Texas Instruments THS4130CDGK

Overview

THS4130CDGK from Texas Instruments is a fully differential input/output amplifier optimized for high-speed, low-noise signal conditioning in precision analog front-ends. It delivers 170 MHz small-signal bandwidth, 51 V/µs slew rate, –102 dBc THD at 250 kHz (±15 V supply), and 1.25 nV/√Hz input voltage noise. Its active power-down pin enables dynamic power management in battery-sensitive or multi-channel systems such as ultrasound receivers and ADC driver stages.

For engineers reviewing the THS4130CDGK datasheet, THS4130CDGK pinout, THS4130CDGK application, or THS4130CDGK equivalent, this page provides verified specifications, validated pin functions for the VSSOP-8 package, real-world use cases in differential signal chains, and two confirmed alternative parts with documented functional and layout implications.

Technical Context

The THS4130CDGK implements a true fully differential architecture with matched internal gain blocks and a dedicated VOCM input that directly sets output common-mode voltage-enabling precise interface to differential ADCs without external level-shifting circuitry. Its ±15 V dual-supply capability supports high-voltage dynamic range while maintaining 95 dB CMRR at 800 kHz.

Unlike conventional op-amps, it features an integrated VCM error amplifier and internal 10-kΩ output resistors tied to that node, resulting in a closed-loop differential output impedance of [(2 × RF + 2 × RG) || 20 kΩ]. The active-low PD pin pulls quiescent current from 15 mA to 0.86 mA, placing outputs in >1 MΩ high-impedance state without disrupting bias conditions on VOCM or feedback networks.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package with exposed thermal pad (electrically isolated); 3.0 mm × 3.0 mm footprint, 0.65 mm pitch, 1.0 mm max height. Requires solder paste stencil aperture matching TI's PowerPAD guidelines for thermal reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4130CDGK, THS4561IDGKR offers superior noise performance but removes the integrated power-down function critical for battery-powered ultrasound probes, while LMH5401RTVT delivers extreme speed at the cost of increased PCB area and loss of VOCM-based level control essential for precision ADC interfacing.

Availability

THS4130CDGK is available at Aetrix Electronics and suitable for medical imaging equipment, industrial data acquisition systems, and communications infrastructure requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.

Supply support for THS4130CDGK 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 company specializing in analog and embedded processing technologies, with leadership in high-performance amplifiers, data converters, and power management ICs.

The THS413x product line was designed specifically for high-fidelity differential signal conditioning in demanding applications including medical ultrasound, test equipment, and high-speed data acquisition-emphasizing noise, distortion, and common-mode rejection over generic op-amp functionality.

FAQ

What is the function of the VOCM pin on the THS4130CDGK?

The VOCM (Voltage Output Common-Mode) pin on the THS4130CDGK directly sets the DC midpoint voltage of the differential output pair (VOUT+ and VOUT–). Applying a stable, low-impedance voltage to this pin-such as from a precision reference or filtered DAC output-ensures the THS4130CDGK's outputs center at the required level for downstream components like differential ADCs. If left unconnected, VOCM defaults to (VCC+ + VCC–)/2. A 0.1-µF bypass capacitor is mandatory to suppress noise coupling into the common-mode control loop.

Does the THS4130CDGK support single-supply operation?

Yes, the THS4130CDGK supports single-supply operation from 5 V to 30 V. In this configuration, VCC– is connected to ground, and VCC+ receives the positive rail. The device maintains full differential functionality, including VOCM control and power-down capability. Input common-mode range extends from –3.77 V to +4.3 V (at 5 V supply), and output swing reaches 1.2 V to 3.8 V (RL = 1 kΩ), making it suitable for interfacing with single-supply ADCs and microcontrollers without level-shifting circuitry.

How does the power-down feature affect output behavior in the THS4130CDGK?

When the PD pin is pulled low (≤ VCC– + 1.4 V), the THS4130CDGK enters power-down mode, reducing quiescent current to 0.86 mA and placing both VOUT+ and VOUT– into a high-impedance state (>1 MΩ). Critically, the internal bias network remains active-VOCM retains its set voltage, and feedback resistors stay loaded-so the amplifier resumes normal operation within microseconds of PD release, with no output glitches or settling delay. This behavior enables rapid channel multiplexing in multi-channel ultrasound receivers.

What package type does the THS4130CDGK use, and what thermal considerations apply?

The THS4130CDGK uses the DGK package: an 8-pin VSSOP with an exposed thermal pad. Its RθJA is 147.3°C/W, significantly higher than the HVSSOP (DGN) variant (57.6°C/W), so thermal design must prioritize copper area under the pad. TI recommends connecting the thermal pad to a large internal or bottom-layer ground plane via ≥4 thermal vias (0.3-mm diameter, spaced ≤1 mm apart). Failure to do so risks junction temperatures exceeding 125°C under continuous 15-mA operation at +85°C ambient.

Can the THS4130CDGK drive capacitive loads, and what layout guidance applies?

The THS4130CDGK is not unity-gain stable into purely capacitive loads >10 pF due to its internal compensation optimized for bandwidth. To drive such loads-including ADC input capacitance or PCB trace capacitance-add a 20-Ω series resistor at each output (VOUT+ and VOUT–), placed as close as possible to the DGK package pins. This isolates the amplifier from the capacitive reactance, restoring phase margin and preventing ringing or oscillation. For 50-Ω transmission lines, use 50-Ω series resistors to simultaneously provide isolation and source termination.