Texas Instruments THS4541YR

Overview

THS4541YR from Texas Instruments is a negative-rail-input, rail-to-rail-output fully differential amplifier (FDA) optimized for high-speed, low-power ADC driving in SAR, ΔΣ, and pipeline architectures. It delivers 500 MHz small-signal bandwidth at G = 2 V/V, 1500 V/µs slew rate, –95 dBc HD2 at 10 MHz (2 VPP), and operates from a single 2.7–5.4 V supply with 10.1 mA quiescent current - enabling compact, ground-referenced signal conditioning in data acquisition systems.

For engineers reviewing the THS4541YR datasheet, THS4541YR pinout, THS4541YR application, or THS4541YR equivalent, this page provides verified circuit role, die-level package mapping, validated pin functions, real-world distortion and noise performance, and two confirmed alternative FDAs for precision DC- or AC-coupled ADC interface designs.

Technical Context

The THS4541YR implements a voltage-feedback architecture with a decompensated core delivering 850 MHz gain-bandwidth product and 340 MHz large-signal (2 VPP) bandwidth. Its PNP input stage enables true negative-rail input operation (down to Vs–), while collector-based outputs achieve rail-to-rail swing with only 0.2 V headroom to each rail.

A dedicated Vocm control loop - with 150 MHz small-signal bandwidth and 400 V/µs slew rate - actively regulates output common-mode voltage from 0.91 V above Vs– to 1.1 V below Vs+, supporting modern ADC input requirements. The CMOS power-down pin (PD) reduces quiescent current to 2 µA when pulled to Vs–, with 100 ns turn-on delay and no internal pullup/pulldown.

Key Specifications

Pinout & Package

Bare die in tape-and-reel format, 1198 µm × 1006 µm × 381 µm thick, AlCu metallization, 85 µm × 85 µm bond pads. Designed for chip-on-board (COB), multi-chip modules (MCM), and system-in-package (SiP) integration with minimal footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4541YR, THS4561DGNR trades 33% higher quiescent current for 118% greater gain-bandwidth, while LMH5401RTAR abandons negative-rail input and integrated Vocm to achieve higher speed - making THS4541YR the optimal choice for low-power, DC-coupled, precision ADC interface designs demanding <10 µA standby and <1 µV/°C drift.

Availability

THS4541YR is available at Aetrix Electronics and suitable for high-density MCM/SiP assemblies, portable data acquisition systems, and industrial ADC interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for THS4541YR 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, embedded processing, and high-performance signal chain solutions, with decades of expertise in precision amplifiers and data converter interfaces.

The THS4541YR belongs to TI's high-speed, low-power fully differential amplifier product line, engineered specifically for ground-referenced, DC-coupled ADC/DAC interface applications in space-constrained, thermally sensitive systems.

FAQ

What is the maximum differential output voltage swing for THS4541YR at 5-V supply?

The THS4541YR delivers rail-to-rail output swing with only 0.2 V headroom to each rail. At a 5-V single supply (Vs+ = 5 V, Vs– = GND), the guaranteed differential output voltage swing is 4.6 VPP (from 0.2 V to 4.8 V on each output, differential peak-to-peak). This is confirmed in Section 7.3 under "Output voltage low/high" and Figure 7-21 showing >4.5 VPP into 500 Ω at 5 V.

Does THS4541YR support true DC-coupled operation with ground-referenced inputs?

Yes. The THS4541YR features negative-rail input (NRI) architecture with input common-mode range extending to Vs–, enabling direct DC coupling of ground-centered, bipolar signals (e.g., ±2.5 V sensor outputs) without external level-shifting circuitry. This is explicitly stated in the device description and validated in Section 7.3 "Common-mode input low" specification: (Vs–) – 0.2 V minimum.

How does the Vocm pin function when left unconnected on THS4541YR?

When the Vocm pin is left unconnected (floating), the THS4541YR defaults to midsupply common-mode output voltage via an internal 100 kΩ resistor divider between Vs+ and Vs–. Per Section 7.3, the default offset is ±8 mV from (Vs+ – Vs–)/2, and Figure 7-23 shows statistical distribution centered at +6.8 mV (5 V supply). This eliminates need for external biasing in most ADC interface applications.

What is the power-down behavior of THS4541YR during active signal injection?

When THS4541YR is disabled (PD ≤ Vs– + 0.7 V), its amplifier core shuts down, reducing quiescent current to 2 µA, but the external feedback resistors remain in-path. Input signals applied during power-down appear attenuated at the outputs through the passive resistor network - not amplified. This behavior is documented in Section 8.1 and Figure 7-25/7-26 waveforms showing residual output during PD assertion.

Can THS4541YR drive a 50-Ω differential load directly?

No. The THS4541YR is specified for R_L ≥ 500 Ω (differential) per Section 7.3 and Figure 7-4/7-9. Driving 50 Ω would exceed its ±100 mA output current limit and degrade distortion (HD2/HD3 worsen >10 dB at low R_L). For 50-Ω systems, use external 1:4 impedance-matching transformers or add series termination to meet the 500-Ω minimum load requirement.