Texas Instruments OPA2690IDG4

Overview

OPA2690IDG4 from Texas Instruments is a dual, wideband, voltage-feedback operational amplifier with disable function, designed for high-speed analog signal conditioning. It delivers 220MHz small-signal bandwidth (G = +2), 1800V/µs slew rate, ±4.0V output swing on ±5V supplies, and supports single-supply operation at +5V with 190mA output current per channel - ideal for ADC input driving in high-resolution data acquisition systems.

For engineers reviewing the OPA2690IDG4 datasheet, OPA2690IDG4 pinout, OPA2690IDG4 application, or OPA2690IDG4 equivalent, key selection criteria include its unity-gain stability, low 5.5mA/ch quiescent current, 2nd/3rd-harmonic distortion below –68dBc at 5MHz, and SO-8 package compatibility with space-constrained video, imaging, and communications front-ends.

Technical Context

The OPA2690IDG4 employs a novel voltage-feedback architecture with a transconductance element placed between two input buffers, enabling 1800V/µs slew rate while maintaining low 5.5mA/ch supply current. Its output stage delivers high current into 100Ω loads with minimal headroom - supporting >150MHz bandwidth on +5V supply with 3V_PP swing.

It features independent disable control per channel (SO-14 only), but the OPA2690IDG4 variant is the SO-8 package without disable pins. Input common-mode range extends to ±3.5V on ±5V supplies, and differential gain/phase error is 0.06%/0.03° for NTSC video, confirming suitability for precision analog signal paths.

Key Specifications

Pinout & Package

OPA2690IDG4 is housed in an 8-pin SOIC (SO-8) package with standard dual op amp pinout and no disable functionality. The package is RoHS-compliant, surface-mountable, and rated for –40°C to +85°C operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed op amp applications.

Compared with OPA2690IDG4, OPA2691ID trades unity-gain stability and lower distortion for higher bandwidth at fixed gain, while LMH6629MA/NOPB offers greater speed and slew at the expense of power efficiency and noise floor - making OPA2690IDG4 optimal for balanced high-fidelity, moderate-power ADC and video applications.

Availability

OPA2690IDG4 is available at Aetrix Electronics and suitable for video line driving, high-speed ADC buffering, and xDSL line driver applications requiring stable component supply, consistent parametric performance, and long-term industrial availability.

Supply support for OPA2690IDG4 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies with decades of op amp innovation.

The OPA2690IDG4 belongs to TI's precision high-speed op amp product line, engineered for demanding signal-chain applications including data acquisition, communications infrastructure, and professional video equipment where bandwidth, linearity, and drive strength are critical.

FAQ

What is the maximum small-signal bandwidth of the OPA2690IDG4 at G = +2?

The OPA2690IDG4 achieves 220MHz small-signal bandwidth at noninverting gain of +2 with ±5V supplies, tested under RL = 100Ω and VO = 0.5V_PP. This bandwidth remains ≥150MHz across the full –40°C to +85°C temperature range, ensuring consistent high-frequency performance in industrial environments. The OPA2690IDG4 maintains this specification without external compensation due to its unity-gain stable architecture.

Does the OPA2690IDG4 support single-supply operation, and what is its output swing on +5V?

Yes, the OPA2690IDG4 supports +5V single-supply operation. With proper ac-coupling and midpoint biasing (e.g., 2.5V common-mode), it delivers a minimum 3V_PP output swing into a 100Ω load referenced to 2.5V - achieving 1.0V to 4.0V output range. This capability makes the OPA2690IDG4 suitable for interfacing with modern single-supply ADCs such as the ADS825 without level-shifting circuitry.

What is the harmonic distortion performance of the OPA2690IDG4 at 5MHz?

At 5MHz, G = +2, and 2V_PP output into 100Ω, the OPA2690IDG4 delivers –68dBc 2nd-harmonic and –70dBc 3rd-harmonic distortion under ±5V supplies. With RL ≥500Ω, distortion improves to –77dBc (2nd) and –81dBc (3rd). These values are measured input-referred and confirm the OPA2690IDG4's suitability for 10-bit+ data converters where spurious-free dynamic range is critical.

Is the OPA2690IDG4 pin-compatible with other packages in the OPA2690 family?

No - the OPA2690IDG4 is the SO-8 package variant and lacks disable pins. The SO-14 version (e.g., OPA2690I-14D) includes DIS A and DIS B pins for channel shutdown, resulting in different pinout and footprint. The OPA2690IDG4 shares the same electrical specifications but cannot be substituted without PCB layout changes. Always verify package drawings before board design or replacement.

What thermal considerations apply to the OPA2690IDG4 in SO-8 package?

The OPA2690IDG4 in SO-8 has a junction-to-ambient thermal resistance (θ_JA) of 125°C/W. At maximum 13.2mA total quiescent current and worst-case 200mW output power dissipation, junction temperature rise can exceed 50°C above ambient - requiring adequate copper pour, airflow, or derating above +70°C. Thermal shutdown is not integrated; safe operation requires external thermal management per TI SBOS238G Section 8.3.