Texas Instruments THS3201DGN

Overview

THS3201DGN from Texas Instruments is a 1.8-GHz current-feedback amplifier (CFA) optimized for high-speed, low-distortion signal conditioning in ±7.5 V systems. It delivers 6700 V/µs slew rate (G = 2, 10-V step), –78 dBc IMD3 at 20 MHz, 1.65 nV/√Hz input voltage noise, and 100 mA output drive into 100 Ω - enabling precision arbitrary waveform generation and high-resolution ADC/DAC buffering.

For engineers reviewing the THS3201DGN datasheet, THS3201DGN pinout, THS3201DGN application, or THS3201DGN equivalent, key selection criteria include its MSOP-8 PowerPAD™ package thermal performance, current-feedback architecture's gain-bandwidth independence, ±3.3 V to ±7.5 V supply flexibility, and verified distortion performance at 100 MHz with 2-VPP envelope signals.

Technical Context

The THS3201DGN implements a current-feedback topology with ultra-low inverting-input impedance (~11 Ω) and high noninverting-input impedance (~780 kΩ), enabling stable wideband operation independent of closed-loop gain. Its transimpedance gain exceeds 120 kΩ over temperature, supporting precise current-to-voltage conversion in high-speed test instrumentation.

Designed for ±7.5 V operation (±3.3 V min), the device features matched input bias currents (±14 µA noninverting, ±13 µA inverting), 71 dB CMRR at ±3.75 V common-mode, and 0.01 Ω closed-loop output impedance at 1 MHz - critical for driving reactive loads and maintaining signal integrity in ATE front-ends.

Key Specifications

Pinout & Package

The THS3201DGN is housed in an 8-pin MSOP package with exposed PowerPAD™ thermal pad on the underside, requiring connection to a copper plane for junction temperature control below +125°C. The PowerPAD is electrically isolated from internal circuitry.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS3202DR and OPA695IDBVR, the THS3201DGN uniquely combines ±7.5 V operation, 1.8 GHz bandwidth, and MSOP-8 PowerPAD™ thermal packaging - making it the sole option for high-swing, high-fidelity single-channel amplification in thermally dense ATE modules.

Availability

THS3201DGN is available at Aetrix Electronics and suitable for arbitrary waveform generation, high-speed ADC driving, and ATE front-end amplification requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

Supply support for THS3201DGN 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 amplifier design and manufacturing.

The THS3201 product line targets wideband, low-distortion signal conditioning for test and measurement, ATE, and high-resolution data converter interfaces - emphasizing voltage swing, thermal robustness, and spectral purity.

FAQ

What is the maximum safe operating voltage for THS3201DGN?

The THS3201DGN has an absolute maximum supply voltage rating of ±8.25 V, but its recommended operating range is ±3.3 V to ±7.5 V. Operation at ±8.25 V risks exceeding junction temperature limits and degrading long-term reliability. For optimal distortion performance and thermal margin, THS3201DGN should be operated within the ±7.5 V specification, especially when delivering 100 mA output current.

Does THS3201DGN require external compensation for stability?

Yes, THS3201DGN requires careful external compensation due to its current-feedback architecture. Stability depends on feedback resistor (RF) value and capacitive load. For example, with RL = 100 Ω and CL = 50 pF, a 20 Ω isolation resistor (RISO) is recommended. The THS3201DGN datasheet provides RISO vs. CL curves (Figure 7) and gain-dependent RF values (e.g., 768 Ω for G = 2) to ensure phase margin >45°.

How does the PowerPAD™ on THS3201DGN affect PCB layout?

The PowerPAD™ on THS3201DGN must be soldered to a dedicated thermal copper plane connected to VS– or ground via multiple vias. Failure to do so raises junction temperature beyond +125°C, increasing distortion and reducing reliability. TI recommends ≥4 thermal vias (0.3 mm diameter) under the pad, with the plane sized per θJA = 58.4°C/W. This requirement directly impacts THS3201DGN's 1.71 W power rating at +25°C ambient.

Can THS3201DGN drive 50 Ω transmission lines directly?

THS3201DGN can drive 50 Ω loads but requires series output isolation (RISO) to prevent instability with cable capacitance. At G = 2, it delivers ±5.8 V into 100 Ω (±5.5 V into 100 Ω at +85°C), so driving 50 Ω demands careful gain-setting and termination. For 50 Ω systems, use THS3201DGN in noninverting configuration with RF = 768 Ω and add a 25 Ω series resistor to match characteristic impedance while maintaining stability per Figure 7 guidelines.

Is THS3201DGN suitable for single-supply operation?

No, THS3201DGN is not designed for true single-supply operation. Its input common-mode range is ±5.1 V at ±7.5 V supplies, and output swing is rail-to-rail limited - it cannot operate with VS– = 0 V. While the datasheet lists "Single supply: 6.6 V to 15 V", this refers to total supply voltage (VS+ – VS–), not ground-referenced operation. THS3201DGN requires symmetric dual supplies (e.g., ±5 V or ±7.5 V) to meet specified AC performance and avoid input/output clipping.