Texas Instruments THS4151IDGNR

Overview

THS4151IDGNR from Texas Instruments is a high-speed fully differential amplifier optimized for ADC driver, antialiasing filter, and differential signal conditioning applications. It delivers 150 MHz –3 dB bandwidth (VCC = ±5 V), 650 V/µs slew rate (VCC = ±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 THS4151IDGNR datasheet, THS4151IDGNR pinout, THS4151IDGNR application, or THS4151IDGNR equivalent, key selection considerations include differential output swing (±3.6 V min at ±5 V), VOCM-controlled common-mode level setting, resistor-matched gain configuration (Rf/Rg), and MSOP PowerPAD™ thermal performance under high-frequency load conditions.

Technical Context

The THS4151IDGNR 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 ratios.

Operation requires matched feedback and gain-setting resistors (e.g., Rf = 390 Ω, Rg = 390 Ω for G = 1) to preserve CMRR (>–83 dB), PSRR (>65 dB), and distortion performance. The VOCM pin directly sets output common-mode voltage-internally biased to midrail if left floating-and must be bypassed with a 0.1-µF capacitor for stability.

Key Specifications

Pinout & Package

The THS4151IDGNR is housed in an 8-pin MSOP PowerPAD™ package (DGN), featuring exposed thermal pad for enhanced junction-to-board heat transfer. Thermal resistance θJA = 58.4°C/W enables 1.71 W power dissipation at TA = 25°C.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4131IDGNR and THS4141IDGNR, the THS4151IDGNR uniquely balances ultra-high slew rate (650 V/µs) with competitive noise (7.6 nV/√Hz) and distortion (–83 dB THD), making it optimal for time-critical, high-fidelity ADC driving where both speed and spectral purity are simultaneously constrained.

Availability

THS4151IDGNR is available at Aetrix Electronics and suitable for high-speed data acquisition systems, differential antialiasing filters, single-supply sensor interfaces, industrial analog transmitters, and precision test equipment requiring stable component supply and long-term manufacturability.

Supply support for THS4151IDGNR 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 high-speed amplifier design and manufacturing.

The THS415x family was engineered specifically for demanding differential signal conditioning in data converter interfaces, emphasizing distortion-limited bandwidth, VOCM flexibility, and robust thermal packaging for continuous high-frequency operation.

FAQ

What is the maximum recommended supply voltage for the THS4151IDGNR?

The THS4151IDGNR supports absolute maximum supply voltages of ±16.5 V across VCC+ and VCC−. However, for reliable long-term operation and to maintain specified distortion and thermal performance, the recommended operating range is ±2.5 V to ±15 V dual supply or 5 V single supply. Exceeding ±15 V may increase junction temperature beyond 125°C and degrade THD and reliability.

Does the THS4151IDGNR require external shutdown control?

No-the THS4151IDGNR does not include a shutdown pin. Unlike the THS4150IDGNR (which features a PD pin), the THS4151IDGNR lacks power-down functionality. Its quiescent current remains fixed at 18.5 mA typical (±5 V) and cannot be reduced via external logic. For low-power applications requiring shutdown, the THS4150IDGNR or alternate family members should be considered instead of the THS4151IDGNR.

How should the VOCM pin be configured for single-supply operation of the THS4151IDGNR?

For 5 V single-supply operation, the VOCM pin should be bypassed with a 0.1 µF ceramic capacitor to ground. When left unconnected, VOCM defaults internally to VCC/2 = 2.5 V, establishing the output common-mode level. This configuration enables proper differential output swing centered at 2.5 V, matching the input range of many 5 V ADCs without external biasing circuitry.

Can the THS4151IDGNR drive a 50 Ω transmission line directly?

No-the THS4151IDGNR output stage is not designed for direct 50 Ω termination. To drive 50 Ω loads or transmission lines, a series isolation resistor (≥20 Ω) must be placed between each output (VOUT+, VOUT−) and the load. This prevents capacitive loading-induced instability and provides source-end impedance matching, as confirmed in the "Driving a Capacitive Load" section of the THS4151IDGNR datasheet.

What resistor tolerance is required to maintain THS4151IDGNR's specified CMRR and distortion performance?

To preserve the THS4151IDGNR's –83 dB CMRR and low THD, external feedback and gain-setting resistors must be matched to ≤0.1% ratio tolerance. While 1% resistors meet basic functionality, 0.1% thin-film or matched-pair arrays are required to minimize resistor-induced imbalance that degrades second-harmonic cancellation and common-mode rejection-critical for high-fidelity ADC driver applications.