Texas Instruments THS4150IDGNR

Overview

THS4150IDGNR from Texas Instruments is a high-speed fully differential amplifier optimized for ADC driving, antialias filtering, and differential signal conditioning in precision data acquisition systems. It delivers 150 MHz –3 dB bandwidth at ±5 V supply, 650 V/µs slew rate at ±15 V, –83 dB total harmonic distortion at 1 MHz, 7.6 nV/√Hz input-referred voltage noise, and operates from ±2.5 V to ±15 V dual supply or 5 V single supply.

For engineers reviewing the THS4150IDGNR datasheet, THS4150IDGNR pinout, THS4150IDGNR application, or THS4150IDGNR equivalent, key selection criteria include differential output swing (±3.6 V at ±5 V), shutdown current (1.3 mA), VOCM terminal functionality for common-mode level setting, and MSOP PowerPAD™ package thermal performance with θJA = 58.4 °C/W.

Technical Context

The THS4150IDGNR 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 and suppression of even-order harmonics. Its internal architecture supports both differential-input/differential-output and single-ended-input/differential-output configurations with gain set by external resistor networks (e.g., Rf = 390 Ω, Rg = 390 Ω for unity gain).

Operation requires precise resistor matching (≤1% tolerance recommended) to preserve CMRR, PSRR, and second-harmonic cancellation. The VOCM pin sets output common-mode voltage-internally biased to midrail when floating-and must be bypassed with a 0.1 µF capacitor for noise immunity and stability across frequency.

Key Specifications

Pinout & Package

THS4150IDGNR is housed in an 8-pin MSOP PowerPAD™ package (DGN), featuring an exposed thermal pad on the underside that must be soldered to a PCB copper pour for effective heat dissipation. Thermal resistance is θ_JA = 58.4 °C/W and θ_JC = 4.7 °C/W, enabling 1.71 W power dissipation at 25°C ambient.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4131IDGNR and THS4141IDGNR, THS4150IDGNR offers the best balance of high slew rate (650 V/µs), moderate noise (7.6 nV/√Hz), and robust distortion performance (–83 dB THD), making it optimal for general-purpose high-speed ADC driving where both speed and linearity are critical.

Availability

THS4150IDGNR is available at Aetrix Electronics and suitable for high-speed data acquisition, industrial sensor signal conditioning, and test equipment design requiring stable component supply, consistent parametric performance across temperature, and long-term production continuity.

Supply support for THS4150IDGNR 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 over 50 years of innovation in amplifier design.

The THS415x family was developed specifically for high-fidelity differential signal conditioning in data converter interfaces, emphasizing bandwidth, linearity, and flexible power-supply operation across industrial and instrumentation applications.

FAQ

What is the function of the VOCM pin on the THS4150IDGNR?

The VOCM pin on the THS4150IDGNR sets the common-mode voltage of both differential outputs. When left unconnected, it defaults to midrail (e.g., VCC/2 for single supply). For optimal performance, TI recommends bypassing VOCM with a 0.1 µF capacitor to ground to suppress noise and maintain stability. In ADC driver applications, VOCM is often tied directly to the ADC's reference voltage (e.g., AVDD/2 or VREF) to align output DC levels precisely.

Does the THS4150IDGNR support single-supply operation?

Yes, the THS4150IDGNR supports single-supply operation from 5 V. In this mode, VOCM internally defaults to VCC/2 (2.5 V), enabling differential output swing centered at midrail. Input common-mode range is specified from V_S– + 1.5 V to V_S+ – 1.5 V, so with 5 V supply (V_S– = 0 V, V_S+ = 5 V), valid input common-mode is 1.5 V to 3.5 V. External biasing may be needed if sensor signals fall outside this window.

What is the purpose of the PD (power-down) pin on the THS4150IDGNR?

The PD pin on the THS4150IDGNR is an active-low control that places the amplifier into low-power shutdown mode, reducing quiescent current to 1.3 mA at ±5 V. Assertion of PD disables the output stage while preserving input bias conditions. Shutdown delay to output disable is 1.1 µs, and wake-up is similarly fast. This feature is valuable in battery-powered or thermally sensitive systems where intermittent operation is required.

Can the THS4150IDGNR drive heavy capacitive loads directly?

No, the THS4150IDGNR should not drive capacitive loads >10 pF directly due to reduced phase margin that can cause ringing or oscillation. TI recommends placing a minimum 20 Ω series resistor between each output (VOUT+, VOUT−) and the load. This isolates the amplifier from capacitance while also providing source-end impedance matching in 50 Ω transmission systems. Layout symmetry and ground plane integrity remain critical for maintaining differential balance.

How does resistor matching affect THS4150IDGNR performance?

Resistor matching directly impacts THS4150IDGNR's CMRR, PSRR, and second-harmonic distortion. Mismatch in feedback (Rf) or gain-setting (Rg) resistors unbalances the differential path, degrading noise rejection and linearity. TI specifies ≤1% tolerance resistors for optimal performance. For example, with Rf = Rg = 390 Ω, a 0.1% mismatch introduces measurable degradation in THD at high frequencies. Precision thin-film or matched-pair arrays are recommended for production designs.