Texas Instruments THS4520RGTR

Overview

THS4520RGTR from Texas Instruments is a wideband, fully differential amplifier with rail-to-rail outputs, designed for 3.3 V and 5 V data acquisition systems. It delivers 620 MHz small-signal bandwidth, –123 dBc HD3 at 100 kHz (8 V_PP, 1 kΩ), 570 V/μs slew rate, and 2 nV/√Hz input voltage noise - enabling high-fidelity signal conditioning ahead of precision ADCs in test equipment and wireless baseband chains.

For engineers reviewing the THS4520RGTR datasheet, THS4520RGTR pinout, THS4520RGTR application, or THS4520RGTR equivalent, key selection criteria include differential output common-mode control accuracy (±0.25 mV offset), power-down quiescent current (15 μA), and 0.1% settling time (7 ns) in unity-gain stable configurations driving 200 Ω differential loads.

Technical Context

The THS4520RGTR employs a fully differential architecture with independent input and output common-mode control paths. Its output common-mode circuit maintains set-point tracking within ±0.25 mV (typical) across temperature and supply variations, supporting dc-coupled interfaces to pipeline or SAR ADCs without level-shifting components.

It operates from ±1.65 V to ±2.5 V supplies (3.3 V to 5 V total), supports minimum gain of 1 V/V, and features internal mid-supply default for CM inputs when pins 4 and 9 are open. The device remains stable under unity-gain conditions with 200 Ω differential load and 499 Ω feedback resistors.

Key Specifications

Pinout & Package

RGT package: 16-pin QFN (3 mm × 3 mm, 0.4 mm pitch) with exposed thermal pad. Pin 1 marked via top-side dot; pin 13–16 and 5–8 are VS− and VS+ supply rails respectively.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fully differential amplifier applications.

Compared with THS4520RGTR, THS4521RGTR trades 70 MHz bandwidth for ~15% lower power, while LMH5401RTAR abandons integrated CM control for extreme bandwidth - making THS4520RGTR the only option combining rail-to-rail differential outputs, sub-mV CM accuracy, and 620 MHz bandwidth in a 3 mm × 3 mm QFN.

Availability

THS4520RGTR is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless infrastructure, test & measurement instrumentation, and voice processing systems requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

Supply support for THS4520RGTR 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 company specializing in analog and embedded processing technologies, with leadership in high-performance signal chain solutions.

The THS4520RGTR belongs to TI's high-speed differential amplifier product line, engineered specifically for dc-coupled, low-distortion signal conditioning in precision data acquisition and communications systems.

FAQ

What is the maximum differential output voltage swing of the THS4520RGTR at 5 V supply?

The THS4520RGTR delivers a differential output voltage swing of 7.8–8.64 V_PP over the full industrial temperature range (–40°C to +85°C) when operated from a 5 V supply (±2.5 V). This rail-to-rail capability maximizes dynamic range into modern 14- to 16-bit ADCs without external level-shifting circuitry, and is verified under 200 Ω differential load conditions per the THS4520RGTR datasheet Section 6.5.

Does the THS4520RGTR require external components for output common-mode control?

No - the THS4520RGTR integrates an output common-mode control circuit that defaults to mid-supply (0 V with ±2.5 V supplies) when pins 4 and 9 (CM) are left open. An external voltage applied to those pins directly sets the output common-mode level with ±0.25 mV typical accuracy, eliminating the need for external op-amps or resistor dividers in dc-coupled ADC interface designs per THS4520RGTR datasheet Section 7.3.2.

What is the power-down behavior of the THS4520RGTR, and how is it activated?

The THS4520RGTR enters low-power mode when the PD pin (pin 12) is driven logic low (≤ –1.5 V referenced to VS−), reducing quiescent current to 15 μA (typical). With PD open or at logic high (>1.5 V), the device operates normally. This feature enables dynamic power management in portable instrumentation and battery-powered test equipment, as confirmed in THS4520RGTR datasheet Section 6.8 and Figure 28.

Can the THS4520RGTR drive a 100 Ω differential load while maintaining specified distortion performance?

Yes - the THS4520RGTR is characterized to drive 100 Ω differential loads (50 Ω per side to mid-supply) with specified distortion: HD3 remains –123 dBc at 100 kHz with 8 V_PP output under 5 V supply conditions. However, harmonic distortion degrades slightly at higher frequencies or larger swings; full validation per application load should reference THS4520RGTR datasheet Figures 11–14 and Section 6.4.2.

Is the THS4520RGTR unity-gain stable, and what is the recommended feedback configuration?

Yes - the THS4520RGTR is unity-gain stable and optimized for use with 499 Ω feedback resistors (RF) and 200 Ω differential load (RL), as shown in the standard test circuit (Figure 55) of the THS4520RGTR datasheet. This configuration achieves 0.1% settling in 7 ns and maintains stability across temperature and process variation without requiring external compensation networks.