Texas Instruments THS4531IDGK

Overview

THS4531IDGK from Texas Instruments is an ultra-low-power, fully-differential amplifier with rail-to-rail output and negative-rail input capability. It delivers 36 MHz bandwidth, 200 V/µs slew rate, and –120 dBc THD at 1 kHz (1 VRMS), operating from 2.5 V to 5.5 V supply while consuming only 250 µA quiescent current. It is optimized for low-power SAR and ΔΣ ADC driver applications in high-channel-count industrial and data acquisition systems.

For engineers reviewing the THS4531IDGK datasheet, THS4531IDGK pinout, THS4531IDGK application, or THS4531IDGK equivalent, this page provides verified specifications, package-confirmed pin functions, real-world differential signal conditioning use cases, and two validated alternative parts with documented functional and application-level differences.

Technical Context

The THS4531IDGK implements a fully-differential architecture with independent VOCM control, enabling precise DC-coupled interfacing to ADCs without level-shifting circuitry. Its input common-mode range extends 0.2 V below the negative rail and up to 1.2 V below the positive rail, supporting single-ended ground-referenced sources directly.

It integrates a dedicated power-down pin (PD) that reduces quiescent current to 0.5 µA typical, with 600 ns turn-on delay and 15 ns turn-off delay. Output balance error is –67 dB at 1 MHz, and closed-loop differential output impedance is 2.5 Ω at 1 MHz - critical for driving mismatch-sensitive ADC inputs.

Key Specifications

Pinout & Package

VSSOP-8 (DGK) package: 3.00 mm × 3.00 mm body, 0.65 mm pitch, exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4531IDGK, THS4521IDGK trades 4.5× higher power for 4× bandwidth and eliminates NRI capability, while THS4551IRGTR improves distortion by 6 dB but removes NRI and increases supply current 5.5× - making THS4531IDGK uniquely suited for single-supply, ultra-low-power, ground-referenced differential signal conditioning.

Availability

THS4531IDGK is available at Aetrix Electronics and suitable for low-power data acquisition systems, portable instrumentation, and high-channel-count industrial sensor interfaces requiring stable component supply and extended temperature support (–40°C to +125°C).

Supply support for THS4531IDGK 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 precision amplifiers, data converters, and power management ICs.

The THS4531IDGK belongs to TI's ultra-low-power fully-differential amplifier product line, designed specifically for energy-constrained, high-density data acquisition systems where rail-to-rail output, negative-rail input, and sub-300 µA operation are mandatory.

FAQ

What is the maximum operating temperature range for the THS4531IDGK?

The THS4531IDGK is characterized and guaranteed for continuous operation from –40°C to +125°C ambient temperature. This extended industrial temperature range is validated across all electrical specifications including input offset drift (±2 µV/°C), PSRR (87–108 dB), and output drive capability (±15 mA), making THS4531IDGK suitable for under-hood automotive sensors and factory-floor industrial controllers.

Does the THS4531IDGK support true single-supply operation with ground-referenced inputs?

Yes - the THS4531IDGK features Negative Rail Input (NRI), allowing its inputs to operate down to VS– – 0.2 V. When powered from a single 2.5–5.5 V supply with VS– = 0 V, THS4531IDGK accepts ground-referenced (0 V) input signals directly without level-shifting circuitry, unlike most differential amplifiers that require input biasing above ground.

How does the VOCM pin function in the THS4531IDGK, and what is its accuracy?

The VOCM pin in THS4531IDGK sets the common-mode voltage of the differential output pair with 0.99–1.01 V/V gain and ±1 mV offset error. Its input range is 0.95 V to 4.0 V at VS = 5 V, and it maintains ±5 mV max offset over temperature. This precision enables direct DC-coupled connection to ADCs like the ADS127L01 without external resistive dividers or calibration.

What is the power-down behavior of the THS4531IDGK, and how fast does it recover?

When the PD pin is pulled ≤0.7 V, THS4531IDGK enters power-down mode drawing 0.5 µA typical. Turn-off delay is 15 ns; turn-on delay (to 90% of final output) is 600 ns with RL = 200 Ω. During shutdown, outputs enter high-impedance state - preventing loading of downstream ADC inputs and eliminating cross-talk in multiplexed systems.

Can the THS4531IDGK drive standard 600 Ω differential ADC inputs, and what is its output impedance?

Yes - THS4531IDGK drives 600 Ω differential loads with <0.1-dB flatness to 15 MHz at VS = 5 V. Its closed-loop differential output impedance is 2.5 Ω at 1 MHz, ensuring minimal gain error and phase mismatch when terminating into typical ADC input impedances (e.g., 1 kΩ || 5 pF). Layout best practices recommend symmetric 50-Ω microstrip routing to preserve balance.