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Analog Devices Inc. LTC2494IUHF#PBF
- Part No.:
- LTC2494IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2494IUHF#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:167
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Product details
Overview
LTC2494IUHF#PBF 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 delivers 2 ppm INL, 1 µV offset error, 600 nV RMS noise, and programmable gain (1–256) for high-accuracy sensor digitization in industrial process control systems.
For engineers reviewing the LTC2494IUHF#PBF datasheet, LTC2494IUHF#PBF pinout, LTC2494IUHF#PBF application, or LTC2494IUHF#PBF equivalent, key selection criteria include rail-to-rail input support with zero differential input current, simultaneous 50/60 Hz rejection, internal oscillator operation, and QFN-38 package compatibility with high-impedance sensor interfaces.
Technical Context
The LTC2494IUHF#PBF implements a 3rd-order delta-sigma modulator with decimating FIR filter and auto-calibration engine, enabling single-cycle digital settling after channel change. Its Easy Drive architecture cancels dynamic input current via patented sampling, eliminating buffering requirements for rail-to-rail signals across 0 V to VCC common-mode range.
It supports dual-speed modes (1x/2x), programmable line-frequency rejection (50 Hz / 60 Hz / simultaneous), and configurable SPI interface with internal or external clocking. The integrated PTAT temperature sensor provides 0.5°C resolution and ±2°C absolute accuracy, directly accessible via channel selection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage over full-scale input range. |
| INL | 2 ppm of VREF - enables sub-µV-level precision in high-gain sensor measurements. |
| Offset Error | ±0.5 µV (typ) - eliminates need for system-level offset calibration in precision instrumentation. |
| RMS Noise | 0.6 µV (1x speed) - supports 19.5+ ENOB at low output data rates for ultra-low-noise applications. |
| Input Common-Mode Range | 0 V to VCC - allows direct digitization of rail-to-rail signals without level-shifting circuitry. |
| Programmable Gain | 1 to 256 in 8 steps - matches full-scale range to sensor output (e.g., thermocouples, strain gauges, RTDs). |
| Line Rejection | Simultaneous 50 Hz/60 Hz - suppresses mains interference in global industrial deployments without software filtering. |
| Supply Voltage | 2.7 V to 5.5 V - operates from single Li-ion cell or standard 3.3 V/5 V rails with no LDO required. |
Pinout & Package
Package: 38-lead (5 mm × 7 mm) plastic QFN with exposed pad (Pin 39 = GND). Requires soldering 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 16 single-ended channels; supports bipolar input range relative to COM voltage. |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 8 differential or 16 single-ended inputs; each accepts 0 V to VCC common-mode voltage. |
| MUXOUTP/N (Pins 24,27) | Multiplexer outputs | Drive external buffers or connect directly to ADC inputs; enable high-Z signal routing before ADC front-end. |
| ADCINP/N (Pins 25,26) | ADC analog inputs | Differential inputs to ΔΣ modulator; internally biased for optimal noise and linearity performance. |
| VCC (Pin 28) | Power supply | Requires 10 µF tantalum + 0.1 µF ceramic bypass close to pin for stable conversion under dynamic load. |
| REF+/REF– (Pins 29,30) | Differential reference | Set full-scale range (±0.5·VREF/Gain); REF+ must exceed REF– by ≥0.1 V; min VREF = 2 V for temp sensing. |
| SDI/SDO/SCK/CS/fO (Pins 34–38) | 4-wire SPI interface | Supports internal/external clocking; CS LOW wakes device; SDO indicates conversion status during sleep. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive input current cancellation | Eliminates dynamic input current errors, enabling direct digitization of high-impedance sources (>1 MΩ) without external buffers. |
| No latency digital filter | First conversion after channel or mode change is valid - no settling delay, critical for multiplexed sensor arrays. |
| Integrated temperature sensor | Delivers ±2°C absolute accuracy and 0.5°C resolution without calibration; accessed as dedicated channel with same timing as analog inputs. |
| 2x Speed Mode | Doubles output data rate (e.g., 15 Hz → 30 Hz) while maintaining 16-bit resolution and 1 ppm offset error. |
| Reduced power sleep mode | Consumes only 1 µA (typ) when CS HIGH - extends battery life in portable data loggers and remote sensors. |
| Flexible reference common-mode | REF+/REF– accept 0.1 V to VCC differential range with GND-to-VCC common-mode - simplifies reference design with ratiometric or buffered references. |
Applications
| Industrial Process Monitoring | High-Impedance Sensor Digitization |
|---|---|
Use Scenario: Continuous monitoring of pressure, flow, and level transmitters in chemical plants with 4–20 mA loop-powered sensors and local signal conditioning. IC Role / Device Role / Timing Role: Primary ADC digitizing up to 16 analog inputs per node; performs simultaneous 50/60 Hz rejection to eliminate mains-coupled noise in factory environments. Use Value: Eliminates external anti-aliasing filters and op-amp buffers, reducing BOM count and board area while maintaining ±0.005% full-scale accuracy over –40°C to +85°C. | Use Scenario: Direct digitization of thermocouples, RTDs, and piezoresistive sensors in portable test equipment where source impedance exceeds 500 kΩ. IC Role / Device Role / Timing Role: Delta-sigma ADC with Easy Drive architecture serving as front-end digitizer; handles rail-to-rail input signals without external amplification. Use Value: Achieves 0.6 µV RMS noise and 2 ppm INL even with >1 MΩ source impedance - avoids gain error and drift introduced by discrete buffer stages. |
| Multi-Channel Data Acquisition Systems | Temperature-Compensated Instrumentation |
Use Scenario: Modular DAQ modules for OEM test benches requiring synchronized sampling across 8 differential or 16 single-ended channels. IC Role / Device Role / Timing Role: Central 16-bit ADC with programmable gain and channel sequencing; uses internal oscillator for deterministic timing and jitter-free conversions. Use Value: Enables single-chip solution for 16-channel acquisition at ≤15 Hz with no firmware overhead for channel management or filter settling. | Use Scenario: Precision weight scales and analytical balances requiring real-time temperature compensation of load cell offset and sensitivity drift. IC Role / Device Role / Timing Role: Dual-function IC performing simultaneous analog measurement and on-chip temperature sensing; shares same conversion cycle and SPI interface. Use Value: Delivers calibrated temperature readings (±2°C) alongside 16-bit sensor data using identical timing and register map - eliminates need for separate temperature IC and synchronization logic. |
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 |
|---|---|---|---|
| ADS1248IPWR | 24-bit resolution, 4-kSPS max, no integrated temp sensor, SPI interface with CRC | Higher resolution but higher power (2.6 mA active); requires external reference and PGA for gain scaling | Select when ENOB > 20 bits is required and system can accommodate larger footprint and higher supply current. |
| MAX11206ETN+ | 24-bit resolution, 10 SPS, internal oscillator, 8-channel, no PGA, ±2°C temp sensor | Lower channel count (8 vs 16), no programmable gain, smaller 20-pin TQFN package | Select for space-constrained designs needing ultra-low noise (55 nV RMS) and lower cost, but accepting reduced channel density and fixed gain. |
Compared with ADS1248IPWR and MAX11206ETN+, the LTC2494IUHF#PBF uniquely combines 16-channel flexibility, integrated PGA, Easy Drive input cancellation, and simultaneous 50/60 Hz rejection in a single QFN-38 package - making it optimal for compact, multi-sensor industrial nodes requiring minimal external components and guaranteed first-conversion validity.
Availability
LTC2494IUHF#PBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and multi-channel data acquisition systems requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LTC2494IUHF#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 semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC2494IUHF#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for high-accuracy, low-power, multi-channel sensor digitization in harsh industrial and instrumentation environments.
FAQ
What is the operating temperature range for the LTC2494IUHF#PBF?
The LTC2494IUHF#PBF is rated for operation from –40°C to +85°C, as confirmed by its "I" grade designation in the order information table. This extended industrial temperature range ensures reliable performance in factory automation, outdoor monitoring, and motor control applications where ambient temperatures fluctuate widely. The device maintains specified INL, offset, and noise performance across this full range.
Does the LTC2494IUHF#PBF require an external reference voltage?
No, the LTC2494IUHF#PBF does not require an external reference voltage to operate, though it supports external references. It can use its internal bandgap reference or accept an external differential reference (REF+/REF–) from 0.1 V to VCC. When performing on-chip temperature measurements, the minimum VREF must be 2 V. External references improve absolute accuracy in ratiometric or high-stability applications.
How does the Easy Drive technology in the LTC2494IUHF#PBF benefit high-impedance sensor interfaces?
The Easy Drive technology in the LTC2494IUHF#PBF eliminates dynamic differential input current through automatic cancellation, allowing direct connection of sensors with source impedances exceeding 1 MΩ without external buffers. This preserves DC accuracy, reduces component count, and avoids phase shift or gain error introduced by op-amp stages - critical for thermocouple, pH probe, and piezoelectric sensor applications.
Can the LTC2494IUHF#PBF perform simultaneous 50 Hz and 60 Hz line frequency rejection?
Yes, the LTC2494IUHF#PBF supports simultaneous 50 Hz and 60 Hz rejection mode, which places digital filter nulls at both frequencies to suppress mains-induced noise in globally deployed equipment. This mode is selected via the SDI command and requires an external oscillator frequency of 280 kHz ±2%, or uses the internal oscillator when fO is grounded. No firmware filtering is needed.
What is the function of the exposed pad (Pin 39) on the LTC2494IUHF#PBF QFN package?
The exposed pad (Pin 39) on the LTC2494IUHF#PBF is electrically and thermally connected to GND. It must be soldered to the PCB ground plane to ensure proper thermal dissipation, low-impedance grounding, and optimal PSRR performance. Leaving it unconnected degrades noise, linearity, and long-term reliability - per Linear Technology's UHF package assembly guidelines.
LTC2494IUHF#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 38-WFQFN Exposed Pad
- Packaging:
- Tube
- 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#PBF FAQ
1.How can I place an order for LTC2494IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2494IUHF#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 LTC2494IUHF#PBF reliable?
The price and inventory of LTC2494IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2494IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2494IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2494IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2494IUHF#PBF?
LTC2494IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2494IUHF#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 LTC2494IUHF#PBF?
For technical support, including LTC2494IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2494IUHF#PBF requirements.
6.How does Aetrix verify that LTC2494IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2494IUHF#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 LTC2494IUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2494IUHF#PBF?
All LTC2494IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2494IUHF#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 LTC2494IUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2494IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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