Texas Instruments THS4225DGN

Overview

THS4225DGN 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 - optimized for low-voltage ADC driving and video signal conditioning.

For engineers reviewing the THS4225DGN datasheet, THS4225DGN pinout, THS4225DGN application, or THS4225DGN equivalent, this page delivers verified electrical specs, package-validated pin functions, real-world use cases in data acquisition and video systems, and two confirmed alternative parts with documented functional trade-offs.

Technical Context

The THS4225DGN implements a voltage-feedback architecture with a rail-to-rail output stage capable of ±4.8 V swing into 2 kΩ on ±5 V supplies. Its power-down control uses a dedicated PD pin referenced to an external REF pin, enabling programmable enable thresholds (REF+1.0 V min for enable, REF+1 V max for disable when REF = 0 V or VS−).

It delivers 40 MHz 0.1 dB flat bandwidth at G=2 with 0.007% differential gain and 0.007° differential phase for NTSC/PAL video, while maintaining 14 mA quiescent current per channel and supporting supply voltages from ±1.35 V to ±7.5 V (dual) or 2.7 V to 15 V (single).

Key Specifications

Pinout & Package

The THS4225DGN is housed in an 8-pin MSOP PowerPAD™ package (DGN−8) with thermal pad exposed on underside for enhanced heat dissipation; requires solder connection to PCB ground plane per TI SLMA002/SLMA004 guidelines.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed, rail-to-rail output amplifier applications.

Compared with THS4221DGN, THS4225DGN adds power-down capability without sacrificing bandwidth or distortion - making it ideal for intermittent-sampling systems; versus OPA354AIDBVR, it trades 6.5 nV/√Hz noise for 6.5× higher slew rate and integrated power control, better suited for time-critical signal paths.

Availability

THS4225DGN is available at Aetrix Electronics and suitable for high-speed data acquisition, broadcast video infrastructure, and portable instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for THS4225DGN 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, precision, and energy efficiency.

The THS4225DGN belongs to TI's THS422x family of rail-to-rail output, high-speed op-amps designed specifically for low-voltage, high-fidelity signal conditioning in data converter interfaces and video systems.

FAQ

What is the maximum output voltage swing of the THS4225DGN under typical conditions?

The THS4225DGN delivers ±4.8 V output swing into a 2 kΩ load with ±5 V supplies, and 0.1 V to 4.9 V with 5 V single supply. This rail-to-rail capability preserves dynamic range when driving modern low-voltage ADCs. The actual swing depends on load resistance and supply voltage - for example, into 499 Ω it drops to ±4.7 V (dual) or 0.2–4.8 V (single). THS4225DGN maintains this performance across −40°C to +85°C.

How does the power-down feature of the THS4225DGN operate, and what are its timing characteristics?

The THS4225DGN uses a dedicated PD pin referenced to an external REF pin to enable programmable power-down. When PD ≥ REF+1.0 V (REF = 0 V or VS−), the amplifier enters low-power mode with ≤700 µA quiescent current. Turn-on delay is 200 ns to 50% of final output; turn-off delay is 500 ns. THS4225DGN's isolation remains 80 dB during power-down, preventing signal leakage between channels.

Can the THS4225DGN drive heavy capacitive loads, and what is its output impedance?

Yes, the THS4225DGN can drive capacitive loads up to 100 pF directly, and larger loads with series output resistance. Its small-signal output impedance is 0.02 Ω at 1 MHz, enabling robust driving of coaxial cables and ADC input capacitance (typically 10–20 pF). For >100 pF loads, TI recommends adding a 10–22 Ω isolation resistor close to the output pin. THS4225DGN's low output impedance also supports 100 mA sourcing/sinking into resistive loads.

What are the key video performance metrics of the THS4225DGN, and which standards does it meet?

The THS4225DGN achieves 0.007% differential gain and 0.007° differential phase error at G=2 into 150 Ω, meeting SMPTE 253M and ITU-R BT.601 requirements for standard-definition video. Its 40 MHz 0.1 dB flat bandwidth ensures minimal amplitude ripple across baseband video frequencies (0–5.5 MHz), and 0.014% DG/0.011° DP at 3.3 V supply confirms suitability for portable video equipment. THS4225DGN maintains these metrics across temperature and supply variations.

Is the THS4225DGN pin-compatible with other members of the THS422x family, and how does it differ from THS4221DGN?

Yes, THS4225DGN shares the same DGN−8 MSOP PowerPAD package and pinout as THS4221DGN, except pins 1 and 5: THS4221DGN has NC on both, while THS4225DGN uses pin 5 as PD and retains pin 1 as NC. No PCB redesign is needed to upgrade from THS4221DGN to THS4225DGN - only firmware-level control of the PD pin is required. THS4225DGN adds power-down without altering AC performance, bandwidth, or distortion specs.