Analog Devices Inc. LTC2497CUHF#PBF

Summary of the LTC2497CUHF#PBF 16-bit Sigma-Delta Analog-to-Digital Converter

The LTC2497CUHF#PBF from Analog Devices Inc. is a high-performance, 16-bit analog-to-digital converter (ADC) based on a sigma-delta (Σ-Δ) architecture. Designed for measurement and data acquisition systems requiring multiple input channels and high accuracy, this ADC integrates an on-chip multiplexer, Easy Drive input technology, and a two-wire I²C interface. It operates from a single supply voltage ranging from 2.7V to 5.5V and comes in a 38-lead QFN package measuring 5 mm × 7 mm. Supporting up to 16 single-ended or 8 differential analog inputs, the LTC2497CUHF#PBF is an attractive choice for applications involving instrumentation, industrial process control, and direct sensor digitization.

Highlights and Core Technology of the LTC2497CUHF#PBF

Engineers evaluating the LTC2497CUHF#PBF will find that its unique combination of features is tailored to demanding signal conversion environments:

Integrated 16-channel multiplexer supporting both single-ended and differential input configurations, offering maximum flexibility in sensor interfacing.

Easy Drive™ input current cancellation technology that eliminates the dynamic input current errors commonly associated with buffered inputs. This capability enables accurate digitization of high-impedance sensor outputs and rail-to-rail voltage swings.

No latency delta-sigma operation: The LTC2497CUHF#PBF’s digital filter settles outputs instantly, even after switching analog channels, minimizing conversion overhead and simplifying system-level calibration routines.

Simultaneous rejection of line frequencies (50 Hz/60 Hz) enhances immunity to environmental noise sources—a critical asset in industrial and process automation applications.

Integrated oscillator supporting internal timing or optional external clock synchronization.

Electrical Specifications and Data Conversion Capabilities of the LTC2497CUHF#PBF

The LTC2497CUHF#PBF delivers exceptional DC and dynamic performance:

16-bit resolution with no missing codes ensures faithful signal representation across the converter’s input range.

Integral nonlinearity (INL) is specified at 2 ppm, supporting high-precision measurement requirements.

Offset and full-scale errors (1 ppm offset, 15–32 ppm full-scale) are minimized, and error drift over temperature and supply variations is tightly controlled, with typical values of 0.1 ppm/°C.

Output noise is extremely low, with a specified 600 nV RMS, facilitating applications requiring high signal integrity.

Input common mode and reference rejection levels exceed 120 dB, providing stability in electrically noisy environments.

Analog Inputs, Reference System, and Multiplexer Design in the LTC2497CUHF#PBF

A distinguishing characteristic of the LTC2497CUHF#PBF is its analog input system:

Supports 8 differential or 16 single-ended input channels, selectable via the internal MUX controlled by the user.

Accepts rail-to-rail analog input and reference voltages, with a common mode range from ground to Vcc, enhancing compatibility with a broad range of sensors and signal sources.

Large input source impedance tolerance, made possible by Easy Drive technology, allows direct digitization of high-impedance sensors without introducing significant errors.

External reference support enables scalable voltage ranges and input sensitivities based on system requirements.

Access to the multiplexer output permits external amplification or calibration stages to be shared among multiple channels.

Digital Communication Setup and Timing Details for the LTC2497CUHF#PBF

The LTC2497CUHF#PBF features a standard two-wire I²C serial interface:

Operates up to 400 kHz SCL clock frequency, suitable for high-throughput data acquisition.

Supports 27 unique I²C addresses, as well as a global synchronization address, facilitating multi-device installations and coordinated system operation.

Address pins (CA0, CA1, CA2) are configurable for device identification and floating states.

All digital I/O are tolerant from 0.3 Vcc to 0.7 Vcc threshold levels, and support robust logic interfacing.

Power Consumption and Heat Dissipation Features of the LTC2497CUHF#PBF

Careful attention to power and thermal design is essential for reliable, long-term operation:

Operates from a single supply rail between 2.7V and 5.5V, allowing integration in low-voltage designs and battery-powered devices.

Typical supply current during conversion is 160–275 μA, with sleep mode current as low as 1–2 μA, supporting energy-sensitive applications.

Conversion times with the internal oscillator are tightly defined, supporting precise timing scheduling for multiplexed measurements.

The package features an exposed pad to optimize thermal dissipation—this pad must be soldered to the PCB for proper heat flow management.

Physical Packaging, Mounting Solutions, and Environmental Standards for the LTC2497CUHF#PBF

Physical integration and regulatory compliance considerations for the LTC2497CUHF#PBF include:

Delivered in a 38-lead plastic QFN (Quad Flat No-Lead) package, measuring 5 mm × 7 mm, ideal for compact PCB layouts.

Designed for surface-mount installation, facilitating automated assembly and minimizing mechanical stresses.

RoHS3 compliance ensures suitability for markets requiring environmental safety in materials.

Moisture Sensitivity Level (MSL) 1 assures unlimited floor life under standard conditions.

REACH unaffected and ECCN EAR99 classification provide confidence for global procurement flows.

Common Engineering Use Cases for the LTC2497CUHF#PBF

Engineers have deployed the LTC2497CUHF#PBF in a variety of high-value applications:

Direct sensor digitization for temperature probes, bridge circuits, or other analog transducers, especially where high impedance and signal variability are concerns.

Instrumentation requiring rapid channel switching and zero conversion latency, such as automated test systems and data loggers.

Industrial process control setups that rely on simultaneous 50 Hz/60 Hz rejection to maintain measurement stability in environments with heavy AC power interference.

Designs calling for flexible analog front-end architectures, including shared amplifiers and automatic offset/drift calibration through the integrated multiplexer output access.

Alternative or Substitute Models for the LTC2497CUHF#PBF

When considering alternatives for the LTC2497CUHF#PBF, engineers might evaluate:

Analog Devices LTC2499 series, which offers similar Easy Drive technology but expanded channel counts.

Texas Instruments ADS1115 and ADS1158, which also provide multi-channel, high-resolution sigma-delta ADC functionality compatible with I²C interface.

Maxim Integrated MAX11270/11271 series, offering competitive data conversion precision and multiplexed analog input support.

When selecting replacements, it’s vital to examine channel configuration, input impedance, noise specifications, and protocol compatibility to ensure seamless integration into existing system architectures.

Conclusion

The LTC2497CUHF#PBF by Analog Devices stands out as a robust solution for high-precision, multi-channel signal digitization tasks across instrumentation, automation, and sensor measurement domains. Its combination of advanced sigma-delta conversion, Easy Drive input architecture, flexible I²C interface, and sound environmental credentials ensure that engineers and procurement professionals can make informed, confident decisions for their system requirements. With alternatives available and a wide array of real-world applications, the LTC2497CUHF#PBF remains a benchmark component in precision analog-to-digital conversion technology.