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Analog Devices Inc. LTC2497CUHF#TRPBF
- Part No.:
- LTC2497CUHF#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 38-WFQFN Exposed Pad
- Datasheet:
-
LTC2497CUHF#TRPBF.pdf
- Description:
- IC ADC 16BIT SIGMA-DELTA 38QFN
- Quantity:
- Payment:
- Shipping:
Inventory:149
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Product details
Overview
LTC2497CUHF#TRPBF 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, 600 nV RMS noise, and simultaneous 50 Hz/60 Hz rejection - enabling direct digitization of high-impedance sensors in industrial process control systems.
For engineers reviewing the LTC2497CUHF#TRPBF datasheet, LTC2497CUHF#TRPBF pinout, LTC2497CUHF#TRPBF application, or LTC2497CUHF#TRPBF equivalent, key selection criteria include rail-to-rail common-mode input range (GND to VCC), zero differential input current, no-latency single-cycle digital filter settling, and support for external RC filtering without buffer amplifiers.
Technical Context
The LTC2497CUHF#TRPBF 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 external clock (10–1000 kHz), supports 27 I²C addresses plus global sync address, and maintains DC accuracy across –40°C to 85°C via on-chip temperature-compensated reference tracking - all within a single 38-lead 5 mm × 7 mm QFN package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and unambiguous code mapping across full input range. |
| INL | 2 ppm of VREF - enables ±0.00003% linearity error in precision measurement applications. |
| Offset Error | 1 µV typical - eliminates need for system-level zero-point calibration in sensor front ends. |
| Noise (RMS) | 600 nV RMS - corresponds to 0.02 LSB transition noise at 5 V reference, supporting sub-microvolt signal resolution. |
| Common-Mode Range | GND to VCC - allows direct interfacing to sensors operating outside supply rails (±0.3 V beyond rails permitted). |
| Power Supply | 2.7 V to 5.5 V - supports battery-powered and industrial 3.3 V/5 V systems with 160 µA active current. |
| Rejection | Simultaneous 50 Hz/60 Hz - achieves ≥87 dB normal-mode rejection without external notch filters or software averaging. |
Pinout & Package
Package: 38-lead plastic QFN (5 mm × 7 mm), exposed pad (Pin 39) required to be soldered 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 minimize ground bounce during conversion. |
| SCL (Pin 2) | I²C serial clock input | Slave-only interface; accepts up to 400 kHz clock for standard/fast-mode operation with defined timing margins. |
| SDA (Pin 3) | Bidirectional I²C data line | Open-drain output requiring external pull-up; transmits 24-bit conversion result or receives channel select commands. |
| COM (Pin 7) | Common negative input for single-ended mode | Enables 16 single-ended channels by serving as shared IN– reference for CH0–CH15. |
| CH0–CH15 (Pins 8–23) | Analog multiplexer inputs | Configurable as 16 single-ended or 8 differential pairs; each pair supports rail-to-rail input voltage (GND–0.3 V to VCC+0.3 V). |
| MUXOUTP/N (Pins 24,27) | Multiplexer output terminals | Provide buffered analog outputs for optional external amplification; enable sharing of one amplifier across all channels. |
| ADCINP/N (Pins 25,26) | Delta-sigma modulator inputs | Accept conditioned signals from MUXOUT or direct connection; designed for low-input-current operation with Easy Drive cancellation. |
| REF+/REF– (Pins 29,30) | Differential reference inputs | Support 0.1 V to VCC reference span; common-mode range matches supply (GND to VCC), enabling flexible reference sourcing. |
| fO (Pin 35) | Oscillator control input | Logic-low selects internal 307.2 kHz clock; external square wave overrides for custom data rates and filter null placement. |
| CA0–CA2 (Pins 36–38) | I²C address configuration | Three-state (LOW/HIGH/FLOAT) pins set 3-bit address; support 27 unique device addresses on shared bus. |
Key Features
| Feature | Design Value |
|---|---|
| No Latency Delta-Sigma 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 connection to high-Z sources (e.g., thermistors, RTDs, pH electrodes) without buffer-induced errors. |
| Auto-Calibration Engine | Continuous per-conversion offset and full-scale calibration removes drift from temperature, supply, and channel switching - no user intervention required. |
| Rail-to-Rail Input Common Mode | Input pins accept signals from GND–0.3 V to VCC+0.3 V independent of reference voltage - simplifies sensor biasing and level-shifting. |
| Simultaneous 50/60 Hz Rejection | Hardware-based rejection ≥87 dB at both frequencies - eliminates need for firmware-based digital filtering or dual-sampling schemes. |
Applications
| Industrial Process Monitoring | High-Impedance Sensor Digitization |
|---|---|
Use Scenario: Continuous monitoring of temperature, pressure, and flow in PLC-controlled factory lines with 4–20 mA loop integration. IC Role / Device Role / Timing Role: Primary ADC for analog input modules, performing synchronized multi-channel sampling with deterministic latency. Use Value: Simultaneous 50/60 Hz rejection ensures stable readings in electrically noisy plant environments without external filtering components. | Use Scenario: Direct digitization of thermistor networks and strain gauge bridges in portable instrumentation where board space and power are constrained. IC Role / Device Role / Timing Role: Front-end sensor digitizer with integrated Easy Drive cancellation, replacing op-amp buffers and reducing BOM count. Use Value: Zero differential input current allows use of 100 kΩ source impedances while maintaining 16-bit accuracy - eliminating buffer offset and noise contributions. |
| Programmable Logic Controller (PLC) Analog Input | Environmental Data Acquisition |
Use Scenario: Modular I/O cards in DIN-rail mounted PLCs acquiring voltage/current inputs from field transmitters. IC Role / Device Role / Timing Role: Channel-multiplexed ADC with auto-calibration, providing calibrated 16-bit results over –40°C to 85°C operating range. Use Value: GND-to-VCC common-mode input range enables direct interface to isolated field-side signals without level-shifting circuitry. | Use Scenario: Battery-powered environmental sensors measuring air quality, humidity, and CO₂ using electrochemical and capacitive transducers. IC Role / Device Role / Timing Role: Low-power ADC subsystem operating in sleep mode (1 µA) between conversions, triggered by I²C host. Use Value: 160 µA active current and automatic power-down reduce average system power - extending battery life in wireless sensor nodes. |
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, requires external clock; higher noise (1.2 µV RMS) but better INL (0.5 ppm). | Targeted at higher-resolution metrology; lacks simultaneous 50/60 Hz rejection and I²C simplicity. | Choose when 24-bit resolution and SPI compatibility outweigh ease-of-use and built-in rejection features. |
| MAX11206ETX+ | 24-bit sigma-delta ADC, I²C interface, 12-channel (6 diff), 1.5 µV RMS noise, no Easy Drive architecture. | Requires external op-amps for high-Z sensors; lower channel count limits scalability in dense I/O modules. | Prefer when ultra-low noise is critical and sensor source impedance is <1 kΩ, avoiding input current cancellation needs. |
Compared with ADS124S08IPBSR and MAX11206ETX+, the LTC2497CUHF#TRPBF uniquely combines 16-bit precision, zero-differential-input-current operation, simultaneous 50/60 Hz rejection, and I²C simplicity in a single 38-pin QFN - making it optimal for cost-sensitive, space-constrained industrial sensor nodes requiring robust AC-line immunity.
Availability
LTC2497CUHF#TRPBF is available at Aetrix Electronics and suitable for industrial process control, programmable logic controller (PLC) analog input modules, and high-impedance sensor digitization requiring stable component supply and long-term production continuity.
Supply support for LTC2497CUHF#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, serving industrial, automotive, communications, and healthcare markets.
The LTC2497CUHF#TRPBF belongs to ADI's precision delta-sigma ADC product line, engineered specifically for direct sensor digitization in electrically noisy, thermally variable industrial environments - emphasizing ease of use, rail-to-rail flexibility, and inherent AC-line immunity.
FAQ
What is the operating temperature range for the LTC2497CUHF#TRPBF?
The LTC2497CUHF#TRPBF is rated for 0°C to 70°C ambient operation (Commercial grade). This is confirmed by the "U" suffix in the part number and the Order Information table specifying "0°C to 70°C" for LTC2497CUHF variants. The device meets all electrical specifications across this full range without derating.
Does the LTC2497CUHF#TRPBF require external clocking or does it have an internal oscillator?
The LTC2497CUHF#TRPBF includes an integrated oscillator. When fO (Pin 35) is tied to GND, it uses its internal 307.2 kHz clock. An external clock (10–1000 kHz) may be applied to fO to override the internal oscillator - enabling custom data rates and filter null positioning. No external crystal or oscillator is required for basic operation.
How many I²C addresses does the LTC2497CUHF#TRPBF support?
The LTC2497CUHF#TRPBF supports 27 unique I²C addresses via three configurable address pins (CA0, CA1, CA2), each accepting LOW, HIGH, or FLOAT states. It also provides one global address for synchronized read operations across multiple devices on the same bus - enabling coordinated multi-ADC acquisition without individual addressing overhead.
Can the LTC2497CUHF#TRPBF measure single-ended signals?
Yes, the LTC2497CUHF#TRPBF supports both differential and single-ended configurations. In single-ended mode, COM (Pin 7) serves as the common negative input for all 16 channels (CH0–CH15), allowing 16 independent single-ended measurements. The input common-mode range remains GND to VCC, and full 16-bit accuracy is maintained.
What is the purpose of the MUXOUTP/MUXOUTN and ADCINP/ADCINN pins on the LTC2497CUHF#TRPBF?
The MUXOUTP/N pins provide access to the analog multiplexer output before the ADC stage, while ADCINP/N are the delta-sigma modulator inputs. They can be shorted for direct digitization or used to insert an external amplifier - which the LTC2497CUHF#TRPBF automatically calibrates for offset and drift, preserving system accuracy without manual compensation.
LTC2497CUHF#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:
- 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#TRPBF FAQ
1.How can I place an order for LTC2497CUHF#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC2497CUHF#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 LTC2497CUHF#TRPBF reliable?
The price and inventory of LTC2497CUHF#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC2497CUHF#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC2497CUHF#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC2497CUHF#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC2497CUHF#TRPBF?
LTC2497CUHF#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC2497CUHF#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 LTC2497CUHF#TRPBF?
For technical support, including LTC2497CUHF#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC2497CUHF#TRPBF requirements.
6.How does Aetrix verify that LTC2497CUHF#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC2497CUHF#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 LTC2497CUHF#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC2497CUHF#TRPBF?
All LTC2497CUHF#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC2497CUHF#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 LTC2497CUHF#TRPBF part is unused and in its original packaging.
Return procedure for LTC2497CUHF#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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