Texas Instruments OPA695IDRG4

Overview

OPA695IDRG4 from Texas Instruments is a current-feedback operational amplifier optimized for high-gain, ultra-wideband signal conditioning in precision instrumentation and high-speed data acquisition systems. It delivers 600MHz small-signal bandwidth at G = +8V/V, 5000V/μs slew rate, ±4.05V output swing, and –92dBc HD3 distortion at 10MHz into 100Ω - enabling direct driving of wideband ADCs and cable-modem upstream line stages.

For engineers reviewing the OPA695IDRG4 datasheet, OPA695IDRG4 pinout, OPA695IDRG4 application, or OPA695IDRG4 equivalent, this page provides verified package mapping (SOIC-8), disable-mode timing (80ns enable), thermal metrics (RθJA = 136°C/W), and real-world harmonic distortion vs. load/resistance curves - all critical for RF front-end, arbitrary waveform generator, and portable instrument designs requiring low-glitch shutdown and single-supply operation down to 5V.

Technical Context

The OPA695IDRG4 uses a current-feedback architecture with transimpedance gain (ZOL) of 45–300kΩ and inverting-input resistance of 20Ω, enabling stable high-gain configurations without peaking-induced instability. Its feedback path connects directly to the output pin, supporting fast settling (10ns to 0.5%) and precise gain-setting via external resistors.

It integrates a dedicated DIS control pin that reduces quiescent current from 14mA to 160μA when pulled low, with 4μs disable time and 70dB off-isolation at 10MHz - making it suitable for power-gated signal chains in battery-powered test equipment and multi-channel digitizers.

Key Specifications

Pinout & Package

OPA695IDRG4 is packaged in an 8-pin SOIC (D package), 4.9mm × 6mm body size with standard lead pitch. The device features two NC pins (Pins 1 and 5), enabling simplified PCB layout and noise isolation in high-frequency layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LMH6702MA/NOPB and THS3491IRGTT, the OPA695IDRG4 uniquely balances 600MHz bandwidth, 5000V/μs slew rate, integrated disable, and SOIC-8 compatibility - making it optimal for space-constrained, power-aware wideband gain stages where pin compatibility and thermal simplicity are design constraints.

Availability

OPA695IDRG4 is available at Aetrix Electronics and suitable for very wideband ADC drivers, portable instrumentation, broadband video line drivers, and arbitrary waveform generators requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for OPA695IDRG4 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 high-speed op-amps and precision signal chain solutions.

The OPA695IDRG4 belongs to TI's Ultra-Wideband Current-Feedback Op-Amp product line, engineered specifically for high-fidelity, low-distortion signal amplification in test & measurement, communications infrastructure, and high-speed data acquisition systems.

FAQ

What is the maximum small-signal bandwidth of the OPA695IDRG4 at G = +1V/V?

The OPA695IDRG4 achieves a small-signal bandwidth of 1900MHz at unity gain (G = +1V/V) under ±5V supply conditions, as specified in the Electrical Characteristics table (Section 5.5). This bandwidth enables use in ultra-high-frequency intermediate frequency (IF) amplification and clock distribution paths where minimal phase shift across octave-wide bands is critical. The OPA695IDRG4 maintains this performance with typical peaking of only 3.7dB, ensuring predictable stability in closed-loop configurations.

Does the OPA695IDRG4 support single-supply operation?

Yes, the OPA695IDRG4 supports true single-supply operation from 5V to 12V, with verified performance at 5V (Section 5.6). At 5V supply, it delivers 500MHz small-signal bandwidth (G = +8V/V), 2500V/μs slew rate, and ±3.75V output swing into 100Ω - making it viable for portable instruments and low-voltage data acquisition systems. Input common-mode range extends from 1.6V to 3.4V, allowing DC-coupled interfacing with 5V ADC references.

What is the disable pin behavior and timing for the OPA695IDRG4?

The DIS pin on the OPA695IDRG4 is active-low: pulling it below 2.3V (typical) disables the amplifier, reducing quiescent current to 160μA. Enable time is 80ns, disable time is 4μs, and off-isolation exceeds 70dB at 10MHz. The OPA695IDRG4 remains functional with DIS left open or tied to +VS, simplifying implementation in non-power-gated designs. These specs are validated across –40°C to +85°C per Section 5.5.

How does harmonic distortion performance vary with load resistance in the OPA695IDRG4?

At 10MHz and 2VPP output, the OPA695IDRG4 shows –92dBc HD3 into 100Ω but degrades to –86dBc into 500Ω (Section 5.5). This load-dependent distortion stems from reduced loop gain at higher impedances, confirming optimal performance with 50–100Ω terminations. Figure 5-7 explicitly plots HD2/HD3 vs. load resistance, validating that 100Ω is the design point for lowest distortion in RF and video line-driving applications.

Is the OPA695IDRG4 pin-compatible with other packages in the OPA695 family?

No - the OPA695IDRG4 is the SOIC-8 variant (D package), while OPA695IDBV is SOT-23-6 and OPA695DSG is WSON-8. Pin counts and assignments differ: SOIC-8 has two NC pins (1,5) and separate ±VS pins, whereas SOT-23-6 merges functions and omits NC pins. Layout, decoupling, and thermal design must be re-validated for each package; the OPA695IDRG4 cannot be substituted without PCB revision.