Texas Instruments THS4520RGTTG4

Overview

THS4520RGTTG4 from Texas Instruments is a wideband, fully differential amplifier with rail-to-rail outputs, designed for high-fidelity 5-V and 3.3-V data acquisition systems. It delivers 620 MHz small-signal bandwidth, –123 dBc HD3 at 100 kHz (8 V_PP, 1 kΩ), and 570 V/μs slew rate - enabling precise amplification of fast, low-distortion signals before ADC sampling in instrumentation and wireless baseband chains.

For engineers reviewing the THS4520RGTTG4 datasheet, THS4520RGTTG4 pinout, THS4520RGTTG4 application, or THS4520RGTTG4 equivalent, key selection criteria include output common-mode control accuracy (±0.25 mV offset), 2 nV/√Hz input voltage noise above 10 kHz, and guaranteed 0.1% settling in 7 ns - critical for high-resolution, multi-channel SAR and pipeline ADC driver designs.

Technical Context

The THS4520RGTTG4 implements a fully differential architecture with independent input and output common-mode control paths. Its output common-mode circuit maintains setpoint tracking within ±0.25 mV (typical) across temperature and load, defaulting to mid-supply but accepting external override via dual CM pins - essential for dc-coupled ADC interfaces requiring precise level shifting.

It supports unity-gain stability with minimum gain of 1 V/V (0 dB), operates from ±1.65 V to ±2.5 V supplies (3.3 V to 5 V total), and integrates power-down functionality reducing quiescent current to 15 μA. The device's 7.8–8.64 V differential output swing into 100 Ω loads enables full-scale drive of modern 16-bit+ ADCs without clipping.

Key Specifications

Pinout & Package

THS4520RGTTG4 is housed in a 16-pin QFN package (RGT) with exposed thermal pad, optimized for high-frequency layout and thermal dissipation in compact PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4520RGTTG4, THS4521RGTT offers identical functionality in a drop-in package with modest 5-V bandwidth trade-off for lower 3.3-V power, while ADA4940-1ACPZ-R7 provides higher input impedance and CMRR at the cost of non-interchangeable packaging and slightly higher distortion - making THS4520RGTTG4 optimal for speed- and noise-critical 5-V ADC driver roles.

Availability

THS4520RGTTG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless infrastructure, test and measurement instrumentation, and voice processing systems requiring stable component supply across industrial temperature ranges (–40°C to +85°C).

Supply support for THS4520RGTTG4 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 and embedded processing solutions with emphasis on precision, reliability, and energy efficiency.

The THS4520RGTTG4 belongs to TI's high-speed differential amplifier product line, engineered specifically for ultra-low distortion, wideband signal conditioning in data converter interfaces and communications infrastructure.

FAQ

What is the maximum small-signal bandwidth of the THS4520RGTTG4?

The THS4520RGTTG4 achieves a small-signal bandwidth of 620 MHz at G = 0 dB with a 5-V supply (±2.5 V). At 3.3-V supply (±1.65 V), bandwidth is 600 MHz under identical conditions. This specification is measured with RF = 499 Ω, RL = 200 Ω differential, and VO = 100 mV_PP, confirming its suitability for >200 MSPS signal chain applications where gain-flatness and phase linearity are critical.

Does the THS4520RGTTG4 support dc-coupled ADC interfaces?

Yes, the THS4520RGTTG4 supports dc-coupled ADC interfaces via its dedicated output common-mode control (CM) pins. When configured, it maintains output common-mode voltage within ±0.25 mV of the applied CM reference - enabling direct connection to ADCs like the ADS8860 or AD7960 without external level-shifting components or calibration. The CM input accepts voltages from –1.5 V to +1.5 V and defaults to mid-supply when left open.

What is the harmonic distortion performance of the THS4520RGTTG4 at 100 kHz?

At 100 kHz, the THS4520RGTTG4 delivers –115 dBc second-harmonic distortion (HD2) and –123 dBc third-harmonic distortion (HD3) with 8 V_PP differential output into a 1-kΩ load at 5-V supply. These values are measured under G = –1, V_OD = 8 V_PP, and V_S = ±2.5 V, reflecting its capability to preserve SFDR in narrowband IF and baseband signal paths where spectral purity is paramount.

How does the power-down feature of the THS4520RGTTG4 operate?

The THS4520RGTTG4 enters low-power mode when the PD pin is driven logic low (≤ –1.5 V referenced to VS–); quiescent current drops to 15 μA (typical). When PD is open or high (>1.5 V), the device operates normally with 14.2 mA typical supply current. The PD pin has internal pull-up, so an unconnected pin defaults to enabled state - simplifying design in always-on configurations while allowing controlled shutdown in power-managed systems.

What package type and thermal characteristics does the THS4520RGTTG4 use?

The THS4520RGTTG4 uses a 16-pin QFN package (RGT) with an exposed thermal pad. Its thermal resistance is θ_JA = 39.5°C/W and θ_JC = 2.4°C/W at TA ≤25°C. The exposed pad must be soldered to a thermally robust PCB copper area to ensure junction temperature remains below 125°C during continuous operation - especially critical when driving heavy loads at high slew rates that generate significant die power dissipation.