Texas Instruments THS4531AIDR

Overview

THS4531AIDR 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 (G = 1 V/V), 200 V/µs slew rate, and –120 dBc THD at 1 kHz (1 VRMS), enabling high-fidelity signal conditioning in power-constrained data acquisition systems driving SAR or ΔΣ ADCs.

For engineers reviewing the THS4531AIDR datasheet, THS4531AIDR pinout, THS4531AIDR application, or THS4531AIDR equivalent, key selection criteria include its 250 µA quiescent current, precise VOCM control for DC-coupled ADC interfaces, input common-mode range extending below VS–, and compatibility with 2.5–5.5 V single-supply operation.

Technical Context

The THS4531AIDR implements a fully differential architecture with independent VOCM input for accurate output common-mode voltage setting-critical for seamless interfacing to differential-input ADCs without AC coupling. Its negative rail input allows direct connection to ground-referenced single-ended sources under single-supply operation.

It features a power-down mode (0.5 µA typical) controlled by a dedicated PD pin, and maintains high DC accuracy with ±100 µV input offset voltage and ±3 µV/°C drift over –40°C to +125°C, supporting precision measurement in industrial and portable instrumentation.

Key Specifications

Pinout & Package

THS4531AIDR is packaged in an 8-pin SOIC (D) with body size 4.90 mm × 3.91 mm, optimized for automated assembly and thermal performance in space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with THS4531AIDR, THS4521DR trades ultra-low power for higher speed and lower noise, while THS4532DR offers channel density advantage without sacrificing per-channel specifications-making THS4531AIDR optimal for single-channel, battery-sensitive applications demanding precision and minimal standby current.

Availability

THS4531AIDR is available at Aetrix Electronics and suitable for low-power data acquisition, portable instrumentation, and high-channel-count sensor systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for THS4531AIDR 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 THS4531AIDR belongs to TI's ultra-low-power fully differential amplifier product line, designed specifically for energy-efficient signal conditioning in battery-powered and thermally constrained data acquisition systems interfacing to precision ADCs.

FAQ

What is the supply voltage range supported by the THS4531AIDR?

The THS4531AIDR operates from a single supply of 2.5 V to 5.5 V. This range enables compatibility with common low-voltage rails such as 3.3 V and 5 V, while maintaining full specification compliance-including 36 MHz bandwidth and 250 µA quiescent current-across the entire range. The device is characterized at both 2.7 V and 5 V, with no degradation in key AC or DC performance metrics within the specified operating window.

Does the THS4531AIDR require external components for basic operation?

No, the THS4531AIDR requires no external passive components for fundamental operation. Its VOCM pin allows direct setting of output common-mode voltage without resistive dividers, and the fully differential architecture eliminates the need for output coupling capacitors in DC-coupled ADC interfaces. External feedback resistors (e.g., 2 kΩ) are only needed to configure gain; the device functions at unity gain with no external parts beyond supply decoupling capacitors.

How does the power-down feature of the THS4531AIDR function in practice?

The THS4531AIDR's PD pin enters ultra-low-power mode (0.5 µA typical) when driven logic-low (<0.7 V), disabling the amplifier core while retaining pin state. Turnoff time is 15 ns, and turnon time is 600 ns-enabling rapid activation before ADC sampling windows. The PD pin must be actively driven (not left floating), and its bias current remains below 500 nA, minimizing impact on controlling logic.

Can the THS4531AIDR drive standard 600 Ω differential loads?

Yes, the THS4531AIDR is specified to drive 600 Ω differential loads with full performance. At 5 V supply and G = 1 V/V, it delivers 1 VRMS output into 600 Ω with –120 dBc THD at 1 kHz, and maintains 36 MHz bandwidth. Output saturation voltage is 120/100 mV (high/low), ensuring >4.7 VPP differential swing-well within the 0–5 V output range required for most 600 Ω ADC inputs.

What is the significance of the negative rail input (NRI) specification for the THS4531AIDR?

The negative rail input (NRI) means the THS4531AIDR accepts input voltages down to VS– (typically 0 V in single-supply use), enabling direct connection to ground-referenced sources like microcontroller DAC outputs or sensor bridges without level-shifting circuitry. This simplifies design, reduces component count, and avoids introducing offset or noise from external bias networks-critical for precision, low-power systems where every µA and mV matters.