Texas Instruments THS4140IDG4

Overview

THS4140IDG4 from Texas Instruments is a high-speed fully differential amplifier designed for precision signal conditioning in data acquisition systems. It delivers 160 MHz –3 dB bandwidth (±15 V supply), 450 V/µs slew rate, –79 dB third-harmonic distortion at 1 MHz, and 6.5 nV/√Hz input-referred voltage noise - enabling high-fidelity differential ADC driving in instrumentation and communications infrastructure.

For engineers reviewing the THS4140IDG4 datasheet, THS4140IDG4 pinout, THS4140IDG4 application, or THS4140IDG4 equivalent, key selection criteria include shutdown current (0.88 mA), VOCM-controlled output level shifting, balanced differential output rejection of common-mode noise, and MSOP PowerPAD™ thermal performance with validated DGN-8 package layout.

Technical Context

The THS4140IDG4 implements a true fully differential signal path from input to output using TI's BiComI complementary bipolar process, ensuring symmetrical gain and phase response across both signal paths. Its architecture supports single-ended-to-differential conversion, differential antialiasing filtering, and output common-mode voltage control via the VOCM pin.

It features an active-low power-down (PD) pin that reduces quiescent current to 0.88 mA while placing outputs in high-impedance state (>1 MΩ), and operates across ±2.5 V to ±15 V dual supplies or 5 V to 30 V single supply - with specified performance over –40°C to +85°C industrial temperature range.

Key Specifications

Pinout & Package

THS4140IDG4 is housed in an 8-pin MSOP PowerPAD™ package (DGN-8), featuring an exposed thermal pad on the underside for enhanced heat dissipation. The package requires soldering the thermal pad to a PCB copper plane per TI SLMA002/SLMA004 guidelines to maintain junction temperature ≤125°C under continuous operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4141IDG4 (no shutdown) and THS4131IDG4 (lower speed/noise trade-off), THS4140IDG4 uniquely combines industrial-temp rated shutdown capability, 160 MHz bandwidth, and 6.5 nV/√Hz noise - making it optimal for thermally constrained, high-fidelity, power-aware systems.

Availability

THS4140IDG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, industrial process monitoring, and automated test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for THS4140IDG4 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 amplifier design and manufacturing.

The THS414x product line was engineered specifically for high-fidelity differential signal conditioning in precision data converters and communications systems - emphasizing bandwidth, distortion performance, and thermal robustness in compact packages.

FAQ

What is the function of the PD pin on the THS4140IDG4?

The PD (Power-Down) pin on the THS4140IDG4 is an active-low control that places the amplifier in low-power shutdown mode when pulled below 1.4 V above VCC−. In this state, quiescent current drops to 0.88 mA and outputs enter high-impedance (>1 MΩ), enabling selective channel disabling. THS4140IDG4 requires explicit connection of PD to VCC− for shutdown; leaving it unconnected keeps the device active due to an internal 50 kΩ pull-up to VCC.

How does the VOCM pin affect THS4140IDG4 output behavior?

The VOCM pin on THS4140IDG4 sets the common-mode DC voltage level of both differential outputs (VOUT+ and VOUT−). When left unconnected, VOCM defaults to midrail (e.g., VCC/2 for single supply). Applying an external voltage allows precise alignment to ADC reference levels - critical for maximizing dynamic range and avoiding clipping. THS4140IDG4 maintains VOCM bandwidth up to the amplifier's operating range, but requires a 0.1 µF bypass capacitor for stability against noise injection.

Can THS4140IDG4 operate from a single 5-V supply?

Yes, THS4140IDG4 supports single-supply operation from 5 V to 30 V. With 5 V supply, VOCM defaults to 2.5 V, and output swing is specified as 1.2 V to 3.8 V (TA = 25°C). Input common-mode range is –4 V to 4.5 V, allowing ground-referenced inputs. THS4140IDG4 maintains –78 dB THD at 1 MHz under these conditions, making it suitable for portable and space-constrained systems without dual rails.

What thermal considerations apply to the THS4140IDG4 DGN-8 package?

The THS4140IDG4 uses an MSOP PowerPAD™ (DGN-8) package with an exposed thermal pad requiring soldering to a PCB copper plane. Per TI SLMA002/SLMA004, this pad must connect to a thermally conductive plane to achieve θJC = 4.7°C/W and sustain 1.71 W at TA = 25°C. Failure to thermally anchor the pad risks exceeding the 125°C maximum junction temperature, degrading distortion performance and long-term reliability. THS4140IDG4 thermal design must include dedicated vias under the pad and sufficient copper area.

How does THS4140IDG4 differ from THS4141IDG4 beyond the PD pin?

THS4140IDG4 and THS4141IDG4 share identical AC/DC specifications, pinout, package, and temperature range (–40°C to +85°C). The sole functional difference is the presence of the PD pin on THS4140IDG4 - absent on THS4141IDG4. All electrical parameters (bandwidth, THD, noise, slew rate, CMRR) are identical per SLOS320F datasheet. THS4140IDG4 is the only variant offering shutdown capability in the THS414x family.