My Inquiry
My Account
Analog Devices Inc. LTC2499IUHF#PBF
- Part No.:
- LTC2499IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2499IUHF#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:834
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2499IUHF#PBF from Analog Devices (formerly Linear Technology) is a 24-bit, 16-channel (8-differential) delta-sigma ADC with I²C interface, Easy Drive input current cancellation, and integrated temperature sensor. It operates from 2.7V to 5.5V, delivers 600nV RMS noise, 2ppm INL, and supports simultaneous 50Hz/60Hz rejection - enabling high-accuracy direct digitization of rail-to-rail, high-impedance sensor signals in industrial data acquisition systems.
For engineers reviewing the LTC2499IUHF#PBF datasheet, LTC2499IUHF#PBF pinout, LTC2499IUHF#PBF application, or LTC2499IUHF#PBF equivalent, key selection considerations include its no-latency ∆Σ architecture, programmable rejection modes, integrated PTAT temperature sensor (±2°C absolute accuracy), 38-pin QFN package, and I²C address configurability via CA0–CA2 pins.
Technical Context
The LTC2499IUHF#PBF employs a third-order delta-sigma modulator with decimating FIR filter and auto-calibration per conversion cycle, eliminating latency and ensuring first-conversion validity after channel change. Its patented Easy Drive front end cancels differential input current dynamically, enabling direct connection of sensors with source impedances up to 100kΩ without external buffering.
It integrates a precision internal oscillator (307.2kHz nominal), supports external clocking via fO pin, and provides programmable 50Hz/60Hz/simultaneous rejection. The device features GND-to-VCC common-mode input range independent of reference voltage, and allows mixed single-ended/differential channel selection with full DC accuracy across all 16 inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full dynamic range utilization for precision measurement. |
| INL | 2ppm of VREF - ensures linearity error ≤ ±0.0002% of full scale, critical for calibration-grade instrumentation. |
| Offset Error | ±0.5µV typical - enables sub-microvolt DC offset compensation in strain gauge or thermocouple interfaces. |
| RMS Noise | 600nV - supports 20.5+ ENOB at 7.5Hz output rate, suitable for low-level sensor signal digitization. |
| Temp Sensor Accuracy | ±2°C absolute - allows on-chip thermal compensation without external sensor in embedded control loops. |
| Supply Range | 2.7V to 5.5V - compatible with both 3.3V and 5V industrial logic domains and battery-powered systems. |
| I²C Addresses | 27 configurable + 1 global sync - supports multi-device synchronization in dense sensor arrays without address conflict. |
Pinout & Package
Package: 38-lead (5mm × 7mm) plastic QFN with exposed pad (Pin 39 = GND, must be soldered).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1,4,6,31–34) | Ground reference | Seven dedicated ground pins minimize ground bounce and improve PSRR; all must connect to PCB ground plane. |
| SCL (Pin 2) | I²C clock input | Slave-only interface; accepts external clock up to 400kHz; timing-critical for data sampling alignment. |
| SDA (Pin 3) | I²C bidirectional data | Open-drain output requiring pull-up; handles 32-bit read/write transfers including channel configuration and result data. |
| COM (Pin 7) | Common negative input | Shared IN– for all single-ended channels; supports rail-to-rail common-mode range (GND–0.3V to VCC+0.3V). |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 16 single-ended or 8 differential pairs; each pair supports ±0.5×VREF differential input range. |
| MUXOUTP/N (Pins 24,27) | Multiplexer outputs | Enable optional external amplifier sharing across all channels; support auto-calibration of amplifier offset/drift. |
| ADCINP/N (Pins 25,26) | ADC analog inputs | Direct connection point to internal modulator; bypasses multiplexer when using external signal conditioning. |
| VCC (Pin 28) | Power supply | Requires local decoupling: 10µF tantalum || 0.1µF ceramic; supports 0.8mW typical power consumption. |
| REF+/REF– (Pins 29,30) | Differential reference | Set full-scale range (0.1V ≤ VREF ≤ VCC); reference common-mode range independent of input common mode. |
| fO (Pin 35) | Frequency control | Selects internal oscillator (GND) or external clock (10–1000kHz); determines conversion time and rejection null placement. |
| CA0–CA2 (Pins 36–38) | I²C address bits | Three-state (LOW/HIGH/floating) configuration enables 27 unique addresses; floating = high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| No Latency ∆Σ Architecture | Single-cycle digital filter settling ensures immediate validity of first conversion after channel change - eliminates dead time in multiplexed systems. |
| Easy Drive Input Current Cancellation | Automatic cancellation of differential input current enables direct digitization of high-impedance sources (e.g., RTDs, pH electrodes) without buffer-induced errors. |
| Integrated Temperature Sensor | 1/30°C resolution and ±2°C absolute accuracy provide on-chip thermal reference for drift compensation in precision analog front ends. |
| Programmable AC Rejection | Configurable 50Hz, 60Hz, or simultaneous dual-frequency rejection via internal oscillator or external fO clock - essential for EMI-prone industrial environments. |
| Auto-Calibration per Conversion | Continuous offset and full-scale correction removes drift from temperature, supply variation, and channel switching - no user intervention required. |
Applications
| Industrial Process Monitoring | High-Precision Sensor Interface |
|---|---|
Use Scenario: Continuous monitoring of pressure, flow, and level transmitters in chemical plant control cabinets with 4–20mA loop-powered sensors. IC Role / Device Role / Timing Role: Primary ADC digitizing multiple 4–20mA-derived voltage signals while rejecting 50/60Hz mains interference in noisy factory environments. Use Value: Eliminates need for external instrumentation amplifiers and anti-alias filters, reducing BOM cost and board space by >30% versus discrete solutions. | Use Scenario: Direct digitization of thermocouples, RTDs, and load cells in portable test equipment with battery life constraints. IC Role / Device Role / Timing Role: Rail-to-rail input ADC with integrated temperature sensor used for cold-junction compensation and self-calibration. Use Value: Achieves <1µV offset drift over temperature, enabling 0.01°C resolution in thermal measurement without external calibration hardware. |
| Energy Metering Subsystem | Medical Instrumentation Front End |
Use Scenario: Voltage and current sensing in Class 0.2 polyphase energy meters compliant with IEC 62053-21. IC Role / Device Role / Timing Role: High-accuracy, low-noise ADC capturing voltage/current waveforms with simultaneous 50Hz/60Hz rejection for harmonic analysis. Use Value: 600nV RMS noise and 2ppm INL meet metrology-grade accuracy requirements without oversampling or post-processing. | Use Scenario: Biopotential signal acquisition (ECG, EEG) in portable diagnostic devices requiring ultra-low power and high CMRR. IC Role / Device Role / Timing Role: Low-power, high-impedance-input ADC digitizing microvolt-level bio-signals with integrated reference and temperature tracking. Use Value: Easy Drive technology enables direct electrode connection without guard drivers, reducing leakage-induced baseline drift in long-duration recordings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-resolution multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1256IDBT | 24-bit, 8-channel, SPI interface; no integrated temp sensor; 10µV offset; 2.5V internal reference only. | Requires external temperature sensor for thermal compensation; SPI bus limits multi-drop capability. | Preferred where SPI infrastructure exists and I²C address flexibility is unnecessary. |
| MAX11206ETJ+ | 24-bit, 16-channel, I²C interface; no Easy Drive; 1.2µV offset; 1.5ppm INL; no simultaneous 50/60Hz rejection. | Lacks differential input current cancellation - mandates external buffers for high-Z sensors; weaker AC line rejection. | Selected when lower cost is prioritized over direct high-impedance sensor interfacing and advanced filtering. |
Compared with ADS1256IDBT and MAX11206ETJ+, the LTC2499IUHF#PBF uniquely combines I²C multi-address support, Easy Drive front-end cancellation, and simultaneous 50/60Hz rejection - making it optimal for compact, multi-sensor industrial nodes requiring minimal external components and robust noise immunity.
Availability
LTC2499IUHF#PBF is available at Aetrix Electronics and suitable for industrial process control, precision sensor interface, and energy metering applications requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for LTC2499IUHF#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LTC2499IUHF#PBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for high-accuracy, low-power, multi-channel data acquisition in harsh electromagnetic environments.
FAQ
What is the operating temperature range of the LTC2499IUHF#PBF?
The LTC2499IUHF#PBF is rated for operation from –40°C to +85°C, matching the "I" grade specification. This extended range supports deployment in industrial control cabinets, outdoor metering equipment, and automotive under-hood applications where ambient temperatures exceed commercial-grade limits. The device maintains full performance specifications-including 2ppm INL and ±0.5µV offset-across this entire range.
Does the LTC2499IUHF#PBF require external amplification for high-impedance sensors?
No, the LTC2499IUHF#PBF does not require external amplification for high-impedance sensors due to its patented Easy Drive input current cancellation technology. This feature eliminates differential input current errors, allowing direct connection of sensors with source impedances up to 100kΩ while preserving DC accuracy. The LTC2499IUHF#PBF achieves this without compromising noise or linearity specifications.
How does the LTC2499IUHF#PBF handle 50Hz and 60Hz interference rejection?
The LTC2499IUHF#PBF supports three rejection modes: 50Hz only, 60Hz only, or simultaneous 50Hz/60Hz rejection. This is achieved through programmable digital filtering synchronized to either its internal 307.2kHz oscillator or an external clock applied to the fO pin. The simultaneous mode uses a 280kHz external clock to place nulls at both frequencies-critical for global deployments where mains frequency varies by region.
Can the LTC2499IUHF#PBF measure temperature internally?
Yes, the LTC2499IUHF#PBF includes an integrated high-accuracy PTAT temperature sensor with 1/30°C resolution and ±2°C absolute accuracy across –40°C to +85°C. It can be selected as an input channel via I²C command, providing on-chip thermal monitoring for drift compensation, system health diagnostics, or ambient temperature logging without external components.
What is the significance of the "UHF" package designation in LTC2499IUHF#PBF?
The "UHF" in LTC2499IUHF#PBF denotes the 38-lead, 5mm × 7mm plastic QFN package with exposed thermal pad (Pin 39 = GND). This compact, surface-mount package offers excellent thermal performance and low inductance, supporting the LTC2499IUHF#PBF's 0.8mW typical power dissipation and high PSRR. The exposed pad must be soldered to the PCB ground plane for proper electrical and thermal operation.
LTC2499IUHF#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:
- 24
- Sampling Rate (Per Second):
- 7.5
- Number of Inputs:
- 8, 16
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- 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, Selectable Address, Temperature Sensor
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2499IUHF#PBF FAQ
1.How can I place an order for LTC2499IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2499IUHF#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 LTC2499IUHF#PBF reliable?
The price and inventory of LTC2499IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2499IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2499IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2499IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2499IUHF#PBF?
LTC2499IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2499IUHF#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 LTC2499IUHF#PBF?
For technical support, including LTC2499IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2499IUHF#PBF requirements.
6.How does Aetrix verify that LTC2499IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2499IUHF#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 LTC2499IUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2499IUHF#PBF?
All LTC2499IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2499IUHF#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 LTC2499IUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2499IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2499IUHF#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…
