Texas Instruments THS4222D

Overview

THS4222D from Texas Instruments is a dual, rail-to-rail output, voltage-feedback operational amplifier optimized for high-speed, low-distortion signal conditioning in data acquisition and video systems. It delivers 230 MHz small-signal bandwidth (G = 1), 975 V/µs slew rate, −90 dBc HD2 and −100 dBc HD3 at 5 MHz (RL = 499 Ω), and ±4.8 V output swing into 2 kΩ - enabling precision driving of ADC inputs and composite video lines.

For engineers reviewing the THS4222D datasheet, THS4222D pinout, THS4222D application, or THS4222D equivalent, key selection considerations include its dual-channel D-package SOIC-8 footprint, rail-to-rail output swing under ±5 V supply, power-down capability absence (vs. THS4226), differential gain/phase performance (0.007% / 0.007°), and thermal dissipation limits requiring PCB copper area for the exposed pad in DGN/DGQ variants.

Technical Context

The THS4222D implements a voltage-feedback architecture with fully differential input stage and Class-AB rail-to-rail output stage, supporting stable unity-gain operation. Its 230 MHz bandwidth and 975 V/µs slew rate are achieved without current-feedback topology compromises, preserving DC accuracy and common-mode rejection.

It operates across ±1.35 V to ±7.5 V dual supplies or 2.7 V to 15 V single supply, with input common-mode range extending to within 1.1 V of rails and output swing to within 200 mV of rails (RL = 499 Ω). No internal power-down circuitry is present - distinguishing it from THS4226 and confirming its role as a continuous-operation high-fidelity buffer.

Key Specifications

Pinout & Package

THS4222D uses an 8-pin SOIC (D) package with exposed thermal pad (non-PowerPAD variant per DGN/DGQ designation; D package has no thermal pad). Pin 1 is 1OUT; pin 2 is 1IN−; pin 3 is 1IN+; pin 4 is VS−; pin 5 is VS+; pin 6 is 2OUT; pin 7 is 2IN−; pin 8 is 2IN+.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4226DGQ, THS4222D eliminates power-down circuitry for simpler biasing and lower standby current; compared with OPA2691U, it trades 270 MHz bandwidth for guaranteed rail-to-rail output swing, lower quiescent current, and tighter video distortion specs - making it optimal for precision data acquisition and broadcast video.

Availability

THS4222D is available at Aetrix Electronics and suitable for high-speed data acquisition, video signal reconstruction, and active filtering applications requiring stable component supply, consistent parametric performance across temperature, and long-term industrial lifecycle support.

Supply support for THS4222D 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-performance op-amps and data converter interface solutions.

The THS4222D belongs to TI's THS422x family of rail-to-rail output, low-distortion, high-speed op-amps designed specifically for driving precision ADCs, reconstructing video signals, and enabling wideband active filtering in instrumentation and broadcast systems.

FAQ

What is the maximum supply voltage rating for THS4222D?

The THS4222D has an absolute maximum supply voltage of ±8.25 V (16.5 V total) per the datasheet Absolute Maximum Ratings table. However, the recommended operating range is ±1.35 V to ±7.5 V for dual supply or 2.7 V to 15 V for single supply. Operating beyond ±7.5 V risks exceeding junction temperature limits and degrading long-term reliability, even if within absolute max ratings.

Does THS4222D support single-supply operation?

Yes, THS4222D supports true single-supply operation from 2.7 V to 15 V. Its input common-mode range extends from VS− + 1.1 V to VS+ − 1.1 V, and output swings to within 200 mV of either rail (e.g., 0.2 V to 4.8 V on 5 V supply). Proper DC biasing of both inputs - typically via resistor dividers to mid-supply - is required to maintain linear operation across the full input signal range.

Is THS4222D pin-compatible with THS4226?

No, THS4222D is not pin-compatible with THS4226. THS4222D uses an 8-pin SOIC (D) package with pins 1–8 assigned as 1OUT, 1IN−, 1IN+, VS−, VS+, 2OUT, 2IN−, 2IN+. THS4226 uses a 10-pin DGQ package with additional PD and REF pins. The pin count, layout, and terminal functions differ - requiring PCB redesign for substitution.

What is the thermal resistance (θJA) of THS4222D in SOIC-8 package?

The THS4222D in the standard SOIC-8 (D) package has a junction-to-ambient thermal resistance (θJA) of 97.5 °C/W, as specified in the Package Dissipation Ratings table. This value assumes use of the JEDEC standard High-K test PCB. Real-world PCB layouts with added copper pour under the package can reduce θJA significantly - critical for maintaining junction temperature ≤125°C at full 14 mA/channel quiescent current.

Can THS4222D drive a 75 Ω video load directly?

THS4222D is not rated for continuous 75 Ω driving. Its specified output current is ±100 mA (min) into 10 Ω, but sustained 75 Ω loading at full swing risks exceeding safe operating area limits and thermal shutdown. For 75 Ω video line driving, use a series 75 Ω termination at the amplifier output (i.e., 75 Ω in series with output) and match source impedance - or select a dedicated video line driver like THS3201 that specifies 75 Ω drive capability.