Texas Instruments OPA2725AIDR

Overview

OPA2725AIDR from Texas Instruments is a dual, rail-to-rail output, high-speed precision operational amplifier optimized for driving 16-bit ADCs such as the ADS8342. It delivers 20MHz gain-bandwidth, 30V/µs slew rate, 6nV/√Hz input voltage noise at 100kHz, 0.0003% THD+N at 1kHz, and operates from ±2V to ±6V or +4V to +12V supplies.

For engineers reviewing the OPA2725AIDR datasheet, OPA2725AIDR pinout, OPA2725AIDR application, or OPA2725AIDR equivalent, this device is selected for high-fidelity signal conditioning in optical networking transimpedance amplifiers, active filters, A/D converter buffers, and portable audio front-ends where low noise, fast settling, and rail-to-rail output swing are critical.

Technical Context

The OPA2725AIDR uses a proprietary 12V analog CMOS process with a patented output stage enabling 20MHz GBW and rail-to-rail output swing within 175mV of rails (at 100kΩ load). Its input stage features FET-based architecture delivering <200pA bias current and excellent CMRR (94dB typical) and PSRR (100dB typical), supporting stable operation in single- or dual-supply configurations.

It achieves 16-bit settling in ≤450ns (0.01%) under ±6V supply, G=+1, 5V step conditions, and maintains >100dB open-loop gain over temperature (−40°C to +125°C). The device is unity-gain stable and includes ESD-protected inputs with no phase inversion when inputs exceed supply rails under current-limited conditions.

Key Specifications

Pinout & Package

OPA2725AIDR is packaged in an SOIC-8 (D package), 8-pin surface-mount plastic small-outline integrated circuit with standard JEDEC MS-012AC footprint and 1.27mm pitch. Pin 1 is marked by a beveled corner or dot.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2726AIDGST, OPA2725AIDR eliminates shutdown complexity and reduces PCB area by using SOIC-8 instead of MSOP-10; versus OPA2132UA, it delivers 2.5× higher GBW and 30% lower noise at 100kHz-critical for optical and high-resolution data acquisition.

Availability

OPA2725AIDR is available at Aetrix Electronics and suitable for optical networking transimpedance amplifiers, 16-bit ADC buffering, and active filter design requiring stable component supply across industrial, test equipment, and portable audio applications.

Supply support for OPA2725AIDR 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 specializing in analog and embedded processing technologies, with decades of expertise in precision op amps and data converter interface solutions.

The OPA725/OPA2725 product line was engineered specifically for high-fidelity, high-speed signal conditioning in 16-bit data acquisition systems, optical receivers, and audio front-ends demanding low noise, fast settling, and rail-to-rail output swing.

FAQ

What is the maximum operating supply voltage for OPA2725AIDR?

The absolute maximum supply voltage for OPA2725AIDR is +13.2V (single supply) or ±6.6V (dual supply), per the Absolute Maximum Ratings table. However, the specified operating range is +4V to +12V or ±2V to ±6V. Operation beyond ±6V risks permanent damage and invalidates parametric guarantees; TI recommends staying within the specified range for reliable performance across −40°C to +125°C.

Does OPA2725AIDR support rail-to-rail input common-mode range?

No, OPA2725AIDR does not support rail-to-rail input. Its common-mode input voltage range extends from V− to (V+) − 2V, meaning the inputs cannot accept signals within 2V of the positive rail. This limitation is intentional to preserve high CMRR and AOL across the usable range. For true rail-to-rail input, consider TI's OPA333 or OPA376 families-but note they trade off bandwidth and slew rate.

Can OPA2725AIDR drive heavy capacitive loads like ADC input capacitance?

Yes, OPA2725AIDR can drive typical ADC input capacitances (e.g., 330pF for ADS8342) when configured as a unity-gain buffer. Stability is ensured by adding a 10Ω–20Ω series resistor inside the feedback loop (between output and inverting input), as shown in Figure 3 of the datasheet. This preserves DC accuracy while suppressing ringing caused by capacitive loading.

What is the typical input bias current of OPA2725AIDR and why does it matter?

The typical input bias current of OPA2725AIDR is 30pA at +25°C, with a maximum of 200pA over temperature. This ultra-low value is critical in transimpedance amplifier applications where photodiode currents are in the pA–nA range; higher bias current would introduce significant offset error and reduce dynamic range. It also minimizes voltage drop across high-value feedback resistors (e.g., 10MΩ), preserving gain accuracy.

Is OPA2725AIDR unity-gain stable?

Yes, OPA2725AIDR is explicitly designed and tested for unity-gain stability. The datasheet confirms stability in G = +1 configurations with CL = 20pF, and application guidance (Figure 3) provides proven compensation techniques for heavier capacitive loads. No external compensation is required for standard unity-gain buffer use, simplifying design for ADC interface and voltage follower applications.