Texas Instruments OPA211IDGKR

Overview

OPA211IDGKR from Texas Instruments is a dual-channel, precision operational amplifier optimized for low-noise, high-speed data acquisition and precision instrumentation. It delivers 1.1 nV/√Hz input voltage noise at 1 kHz, 700 ns 16-bit settling time across 10-V output swing, ±2.25 V to ±18 V supply operation, rail-to-rail output, and 27 V/μs slew rate - enabling high-fidelity signal conditioning in ultrasound scanners and semiconductor test equipment.

For engineers reviewing the OPA211IDGKR datasheet, OPA211IDGKR pinout, OPA211IDGKR application, or OPA211IDGKR equivalent, key selection criteria include its 1.1-nV/√Hz noise floor, 45 MHz unity-gain bandwidth, shutdown functionality, VSSOP-8 thermal performance, and compatibility with 16-bit ADC driving and PLL loop filter roles.

Technical Context

The OPA211IDGKR implements a fully differential, high-slew-rate architecture with internal compensation for unity-gain stability. Its low 1.1 nV/√Hz voltage noise and 1.7 pA/√Hz current noise are achieved via proprietary bipolar input stage design, supporting wideband precision applications without external noise filtering.

It integrates an active high shutdown pin (Pin 8), enabling fast turn-on/turn-off (2 μs / 3 μs) and reducing quiescent current to ≤20 μA per channel when disabled. The device operates across –40°C to +125°C and supports rail-to-rail output swing into 600 Ω loads while maintaining ≥110 dB open-loop gain.

Key Specifications

Pinout & Package

The OPA211IDGKR is packaged in an 8-pin VSSOP (DGK) with 3.0 mm × 3.0 mm body size and exposed thermal pad on underside, requiring solder connection to V– for optimal thermal performance and specified electrical behavior.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA211IDGKR, OPA211IDR offers identical electrical specs in a larger SOIC package ideal for prototyping, while ADA4898-1ARMZ trades dual-channel integration and shutdown for marginally lower noise and higher static power - making OPA211IDGKR optimal for compact, battery-aware, dual-channel precision systems.

Availability

OPA211IDGKR is available at Aetrix Electronics and suitable for ultrasound scanner front-ends, semiconductor test instrumentation, and X-ray detector signal chains requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for OPA211IDGKR 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 delivering analog and embedded processing solutions, with deep expertise in precision signal chain design and high-reliability manufacturing.

The OPAx211 product line was engineered specifically for high-fidelity, low-noise data acquisition systems - balancing ultra-low noise, fast settling, rail-to-rail output, and robust thermal performance in miniature packages.

FAQ

What is the maximum operating temperature range for the OPA211IDGKR?

The OPA211IDGKR is fully specified from –40°C to +125°C ambient temperature. This extended range ensures reliable operation in harsh industrial environments such as motor control cabinets or automotive under-hood test fixtures, where thermal stress is critical. All key parameters-including offset voltage drift (±0.35 μV/°C typical), gain bandwidth, and noise-are guaranteed across this full range per TI's SBOS377L datasheet revision.

Does the OPA211IDGKR support single-supply operation?

Yes, the OPA211IDGKR supports true single-supply operation from 4.5 V to 36 V. Its rail-to-rail output stage delivers full swing from (V–) + 0.2 V to (V+) – 0.2 V under load, and its input common-mode range extends to (V–) + 1.8 V, enabling direct interfacing with unipolar sensors and DACs. This capability is validated in TI's recommended operating conditions table and typical characteristics plots.

How does the shutdown function work on the OPA211IDGKR?

The OPA211IDGKR features an active-high shutdown pin (Pin 8). When voltage at this pin reaches ≥(V+) – 0.35 V, the amplifier enters low-power state with output high-impedance and quiescent current ≤20 μA per channel. Turn-on and turn-off times are 2 μs and 3 μs respectively. The pin draws <1 μA leakage current, simplifying control interface design without additional buffering.

Can the OPA211IDGKR drive a 16-bit SAR ADC directly?

Yes, the OPA211IDGKR is explicitly characterized for 16-bit ADC driving: it achieves 700 ns settling to ±1/2 LSB (0.00075%) over a 10-V output swing, with THD+N of –136 dB at 1 kHz. Its low 125 μV max offset and 0.35 μV/°C drift prevent gain/offset errors that would degrade effective resolution - making it suitable for direct interface with 16-bit SAR or sigma-delta ADCs without external calibration.

What is the thermal pad connection requirement for the OPA211IDGKR?

The exposed thermal pad on the underside of the OPA211IDGKR's VSSOP-8 package must be soldered to the PCB and electrically connected to V– (Pin 4). TI specifies this connection as mandatory to achieve rated thermal resistance (R_θJB = 104.9°C/W), ensure stable biasing, and meet all electrical specifications - including noise, offset, and bandwidth - across temperature. Leaving the pad unconnected invalidates datasheet guarantees.