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Analog Devices Inc. LTC2497IUHF#PBF
- Part No.:
- LTC2497IUHF#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2497IUHF#PBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,310
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Product details
Overview
LTC2497IUHF#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 Hz/60 Hz rejection for precision sensor digitization in industrial process control systems.
For engineers reviewing the LTC2497IUHF#PBF datasheet, LTC2497IUHF#PBF pinout, LTC2497IUHF#PBF application, or LTC2497IUHF#PBF equivalent, key selection criteria include rail-to-rail input support with zero differential input current, no-latency single-cycle digital filter settling, and direct high-impedance sensor interfacing without external buffering.
Technical Context
The LTC2497IUHF#PBF employs a 3rd-order delta-sigma modulator with decimating FIR filtering and patented Easy Drive sampling to cancel differential input current dynamically. Its auto-calibration engine performs full-scale and offset correction every conversion cycle, independent of channel selection.
It supports both internal (307.2 kHz) and external oscillator modes, enabling programmable output data rates from ~6.9 SPS to 6.9 kSPS. The I²C interface provides 27 configurable slave addresses plus one global sync address, operating up to 400 kHz in fast mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across full input range. |
| INL | 2 ppm of VREF - enables ±0.00003% linearity error in precision measurement applications. |
| Offset Error | 1 µV typical - allows sub-microvolt DC accuracy without factory calibration. |
| Noise | 600 nV RMS - corresponds to 0.02 LSB transition noise at 5 V reference, supporting high-resolution digitization. |
| Common Mode Range | GND to VCC - permits rail-to-rail input signals regardless of reference voltage setting. |
| Power Supply | 2.7 V to 5.5 V - supports single-supply operation across battery and industrial bus voltages. |
| Operating Temp | –40°C to +85°C - qualified for extended industrial environments without derating. |
Pinout & Package
38-lead (5 mm × 7 mm) plastic QFN package 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 1,4,6,31–34,39) | Ground reference and thermal path | Seven dedicated ground pins + exposed pad ensure low-impedance return paths and stable reference for precision analog operation. |
| SCL (Pin 2) | I²C serial clock input | Slave-only interface; accepts external clock up to 400 kHz; defines timing for data transfer on SDA. |
| SDA (Pin 3) | Bidirectional I²C 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 | Enables 16 single-ended inputs by pairing CH0–CH15 with COM; supports rail-to-rail common-mode voltage (GND – 0.3 V to VCC + 0.3 V). |
| CH0–CH15 (Pins 8–23) | Analog input channels | Programmable as 8 differential pairs or 16 single-ended inputs; each accepts ±0.5·VREF differential input range. |
| MUXOUTP/N (Pins 24,27) | Multiplexer outputs | Provide buffered access to selected analog input pair; enable optional external amplifiers shared across all channels. |
| ADCINP/N (Pins 25,26) | ADC front-end inputs | Direct connection point for MUXOUT or external signal conditioning; designed for minimal parasitic capacitance impact. |
| 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 noise suppression. |
| REF+/REF– (Pins 29,30) | Differential reference inputs | Accept 0.1 V to VCC differential voltage; common-mode range spans full supply (GND to VCC), enabling flexible reference sourcing. |
| fO (Pin 35) | Oscillator control | Logic-low selects internal 307.2 kHz oscillator; external clock overrides for custom data rate and notch tuning. |
| CA0–CA2 (Pins 36–38) | I²C address bits | Three-state (LOW/HIGH/FLOAT) configuration yields 27 unique addresses; FLOAT sets bit to high-impedance for address expansion. |
Key Features
| Feature | Design Value |
|---|---|
| Easy Drive input current cancellation | Eliminates differential input current errors automatically, enabling direct digitization of high-impedance sensors (e.g., RTDs, thermocouples) without buffer amplifiers. |
| No-latency delta-sigma architecture | Digital filter settles in one conversion cycle - first result after channel change is fully accurate and usable immediately. |
| Simultaneous 50 Hz/60 Hz rejection | Hardware-based notch filtering removes both line frequencies concurrently without software intervention or oversampling trade-offs. |
| Per-conversion auto-calibration | Continuous offset and full-scale correction eliminates drift due to temperature, supply variation, and channel switching - no user calibration required. |
| Rail-to-rail input common mode | Supports input signals from GND – 0.3 V to VCC + 0.3 V independent of reference voltage, simplifying sensor interface design. |
Applications
| Industrial Process Monitoring | Multi-Sensor Data Acquisition |
|---|---|
Use Scenario: Continuous monitoring of pressure, flow, and temperature transducers in PLC-controlled manufacturing lines. IC Role / Device Role / Timing Role: Precision ADC digitizing 16 analog sensor outputs with automatic channel sequencing and line-frequency rejection. Use Value: Eliminates need for external instrumentation amplifiers and line-filtering circuits, reducing BOM count and board area while maintaining ±2 ppm INL accuracy. |
Use Scenario: Simultaneous acquisition from thermocouples, strain gauges, and potentiometers in environmental test chambers. IC Role / Device Role / Timing Role: 16-bit multichannel ADC with per-channel auto-calibration and zero-latency output for real-time closed-loop control. Use Value: Delivers validated first-sample accuracy after channel change, enabling deterministic sampling intervals without guard-band delays. |
| Portable Instrumentation | Energy Metering Front-End |
Use Scenario: Battery-powered handheld multimeters and calibration standards requiring ultra-low power and high DC accuracy. IC Role / Device Role / Timing Role: Low-power delta-sigma ADC operating at 160 µA active current and 1 µA sleep current, with integrated oscillator. Use Value: Achieves 0.00003% linearity and 1 µV offset while consuming < 0.8 mW at 5 V, extending battery life without sacrificing precision. |
Use Scenario: Anti-tampering energy meters measuring voltage/current transformers with harmonic immunity. IC Role / Device Role / Timing Role: High-accuracy ADC rejecting 50/60 Hz interference and harmonics while digitizing isolated CT/PT outputs. Use Value: Built-in simultaneous 50 Hz/60 Hz rejection ensures metrology-grade accuracy without external notch filters or DSP post-processing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS124S08IPBSR | 24-bit resolution, SPI interface, no integrated oscillator, 4.5 V min supply | Higher resolution but lacks I²C compatibility and simultaneous 50/60 Hz rejection | Choose when 24-bit resolution and SPI integration outweigh I²C convenience and built-in line rejection. |
| MAX11206ETL+ | 24-bit, SPI, internal reference, 2.7 V to 3.6 V only, no Easy Drive | Lower supply range; requires external buffering for high-Z sensors; no automatic line-frequency rejection | Prefer for ultra-low-voltage battery systems where 24-bit resolution compensates for lack of Easy Drive and line rejection. |
Compared with ADS124S08IPBSR and MAX11206ETL+, the LTC2497IUHF#PBF uniquely combines I²C simplicity, zero-differential-input-current operation, and hardware-based dual-line-frequency rejection in a single 38-lead QFN - making it optimal for space-constrained industrial DAQ where sensor interface robustness and EMI resilience are critical.
Availability
LTC2497IUHF#PBF is available at Aetrix Electronics and suitable for industrial process control, portable instrumentation, energy metering, and multi-sensor data acquisition requiring stable component supply across extended temperature ranges.
Supply support for LTC2497IUHF#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 LTC2497IUHF#PBF belongs to Linear's precision delta-sigma ADC product line, engineered for direct sensor digitization in harsh industrial environments where accuracy, stability, and ease of interface are paramount.
FAQ
What is the operating temperature range for the LTC2497IUHF#PBF?
The LTC2497IUHF#PBF is rated for –40°C to +85°C, qualifying it for extended industrial applications. This grade ('I') differs from the 'C' grade (0°C to 70°C) and is explicitly confirmed in the Order Information table of the official datasheet. All electrical specifications labeled with 'l' apply across this full range.
Does the LTC2497IUHF#PBF require external amplifiers for high-impedance sensors?
No - the LTC2497IUHF#PBF uses Easy Drive technology to cancel differential input current automatically, enabling direct connection of high-impedance sensors (e.g., RTDs, thermistors) without external buffers. Its 11 pF input capacitance and <10 nA leakage current preserve DC accuracy even with source impedances up to 100 kΩ.
How does the LTC2497IUHF#PBF achieve simultaneous 50 Hz and 60 Hz rejection?
The LTC2497IUHF#PBF implements hardware-level notch filtering via its internal digital filter architecture, tuned to reject both 50 Hz and 60 Hz line frequencies simultaneously - confirmed in the Features list and Electrical Characteristics table under "Input Normal Mode Rejection 50Hz/60Hz ±2%" (87 dB min). No firmware or external components are needed.
What is the function of the fO pin on the LTC2497IUHF#PBF?
The fO pin controls the conversion clock source: grounding fO selects the internal 307.2 kHz oscillator; applying an external clock enables programmable data rates and adjustable notch frequency. This is documented in the Pin Functions section and Electrical Characteristics table under "fEOSC" (10–1000 kHz range).
Can the LTC2497IUHF#PBF operate with a 2.7 V supply and 2.5 V reference?
Yes - the LTC2497IUHF#PBF supports VCC from 2.7 V to 5.5 V and VREF from 0.1 V to VCC. Datasheet Electrical Characteristics confirm full performance (e.g., 2 ppm INL, 15 ppm total unadjusted error) at VCC = 2.7 V and VREF = 2.5 V, with specified behavior across temperature.
LTC2497IUHF#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:
- -40°C ~ 85°C
- Supplier Device Package:
- 38-QFN (5x7)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
LTC2497IUHF#PBF FAQ
1.How can I place an order for LTC2497IUHF#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2497IUHF#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 LTC2497IUHF#PBF reliable?
The price and inventory of LTC2497IUHF#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2497IUHF#PBF is usually 5 days.
3.What payment methods are accepted for LTC2497IUHF#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2497IUHF#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2497IUHF#PBF?
LTC2497IUHF#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2497IUHF#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 LTC2497IUHF#PBF?
For technical support, including LTC2497IUHF#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2497IUHF#PBF requirements.
6.How does Aetrix verify that LTC2497IUHF#PBF is sourced from the original manufacturer or authorized distributors?
All LTC2497IUHF#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 LTC2497IUHF#PBF meets industry standards.
7.What is the process for return or replacement of LTC2497IUHF#PBF?
All LTC2497IUHF#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2497IUHF#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 LTC2497IUHF#PBF part is unused and in its original packaging.
Return procedure for LTC2497IUHF#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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