Texas Instruments THS4141CDGK

Overview

THS4141CDGK from Texas Instruments is a high-speed fully differential amplifier in an 8-pin MSOP PowerPAD™ package, delivering 160 MHz –3 dB bandwidth (±15 V supply), 450 V/µs slew rate, and –79 dB third-harmonic distortion at 1 MHz. It serves as a precision differential ADC driver in data acquisition systems requiring low noise (6.5 nV/√Hz) and balanced output common-mode rejection.

For engineers reviewing the THS4141CDGK datasheet, THS4141CDGK pinout, THS4141CDGK application, or THS4141CDGK equivalent, this page provides verified specifications, validated pin functions, confirmed differential I/O use cases, and two rigorously cross-checked alternative parts for ADC interface and antialiasing filter design.

Technical Context

The THS4141CDGK implements a true fully differential signal path-differential input to differential output-with symmetrical internal topology that inherently rejects common-mode noise at both input and power supply rails. Its VOCM pin enables precise control of output common-mode voltage, supporting single-supply (5 V) and dual-supply (±15 V) operation while maintaining >75 dB CMRR across temperature.

Unlike conventional op-amps, it operates without internal feedback; external resistor networks set gain and define input/output impedance. The device lacks shutdown functionality (unlike THS4140), eliminating power-down timing considerations but requiring continuous bias current management (16 mA typical ICC at ±5 V).

Key Specifications

Pinout & Package

THS4141CDGK uses an 8-pin MSOP PowerPAD™ (DGK) package with exposed thermal pad on underside. The PowerPAD must be soldered to a thermally conductive copper plane for junction temperature control; θJC = 54.2°C/W.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar differential ADC driver applications.

Compared with THS4131CDGN and LMH6554MA/NOPB, THS4141CDGK uniquely balances 160 MHz bandwidth, –79 dB THD, and integrated VOCM control-making it the only option among the three that supports direct DC-coupled, rail-to-rail common-mode adjustable drive of mid-speed differential ADCs without external components.

Availability

THS4141CDGK is available at Aetrix Electronics and suitable for high-speed data acquisition, medical ultrasound beamforming, digital communications transceivers, and test & measurement equipment requiring stable component supply across industrial temperature ranges (0°C to 70°C).

Supply support for THS4141CDGK 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 over 50 years of innovation in high-performance amplifiers and data converter interfaces.

The THS414x family was designed specifically for precision differential signal conditioning in high-speed ADC front-ends, emphasizing distortion performance, common-mode control, and thermal robustness in compact packages.

FAQ

What is the function of the VOCM pin on the THS4141CDGK?

The VOCM pin on the THS4141CDGK sets the DC common-mode voltage of both differential outputs. When left unconnected, it defaults to midrail (e.g., 2.5 V on 5 V supply). For optimal noise immunity, TI recommends bypassing VOCM to ground with a 0.1 µF ceramic capacitor. This pin enables seamless interfacing with ADCs having varying reference voltages without external level shifters - a core capability of the THS4141CDGK.

Does the THS4141CDGK include a shutdown feature like the THS4140?

No, the THS4141CDGK does not include a shutdown (PD) pin or power-down mode. Unlike the THS4140, which features an active-low PD terminal drawing only 880 µA in shutdown, the THS4141CDGK operates continuously. Its quiescent current is 16 mA at ±5 V. Designers must plan for constant power draw and thermal management - a deliberate trade-off for simplified biasing and elimination of power-state transition artifacts in the THS4141CDGK.

What is the maximum differential load resistance supported by the THS4141CDGK?

The THS4141CDGK maintains specified performance up to 800 Ω differential load (i.e., 400 Ω per output to ground). At ±15 V supply, it delivers ±12.9 V swing into 800 Ω. Driving higher loads (e.g., 1 kΩ) reduces output current demand and improves thermal margin but does not extend voltage swing beyond datasheet limits. Load matching between VOUT+ and VOUT− paths is critical - mismatch >1% degrades CMRR and harmonic suppression in the THS4141CDGK.

Can the THS4141CDGK be used with a single 3.3 V supply?

No, the THS4141CDGK minimum supply is 5 V single-ended or ±2.5 V dual supply. Operation at 3.3 V violates the absolute maximum rating for supply voltage (±2.5 V min dual, 5 V min single) and will result in undefined output behavior, reduced bandwidth, and potential latch-up. For 3.3 V systems, consider TI's THS4561 (3.3 V–5.25 V supply, 1.5 GHz GBW) - but note it lacks VOCM control and is not a functional replacement for the THS4141CDGK.

Why does the THS4141CDGK require matched external resistors?

Resistor matching directly impacts CMRR, PSRR, and second-harmonic distortion cancellation in the THS4141CDGK. A 1% mismatch in feedback or gain resistors degrades CMRR by >20 dB and increases even-order distortion by >10 dB. TI specifies 1% tolerance or better for Rf and Rg networks - using 0.1% thin-film resistors is recommended for applications demanding >80 dB CMRR over frequency. This matching requirement is intrinsic to the THS4141CDGK's fully differential architecture.