Texas Instruments THS4222DGK

Overview

THS4222DGK from Texas Instruments is a dual, rail-to-rail output, voltage-feedback operational amplifier optimized for high-speed, low-distortion signal conditioning in data converter interfaces and video systems. It delivers 230 MHz small-signal bandwidth (G = 1), 975 V/µs slew rate, −90 dBc HD2 / −100 dBc HD3 at 5 MHz (RL = 499 Ω), ±4.8 V output swing into 2 kΩ, and operates from ±1.35 V to ±7.5 V or single 2.7–15 V supplies.

For engineers reviewing the THS4222DGK datasheet, THS4222DGK pinout, THS4222DGK application, or THS4222DGK equivalent, key selection criteria include its dual-channel rail-to-rail output stage, 8-pin MSOP PowerPAD package thermal performance, differential gain/phase fidelity (0.007% / 0.007°), and suitability for ADC driver, active filter, and composite video signal path design.

Technical Context

The THS4222DGK implements a voltage-feedback architecture with unity-gain stability and a fully differential output stage capable of driving 499 Ω loads while maintaining <0.1 dB flatness to 40 MHz (G = 2). Its input stage supports common-mode range from VS− + 1.1 V to VS+ − 1.1 V under dual supply and features 33 MΩ input resistance and 1 pF common-mode capacitance.

Thermal management relies on the DGK package's exposed PowerPAD, which requires connection to a thermally conductive PCB plane to maintain junction temperature ≤125°C-critical for sustaining specified distortion and bandwidth performance across −40°C to +85°C operation.

Key Specifications

Pinout & Package

DGK package: 8-pin MSOP with exposed PowerPAD thermal pad (bottom side); requires soldering to PCB copper pour for thermal dissipation and electrical grounding per TI SLMA002/SLMA004 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4222D and OPA2354AIDGKR, THS4222DGK uniquely combines 230 MHz bandwidth, 975 V/µs slew rate, rail-to-rail output, and PowerPAD-enabled thermal robustness-making it the optimal choice for space-constrained, high-density video and data acquisition designs requiring sustained high-frequency linearity.

Availability

THS4222DGK is available at Aetrix Electronics and suitable for high-speed ADC driver, composite video signal conditioning, and low-voltage instrumentation applications requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for THS4222DGK 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, embedded processing, and connectivity technologies with over 50 years of innovation in high-performance signal chain components.

The THS4222 family was designed specifically for demanding high-speed analog signal conditioning tasks-including data converter interfacing, video signal distribution, and precision wideband amplification-where distortion, bandwidth, and output drive must coexist at low supply voltages.

FAQ

What is the maximum operating temperature for THS4222DGK before thermal derating begins?

The THS4222DGK is rated for continuous operation up to +85°C ambient, but its specified AC performance (e.g., 230 MHz bandwidth, −100 dBc HD3) is guaranteed only when junction temperature remains ≤125°C. With the DGK package's θJA = 260°C/W, maintaining this limit requires a thermally optimized PCB layout including PowerPAD soldering to a ≥1 cm² copper pour. At TA = 85°C, power dissipation must stay below 154 mW per channel.

Does THS4222DGK support true single-supply operation with rail-to-rail input capability?

No-THS4222DGK provides rail-to-rail *output* swing but has limited input common-mode range: under single 5 V supply, inputs must stay between 1.1 V and 3.9 V (VS− + 1.1 V to VS+ − 1.1 V). It does not accept signals at the negative rail. For true rail-to-rail input, consider alternatives like OPA2333 or TLV2462, though they lack THS4222DGK's speed and output drive.

Can THS4222DGK drive a 75 Ω video load directly without external buffering?

No-THS4222DGK is characterized into 499 Ω and 2 kΩ loads. Driving 75 Ω would exceed its 100 mA output current rating (min −88 mA sink at −40°C to +85°C) and degrade distortion and bandwidth. A series 43 Ω resistor (for 75 Ω termination) or dedicated video driver like THS3201 is required for compliant SDTV/HDTV line driving.

Is the PowerPAD on THS4222DGK electrically connected or isolated?

The PowerPAD on THS4222DGK is internally connected to the VS− pin per TI's mechanical drawings and SLMA002 application brief. It must be soldered to a PCB ground plane tied to VS− to ensure proper thermal conduction and avoid floating potential that could cause latch-up or ESD vulnerability. Do not leave it unconnected or tie it to a different potential.

How does THS4222DGK's crosstalk specification impact dual-channel video applications?

THS4222DGK's −90 dB crosstalk at 5 MHz means less than 0.03% signal coupling between channels-sufficient to prevent visible beat patterns or color bleeding in dual-path Y/C video systems. This allows independent gain/offset trimming per channel without interaction, unlike older dual op-amps with >−60 dB crosstalk that require physical separation or shielding.