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Analog Devices Inc. LTC2497CUHF#PBF
- Part No.:
- LTC2497CUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2497CUHF#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:391
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Product details
Overview
LTC2497CUHF#PBF from Analog Devices (formerly Linear Technology) is a 16-bit, 16-channel (8-differential) delta-sigma ADC with Easy Drive input current cancellation, I²C interface, and integrated oscillator. It delivers 2 ppm INL, 1 ppm offset error, and simultaneous 50/60 Hz rejection - enabling direct digitization of high-impedance sensors in industrial process control systems without external buffering.
For engineers reviewing the LTC2497CUHF#PBF datasheet, LTC2497CUHF#PBF pinout, LTC2497CUHF#PBF application, or LTC2497CUHF#PBF equivalent, key selection criteria include rail-to-rail common-mode input range (GND to VCC), zero differential input current, no-latency conversion settling, and 38-pin QFN package compatibility with space-constrained sensor front-ends.
Technical Context
The LTC2497CUHF#PBF implements a 3rd-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 sampling network cancels differential input current dynamically, eliminating errors from source impedance mismatch up to 100 kΩ.
It operates with internal 307.2 kHz oscillator (fO = GND) or accepts external clock (10–1000 kHz) for configurable data rate and notch tuning. The I²C interface supports 27 slave addresses plus global sync address, with fast-mode (400 kHz) timing compliance and built-in hysteresis on SCL/SDA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and unambiguous digital representation across full input range. |
| INL | 2 ppm of VREF - enables ±0.00003% linearity-critical measurements in precision instrumentation. |
| Offset Error | 1 µV typical - eliminates need for system-level zero-point calibration in low-drift temperature sensing. |
| Full-Scale Error | 15 ppm of VREF - ensures accuracy within 0.0015% of span without per-channel gain trimming. |
| Noise (RMS) | 0.6 µV RMS - corresponds to 0.02 LSB transition noise, supporting sub-microvolt signal resolution. |
| Common-Mode Range | GND to VCC - allows direct interfacing to sensors operating beyond reference rails, e.g., thermocouples or bridge outputs. |
| Power Supply | 2.7 V to 5.5 V - supports single-supply operation from Li-ion, USB, or industrial 3.3 V/5 V rails. |
| Conversion Time | 144.1 ms (internal clock) - sets default output data rate at ~6.9 Hz with inherent 50/60 Hz rejection. |
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, Exposed Pad 39) | System Ground Reference | Seven dedicated ground pins + exposed pad ensure low-impedance return paths for analog, digital, and power domains - critical for 16-bit noise floor integrity. |
| SCL (Pin 2) | I²C Serial Clock Input | Slave-only clock input; accepts standard/fast-mode frequencies 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 | Shared IN– node for all 16 single-ended channels; supports rail-to-rail voltage (GND – 0.3 V to VCC + 0.3 V). |
| CH0–CH15 (Pins 8–23) | Analog Input Channels | Programmable as 16 single-ended or 8 differential pairs; each accepts full common-mode range independent of VREF. |
| MUXOUTP/N (Pins 24, 27) | Multiplexer Output Terminals | Accessible pre-ADC nodes for optional external amplification; enable shared amplifier topology across all channels. |
| ADCINP/N (Pins 25, 26) | ADC Input Terminals | Direct connection points to delta-sigma modulator; short to MUXOUTP/N when no external buffer is used. |
| VCC (Pin 28) | Positive Supply | 2.7 V to 5.5 V operation; requires 10 µF tantalum + 0.1 µF ceramic bypass close to pin for stable conversion. |
| REF+/REF– (Pins 29, 30) | Differential Reference Inputs | Accept 0.1 V to VCC differential range; common-mode voltage independent of VREF - enables ratiometric or floating reference designs. |
| fO (Pin 35) | Oscillator Control | Logic-low selects internal 307.2 kHz clock; external square wave (10–1000 kHz) enables custom data rate and notch tuning. |
| CA0–CA2 (Pins 36–38) | I²C Address Bits | Three-state inputs (LOW/HIGH/FLOAT) configure one of 27 unique slave addresses; FLOAT = high-impedance state. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive Input Current Cancellation | Eliminates differential input current errors - enables direct connection of >100 kΩ source impedances without gain/offset degradation. |
| No-Latency Delta-Sigma Architecture | Digital filter settles in single conversion cycle - first result after channel change is fully accurate, no wait states required. |
| Simultaneous 50 Hz / 60 Hz Rejection | Hardware-based notch filtering - removes both line frequencies without software post-processing or additional timing constraints. |
| Auto-Calibration per Conversion | Continuous offset and full-scale correction - maintains 1 ppm offset and 15 ppm full-scale accuracy over temperature, supply, and channel switching. |
| Rail-to-Rail Input Common-Mode Range | GND to VCC independent of reference - supports direct digitization of sensors with output swings beyond VREF rails (e.g., RTDs, strain gauges). |
| Low Power Sleep Mode | 1 µA typical quiescent current - reduces system power by >100× during idle periods while retaining conversion result in static register. |
Applications
| Industrial Process Monitoring | High-Precision Temperature Sensing |
|---|---|
|
Use Scenario: Continuous monitoring of 12 thermocouple and 4 RTD inputs in PLC analog input modules. IC Role / Device Role / Timing Role: Simultaneous 16-channel digitizer with per-channel auto-calibration and line-frequency rejection for stable long-term drift performance. Use Value: Eliminates external op-amps and discrete calibration circuitry - reduces BOM count by 8+ components per channel while maintaining <1 µV offset stability over –40°C to 70°C. |
Use Scenario: Direct digitization of Pt1000 RTD bridges in medical patient temperature monitors. IC Role / Device Role / Timing Role: Precision delta-sigma ADC with programmable gain-less front-end and integrated reference rejection. Use Value: Achieves 0.01°C resolution using 4-wire RTD configuration - enabled by 2 ppm INL, 0.6 µV RMS noise, and common-mode range extending below GND. |
| Programmable Logic Controller (PLC) I/O Modules | Multi-Sensor Environmental Data Loggers |
|
Use Scenario: 16-channel analog input card accepting mixed voltage, current, and resistance sensors in factory automation cabinets. IC Role / Device Role / Timing Role: Configurable multiplexer + ADC with I²C interface for microcontroller host communication and channel sequencing. Use Value: Supports single-ended and differential modes on same hardware - simplifies firmware design and enables field-reconfigurable input types without layout changes. |
Use Scenario: Battery-powered environmental logger measuring CO₂, humidity, pressure, and ambient light via analog sensor outputs. IC Role / Device Role / Timing Role: Ultra-low-power ADC with sleep mode (1 µA) and no-latency conversion for duty-cycled measurement bursts. Use Value: Extends 2000 mAh battery life to >5 years at 1 reading/minute - enabled by sub-µA sleep current and single-cycle valid output. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision multichannel ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPBSR | 24-bit resolution, SPI interface, 32-kSPS max rate; no integrated oscillator; requires external reference; higher power (350 µA active). | Better resolution for weigh scales; less suitable for I²C-based microcontrollers or low-power sensor nodes. | Choose ADS124S08IPBSR when 24-bit resolution and faster throughput outweigh I²C compatibility and ultra-low sleep current. |
| MAX11206ETX+ | 24-bit, I²C, 10-ppm INL, 1.2 µV offset; no Easy Drive; requires external buffer for >10 kΩ sources; 16-pin TQFN. | Lower channel count (8 single-ended); lacks simultaneous 50/60 Hz rejection; smaller footprint but higher input impedance sensitivity. | Choose MAX11206ETX+ for compact 8-channel designs where external buffering is acceptable and line rejection is handled digitally. |
Compared with LTC2497CUHF#PBF, ADS124S08IPBSR offers higher resolution but demands SPI host support and consumes 20× more active current, while MAX11206ETX+ fits tighter layouts but forfeits rail-to-rail input capability and dynamic input current cancellation - making LTC2497CUHF#PBF optimal for unbuffered, multi-sensor, I²C-based industrial front-ends.
Availability
LTC2497CUHF#PBF is available at Aetrix Electronics and suitable for industrial process control, high-precision temperature sensing, and programmable logic controller I/O modules requiring stable component supply, long-lifecycle support, and guaranteed lead-free compliance.
Supply support for LTC2497CUHF#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 technologies for precision measurement and control.
The LTC2497CUHF#PBF belongs to Linear's No Latency ΔΣ ADC product line, designed specifically for direct sensor digitization in industrial, test & measurement, and medical equipment where zero-latency, rail-to-rail input, and dynamic input current cancellation are mandatory.
FAQ
What is the operating temperature range for the LTC2497CUHF#PBF?
The LTC2497CUHF#PBF is rated for 0°C to 70°C ambient operation (Commercial grade). This is confirmed by the "UHF" package suffix and order information table specifying "0°C to 70°C" for part number LTC2497CUHF#PBF. The device meets all electrical specifications across this full range, including INL ≤ 2 ppm, offset drift ≤ 10 nV/°C, and PSRR ≥ 120 dB.
Does the LTC2497CUHF#PBF require an external reference voltage?
No - the LTC2497CUHF#PBF accepts an external differential reference (REF+ and REF–), but it does not require one: REF+ may be tied to VCC and REF– to GND for simplest operation. The reference range is 0.1 V to VCC, and the device maintains full 16-bit performance across this range. Internal reference is not provided; external connection is mandatory for conversion.
How does the Easy Drive technology in the LTC2497CUHF#PBF eliminate input current errors?
The LTC2497CUHF#PBF uses a patented passive sampling network that automatically cancels differential input current in real time. This eliminates dynamic errors caused by source impedance mismatch - allowing direct connection of sensors with impedances up to 100 kΩ while preserving DC accuracy. Common-mode current is minimized via balanced routing or matching to reference common-mode voltage.
Can the LTC2497CUHF#PBF perform simultaneous sampling across multiple channels?
No - the LTC2497CUHF#PBF is a multiplexed ADC with sequential channel scanning. It supports up to 16 single-ended or 8 differential inputs, but only one pair is converted per cycle. However, its "no latency" architecture ensures the first result after any channel change is fully settled and accurate - eliminating traditional filter delay penalties seen in other delta-sigma converters.
What is the function of the fO pin on the LTC2497CUHF#PBF?
The fO pin on the LTC2497CUHF#PBF controls the conversion clock source. When pulled to GND, it selects the internal 307.2 kHz oscillator, setting default conversion time at 144.1 ms. When driven with an external square wave (10–1000 kHz), it overrides the internal clock - enabling adjustable data rates and precise tuning of the digital filter's 50/60 Hz rejection nulls.
LTC2497CUHF#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):
- 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
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2497CUHF#PBF FAQ
1.How can I place an order for LTC2497CUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2497CUHF#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 LTC2497CUHF#PBF reliable?
The price and inventory of LTC2497CUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2497CUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2497CUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2497CUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2497CUHF#PBF?
LTC2497CUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2497CUHF#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 LTC2497CUHF#PBF?
For technical support, including LTC2497CUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2497CUHF#PBF requirements.
6.How does Aetrix verify that LTC2497CUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2497CUHF#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 LTC2497CUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2497CUHF#PBF?
All LTC2497CUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2497CUHF#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 LTC2497CUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2497CUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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