Texas Instruments OPA2626IDGKR

Overview

OPA2626IDGKR from Texas Instruments is a dual, high-speed, high-precision operational amplifier optimized as a 16-bit and 18-bit SAR ADC driver. It delivers –122 dBc HD2 and –140 dBc HD3 at 100 kHz, 120 MHz gain-bandwidth product (G = 100), 115 V/µs slew rate, and 280 ns 16-bit settling time for driving precision data acquisition systems such as the ADS88xx family.

For engineers reviewing the OPA2626IDGKR datasheet, OPA2626IDGKR pinout, OPA2626IDGKR application, or OPA2626IDGKR equivalent, key selection criteria include low distortion at high frequencies, rail-to-rail output swing, input common-mode range extending to the negative rail, DC precision (±100 µV offset), and operation across –40°C to +125°C.

Technical Context

The OPA2626IDGKR employs a high-fidelity topology with fully differential internal architecture to minimize harmonic distortion and crosstalk. Its unity-gain stability supports wideband applications up to 80 MHz, while its low 2.5 nV/√Hz input voltage noise density at 10 kHz and 1 Ω output impedance at 1 MHz ensure minimal signal degradation when driving capacitive ADC inputs.

It operates from single-supply (2.7 V to 5.5 V) or split-supply configurations, with input common-mode range from V– to (V+) – 1.15 V and rail-to-rail output swing. The device is characterized for 16-bit settling accuracy and specified over full industrial temperature range with guaranteed DC parameters including ±3 µV/°C offset drift.

Key Specifications

Pinout & Package

The OPA2626IDGKR is housed in an 8-pin VSSOP package (3.00 mm × 3.00 mm body size) with exposed thermal pad for enhanced power dissipation in high-current drive scenarios.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2189IDR and THS4561IRGET, the OPA2626IDGKR uniquely balances 120 MHz GBW, –122 dBc HD2 at 100 kHz, rail-to-rail I/O, and dual-channel integration - making it the only option validated for 16-/18-bit SAR ADCs operating at 1 MSPS with single-supply simplicity.

Availability

OPA2626IDGKR is available at Aetrix Electronics and suitable for precision SAR ADC drivers, programmable logic controller analog inputs, and high-density multiplexed data acquisition systems requiring stable component supply and long-term industrial lifecycle support.

Supply support for OPA2626IDGKR 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, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The OPA2626IDGKR belongs to TI's precision high-speed op amp product line, engineered specifically to meet the demanding AC and DC performance requirements of 16-bit and 18-bit successive-approximation register (SAR) analog-to-digital converters.

FAQ

What is the maximum recommended supply voltage for the OPA2626IDGKR?

The OPA2626IDGKR has an absolute maximum supply voltage rating of 6 V (V+ – V–). Its recommended operating supply range is 2.7 V to 5.5 V. Operation at 5.5 V is supported across the full –40°C to +125°C temperature range and is commonly used to maximize output swing and dynamic range when driving 5-V ADCs. Exceeding 5.5 V risks permanent damage.

Does the OPA2626IDGKR support single-supply operation?

Yes, the OPA2626IDGKR supports true single-supply operation with V– connected to ground. Its input common-mode voltage range extends to the negative rail (V–), and its rail-to-rail output can swing within 20 mV of both supply rails under 10 kΩ load. This allows direct interfacing with grounded sensors and 3.3-V or 5-V ADCs without level-shifting circuitry.

What is the 16-bit settling time specification for the OPA2626IDGKR?

The OPA2626IDGKR achieves 16-bit settling (0.00153% accuracy) in 280 ns for a 4-V output step at G = 2, as specified in the datasheet under high-supply conditions (V+ = 5 V, V– = 0 V). This value is fully characterized and guaranteed across temperature, enabling reliable timing margins in 1-MSPS SAR ADC systems such as those using the ADS8860.

Can the OPA2626IDGKR drive heavy capacitive loads without instability?

The OPA2626IDGKR is not unity-gain stable into arbitrary capacitive loads. For loads >20 pF, external isolation resistance (e.g., 10–50 Ω in series with the output) is required to maintain phase margin ≥50°, as shown in Figure 11 of the datasheet. Uncompensated 100-pF loads cause overshoot >20%; proper R_iso selection restores stability while preserving settling performance for ADC interface applications.

How does the OPA2626IDGKR compare to the OPA2626IDR in terms of package and performance?

The OPA2626IDGKR and OPA2626IDR are identical in electrical specifications and functionality. The difference lies solely in packaging: OPA2626IDGKR uses an 8-pin VSSOP (DGK) tape-and-reel package (3.00 mm × 3.00 mm), while OPA2626IDR uses an 8-pin SOIC (D) package (3.91 mm × 4.90 mm). Both are rated for –40°C to +125°C and share identical AC/DC parametric limits, pinout, and thermal characteristics per their respective package addenda.