Texas Instruments THS4130CDGNRG4

Overview

THS4130CDGNRG4 from Texas Instruments is a fully differential amplifier (FDA) designed for high-speed, low-noise signal conditioning in precision analog front-ends. It delivers 170 MHz small-signal bandwidth, 51 V/µs slew rate, and –102 dBc THD at 250 kHz with ±15 V supplies, enabling high-fidelity differential ADC driving in medical ultrasound and instrumentation systems.

For engineers reviewing the THS4130CDGNRG4 datasheet, THS4130CDGNRG4 pinout, THS4130CDGNRG4 application, or THS4130CDGNRG4 equivalent, key selection criteria include its active power-down capability, 1.25 nV/√Hz input voltage noise, HVSSOP-8 thermal performance (R_θJA = 57.6 °C/W), and differential output impedance behavior in shutdown mode.

Technical Context

The THS4130CDGNRG4 implements a true fully differential signal path from input to output using TI's high-voltage complementary bipolar process, supporting supply voltages from ±2.5 V to ±15 V (or 5–30 V single-ended). Its architecture includes an internal V_OCM error amplifier that sets output common-mode voltage independently of gain configuration.

It features an active-low power-down pin (PD) referenced to V_CC–, with threshold ~1.4 V above V_CC–; when asserted, output impedance exceeds 1 MΩ and quiescent current drops to 0.86 mA. The device maintains 95 dB CMRR at 800 kHz and achieves 108 dB SFDR at ±15 V with 2 V_PP output.

Key Specifications

Pinout & Package

HVSSOP-8 (DGN) package with exposed thermal pad on underside; requires connection to large copper plane for optimal thermal dissipation (R_θJB = 30.0 °C/W). Pin 1 is VIN+, pin 7 is PD (active-low power-down), and thermal pad is electrically isolated.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4130CDGNRG4, THS4561IRGET offers superior voltage noise but lacks power-down and thermal-pad packaging, while LMH5401RTVT trades precision DC performance for RF bandwidth and eliminates VOCM programmability-making THS4130CDGNRG4 optimal for thermally constrained, power-aware, wide-dynamic-range baseband systems.

Availability

THS4130CDGNRG4 is available at Aetrix Electronics and suitable for medical imaging, test & measurement instrumentation, and high-fidelity data acquisition systems requiring stable component supply across extended temperature ranges (–40°C to +85°C) and long production lifecycles.

Supply support for THS4130CDGNRG4 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 signal-chain solutions.

The THS413x family was engineered specifically for demanding differential signal conditioning in ultrasound, instrumentation, and communications infrastructure-emphasizing low distortion, wide bandwidth, and robust thermal design in compact packages.

FAQ

What is the function of the VOCM pin on the THS4130CDGNRG4?

The VOCM pin on the THS4130CDGNRG4 sets the output common-mode voltage level. When driven by a low-impedance source, it directly programs the midpoint of the differential output swing (VOUT+ + VOUT–)/2. If left floating, VOCM defaults to (VCC+ + VCC–)/2. A 0.1-µF bypass capacitor is recommended to minimize noise coupling. This feature allows precise alignment with ADC input common-mode requirements without external resistive dividers.

Does the THS4130CDGNRG4 support single-supply operation?

Yes, the THS4130CDGNRG4 supports single-supply operation from 5 V to 30 V. In this configuration, VCC– connects to ground, and VCC+ connects to the positive rail. The device maintains full differential functionality, including VOCM control and power-down, provided the input and output signal ranges remain within the specified common-mode limits (e.g., VICM = –3.77 V to 4.3 V at 5 V supply). Performance metrics like bandwidth and THD remain consistent with dual-supply operation.

How does the power-down feature affect output impedance in the THS4130CDGNRG4?

When the PD pin is asserted low, the THS4130CDGNRG4 enters high-impedance state: differential output impedance exceeds 1 MΩ across frequency, effectively isolating the amplifier outputs from downstream circuitry. This behavior is confirmed in Figure 8-4 of the datasheet, showing >3 kΩ impedance even at 100 MHz. The high-Z state minimizes loading on connected filters or ADC inputs during idle periods, reducing system power without requiring external switches or relays.

What thermal considerations apply to the THS4130CDGNRG4 in HVSSOP-8 package?

The THS4130CDGNRG4 in HVSSOP-8 (DGN) package requires connection of its exposed thermal pad to a large copper plane to achieve rated thermal performance: R_θJB = 30.0 °C/W. Without proper pad soldering and thermal vias, junction temperature can exceed 125°C under 100 mW dissipation at +85°C ambient. TI recommends minimum 4×4 mm² copper area with ≥4 thermal vias (0.3 mm diameter) to the inner ground plane to ensure reliable long-term operation per SLMA002/SLMA004 guidelines.

Can the THS4130CDGNRG4 drive capacitive loads directly?

No-capacitive loads >10 pF require series isolation resistors at each output to maintain stability. The THS4130CDGNRG4 is internally compensated for maximum bandwidth, making it susceptible to ringing or oscillation when driving capacitive loads directly. Figure 9-1 specifies a 20 Ω resistor in series with each output; for 50 Ω systems, use 50 Ω to simultaneously isolate capacitance and match line impedance. This mitigation preserves phase margin and ensures clean transient response in ADC driver or filter interface roles.