Texas Instruments OPA2890IDGST

Overview

OPA2890IDGST from Texas Instruments is a dual, unity-gain stable, voltage-feedback operational amplifier with disable control, designed for high-speed analog signal conditioning. It delivers 90MHz bandwidth at G = +2V/V, 400V/μs slew rate, ±4.1V output swing on ±5V supplies, and 1.1mA/ch quiescent current - enabling RGB line driving, ADC buffering, and portable instrumentation.

For engineers reviewing the OPA2890IDGST datasheet, OPA2890IDGST pinout, OPA2890IDGST application, or OPA2890IDGST equivalent, key selection criteria include its MSOP-10 package with integrated disable pins, wideband performance under single +5V operation (3VPP output swing), low distortion (–84dBc 2nd harmonic @ 1MHz), and thermal-limited drive capability (±35mA @ RL = 100Ω).

Technical Context

The OPA2890IDGST employs a novel transconductance-based input stage that dynamically increases compensation capacitor charging current with input error voltage - enabling 400V/μs slew rate without proportional quiescent current penalty. This architecture achieves unity-gain stability while delivering full-power bandwidth previously limited to current-feedback amplifiers.

Its dual-channel layout supports independent disable control per channel (DIS A/DIS B), placing outputs in high-impedance state with <30μA/ch supply current. The device maintains DC precision (±2mV offset, 62dB open-loop gain) alongside AC performance, making it suitable for DC-coupled high-speed acquisition paths where gain accuracy and settling time (<16ns to 0.02%) are critical.

Key Specifications

Pinout & Package

OPA2890IDGST is packaged in a thermally enhanced MSOP-10 (DGS) package with exposed thermal pad, rated for –40°C to +85°C operation and θ_JA = 135°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2889IDGST and OPA2690IDGST, the OPA2890IDGST uniquely balances 90MHz bandwidth, 400V/μs slew rate, and per-channel disable in a 1.1mA/ch package - making it the only choice for battery-powered, multi-channel, high-fidelity analog front-ends requiring dynamic power scaling.

Availability

OPA2890IDGST is available at Aetrix Electronics and suitable for video line driving, ADC buffering, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for OPA2890IDGST 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 company specializing in analog and embedded processing technologies, with leadership in high-performance op amps and precision signal chain solutions.

The OPA2890 belongs to TI's high-speed voltage-feedback op amp product line, engineered for applications demanding unity-gain stability, wide bandwidth, and low power - particularly in imaging, communications, and portable test equipment.

FAQ

What supply voltage ranges does the OPA2890IDGST support?

The OPA2890IDGST operates from ±1.5V to ±6V dual supplies or +3V to +12V single supply. At ±5V, it delivers full specified performance including 90MHz bandwidth and 400V/μs slew rate. Its minimum operating voltage is +3V single-ended or ±1.5V dual, enabling use in low-voltage portable systems while maintaining functionality. The maximum absolute rating is ±6.5V supply, beyond which permanent damage may occur.

Does the OPA2890IDGST require external compensation for unity-gain stability?

No, the OPA2890IDGST is internally compensated for unity-gain stability across its full operating temperature range (–40°C to +85°C). It achieves this without external components due to its proprietary transconductance-based input stage architecture. This eliminates the need for feedback capacitors or gain-setting networks in G = +1V/V configurations, simplifying PCB layout and improving reliability in video and instrumentation designs.

How does the disable function work on the OPA2890IDGST?

The OPA2890IDGST features independent disable pins (DIS A and DIS B) on pins 7 and 9 of its MSOP-10 package. Pulling either pin below 0.8V (max) disables the corresponding channel, reducing its supply current to <30μA/ch and placing its output in high-impedance state. The enable threshold is ≥3.0V (min). This function is not available on SO-8 variants (e.g., OPA2890ID), confirming the MSOP-10 package is required for power-gated operation.

What is the maximum output current capability of the OPA2890IDGST?

The OPA2890IDGST delivers ±35mA output current into a 100Ω load at ±5V supplies, with peak short-circuit current of ±75mA. Under no-load conditions, it sustains ±4.1V swing - translating to ±3.9V into 100Ω. These values are characterized over temperature (–40°C to +85°C) and represent guaranteed minimums. Exceeding ±35mA continuously risks thermal shutdown in the MSOP-10 package due to its 135°C/W junction-to-ambient thermal resistance.

Can the OPA2890IDGST be used with a single +5V supply for DC-coupled ADC driving?

Yes, the OPA2890IDGST supports true single +5V operation with DC-coupled inputs and outputs. With proper input biasing (e.g., resistive divider to +2.5V), it delivers a 0.9V to 4.1V output swing - covering 3.2VPP range centered at mid-supply. This matches the input range of many 12- to 16-bit SAR ADCs (e.g., ADS8472) without level-shifting circuitry, preserving signal integrity and reducing component count in data acquisition systems.