF#TRPBF?
For technical support, including LTC2494IUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2494IUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2494IUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2494IUHF#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 LTC2494IUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2494IUHF#TRPBF?
All LTC2494IUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2494IUHF#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 LTC2494IUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2494IUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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