Texas Instruments THS4225DGK

Overview

THS4225DGK from Texas Instruments is a single-channel, rail-to-rail output, high-speed operational amplifier with power-down functionality, 230 MHz small-signal bandwidth (G=1), 975 V/µs slew rate, and −90 dBc second-harmonic distortion at 5 MHz - designed for low-voltage ADC driving and video signal conditioning in space-constrained industrial and test equipment.

For engineers reviewing the THS4225DGK datasheet, THS4225DGK pinout, THS4225DGK application, or THS4225DGK equivalent, this page delivers verified electrical specs, package-validated terminal roles, real-world use-value per application, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The THS4225DGK implements a voltage-feedback architecture optimized for unity-gain stability across ±1.35 V to ±7.5 V dual supplies or 2.7 V to 15 V single supply. Its rail-to-rail output stage delivers ±4.8 V swing into 2 kΩ while maintaining <0.007% differential gain and 0.007° differential phase for NTSC/PAL video signals.

Power-down control is implemented via dedicated PD and REF pins, enabling <1 mA quiescent current per channel when disabled. Input common-mode range extends from VS− + 1.1 V to VS+ − 1.1 V under dual supply, supporting wide dynamic input headroom.

Key Specifications

Pinout & Package

THS4225DGK uses an 8-pin MSOP PowerPAD (DGK) package with thermal pad exposed on underside for PCB-level heat dissipation. Pin 1 is REF, Pin 5 is PD - both required for power-down activation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4221DGK, THS4225DGK adds power-down control at no AC performance cost - making it superior for battery-powered or thermally constrained designs. Versus OPA690DGK, THS4225DGK trades bandwidth for rail-to-rail operation and lower noise floor, better matching precision video and low-voltage ADC interface needs.

Availability

THS4225DGK is available at Aetrix Electronics and suitable for high-speed data acquisition, broadcast video infrastructure, and portable test instrumentation requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for THS4225DGK 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 over 50 years of innovation in high-performance signal chain components.

The THS422x family was engineered specifically for high-fidelity, low-distortion signal conditioning in data converter interfaces and professional video systems - prioritizing bandwidth, slew rate, and video-specific linearity metrics over general-purpose op-amp traits.

FAQ

What is the maximum supply voltage for THS4225DGK?

The absolute maximum supply voltage for THS4225DGK is ±8.25 V (16.5 V total) for dual supply or 16.5 V for single supply. However, the recommended operating range is ±1.35 V to ±7.5 V dual or 2.7 V to 15 V single. Operating beyond ±7.5 V risks exceeding the 125°C junction temperature limit due to increased power dissipation - which degrades distortion performance and long-term reliability. THS4225DGK must be thermally anchored via its PowerPAD to maintain safe operation at rated loads.

Does THS4225DGK support true single-supply operation with rail-to-rail input?

THS4225DGK supports rail-to-rail *output* swing but not rail-to-rail *input*. Its input common-mode range is VS− + 1.1 V to VS+ − 1.1 V - meaning with a 5 V single supply (VS− = 0 V, VS+ = 5 V), valid input voltages span 1.1 V to 3.9 V. To handle signals near ground or VCC, external level-shifting or biasing (e.g., using the REF pin or external resistive divider) is required. This limitation is inherent to its input stage architecture and is explicitly specified in the datasheet's "RECOMMENDED OPERATING CONDITIONS" table.

How do I configure the power-down function on THS4225DGK?

To enable power-down on THS4225DGK, tie REF to a stable voltage (e.g., 0 V or VS−), then drive PD to ≥ REF + 1.8 V to activate shutdown (max 700 µA current). To exit power-down, drive PD to ≤ REF + 1 V. For flexible threshold control, connect REF to an adjustable voltage source - e.g., a DAC output - allowing programmable entry/exit points. The 200 ns turn-on and 500 ns turn-off delays are measured to 50% of final output voltage, and isolation remains >80 dB during power-down to prevent signal coupling.

What is the thermal design requirement for THS4225DGK in DGK package?

THS4225DGK in the DGK (MSOP PowerPAD) package requires the exposed thermal pad to be soldered to a minimum 100 mm² copper pour connected to internal ground or power planes. Without this, θJA rises to 260°C/W, limiting continuous power dissipation to 154 mW at 85°C ambient - insufficient for sustained 100 mA output drive. With proper PowerPAD thermal anchoring, θJA drops effectively, enabling reliable operation at full 14 mA quiescent current and 100 mA load current without exceeding the 125°C junction limit. TI technical brief SLMA002 details layout best practices.

Can THS4225DGK drive a 75 Ω video load directly?

THS4225DGK is not rated for direct 75 Ω video load driving. Its specified output swing (±4.7 V) and current (±100 mA) assume RL ≥ 499 Ω. Driving 75 Ω would require ±100 mA into 3.75 V swing - exceeding its guaranteed output capability and risking distortion increase and thermal overload. For 75 Ω video, use a dedicated video line driver (e.g., THS3091) or add a series 43.5 Ω resistor to form a 75 Ω source-terminated interface - preserving signal integrity while staying within THS4225DGK's safe operating area.