Texas Instruments OPA625IDBVR

Overview

OPA625IDBVR from Texas Instruments is a high-bandwidth, low-distortion operational amplifier optimized as a precision driver for 16-bit and 18-bit SAR ADCs such as the ADS8860. It delivers 120 MHz gain-bandwidth, 115 V/µs slew rate, 280 ns 16-bit settling time, ±100 µV max offset voltage, and –140 dBc third-harmonic distortion at 100 kHz - enabling high-fidelity signal acquisition in data acquisition systems.

For engineers reviewing the OPA625IDBVR datasheet, OPA625IDBVR pinout, OPA625IDBVR application, or OPA625IDBVR equivalent, key selection criteria include its dual-mode operation (high-drive vs. low-power), rail-to-rail output, input common-mode range extending to the negative rail, and verified performance driving capacitive loads up to 20 pF with stable settling under 16-bit accuracy requirements.

Technical Context

The OPA625IDBVR implements a power-scalable architecture with a MODE pin that selects between high-drive mode (120 MHz GBW, 115 V/µs SR) and low-power mode (1 MHz GBW, 270 µA IQ). Transition from low-power to high-drive occurs in 170 ns while maintaining 16-bit ENOB integrity.

Its fully differential input stage supports rail-to-rail output swing and includes internal compensation for stable unity-gain operation. The device is characterized across –40°C to +125°C with guaranteed 2.7 V to 5.5 V supply operation, 1.15 V input common-mode headroom, and <1 Ω open-loop output impedance at 1 MHz in high-drive mode.

Key Specifications

Pinout & Package

OPA625IDBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in portable instrumentation and modular data acquisition systems.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-precision SAR ADC driver applications.

Compared with OPA837IDBVR and THS4561IRGET, the OPA625IDBVR uniquely combines 16-bit-verified settling, dual-mode power scaling, and SOT-23 footprint - making it the only option that satisfies simultaneous requirements for low-power wake-up latency, high-accuracy SAR ADC interfacing, and compact industrial PCB layout.

Availability

OPA625IDBVR is available at Aetrix Electronics and suitable for precision SAR ADC drivers, programmable logic controller analog inputs, and test and measurement signal conditioning requiring stable component supply across extended temperature and long production lifecycles.

Supply support for OPA625IDBVR 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 OPAx625 product line was designed specifically to address the timing, distortion, and power challenges of driving modern high-throughput, high-resolution SAR ADCs - with emphasis on 16-bit/18-bit accuracy, sub-300 ns settling, and adaptive power modes.

FAQ

What is the maximum capacitive load the OPA625IDBVR can drive while maintaining 16-bit settling stability?

The OPA625IDBVR is characterized for stable operation with up to 20 pF capacitive load in high-drive mode when configured with RF = 1 kΩ and CF = 2.7 pF. At this load, it achieves 280 ns 16-bit settling to 0.00153% error. For heavier loads, series isolation resistance (Riso) up to 50 Ω may be added to maintain phase margin without degrading settling time beyond specification. This capability is validated in Figure 15 of the SBOS688A datasheet.

Does the OPA625IDBVR support true rail-to-rail input operation?

The OPA625IDBVR supports rail-to-rail output swing but does not offer rail-to-rail input. Its input common-mode voltage range extends to the negative rail (V–) but stops 1.15 V below the positive rail (V+), meaning the maximum allowable input is (V+) – 1.15 V. This is sufficient for most single-supply ADC driver applications where the input signal stays within 0–(V+ – 1.15 V), as confirmed in Section 6.3 Recommended Operating Conditions of the datasheet.

How does the MODE pin function in the OPA625IDBVR, and what happens if it's left unconnected?

The MODE pin on the OPA625IDBVR selects operating mode: pulled to V– for high-drive mode (2 mA, 120 MHz), or pulled to V+ for low-power mode (270 µA, 1 MHz). The datasheet explicitly warns "Do not float this pin" - an unconnected MODE pin causes undefined behavior, potential oscillation, or excessive current draw due to internal logic ambiguity. A 10-kΩ pull-down to V– is recommended for default high-drive operation.

Can the OPA625IDBVR operate from a 3.3 V single supply, and how does performance compare to 5 V operation?

Yes, the OPA625IDBVR operates from 2.7 V to 5.5 V supplies. At 3.3 V, high-drive mode maintains 120 MHz GBW and 115 V/µs slew rate, but harmonic distortion degrades slightly: HD3 is –130 dBc at 100 kHz (vs –140 dBc at 5 V), and 16-bit settling increases to 250 ns for a 1-V step. These values are specified in Section 6.7 Electrical Characteristics and confirm full functionality across the entire supply range.

What is the overload recovery time of the OPA625IDBVR, and why does it matter in ADC driver applications?

The OPA625IDBVR has a 35 ns overload recovery time (tOR) in high-drive mode when gain = 5. This parameter defines how quickly the amplifier returns to linear operation after clipping - critical when driving SAR ADCs that may present transient overvoltage conditions during sample-and-hold switching. Fast recovery prevents settling errors in subsequent conversion cycles and is measured per Section 6.5 AC Performance in the datasheet.