Texas Instruments OPA683ID

Overview

OPA683ID from Texas Instruments is a very low-power, current-feedback operational amplifier with disable control, designed for high-speed analog signal conditioning in space- and power-constrained systems. It delivers 150MHz bandwidth at G = +2, –69dBc harmonic distortion at 5MHz, and 110mA output drive on ±5V supplies - enabling use in broadcast video drivers, ADC input stages, and SAW filter post-amplifiers.

For engineers reviewing the OPA683ID datasheet, OPA683ID pinout, OPA683ID application, or OPA683ID equivalent, key selection considerations include its CFBplus architecture for gain-stable bandwidth, 0.94mA quiescent current, 100µA shutdown mode, SOT-23-6 package footprint, and dual/±5V or single/+5V supply flexibility.

Technical Context

The OPA683ID implements a CFBplus architecture featuring an internally closed-loop input buffer stage that linearizes inverting-input impedance, enabling exceptional bandwidth retention up to G = +100 and reduced distortion versus earlier low-power CFB amplifiers. Its transimpedance gain (Z_OL) exceeds 700kΩ at 25°C, supporting stable operation with feedback resistors ≥1.2kΩ.

It supports both inverting (G = –1 to –24) and noninverting (G = +1 to +100) configurations with minimal peaking (<8dB at G = +1), and includes a dedicated DIS pin that places I/O into high-impedance state while reducing supply current to <100µA - critical for battery-powered or duty-cycled systems.

Key Specifications

Pinout & Package

SOT-23-6 package (DBV), 2.9mm × 1.6mm footprint, 0.95mm height, thermal resistance θ_JA = 150°C/W. Pin 1 marked with dot; top view orientation per TI datasheet SBOS221E.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar current-feedback amplifier applications.

Compared with OPA683ID, OPA684IDBVT trades 46% higher supply current for 6dB lower distortion and 2× slew rate - ideal for high-fidelity IF stages; OPA2683IDGKT retains identical per-channel specs in dual configuration but increases board area by 40% - optimal for I/Q or stereo signal paths.

Availability

OPA683ID is available at Aetrix Electronics and suitable for professional broadcast video drivers, ADC input conditioning, SAW filter post-amplification, and short-loop ADSL line drivers requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

Supply support for OPA683ID 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 connectivity technologies, with decades of innovation in high-performance op amps and signal chain solutions.

The OPA683ID belongs to TI's CFBplus current-feedback op amp product line, engineered specifically for ultra-low-power, wideband analog signal conditioning in broadcast, communications, and test equipment where gain stability, low distortion, and shutdown capability are critical.

FAQ

What supply voltage ranges does the OPA683ID support?

The OPA683ID operates from ±2.5V to ±6V dual supplies or +2.8V to +12V single supply. At ±5V, it delivers full 150MHz bandwidth and ±4VPP output swing; at +5V single supply, bandwidth reduces to 119MHz but retains functional operation with 3VPP output into AC-coupled loads. Minimum operating voltage is strictly +2.8V - below this, output swing and slew rate degrade significantly.

How does the OPA683ID's CFBplus architecture improve upon standard current-feedback op amps?

The OPA683ID's CFBplus architecture integrates a closed-loop input buffer that linearizes the inverting-input impedance to ~4.5Ω across frequency and gain settings. This eliminates the gain-dependent bandwidth roll-off and harmonic distortion seen in conventional CFB amplifiers, enabling stable 121MHz bandwidth even at G = +5 and <–69dBc distortion at 5MHz - performance previously unattainable below 1mA quiescent current.

What is the function and timing behavior of the DIS pin on the OPA683ID?

The DIS pin on the OPA683ID is an active-low disable control: pulled HIGH or left open, the device operates normally; pulled LOW (<1.5V), it enters shutdown mode with supply current dropping to 100µA and all I/O pins entering high-impedance state. Enable time is 40ns, disable time is 60ms - optimized for burst-mode or duty-cycled applications where rapid wake-up is required but deep sleep minimizes average power.

Can the OPA683ID drive a 100Ω load with full output swing?

Yes - the OPA683ID delivers ±4VPP into a 100Ω load on ±5V supplies, confirmed by output current specifications (150mA sourcing, –110mA sinking minimum). This capability supports doubly terminated 50Ω video lines and broadband communication interfaces. For sustained operation, thermal derating must be applied: at ambient >70°C, output current is limited to 120mA to maintain junction temperature <125°C in the SOT-23-6 package.

What are the recommended feedback resistor values for stable operation of the OPA683ID?

Texas Instruments specifies RF = 1.2kΩ for ±5V operation and RF = 1.4kΩ for +5V single-supply operation to achieve flat frequency response at G = +2. Deviating from these values introduces peaking: at RF = 1kΩ, gain peaking reaches 8.0dB; at RF = 2kΩ, bandwidth drops >30%. RG is set independently to define gain (e.g., RG = 1.2kΩ for G = +2), and must remain ≥50Ω to avoid instability.