My Inquiry
My Account
Analog Devices Inc. LTC2494CUHF#PBF
- Part No.:
- LTC2494CUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2494CUHF#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:103
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2494CUHF#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 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 enables direct digitization of rail-to-rail, high-impedance sensor signals in industrial data acquisition systems requiring precision temperature-compensated measurements.
For engineers reviewing the LTC2494CUHF#PBF datasheet, LTC2494CUHF#PBF pinout, LTC2494CUHF#PBF application, or LTC2494CUHF#PBF equivalent, key selection criteria include its programmable gain (1–256), simultaneous 50Hz/60Hz rejection mode, no-latency digital filter settling, integrated oscillator, and 38-lead QFN package with exposed thermal pad.
Technical Context
The LTC2494CUHF#PBF implements a 3rd-order delta-sigma modulator with decimating FIR filter and auto-calibration engine, enabling single-cycle digital filter settling after channel change. Its Easy Drive architecture cancels differential input current dynamically, eliminating errors from source impedance mismatch and allowing direct connection of sensors with >1MΩ output impedance.
It features dual-speed operation (1x/2x), configurable line-frequency rejection (50Hz, 60Hz, or simultaneous), and supports both internal oscillator (307.2kHz) and external clock for precise data rate control. The device integrates a PTAT temperature sensor with ±2°C absolute accuracy and 0.5°C resolution, referenced to internal bandgap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across full-scale range. |
| INL | 2 ppm of VREF - ensures <±0.0002% full-scale linearity error for high-accuracy calibration-critical systems. |
| Offset Error | ±0.5 µV typical - enables sub-microvolt DC measurement capability without external trimming. |
| RMS Noise | 0.6 µV RMS - supports 19.5+ ENOB at 7.5 SPS, critical for low-level sensor signal integrity. |
| Supply Range | 2.7V to 5.5V - allows direct interface with 3.3V and 5V industrial logic and sensor supplies. |
| Temp Range | 0°C to 70°C - specified for commercial-grade embedded instrumentation and process monitoring. |
| Gain Range | Programmable 1× to 256× in 8 steps - matches dynamic range to sensor output without external amplification. |
| Rejection Modes | Configurable 50Hz, 60Hz, or simultaneous 50/60Hz - eliminates mains-induced noise in global industrial environments. |
Pinout & Package
38-lead (5mm × 7mm) plastic QFN package 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 supports bipolar input range ±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 core inputs | Differential inputs to ΔΣ modulator; accept buffered or direct MUX outputs with minimal loading. |
| VCC (Pin 28) | Power supply | Requires local 10µF tantalum + 0.1µF ceramic bypass; supports 2.7V–5.5V operation with 160–275µA conversion current. |
| REF+/REF– (Pins 29,30) | Differential reference | Set full-scale range (±0.5·VREF/Gain); VREF = REF+ – REF– must be ≥0.1V and ≤VCC; common-mode range = GND to VCC. |
| SDI/SDO/SCK/CS/fO (Pins 34–38) | 4-wire SPI interface | Supports internal/external clock modes; CS controls wake/sleep; fO selects internal oscillator (GND) or external clock (10–1000kHz). |
Key Features
| Feature | Design Value |
|---|---|
| No Latency Conversion | Digital filter settles in one cycle after channel or mode change - eliminates wait states and enables real-time multiplexed scanning. |
| Easy Drive Input Cancellation | Automatically nulls differential input current - permits direct connection of high-impedance sensors (e.g., RTDs, thermocouples) without buffer op-amps. |
| Integrated Temperature Sensor | On-die PTAT sensor with ±2°C absolute accuracy and 0.5°C resolution - enables self-compensation without external components. |
| Simultaneous 50Hz/60Hz Rejection | Single configuration rejects both mains frequencies - simplifies global product certification and eliminates need for region-specific firmware. |
| Low Power Sleep Mode | 1 µA typical quiescent current - extends battery life in portable data loggers and remote sensors. |
| Flexible Reference Common-Mode | REF+ and REF– accept any voltage between GND and VCC - enables ratiometric or independent reference configurations. |
Applications
| Industrial Process Monitoring | Multi-Sensor Data Acquisition |
|---|---|
Use Scenario: Continuous monitoring of pressure, flow, and level transmitters in PLC-based control cabinets with mixed 50Hz/60Hz power environments. IC Role / Device Role / Timing Role: Primary ADC digitizing up to 16 analog sensor outputs while rejecting mains interference and compensating for ambient temperature drift. Use Value: Eliminates external anti-alias filters and op-amp buffers; simultaneous 50/60Hz rejection avoids firmware reconfiguration during global deployment. | Use Scenario: Battery-powered environmental logger capturing temperature, humidity, and gas concentration from multiple calibrated sensors over weeks. IC Role / Device Role / Timing Role: Low-power, high-accuracy ADC managing channel sequencing, gain selection, and on-chip temperature compensation autonomously. Use Value: 1 µA sleep current and no-latency channel switching extend operational life; integrated temperature sensor enables per-channel offset correction. |
| High-Impedance Sensor Interface | Temperature-Compensated Instrumentation |
Use Scenario: Direct digitization of platinum RTD (PT100/1000) bridges and thermistor networks in medical diagnostic equipment. IC Role / Device Role / Timing Role: Precision ADC with Easy Drive input cancellation serving as front-end for bridge-based sensors with >100kΩ source impedance. Use Value: Removes need for discrete instrumentation amplifiers and guarding traces; maintains 16-bit linearity without external trimming. | Use Scenario: Calibration-grade multimeter or handheld test instrument requiring stable DC accuracy across operating temperature range. IC Role / Device Role / Timing Role: Core measurement engine performing auto-zero, gain calibration, and real-time temperature compensation using internal sensor. Use Value: 2ppm INL and ±0.5 µV offset enable sub-0.001% basic accuracy; on-chip temperature data reduces calibration labor and BOM cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1248IPWR | 24-bit resolution, 4-channel, integrated PGA and reference; no on-chip temperature sensor; SPI interface only. | Higher resolution but fewer channels; lacks simultaneous 50/60Hz rejection and Easy Drive architecture. | Prefer when 24-bit resolution and lower noise are prioritized over channel count and mains rejection flexibility. |
| MAX11206ETN+ | 24-bit, 8-channel, internal oscillator, 50/60Hz rejection; no integrated temperature sensor; 20-lead TQFN. | Smaller package and higher resolution, but lacks COM pin for single-ended scalability and has no on-die temp sensor. | Choose for space-constrained designs needing 24-bit performance where external temperature sensing is acceptable. |
Compared with ADS1248IPWR and MAX11206ETN+, the LTC2494CUHF#PBF uniquely combines 16-channel flexibility, Easy Drive input cancellation, simultaneous 50/60Hz rejection, and integrated temperature sensing - making it optimal for cost-sensitive, multi-sensor industrial systems requiring robustness across global power standards.
Availability
LTC2494CUHF#PBF is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, high-impedance sensor interfaces, and temperature-compensated instrumentation requiring stable component supply and long-term design-in support.
Supply support for LTC2494CUHF#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LTC2494CUHF#PBF belongs to Linear's No Latency Delta-Sigma ADC family, designed specifically for precision, low-power, multi-channel data acquisition in industrial, medical, and test equipment where input current cancellation and flexible rejection modes are critical.
FAQ
What is the operating temperature range for the LTC2494CUHF#PBF?
The LTC2494CUHF#PBF is specified for commercial-grade operation from 0°C to 70°C. This range is validated across all key parameters including INL, offset error, noise, and gain accuracy. It is distinct from the industrial-grade LTC2494IUHF#PBF (–40°C to 85°C) and should be selected only for applications remaining within this ambient envelope.
Does the LTC2494CUHF#PBF require an external crystal or oscillator?
No, the LTC2494CUHF#PBF includes a fully integrated oscillator running at 307.2kHz when the fO pin is tied to GND. An external clock (10–1000kHz) may be applied to fO only if custom data rates or enhanced rejection null placement are required - otherwise, no external timing components are needed for standard operation.
How does the Easy Drive technology in the LTC2494CUHF#PBF improve measurement accuracy?
The Easy Drive technology in the LTC2494CUHF#PBF actively cancels differential input current during sampling, eliminating errors caused by source impedance imbalance. This allows direct connection of high-impedance sensors (e.g., thermistors, RTDs) without external buffers while maintaining 16-bit linearity and sub-µV offset - a key advantage over conventional delta-sigma ADCs.
Can the LTC2494CUHF#PBF measure temperature internally, and what is its accuracy?
Yes, the LTC2494CUHF#PBF integrates a PTAT temperature sensor with ±2°C absolute accuracy and 0.5°C resolution. It is factory-trimmed and requires no external components. The sensor output is accessible via dedicated command and provides real-time die temperature for system-level compensation - critical for drift-sensitive instrumentation.
What are the power consumption characteristics of the LTC2494CUHF#PBF in active and sleep modes?
In conversion mode, the LTC2494CUHF#PBF draws 160–275 µA depending on speed and supply; in sleep mode (CS HIGH), it consumes just 1 µA typical. The 2x speed mode increases throughput to ~15 SPS but raises current to ~200 µA, while 1x mode at 7.5 SPS minimizes power. All values are specified across 0°C to 70°C for the LTC2494CUHF#PBF.
LTC2494CUHF#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2494CUHF#PBF FAQ
1.How can I place an order for LTC2494CUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2494CUHF#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 LTC2494CUHF#PBF reliable?
The price and inventory of LTC2494CUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2494CUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2494CUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2494CUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2494CUHF#PBF?
LTC2494CUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2494CUHF#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 LTC2494CUHF#PBF?
For technical support, including LTC2494CUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2494CUHF#PBF requirements.
6.How does Aetrix verify that LTC2494CUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2494CUHF#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 LTC2494CUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2494CUHF#PBF?
All LTC2494CUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2494CUHF#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 LTC2494CUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2494CUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2494CUHF#PBF Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
