Texas Instruments OPA694IDBVT

Overview

OPA694IDBVT from Texas Instruments is a current-feedback operational amplifier optimized for wideband video line driving, ADC buffering, and RF signal conditioning. It delivers 690MHz bandwidth at +2V/V gain, 1700V/µs slew rate, ±80mA output drive, and 0.03%/0.015° NTSC differential gain/phase error - enabling high-fidelity analog signal paths in broadcast video routers and high-speed data acquisition systems.

For engineers reviewing the OPA694IDBVT datasheet, OPA694IDBVT pinout, OPA694IDBVT application, or OPA694IDBVT equivalent, key selection criteria include its SOT23-5 package footprint, ±5V dual-supply operation, unity-gain stability up to 1.5GHz, and low 5.8mA quiescent current - critical for space-constrained, thermally sensitive, and power-efficient designs.

Technical Context

The OPA694IDBVT implements a current-feedback architecture with an internal transimpedance stage (Z_OL ≈ 145kΩ at DC) and low-impedance inverting input (R_I ≈ 30Ω), enabling near-constant bandwidth across gains. Its feedback resistor (RF) directly controls bandwidth while gain-setting resistor (RG) defines closed-loop voltage gain without degrading stability.

It features an improved output stage delivering ±80mA into 100Ω with <1.5V headroom, low 2.1nV/√Hz input voltage noise, and optimized harmonic distortion performance (–72dBc 3rd-harmonic @ 5MHz, RL = 100Ω), making it suitable for driving 12-bit ADCs and differential receivers requiring minimal signal degradation.

Key Specifications

Pinout & Package

SOT23-5 package (DBV), 5-pin surface-mount, 2.9mm × 1.6mm footprint, 0.95mm height, thermal resistance θ_JA = 150°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with OPA695IDBVT and LMH6702MF/NOPB, the OPA694IDBVT uniquely balances ultra-wideband performance (690MHz at +2V/V), broadcast-grade video linearity (0.03%/0.015°), and low 5.8mA quiescent current - making it the optimal choice for power-sensitive, high-fidelity analog signal routing in professional video infrastructure.

Availability

OPA694IDBVT is available at Aetrix Electronics and suitable for wideband video line drivers, ADC front-end buffers, matrix switch buffers, and differential receiver circuits requiring stable component supply, RoHS-compliant packaging, and guaranteed traceability.

Supply support for OPA694IDBVT 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 video signal chain solutions.

The OPA694IDBVT belongs to TI's precision current-feedback op amp product line, engineered specifically for demanding analog signal conditioning in broadcast video, test equipment, and high-speed data acquisition systems where bandwidth, linearity, and power efficiency are co-optimized.

FAQ

What is the maximum operating supply voltage for the OPA694IDBVT?

The OPA694IDBVT supports a maximum operating supply voltage of ±6.3V per absolute maximum ratings. Operation at ±5V is recommended for optimal AC performance, including 690MHz bandwidth and –72dBc 3rd-harmonic distortion. Exceeding ±6.3V risks permanent damage; derating is advised for reliability-critical applications. The OPA694IDBVT maintains functional operation down to ±3.5V, though bandwidth and output swing decrease proportionally.

Can the OPA694IDBVT drive a 75Ω coaxial cable directly?

Yes, the OPA694IDBVT can directly drive 75Ω coaxial cable (e.g., RG-59) in noninverting gain-of-2 configuration with series 75Ω output termination. Its ±80mA output drive and <1.5V output headroom enable 2V_PP signal delivery into 75Ω loads. For optimal return loss, match input impedance using RT resistor (e.g., 75Ω to ground) and verify layout parasitics - the OPA694IDBVT's 690MHz bandwidth ensures minimal group delay distortion across HD video baseband.

Is the OPA694IDBVT pin-compatible with the OPA658?

No, the OPA694IDBVT is not pin-compatible with the OPA658. While both are current-feedback op amps in SOT23-5 packages, the OPA658 uses a different pinout: Pin 1 = –IN, Pin 2 = +IN, Pin 3 = V–, Pin 4 = V+, Pin 5 = OUT. The OPA694IDBVT assigns Pin 1 = OUT, Pin 2 = V–, Pin 3 = +IN, Pin 4 = V+, Pin 5 = –IN. PCB redesign is required for substitution; refer to OPA694IDBVT datasheet Figure 2 for correct orientation.

What feedback resistor value maximizes bandwidth for G = +2V/V in the OPA694IDBVT?

For G = +2V/V noninverting configuration, the optimal feedback resistor (RF) value is 402Ω, as validated in TI's SBOS319G datasheet (Figure 31, Electrical Characteristics table). This value balances bandwidth (690MHz), stability (no peaking), and harmonic distortion (–72dBc 3rd-harmonic). Deviating from 402Ω reduces bandwidth or increases distortion; RF tolerance should be ≤1% metal film to maintain performance consistency across the OPA694IDBVT's operating temperature range.

Does the OPA694IDBVT require external compensation capacitors?

No, the OPA694IDBVT is unity-gain stable and does not require external compensation capacitors. Its current-feedback architecture inherently avoids phase-margin issues seen in voltage-feedback op amps. However, a 0.1µF capacitor between +VS and –VS pins is recommended to improve 2nd-harmonic distortion by 3–6dB. Local 0.1µF ceramic decoupling on each supply rail (to ground) remains mandatory; no series resistors or RC networks are needed for stability in standard configurations.