Texas Instruments THS4509RGTTG4

Overview

THS4509RGTTG4 from Texas Instruments is a wideband, low-noise, fully-differential amplifier optimized for 5-V data acquisition systems. It delivers 1.9 nV/√Hz input voltage noise, –75 dBc HD2 and –80 dBc HD3 at 100 MHz (2 V_PP, G = 10 dB), and 6600 V/μs slew rate - enabling high-fidelity signal conditioning ahead of high-speed ADCs like the ADS5500.

For engineers reviewing the THS4509RGTTG4 datasheet, THS4509RGTTG4 pinout, THS4509RGTTG4 application, or THS4509RGTTG4 equivalent, key selection criteria include its 1.9 GHz small-signal bandwidth at G = 10 dB, output common-mode control with <5 mV offset, and power-down mode drawing only 0.65 mA - critical for pulsed, low-power, or DC-coupled ADC driver designs.

Technical Context

The THS4509RGTTG4 employs a fully-differential architecture with centered input common-mode range (1.1 V to 3.9 V at 5 V supply) and independent output common-mode voltage control via dedicated CM pins. Its minimum stable gain is 2 V/V (6 dB), but performance is optimized at 10 dB, where it achieves 1.9 GHz bandwidth and 2 ns 1% settling time.

It integrates a precision output common-mode feedback loop that maintains output V_OCM within ±5 mV of the applied CM reference (1.25 V–3.5 V), enabling direct DC coupling to ADCs without level-shifting circuitry. Power-down functionality reduces quiescent current from 37.7 mA to 0.65 mA with logic-controlled PD pin activation.

Key Specifications

Pinout & Package

VQFN-16 (RGT) package, 3.00 mm × 3.00 mm body size, with exposed thermal pad on underside requiring PCB thermal plane connection per TI SLMA002/SLMA004 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4509RGTTG4, THS4508RGTT offers better 3.3-V compatibility but narrower input common-mode range, while THS4513RGTT sacrifices ~200 MHz bandwidth for unity-gain stability - making THS4509RGTTG4 optimal for fixed 10-dB, 5-V, high-SFDR ADC driver roles.

Availability

THS4509RGTTG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, wireless infrastructure, medical imaging, and test & measurement applications requiring stable component supply, guaranteed long-term availability, and full industrial temperature range (–40°C to +85°C) support.

Supply support for THS4509RGTTG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The THS4509RGTTG4 belongs to TI's high-performance fully-differential amplifier product line, engineered specifically for DC-coupled, low-distortion, wideband signal conditioning in 5-V data acquisition systems interfacing to high-speed ADCs.

FAQ

What is the minimum stable gain for THS4509RGTTG4?

The THS4509RGTTG4 has a minimum stable gain of 2 V/V (6 dB). It is not unity-gain stable, and operation below this gain may result in peaking or oscillation. The device is optimized for gains of 10 dB, where it delivers 1.9 GHz bandwidth and best harmonic distortion performance - confirmed in TI's SLOS454I datasheet Section 7.5.

Does THS4509RGTTG4 support DC-coupled ADC interfaces?

Yes, THS4509RGTTG4 supports DC-coupled ADC interfaces via its dedicated CM pins (pins 4 and 9), which allow precise control of output common-mode voltage with <5 mV typical offset from the applied reference. This eliminates level-shifting circuitry when driving ADCs like the ADS5500 that require midsupply-biased differential inputs - a core feature highlighted in the device description and Section 7.5 of the datasheet.

What is the power-down current of THS4509RGTTG4?

The power-down current of THS4509RGTTG4 is 0.65 mA (typical) at +25°C, as specified in Section 7.5 of the TI SLOS454I datasheet. When the PD pin is pulled low (<0.7 V + VS−), the amplifier enters low-power mode while retaining fast turn-on (55 ns delay) and turn-off (10 μs delay) characteristics - enabling efficient power gating in burst-mode systems.

Which package does THS4509RGTTG4 use, and what thermal considerations apply?

THS4509RGTTG4 uses the VQFN-16 (RGT) package, 3.00 mm × 3.00 mm with an exposed thermal pad. Per TI SLMA002/SLMA004 guidelines, this pad must be soldered to a thermally conductive PCB plane to maintain junction temperature within limits; failure to do so risks exceeding the 150°C max T_J due to R_θJC(bot) = 7.1°C/W - a requirement explicitly stated in Section 7.4 and Section 13 of the datasheet.

How does THS4509RGTTG4 compare to THS4513RGTT in gain flexibility?

THS4509RGTTG4 requires a minimum gain of 2 V/V (6 dB) and is optimized for 10 dB, whereas THS4513RGTT is unity-gain stable (0 dB min gain). This makes THS4513RGTT suitable for gain-of-1 buffering or variable-gain stages, while THS4509RGTTG4 delivers superior bandwidth (1.9 GHz vs. 1.7 GHz at G = 10 dB) and lower distortion at fixed high-gain ADC driver roles - differences documented in TI's Device Comparison Table (Section 5).