Texas Instruments OPA2694IDRG4

Overview

OPA2694IDRG4 from Texas Instruments is a dual, ultra-wideband, low-power current-feedback operational amplifier designed for high-fidelity signal conditioning in demanding analog front-ends. It delivers 690MHz bandwidth at G = +2V/V, 1700V/μs slew rate, ±70mA output drive, and 0.03%/0.015° NTSC differential gain/phase error - enabling precision video line driving and ADC interface applications.

For engineers reviewing the OPA2694IDRG4 datasheet, OPA2694IDRG4 pinout, OPA2694IDRG4 application, or OPA2694IDRG4 equivalent, key selection criteria include unity-gain stability (1500MHz), low 5.8mA/ch quiescent current, differential I/O capability, RF pre-amplifier suitability up to 70MHz, and SO-8 package compatibility with high-density PCB layouts.

Technical Context

The OPA2694IDRG4 employs a current-feedback architecture that maintains bandwidth across gains - sustaining >200MHz at G = 10V/V - unlike voltage-feedback amplifiers whose bandwidth collapses with increasing gain. Its low-impedance inverting input (30Ω typical) and high-impedance noninverting input (280kΩ || 1.2pF) enable precise gain-setting and stable wideband operation with minimal peaking.

It features an improved output stage delivering ±70mA into 100Ω while maintaining <1.5V output voltage headroom at ±5V supplies, and achieves −93dBc 2nd-harmonic distortion (RL ≥ 500Ω, f = 5MHz, VO = 2VPP). The device supports both DC-coupled and AC-coupled configurations for differential I/O, SAW buffer, and ADC driver use cases.

Key Specifications

Pinout & Package

OPA2694IDRG4 is housed in an industry-standard SO-8 (D) package with exposed pad for thermal enhancement. Pin assignments follow TI's dual CFB op amp layout optimized for matched parasitics and minimal crosstalk.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2694IDRG4, OPA2658IDR trades bandwidth and video linearity for lower cost and maturity, while OPA2695IDR extends RF linearity at the expense of quiescent power - making OPA2694IDRG4 the optimal balance for wideband video and medium-dynamic-range IF applications.

Availability

OPA2694IDRG4 is available at Aetrix Electronics and suitable for medical imaging systems, broadcast video infrastructure, high-speed data acquisition, and RF test equipment requiring stable component supply and long-term production continuity.

Supply support for OPA2694IDRG4 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 OPA2694IDRG4 belongs to TI's Ultra-Wideband Current-Feedback Op Amp product line, engineered specifically for high-fidelity, low-power analog signal conditioning in video, medical, and communications infrastructure.

FAQ

What is the maximum operating supply voltage for the OPA2694IDRG4?

The OPA2694IDRG4 supports a maximum operating voltage range of ±6.3V, with absolute maximum ratings of ±6.5VDC on the power supply pins. Operation beyond ±6.3V risks exceeding internal power dissipation limits and may degrade reliability. For standard applications, ±5V is recommended to ensure optimal bandwidth, distortion, and thermal performance across the full −40°C to +85°C temperature range.

Does the OPA2694IDRG4 support single-supply operation?

The OPA2694IDRG4 is specified for dual-supply operation (±3.5V to ±6.3V) and does not support true single-supply operation due to its input common-mode voltage range (±2.1V min at −40°C to +85°C) and output swing limitations. However, it can be used in pseudo-single-supply configurations by biasing both noninverting inputs to a mid-rail reference (e.g., VCC/2) and AC-coupling inputs/outputs - as demonstrated in TI's Sallen-Key active filter reference design (Figure 9).

How does the OPA2694IDRG4 compare to the OPA2695IDR in terms of harmonic distortion?

The OPA2694IDRG4 achieves −93dBc 2nd-harmonic distortion (RL ≥ 500Ω, f = 5MHz, VO = 2VPP), while the OPA2695IDR improves this to −95dBc under identical conditions. Both parts deliver −93dBc 3rd-harmonic distortion at RL ≥ 500Ω. The OPA2695IDR's enhanced linearity stems from its higher 3rd-order intercept (+55dBm vs. +50dBm), making it preferable in ultra-low-spurious RF receiver stages where distortion floor is critical.

Can the OPA2694IDRG4 be used as a differential receiver with transformer-coupled inputs?

Yes - the OPA2694IDRG4 is explicitly validated for differential receiver applications using transformer-coupled inputs. Its matched dual architecture, low channel-to-channel crosstalk (−63dB @ 5MHz), and symmetrical input impedance support balanced signal recovery. TI's Application Note SBOS320D shows transformer-coupled configurations (e.g., Figure 7) where common-mode rejection is handled externally, and the OPA2694IDRG4 provides gain and drive without degrading CMRR.

What is the thermal resistance (θJA) of the OPA2694IDRG4 in SO-8 package?

The OPA2694IDRG4 in SO-8 (D) package has a typical junction-to-ambient thermal resistance (θJA) of 125°C/W, measured under standard JEDEC JESD51-2 conditions (single-layer board, 1-inch² copper pad). This value assumes proper PCB layout with thermal vias under the exposed pad. At maximum quiescent current (12.7mA total) and ambient temperature of +85°C, junction temperature remains within safe limits (<125°C) when θJA is maintained below 125°C/W.