Analog Devices Inc. OP249GP

Overview

OP249GP from Analog Devices is a precision dual JFET-input operational amplifier optimized for high-speed, low-distortion signal conditioning. It delivers 22 V/µs typical slew rate, ≤1.2 µs settling time to 0.01%, and 200 µV typical input offset voltage - enabling accurate amplification in fast DAC output stages and professional audio buffers.

For engineers reviewing the OP249GP datasheet, OP249GP pinout, OP249GP application, or OP249GP equivalent, key selection criteria include symmetric slew behavior under 600 Ω load, ultralow THD (0.002% typ), and guaranteed open-loop gain ≥1000 V/mV - all critical for 12-bit DAC linearity and servo control stability.

Technical Context

The OP249GP implements a matched dual JFET input stage with symmetrical positive/negative slew limiting, eliminating net DC offset in servo and audio applications. Its high open-loop gain (≥1000 V/mV) and low input bias current (30 pA typ) preserve dc accuracy while supporting wideband closed-loop configurations up to 4.7 MHz GBW.

Designed for unity-gain stability, it drives capacitive loads up to 500 pF without oscillation and maintains <0.1% overshoot at 2 kΩ//100 pF. The output stage delivers ±12 V swing into 2 kΩ and sustains ±36 mA short-circuit current - enabling robust interfacing with ADC inputs and active filters.

Key Specifications

Pinout & Package

OP249GP is supplied in an 8-lead PDIP (N-8) package per JEDEC MS-001, with 0.300-inch body width and 0.100-inch lead pitch. Thermal resistance θ_JA = 96°C/W (socket-mounted).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual JFET op amp applications.

Compared with AD823ARZ and TL072CP, OP249GP uniquely balances JFET input ruggedness, symmetric slew under heavy load, and guaranteed 0.01% settling - making it the only option among the three qualified for metrology-grade DAC output stages and professional audio line drivers.

Availability

OP249GP is available at Aetrix Electronics and suitable for high-speed data acquisition, professional audio equipment, precision instrumentation, and industrial servo control requiring stable component supply across extended temperature ranges.

Supply support for OP249GP 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The OP249GP belongs to Analog Devices' precision JFET op amp product line, engineered specifically for applications demanding simultaneous high speed, low distortion, and dc accuracy - such as DAC output stages, audio buffers, and servo error amplifiers.

FAQ

What is the maximum capacitive load the OP249GP can drive without compensation?

The OP249GP is unity-gain stable and can drive up to 500 pF capacitive load without external compensation while maintaining <0.1% overshoot. This capability is verified in Figure 12 of the OP249GP datasheet, which shows stable slew rate performance across 0–500 pF. For loads exceeding 500 pF or demanding minimal phase margin degradation, a small series resistor (e.g., 10–50 Ω) between output and capacitance is recommended. OP249GP's robust output stage ensures this stability holds across its full operating temperature range.

Does the OP249GP support single-supply operation?

The OP249GP is specified for dual-supply operation from ±4.5 V to ±18 V and does not support true single-supply operation. Its input common-mode range extends to ±11 V (with ±15 V supplies), but the inputs cannot swing to the negative rail - limiting use in rail-to-rail single-ended configurations. While it may function with asymmetric supplies (e.g., +15 V/0 V), output swing becomes severely asymmetrical and input bias current increases significantly below –2 V. For single-supply designs, consider purpose-built rail-to-rail op amps like the AD8605. OP249GP's architecture is optimized for bipolar precision applications.

How does the OP249GP's symmetric slew rate improve servo system performance?

OP249GP's symmetric slew rate eliminates net DC offset accumulation during repeated direction reversals in servo position loops. Unlike conventional JFET op amps with asymmetric positive/negative slew, OP249GP's matched response prevents harmonic distortion and residual voltage errors that cause thermal drift and positional inaccuracy over time. This is confirmed by Figure 41 in the OP249GP datasheet, which directly compares its linear transient response against LT1057. In practice, this symmetry allows OP249GP-based servo amplifiers to maintain <1 LSB error over 10,000+ cycle life tests - a critical advantage for industrial motion control where OP249GP serves as the core error amplifier.

Can the OP249GP replace the OP27 in dual-channel applications?

No - the OP27 is a single-channel precision op amp, while OP249GP is a dual-channel device with different architecture and specifications. Direct replacement requires circuit redesign: OP249GP offers higher slew rate (22 V/µs vs. 2.8 V/µs) and faster settling (≤1.2 µs vs. 4.5 µs), but lower open-loop gain (1000 V/mV vs. 2000 V/mV) and higher input bias current (30 pA vs. 10 nA). For dual-channel needs previously met by two OP27s, OP249GP reduces board space and power (7 mA vs. 2 × 4.5 mA), but requires verification of gain accuracy and noise performance in high-closed-loop-gain stages. OP249GP is not a drop-in substitute for OP27.

What decoupling is required for optimal OP249GP high-frequency performance?

Optimal OP249GP performance requires local decoupling at each supply pin: a 0.1 µF ceramic capacitor (X7R, 0805) placed ≤2 mm from the pin to ground, plus a 10 µF tantalum or aluminum electrolytic capacitor shared between both supplies. This dual-capacitor approach suppresses high-frequency noise (0.1 µF) and low-frequency supply sag (10 µF), as explicitly recommended in the OP249GP Applications Information section. Layout best practices include short, direct traces to ground plane and avoiding shared return paths. Failure to implement this decoupling degrades PSRR by >20 dB above 100 kHz and increases settling time by up to 300 ns - directly impacting OP249GP's 0.01% specification.