Texas Instruments THS4141IDGKR

Overview

THS4141IDGKR from Texas Instruments is a fully differential input/differential output high-speed amplifier optimized for precision ADC driving, antialiasing, and differential signal transmission. It delivers 160 MHz –3 dB bandwidth (±15 V supply), 450 V/µs slew rate, –79 dB third-harmonic distortion at 1 MHz, 6.5 nV/√Hz input noise, and operates from ±2.5 V to ±15 V dual supply or 5 V single supply - used in high-resolution data acquisition systems.

For engineers reviewing the THS4141IDGKR datasheet, THS4141IDGKR pinout, THS4141IDGKR application, or THS4141IDGKR equivalent, key selection criteria include differential output swing (±12.9 V at ±15 V), VOCM-controlled common-mode level setting, MSOP PowerPAD™ thermal performance, and resistor-matching sensitivity for CMRR preservation in precision signal chains.

Technical Context

The THS4141IDGKR implements a true fully differential signal path from input to output using TI's BiComI complementary bipolar process, enabling balanced rejection of common-mode noise at both input and power supply nodes. Its architecture supports single-ended-to-differential conversion with gain = 1 and VOCM-defined output common-mode voltage.

Unlike standard op-amps, it features dedicated VOCM pin for precise DC-level control of differential outputs, internal symmetry that cancels second-harmonic distortion, and no shutdown pin - distinguishing it from the THS4140 (which includes PD). The device requires matched external resistors (≤1% tolerance) to maintain CMRR >75 dB and PSRR >65 dB across frequency.

Key Specifications

Pinout & Package

THS4141IDGKR is housed in an 8-pin MSOP PowerPAD™ package (DGK suffix), featuring an exposed thermal pad on the underside for enhanced heat dissipation. The PowerPAD must be soldered to a thermally conductive PCB copper area to maintain junction temperature ≤125°C under continuous operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4131IDGKR and THS4561IRGET, THS4141IDGKR provides optimal balance of bandwidth (160 MHz), slew rate (450 V/µs), and THD (–79 dB) for 100 MSPS-class data converters - making it the preferred choice where VOCM control, proven MSOP PowerPAD thermal reliability, and mature design-in support are required.

Availability

THS4141IDGKR is available at Aetrix Electronics and suitable for high-speed data acquisition, medical imaging front-ends, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges (–40°C to +85°C).

Supply support for THS4141IDGKR 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-performance amplifiers and data converter interfaces.

The THS414x family was designed specifically for high-fidelity differential signal conditioning in precision ADC driver, antialiasing, and communications infrastructure applications - emphasizing bandwidth, linearity, and thermal robustness in compact packages.

FAQ

What is the function of the VOCM pin on the THS4141IDGKR?

The VOCM pin on the THS4141IDGKR sets the common-mode DC voltage level of both differential outputs (VOUT+ and VOUT−). When left unconnected, it defaults to mid-supply (e.g., 2.5 V on 5 V single supply); for optimal performance, it should be bypassed with a 0.1 µF capacitor and driven by a low-impedance source such as an ADC reference voltage. This ensures precise alignment of the differential output to the ADC's input common-mode range - a critical requirement for THS4141IDGKR in data acquisition designs.

Does the THS4141IDGKR have a power-down feature?

No, the THS4141IDGKR does not include a power-down (PD) pin or shutdown functionality. That feature is exclusive to the THS4140 variant (e.g., THS4140IDGKR), which adds an active-low PD terminal. The THS4141IDGKR is a fixed-operating amplifier intended for continuous high-performance use - its quiescent current remains at 15–16 mA (±15 V) across temperature, with no low-power state. Designers requiring shutdown capability must select THS4140IDGKR instead of THS4141IDGKR.

What is the recommended resistor tolerance for external feedback networks used with THS4141IDGKR?

Texas Instruments specifies that external resistors in the THS4141IDGKR feedback network (R_f and R_g) must be matched to ≤1% tolerance to preserve common-mode rejection ratio (CMRR) and minimize second-harmonic distortion. Mismatch >0.5% degrades CMRR below 75 dB and increases even-order distortion - directly impacting THS4141IDGKR performance in precision applications like high-resolution ADC driving. Use 0.1% thin-film surface-mount resistors for best results, especially in production-grade THS4141IDGKR circuits.

Can THS4141IDGKR drive a capacitive load directly?

No, THS4141IDGKR should not drive capacitive loads >10 pF directly due to potential instability and high-frequency ringing. Its internal compensation optimizes bandwidth and slew rate but reduces phase margin under capacitive loading. For loads exceeding 10 pF - including PCB traces, cables, or ADC input capacitance - a series isolation resistor (≥20 Ω, typically 33–50 Ω) must be placed at each output (VOUT+, VOUT−) per TI's recommended layout. This maintains stability while preserving THS4141IDGKR's specified 160 MHz bandwidth and settling performance.

What thermal considerations apply to the THS4141IDGKR in DGK package?

The THS4141IDGKR in DGK (MSOP PowerPAD™) package requires soldering of its exposed thermal pad to a dedicated PCB copper pour connected to internal ground or thermal plane. Without this, θ_JA rises to 260°C/W - risking junction temperatures >125°C at moderate power dissipation. TI mandates thermal vias under the pad (≥4× 0.3 mm diameter) to inner layers for reliable operation. This thermal management is essential to sustain THS4141IDGKR's full 160 MHz bandwidth and low-distortion performance across –40°C to +85°C ambient conditions.