Texas Instruments OPA211AIDGKTG4

Overview

OPA211AIDGKTG4 from Texas Instruments is a dual-channel, precision operational amplifier with 1.1 nV/√Hz input voltage noise density at 1 kHz, 700 ns 16-bit settling time, and rail-to-rail output swing. It operates from ±2.25 V to ±18 V (or 4.5 V to 36 V single supply) and delivers 30 mA output current. It is used in high-resolution data acquisition systems driving 16-bit ADCs and buffering DAC outputs.

For engineers reviewing the OPA211AIDGKTG4 datasheet, OPA211AIDGKTG4 pinout, OPA211AIDGKTG4 application, or OPA211AIDGKTG4 equivalent, key selection criteria include ultra-low noise performance, fast 16-bit settling, low offset drift (0.35 µV/°C), shutdown functionality, and compatibility with precision instrumentation, test equipment, and seismic DAQ systems.

Technical Context

The OPA211AIDGKTG4 implements a fully differential, high-speed precision op-amp architecture optimized for low-noise signal conditioning. Its unity-gain stable design supports gain configurations from G = 1 to G = 100, with 45 MHz GBW at G = 1 and 80 MHz at G = 100, enabling wideband loop filter use in PLLs and high-fidelity analog front-ends.

It integrates active shutdown control (active-high, 2 µs turn-on), rail-to-rail output stage capable of ±0.2 V swing from rails under 114 dB open-loop gain, and robust ESD protection (3 kV HBM, 1 kV CDM). Thermal design leverages the exposed thermal pad (connected to V–) in its VSSOP-8 package for enhanced power dissipation.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.0 mm × 3.0 mm body, 0.65 mm pitch, exposed thermal pad on underside requiring solder connection to V– plane for thermal and electrical performance compliance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA211AIDR and ADA4898-1ARMZ, the OPA211AIDGKTG4 uniquely combines dual-channel operation, active shutdown, 4.5–36 V supply support, and VSSOP-8 compactness-making it optimal for space-constrained, power-aware, wide-supply precision instrumentation.

Availability

OPA211AIDGKTG4 is available at Aetrix Electronics and suitable for ultrasound scanner front-ends, semiconductor test equipment, and seismic data acquisition systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for OPA211AIDGKTG4 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 precision amplifiers, data converters, and power management ICs.

The OPA211AIDGKTG4 belongs to TI's OPAx211 precision op-amp family, designed specifically for high-resolution data acquisition, test and measurement, and medical imaging systems demanding ultra-low noise, fast settling, and wide supply operation.

FAQ

What is the maximum operating temperature range for the OPA211AIDGKTG4?

The OPA211AIDGKTG4 is specified from –40°C to +125°C ambient temperature. This extended industrial temperature range ensures reliable operation in harsh environments such as industrial test racks, downhole seismic tools, and medical imaging enclosures where thermal management is constrained. The device maintains its 125 µV max offset and 0.35 µV/°C drift specification across this full range, as confirmed in the Electrical Characteristics tables for standard-grade OPAx211A devices.

Does the OPA211AIDGKTG4 support single-supply operation?

Yes, the OPA211AIDGKTG4 supports true single-supply operation from 4.5 V to 36 V. Its rail-to-rail output stage delivers voltage swings within 0.2 V of each rail under load, and its input common-mode range extends to within 1.4 V of V+, enabling direct interfacing with microcontroller ADC references and single-rail sensor interfaces. The shutdown pin functions correctly across the full supply range, allowing power sequencing in battery-powered or energy-conscious instruments.

What is the purpose of the exposed thermal pad on the OPA211AIDGKTG4 VSSOP-8 package?

The exposed thermal pad on the OPA211AIDGKTG4 (DGK package) must be soldered to the PCB and connected to the V– net. This connection provides critical thermal conduction to reduce junction temperature and ensures specified electrical performance-including 16-bit settling time and noise characteristics. Per TI's datasheet Section 5 and Thermal Information Table 6.4, omitting this connection degrades RθJB by >150% and risks exceeding thermal limits under sustained 3.6 mA/channel quiescent current.

How does the shutdown feature of the OPA211AIDGKTG4 behave electrically?

The OPA211AIDGKTG4 shutdown pin (Pin 8) is active-high: the amplifier is enabled when voltage is ≤(V+) – 3 V, and disabled when ≥(V+) – 0.35 V. In shutdown, the output enters high-impedance state and quiescent current drops to ≤20 µA. Turn-on time is 2 µs and turn-off time is 3 µs, enabling rapid channel gating in multiplexed DAQ systems. Shutdown pin leakage remains ≤1 µA, minimizing impact on external control logic.

Can the OPA211AIDGKTG4 drive a 600 Ω load while maintaining precision specifications?

Yes-the OPA211AIDGKTG4 delivers ±30 mA output current and is fully specified into 600 Ω loads. At this load, its output swing is guaranteed to be within (V–) + 0.6 V to (V+) – 0.6 V while maintaining ≥110 dB open-loop gain and ≤125 µV offset. Its –136 dB THD+N at 1 kHz with 3 VRMS output into 600 Ω confirms linearity integrity, making it suitable for driving legacy test equipment inputs and audio-grade signal paths without external buffers.