Analog Devices Inc. OP297EZ

Product Summary Analog Devices OP297EZ Dual Precision Op-Amp

The OP297EZ from Analog Devices is a dual-channel, general-purpose precision operational amplifier (op amp) designed for demanding analog signal conditioning tasks. Packaged in an industry-standard 8-lead Ceramic Dual In-line Package (CERDIP), the OP297EZ brings together extremely low input offset voltage, low input bias current, and low power consumption within a convenient through-hole component footprint. Its wide operating voltage range and robust electrical performance make it a workhorse for precision instrumentation, measurement, and control applications where long-term reliability and accuracy are paramount.

Main Benefits and Features of the OP297EZ

The OP297EZ distinguishes itself with a combination of low offset voltage, low drift, and ultra-low input bias currents—features critical to high-performance analog front ends:

Maximum input offset voltage of 50 µV, ensuring minimal DC error for highly accurate signal amplification.

Offset voltage drift limited to 0.6 µV/°C, supporting stable operation over wide temperature variations.

Input bias current below 100 pA at room temperature, maintained across the specified temperature range due to a super-beta input stage with bias current cancellation. This is especially valuable in interfacing with high-impedance sensors and sources.

Outstanding open-loop gain of at least 2000 V/mV guarantees exceptional linearity in closed-loop applications.

High common-mode rejection ratio (CMRR) of at least 120 dB—essential when rejecting unwanted signals in differential configurations or battery-powered systems.

Very low supply current per amplifier (under 625 μA) makes the OP297EZ suitable for low-power designs.

The device supports single or dual supplies from ±2 V up to ±20 V, maximizing flexibility for both traditional and modern analog systems.

These parameters position the OP297EZ as a precision amplifier optimized for accurate, reliable, and low-noise amplification in diverse engineering contexts.

OP297EZ Electrical Characteristics and Performance Metrics

A closer examination of the OP297EZ’s electrical parameters confirms its suitability for precision analog engineering:

Offset voltage: typical 25 µV (max 50 µV at 25°C)

Average long-term input voltage stability: 0.1 µV/month

Input offset current: typ 20 pA, max 100 pA

Input bias current: typ +20 pA, max ±100 pA at 25°C; remains under 450 pA across extended (−40°C to +85°C) temperature range

Input resistance: Differential mode 30 MΩ, Common-mode 500 GΩ

Large signal voltage gain: Typ 4000 V/mV, min 2000 V/mV (25°C, RL ≥ 2 kΩ)

Input voltage range: ±13 V (min), ±14 V (typ) for Vs = ±15 V

Output voltage swing: ±13 V (min) with RL = 10 kΩ

Power supply rejection ratio (PSRR): min 120 dB, typ 130 dB

Channel separation: typ 150 dB at 10 Hz

Gain-bandwidth product: typ 500 kHz

Slew rate: typ 0.15 V/μs

These characteristics ensure the OP297EZ can amplify low-level precision signals without significant influence from drift, bias current, or external supply fluctuations.

OP297EZ Packaging, Installation, and Environmental Details

The OP297EZ is housed in an 8-lead CERDIP (0.300", 7.62 mm pitch), optimized for robust through-hole mounting in standard PCBs. This package offers solid thermal and mechanical reliability.

Operational temperature ratings cover −40°C to +85°C, supporting industrial-grade environments. The device is RoHS 3 compliant and classified as moisture sensitivity level (MSL) 1, denoting high reliability in storage and reflow processes.

Absolute maximum ratings include:

Supply voltage: ±20 V

Input voltage: ±20 V (not exceeding supply rails)

Differential input voltage: 40 V

Output short-circuit duration: indefinite

Storage temperature: −65°C to +175°C (for the CERDIP package)

A silicon junction temperature up to +175°C is accommodated. ESD protection features are present, but standard ESD precautions apply during handling and assembly.

Common Uses and Application Scenarios for the OP297EZ

The performance profile of the OP297EZ targets a variety of precision analog signal conditioning roles:

Strain gage and bridge amplifiers—enabling accurate, low-drift sensor interface circuitry for industrial measurement and feedback systems.

Thermocouple and instrumentation amplifiers, where low offset and bias current are pivotal for low-level signal fidelity.

Photodiode and photocurrent monitors—where picoampere-level bias current is essential to prevent signal corruption.

Long-term integrators, filters, and high-gain linearity amplifier circuits used in precision analog computation.

Sample-and-hold amplifiers, peak detectors, and logarithmic amplifiers that require stability and low noise.

Battery-operated measurement instruments, benefiting from the OP297EZ’s low supply current and high PSRR.

Well-suited to laboratory, field-instrumentation, and industrial process control, the OP297EZ ensures accuracy and stability where every microvolt counts.

Technical Perspectives OP297EZ Performance in Practical Circuit Designs

Several engineering considerations underscore the OP297EZ’s practical suitability:

The device’s super-beta input stage with bias current cancellation provides significantly better input bias current stability over temperature compared to conventional FET-input op amps—ensuring long-term consistency in high-impedance circuits.

Common-mode rejection and power supply rejection, both exceeding 120 dB, are critical in noisy environments or applications dependent on battery supplies, such as portable loggers.

The ability to operate at supply voltages as low as ±2 V means the OP297EZ is compatible with modern low-voltage analog and mixed-signal systems, as well as legacy ±15 V installations.

Output drive is sufficient for most high-impedance loads, evidenced by the large output voltage swing near the rail even at heavy loading.

For system engineers and PCB designers, the OP297EZ’s low total supply current and immunity to short-circuit output conditions further broaden its applicability in dense or power-sensitive analog modules.

Alternative or Substitute Models for the OP297EZ

For applications where sourcing flexibility, supply chain resilience, or performance tradeoffs are required, the following Analog Devices models and family members are noteworthy:

OP97: A single-channel version offering similar precision parameters for applications that require only one op amp per package.

OP497: The quad-channel version, beneficial for multi-channel analog front ends, conserving board space and reducing cost per amplifier in high-density layouts.

Selection engineers should compare detailed data sheet specifications, package options, and application notes when considering potential substitutions, especially in legacy or certified systems. If alternative vendors or cross-references are required, verify specifications such as input offset voltage, input bias current, slew rate, and supply range for compatibility with critical design requirements.

Conclusion

The OP297EZ dual precision operational amplifier from Analog Devices is a highly capable, robust, and flexible solution for engineers demanding exceptional accuracy, minimal bias currents, and long-term stability in analog signal processing. Its industry-standard package, wide supply voltage range, and comprehensive set of precision features make it a prime candidate for instrumentation, sensing, and control applications across industrial, laboratory, and portable platforms. By combining outstanding technical performance with ease of integration, the OP297EZ remains a critical component for analog system designers seeking reliability and precision in every signal chain.