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Analog Devices Inc. LTC2499CUHF#TRPBF
- Part No.:
- LTC2499CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2499CUHF#TRPBF.pdf
- Description:
- IC ADC 24BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,174
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Product details
Overview
LTC2499CUHF#TRPBF 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, 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#TRPBF datasheet, LTC2499CUHF#TRPBF pinout, LTC2499CUHF#TRPBF application, or LTC2499CUHF#TRPBF equivalent, key selection considerations include its no-latency ∆Σ architecture, programmable 50/60 Hz rejection, 0.8 mW power consumption at 7.5 Hz output rate, and 38-lead QFN package with exposed thermal pad.
Technical Context
The LTC2499CUHF#TRPBF 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 front end eliminates differential input current errors without on-chip buffering, allowing direct connection of RC filters and sensors up to multi-MΩ source impedance.
It supports both internal oscillator (307.2 kHz) and external clock via fO pin for precise control of conversion timing and notch rejection. The I²C interface provides 27 configurable slave addresses plus one global address, and the device operates across 2.7 V to 5.5 V supply with GND-to-VCC common-mode input range independent of reference voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 24-bit with no missing codes - guarantees monotonicity and full dynamic range utilization in high-precision measurement. |
| INL | 2 ppm of VREF - enables sub-µV-level linearity error over full scale, critical for calibration-grade instrumentation. |
| Output Noise | 600 nV RMS - supports 20+ bit effective resolution in low-frequency, high-accuracy applications. |
| Input Common Mode Range | GND to VCC - allows direct digitization of rail-to-rail signals without level-shifting circuitry. |
| Power Consumption | 80 µA at 7.5 Hz output rate - enables ultra-low-power battery-operated sensor nodes with stable DC accuracy. |
| Temperature Sensor Accuracy | ±2°C absolute, 1/30°C resolution - provides on-chip thermal monitoring without external components. |
| Conversion Latency | No latency - first result after channel change is valid and fully settled, eliminating wait states in multiplexed systems. |
Pinout & Package
Package: 38-lead (5 mm × 7 mm) plastic QFN with exposed thermal 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 serial clock input | Slave-only interface; rising edge clocks data in, falling edge clocks data out - requires external master clock. |
| 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 | Shared IN− for all single-ended channels; supports ±0.5·VREF differential input range. |
| CH0–CH15 (Pins 8–23) | Analog input channels | Configurable as 16 single-ended or 8 differential inputs; each pair supports rail-to-rail common-mode voltage. |
| MUXOUTP/N (Pins 24,27) | Multiplexer outputs | Enable optional external amplifiers shared across all channels; support auto-calibration of amplifier offset/drift. |
| ADCINP/N (Pins 25,26) | ADC analog inputs | Differential inputs to modulator; accept buffered or direct MUXOUT signals - define final signal path gain/offset. |
| VCC (Pin 28) | Supply voltage | 2.7 V to 5.5 V operation; requires 10 µF tantalum + 0.1 µF ceramic bypass close to pin. |
| REF+/REF− (Pins 29,30) | Differential reference inputs | Set full-scale range (0.1 V ≤ VREF ≤ VCC); common-mode range independent of VREF value. |
| fO (Pin 35) | Frequency control | Connect to GND for internal 307.2 kHz oscillator; drive externally for custom data rates and notch tuning. |
| CA0–CA2 (Pins 36–38) | I²C address bits | Three-state (LOW/HIGH/floating) configuration yields 27 unique addresses - avoids bus conflicts in multi-device systems. |
Key Features
| Feature | Design Value |
|---|---|
| No-latency ∆Σ conversion | Single-cycle digital filter settling ensures immediate validity of first sample after channel change - eliminates dead time in scanning systems. |
| Easy Drive input current cancellation | Zero differential input current enables direct connection of high-Z sensors and RC anti-aliasing filters without buffer op-amps or accuracy degradation. |
| Integrated temperature sensor | On-die PTAT sensor with 93.5 µV/°C coefficient and ±2°C absolute accuracy - reduces BOM count and thermal drift uncertainty. |
| Programmable 50/60 Hz rejection | Simultaneous dual-notch filtering rejects both mains frequencies without trade-off in update rate or noise - essential for EMI-prone industrial environments. |
| Auto-calibration per conversion | Continuous offset and full-scale correction compensates for temperature drift, supply variation, and channel-dependent errors - maintains spec compliance over life. |
Applications
| Industrial Process Monitoring | High-Impedance Sensor Digitization |
|---|---|
Use Scenario: Continuous monitoring of thermocouples, RTDs, and strain gauges in PLC-based control cabinets with 50/60 Hz ambient noise. IC Role / Device Role / Timing Role: Primary 24-bit ADC with integrated temperature compensation and simultaneous mains-frequency rejection. Use Value: Eliminates external instrumentation amplifiers and digital filtering firmware, reducing system cost and calibration complexity while maintaining ±2 ppm accuracy. | Use Scenario: Direct digitization of pH electrodes, ion-selective sensors, and piezoresistive pressure transducers with >10 MΩ source impedance. IC Role / Device Role / Timing Role: Rail-to-rail input ADC with zero differential input current and Easy Drive architecture. Use Value: Preserves sensor signal integrity without loading error - achieves full 24-bit resolution without buffer-induced offset drift or noise. |
| Portable Precision Data Loggers | Multi-Channel Temperature-Compensated Instrumentation |
Use Scenario: Battery-powered environmental monitors logging temperature, humidity, and gas concentration over weeks on single charge. IC Role / Device Role / Timing Role: Ultra-low-power ADC with 80 µA sleep current and integrated temperature sensor for self-compensation. Use Value: Enables 7.5 Hz output rate with 0.8 mW total power - extends battery life while delivering calibrated measurements without host MCU intervention. | Use Scenario: Calibration-grade multimeters and benchtop DMMs requiring traceable accuracy across multiple input ranges and temperatures. IC Role / Device Role / Timing Role: High-stability ADC with per-conversion auto-calibration and on-chip thermal reference. Use Value: Reduces warm-up time and long-term drift; ±2°C on-die sensor enables real-time gain/offset correction without external thermal sensors. |
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 delta-sigma ADC with SPI interface; no integrated temperature sensor; 10 µV offset error vs. LTC2499's 0.5 µV typical. | Requires external I²C-to-SPI bridge for I²C bus compatibility; lacks simultaneous 50/60 Hz rejection mode. | Select when SPI interface is preferred and external temperature sensing is acceptable. |
| MAX11206ETN+ | 24-bit, 16-channel delta-sigma ADC with I²C interface; 1.5 µV RMS noise vs. LTC2499's 0.6 µV; no Easy Drive front end - requires external buffers for high-Z sources. | Higher noise floor limits effective resolution in low-frequency DC applications; lacks rail-to-rail input capability. | Select for cost-sensitive designs where 0.6 µV noise and zero differential input current are not required. |
Compared with ADS1256IDBT and MAX11206ETN+, the LTC2499CUHF#TRPBF uniquely combines I²C interface, integrated temperature sensor, Easy Drive input architecture, and simultaneous 50/60 Hz rejection - making it optimal for compact, self-calibrating, noise-immune industrial data acquisition where board space and calibration overhead are constrained.
Availability
LTC2499CUHF#TRPBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, and high-impedance sensor digitization requiring stable component supply and long-term production continuity.
Supply support for LTC2499CUHF#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, formed through the acquisition of Linear Technology in 2017.
The LTC2499CUHF#TRPBF belongs to ADI's precision delta-sigma ADC product line, designed specifically for high-accuracy, low-power, multichannel data acquisition in noise-sensitive industrial and scientific instrumentation.
FAQ
What is the operating temperature range for the LTC2499CUHF#TRPBF?
The LTC2499CUHF#TRPBF is specified for the commercial temperature range of 0°C to 70°C. This grade is validated for use in non-automotive industrial equipment, test instruments, and commercial data loggers where ambient conditions remain within this envelope. The 'U' suffix denotes the QFN package, and 'C' indicates the commercial temperature grade - distinct from the industrial-grade LTC2499IUHF#TRPBF (–40°C to 85°C).
Does the LTC2499CUHF#TRPBF require external components for basic operation?
Yes, the LTC2499CUHF#TRPBF requires a 10 µF tantalum capacitor in parallel with a 0.1 µF ceramic capacitor between VCC and GND, placed as close as possible to Pins 28 and 1/4/6/31–34. An external pull-up resistor on SDA is also mandatory for I²C communication. No external oscillator or reference is needed - the device includes an internal oscillator and supports direct connection of external references from 0.1 V to VCC.
How does the Easy Drive technology in the LTC2499CUHF#TRPBF eliminate input current errors?
The LTC2499CUHF#TRPBF uses a patented passive sampling network that automatically cancels differential input current at the multiplexer output stage. This eliminates dynamic current errors caused by switched-capacitor sampling, enabling direct interface with high-impedance sources (e.g., pH probes, thermistors) without external op-amp buffers - while preserving DC accuracy and noise performance specified in the datasheet.
Can the LTC2499CUHF#TRPBF measure its own die temperature?
Yes, the LTC2499CUHF#TRPBF 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 the I²C command interface, providing on-chip thermal monitoring without external components - useful for ambient temperature compensation of sensor readings or system thermal management.
What I²C address options are available for the LTC2499CUHF#TRPBF?
The LTC2499CUHF#TRPBF supports 27 unique I²C slave addresses via three address pins (CA0, CA1, CA2), each configurable as LOW, HIGH, or floating (high-impedance). This yields 3³ = 27 combinations, plus one global address for synchronized conversions across multiple devices on the same bus - enabling scalable multichannel systems without address conflicts.
LTC2499CUHF#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC2499CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2499CUHF#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 LTC2499CUHF#TRPBF reliable?
The price and inventory of LTC2499CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2499CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2499CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2499CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2499CUHF#TRPBF?
LTC2499CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2499CUHF#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 LTC2499CUHF#TRPBF?
For technical support, including LTC2499CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2499CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2499CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2499CUHF#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 LTC2499CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2499CUHF#TRPBF?
All LTC2499CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2499CUHF#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 LTC2499CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2499CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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