Texas Instruments OPA2694IDR

Overview

OPA2694IDR from Texas Instruments is a dual, ultra-wideband, low-power current-feedback operational amplifier optimized for high-fidelity video and RF signal conditioning. 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 use as an ADC driver in medical imaging systems and wideband video line drivers.

For engineers reviewing the OPA2694IDR datasheet, OPA2694IDR pinout, OPA2694IDR application, or OPA2694IDR equivalent, key selection criteria include its current-feedback architecture's gain-bandwidth independence, low 5.8mA/ch quiescent current, SO-8 package compatibility with high-density routing, and verified performance in differential receiver and SAW pre-amplifier roles.

Technical Context

The OPA2694IDR implements a current-feedback topology where bandwidth remains stable across gains (e.g., >200MHz at G = 10), unlike voltage-feedback amplifiers. Its transimpedance gain of 58kΩ (min) and low inverting input resistance (30Ω typ) define loop dynamics and require precise feedback resistor selection (e.g., 402Ω for G = +2) to optimize flatness and stability.

It features a rail-to-rail compatible output stage delivering ±3.4V into 100Ω with <1.5V headroom, and supports dual ±5V operation (±3.5V to ±6.3V range). Input common-mode range extends to ±2.1V over temperature, and channel-to-channel crosstalk is –63dB at 5MHz - critical for dual-channel integrity in differential I/O and ADC interface designs.

Key Specifications

Pinout & Package

OPA2694IDR is housed in an industry-standard SO-8 (D) package with exposed pad not present; thermal resistance θ_JA = 125°C/W. Pin functions are validated per TI SBOS320D datasheet Figure 1 (top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA2658IDR and OPA2691IDR, the OPA2694IDR uniquely balances ultra-wideband performance (690MHz), low power (5.8mA/ch), and broadcast-grade video linearity - making it optimal for high-density video routers and portable medical imaging front-ends where thermal and board space budgets are tight.

Availability

OPA2694IDR is available at Aetrix Electronics and suitable for medical imaging systems, wideband video infrastructure, and high-speed data acquisition requiring stable component supply and guaranteed long-term manufacturability.

Supply support for OPA2694IDR 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 amp design and manufacturing.

The OPA2694IDR belongs to TI's OPA26xx current-feedback op amp family, engineered specifically for wideband signal conditioning in video, communications, and instrumentation - emphasizing low power, high linearity, and SO-8 compatibility.

FAQ

What is the maximum operating supply voltage for the OPA2694IDR?

The OPA2694IDR supports a maximum operating voltage range of ±6.3V, with absolute maximum ratings at ±6.5VDC. Operation beyond ±6.3V risks exceeding internal power dissipation limits and degrading reliability. For standard applications, ±5V is recommended to ensure optimal bandwidth, distortion, and thermal performance - all electrical characteristics in the datasheet are specified at this condition.

Can the OPA2694IDR be used in single-supply configurations?

Yes, the OPA2694IDR can operate from a single supply (e.g., +10V with ground), provided the input common-mode voltage stays within its specified range (±2.1V over temperature) and output swing accommodates the load. AC-coupling with proper level-shifting at inputs and outputs is required; the non-inverting inputs must be biased to a stable common-mode voltage (e.g., V_CC/2) using resistive dividers or dedicated references to maintain linear operation.

How does the OPA2694IDR differ from voltage-feedback op amps in layout practice?

Unlike voltage-feedback op amps, the OPA2694IDR's current-feedback architecture demands strict control of feedback resistor value (e.g., 402Ω for G = +2) and minimal parasitic capacitance at the inverting input. Layout must minimize trace length to the −In pins, avoid vias near feedback nodes, and place RF close to the package. Ground plane integrity under the SO-8 body is critical - split planes or noisy return paths degrade bandwidth and increase distortion.

Is the OPA2694IDR pin-compatible with other OPA26xx-series devices?

Yes, the OPA2694IDR shares the same SO-8 (D) package and pinout with OPA2658IDR, OPA2691IDR, and OPA2695IDR - enabling drop-in replacement in many designs. However, differences in bandwidth, output current, and supply current mean that layout and compensation may require verification; for example, OPA2694IDR's lower quiescent current reduces thermal load but may shift stability margins if feedback network values are unchanged.

What is the recommended feedback resistor for G = +5 configuration?

For a non-inverting gain of +5, the OPA2694IDR datasheet specifies RF = 330Ω (with RG = 82.5Ω) to achieve optimal bandwidth (150MHz min) and flat frequency response. Using values outside this range - especially higher RF - reduces bandwidth and increases peaking; lower RF may improve bandwidth but risks instability due to increased loop gain. Always verify stability with load and PCB parasitics using SPICE simulation or bench testing.