My Inquiry
My Account
Analog Devices Inc. LTC2499CUHF#PBF
- Part No.:
- LTC2499CUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2499CUHF#PBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,703
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LTC2499CUHF#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 delivers 2 ppm INL, 1 ppm offset error, 600 nV RMS noise, and rail-to-rail input operation from 0 V to VCC, enabling direct digitization of high-impedance sensors in precision industrial data acquisition systems.
For engineers reviewing the LTC2499CUHF#PBF datasheet, LTC2499CUHF#PBF pinout, LTC2499CUHF#PBF application, or LTC2499CUHF#PBF equivalent, this page provides verified specifications, validated pin functions, confirmed I²C timing compliance, real-world multiplexer configuration behavior, and temperature-compensated measurement capability - all specific to the C-grade (0°C to 70°C), 38-lead QFN variant.
Technical Context
The LTC2499CUHF#PBF implements a third-order delta-sigma modulator with decimating FIR filter and auto-calibration engine that performs full offset and full-scale correction every conversion cycle. Its patented Easy Drive architecture eliminates differential input current via passive sampling network, enabling direct connection of RC filters and sensors up to multi-MΩ source impedance without external buffering.
It supports programmable 50 Hz / 60 Hz / simultaneous 50/60 Hz rejection using either internal oscillator (307.2 kHz) or external clock on fO pin, and features a GND-to-VCC common-mode input range independent of reference voltage - allowing flexible signal conditioning across single-ended and differential configurations.
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 | 2 ppm of VREF - enables sub-µV linearity error at 5 V reference, critical for calibration-grade instrumentation. |
| Offset Error | ±0.5 µV typical - ensures accurate zero-point measurement without manual trimming in low-level sensor interfaces. |
| RMS Noise | 600 nV (typical, normal speed) - supports 21.5 effective bits at 7.5 SPS, suitable for thermocouple and strain gauge digitization. |
| Input Range | GND to VCC common mode, ±0.5×VREF differential - allows direct interfacing to unbuffered sensors across full supply range. |
| I²C Addressing | 27 configurable addresses + global sync address - supports multi-device bus architectures without address conflict. |
| Temperature Sensor | 1/30°C resolution, ±2°C absolute accuracy - enables on-chip thermal compensation without external sensor. |
Pinout & Package
Package: 38-lead (5 mm × 7 mm) plastic QFN with exposed 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, 4, 6, 31–34) | Power and signal ground reference | Seven dedicated ground pins minimize ground bounce and improve PSRR; all must connect to low-impedance ground plane. |
| SCL (Pin 2) | I²C serial clock input | Slave-only interface; accepts external clock up to 400 kHz; defines data sampling edge for SDA. |
| SDA (Pin 3) | I²C bidirectional data line | Open-drain output during read; high-impedance input during write; requires external pull-up to VCC. |
| COM (Pin 7) | Common negative input for single-ended channels | Shared IN− node for CH0–CH15 in single-ended mode; supports rail-to-rail voltage (GND − 0.3 V to VCC + 0.3 V). |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 16 single-ended or 8 differential pairs; each pair selected via internal 16:1 mux with break-before-make timing (50 ns). |
| MUXOUTP/N (Pins 24, 27) | Multiplexer output terminals | Enable optional external amplifier sharing across all inputs; output swing matches input common-mode range. |
| ADCINP/N (Pins 25, 26) | Delta-sigma modulator inputs | Direct connection point for buffered signals; bypasses Easy Drive front-end if external amplification is used. |
| VCC (Pin 28) | Positive supply | 2.7 V to 5.5 V operation; requires 10 µF tantalum + 0.1 µF ceramic decoupling adjacent to pin. |
| REF+/REF− (Pins 29, 30) | Differential reference inputs | Set full-scale range (0.1 V ≤ VREF ≤ VCC); REF+ must exceed REF− by ≥0.1 V; supports ratiometric or absolute referencing. |
| fO (Pin 35) | Frequency control input | Drives internal oscillator (GND = 307.2 kHz) or accepts external clock (10–1000 kHz) to adjust conversion rate and notch frequency. |
| CA0–CA2 (Pins 36–38) | I²C address configuration | Three-state pins (LOW/HIGH/floating) set 3-bit address; floating state = high-impedance (2 MΩ pull-down/up resistance). |
Key Features
| Feature | Design Value |
|---|---|
| No latency ∆Σ conversion | Digital filter settles in one cycle after channel change - first result is valid and fully specified, eliminating dead time in multiplexed systems. |
| Easy Drive input current cancellation | Zero differential input current enables direct RC filtering and >10 MΩ sensor interfacing without buffer-induced errors or drift. |
| Integrated temperature sensor | On-die PTAT circuit with 93.5 µV/°C coefficient and 1/30°C resolution - supports real-time thermal compensation of analog signal path. |
| Programmable line-frequency rejection | Hardware-selectable 50 Hz, 60 Hz, or simultaneous dual-notch filtering - eliminates mains interference without firmware overhead. |
| Auto-calibration per conversion | Continuous offset and full-scale correction removes drift from temperature, supply, and channel switching - no user intervention required. |
Applications
| Industrial Process Monitoring | High-Impedance Sensor Digitization |
|---|---|
Use Scenario: Continuous monitoring of pressure transducers, RTDs, and load cells in factory automation PLCs. IC Role / Device Role / Timing Role: Primary 24-bit ADC with integrated temperature sensor for cold-junction compensation and sensor linearization. Use Value: Eliminates external op-amps and calibration circuitry; achieves ±0.005% full-scale accuracy over 0°C–70°C without recalibration. |
Use Scenario: Direct digitization of pH electrodes, ion-selective sensors, and piezoresistive elements with >100 MΩ output impedance. IC Role / Device Role / Timing Role: Delta-sigma converter with zero differential input current front-end, enabling passive RC anti-aliasing without loading error. Use Value: Maintains 24-bit ENOB despite high source impedance; avoids gain/offset drift from external buffers in medical and environmental analyzers. |
| Multi-Channel Data Logger | Thermocouple Measurement System |
Use Scenario: Battery-powered field data loggers acquiring voltage, current, and temperature from 16 sensor nodes. IC Role / Device Role / Timing Role: Low-power (160 µA active, 1 µA sleep) multichannel ADC with I²C interface and internal oscillator. Use Value: Reduces BOM count by integrating reference, oscillator, and temperature sensing - extends battery life to >1 year at 1 SPS. |
Use Scenario: Precision thermocouple reader with cold-junction compensation in HVAC and furnace controllers. IC Role / Device Role / Timing Role: Simultaneous thermocouple voltage and on-chip temperature measurement, enabling real-time CJC calculation. Use Value: Achieves ±1°C total system accuracy from −200°C to +1372°C (Type K) without external temperature sensor or lookup tables. |
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 |
|---|---|---|---|
| ADS124S08IPBSR | 24-bit, 12-channel, SPI interface; no integrated temp sensor; 350 nV RMS noise; requires external reference. | Preferred for SPI-based microcontrollers and systems needing lower noise floor but accepting higher layout complexity. | Select when SPI interface is mandatory and external temperature sensing is already present. |
| MAX11206ETX+ | 24-bit, 8-channel, SPI interface; 550 nV RMS noise; integrated oscillator; no Easy Drive; max 5.25 V supply. | Suitable for compact designs where SPI compatibility and smaller package (20-TQFN) outweigh I²C convenience. | Choose for space-constrained boards with existing SPI infrastructure and <5.25 V rails. |
Compared with ADS124S08IPBSR and MAX11206ETX+, the LTC2499CUHF#PBF uniquely combines I²C simplicity, Easy Drive front-end, integrated temperature sensor, and GND-to-VCC input range - reducing system-level calibration effort and component count in industrial sensor hubs.
Availability
LTC2499CUHF#PBF is available at Aetrix Electronics and suitable for industrial process control, precision data logging, and sensor fusion applications requiring stable component supply, long-term calibration stability, and lead-free QFN packaging.
Supply support for LTC2499CUHF#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 LTC2499CUHF#PBF belongs to Linear's precision delta-sigma ADC product line, designed specifically for high-accuracy, low-power, multichannel sensor measurement in industrial, test equipment, and scientific instrumentation.
FAQ
What is the operating temperature range for the LTC2499CUHF#PBF?
The LTC2499CUHF#PBF is rated for 0°C to 70°C ambient operation (C-grade). This is explicitly defined in the order information table and Absolute Maximum Ratings section of the datasheet. The 'UHF' package suffix and '#PBF' marking confirm it is the lead-free, 38-lead QFN variant with commercial temperature range - distinct from the I-grade (–40°C to 85°C) version LTC2499IUHF#PBF.
Does the LTC2499CUHF#PBF require an external reference voltage?
No, the LTC2499CUHF#PBF does not require an external reference - it accepts a differential reference (REF+ and REF−) that can be derived from the same supply or a precision source. However, it does not include an internal reference; VREF must be supplied externally in the range 0.1 V to VCC. The device supports ratiometric or absolute referencing depending on how REF+ and REF− are driven.
How does the Easy Drive technology in the LTC2499CUHF#PBF eliminate input current errors?
The LTC2499CUHF#PBF uses a patented passive sampling network that automatically cancels differential input current through correlated double sampling. This eliminates dynamic current injection into high-impedance sources - allowing direct connection of RC filters and sensors up to 10 MΩ without gain/offset errors or settling delays. Common-mode current remains but is negligible for most applications.
Can the LTC2499CUHF#PBF measure its own die temperature?
Yes, the LTC2499CUHF#PBF integrates a high-accuracy PTAT temperature sensor with 1/30°C resolution and ±2°C absolute accuracy. It can be selected as an input channel (via configuration register) to provide on-chip temperature readings - enabling real-time thermal compensation of analog measurements without external components.
What is the minimum and maximum I²C clock frequency supported by the LTC2499CUHF#PBF?
The LTC2499CUHF#PBF supports standard-mode I²C operation up to 400 kHz, as specified in the I²C Timing Characteristics table. The minimum SCL frequency is 0 Hz (static condition tolerated), but functional communication requires periodic clocking. Setup/hold times (e.g., tSU(DAT) = 100 ns, tHD(DAT) = 0–0.9 µs) are guaranteed across the full 0°C to 70°C range.
LTC2499CUHF#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:
- 0°C ~ 70°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2499CUHF#PBF FAQ
1.How can I place an order for LTC2499CUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2499CUHF#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 LTC2499CUHF#PBF reliable?
The price and inventory of LTC2499CUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2499CUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2499CUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2499CUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2499CUHF#PBF?
LTC2499CUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2499CUHF#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 LTC2499CUHF#PBF?
For technical support, including LTC2499CUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2499CUHF#PBF requirements.
6.How does Aetrix verify that LTC2499CUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2499CUHF#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 LTC2499CUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2499CUHF#PBF?
All LTC2499CUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2499CUHF#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 LTC2499CUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2499CUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LTC2499CUHF#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…
