Texas Instruments THS4531AIDGKR

Overview

THS4531AIDGKR 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 THS4531AIDGKR datasheet, THS4531AIDGKR pinout, THS4531AIDGKR application, or THS4531AIDGKR 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 V to 5.5 V single-supply operation.

Technical Context

The THS4531AIDGKR implements a fully differential architecture with independent input and output common-mode control paths. Its negative-rail input (NRI) enables direct interfacing with ground-referenced single-ended sources, while VOCM input allows accurate setting of output common-mode voltage-critical for seamless DC coupling to precision ADCs without level-shifting circuitry.

It features a low-noise, high-speed transconductance stage followed by a rail-to-rail output buffer, optimized for wide-bandwidth differential signal conditioning. Power-down mode reduces supply current to 0.5 µA, supporting dynamic power management in multi-channel, space- and thermal-constrained systems.

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 THS4531AIDGKR, THS4521DR trades 4.5× higher quiescent current for 4× bandwidth and 2× lower noise, while THS4532RGTT offers channel pairing at the cost of independent power control-making THS4531AIDGKR uniquely optimal for scalable, ultra-low-power, single-channel ADC interface designs.

Availability

THS4531AIDGKR is available at Aetrix Electronics and suitable for low-power data acquisition, portable instrumentation, and high-channel-count sensor interface applications requiring stable component supply and long-term manufacturability.

Supply support for THS4531AIDGKR 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 precision amplifiers and data converter interface solutions.

The THS4531A product line was designed specifically for ultra-low-power, DC-coupled differential signal conditioning in next-generation data acquisition systems-emphasizing rail-to-rail operation, negative-rail input, and precise VOCM control.

FAQ

What is the maximum recommended supply voltage for THS4531AIDGKR?

The absolute maximum supply voltage (VS+ to VS–) for THS4531AIDGKR is 5.5 V. Operation beyond this risks permanent damage. The device is specified for reliable operation from 2.5 V to 5.5 V, with optimal performance observed at 2.7 V and 5 V per the Electrical Characteristics tables. Always observe the recommended operating conditions in Section 7.3 of the THS4531AIDGKR datasheet.

Does THS4531AIDGKR support true single-supply operation with ground-referenced inputs?

Yes. THS4531AIDGKR features Negative Rail Input (NRI), allowing its input common-mode range to extend to VS– – 0.2 V. When VS– = 0 V (ground), this enables direct connection of 0 V–referenced sources like resistive sensors or single-ended op-amp outputs-without external level-shifting circuitry. This capability is confirmed in Section 7.5 INPUT specifications.

How does the VOCM pin function in THS4531AIDGKR, and what is its accuracy?

The VOCM pin in THS4531AIDGKR sets the output common-mode voltage with 0.996 V/V gain and ±1 mV offset (typical). When driven with a stable reference (e.g., mid-supply or ADC reference), it ensures precise DC alignment of the differential outputs-enabling direct DC coupling to SAR or ΔΣ ADCs. VOCM input impedance is 65 kΩ || 0.86 pF at 5 V supply, per Section 7.6.

What is the power-down behavior of THS4531AIDGKR, and how fast does it respond?

When the PD pin is pulled low (<0.7 V), THS4531AIDGKR enters power-down mode, reducing quiescent current to 0.5 µA (typical). Turnoff occurs within 15 ns (RL = 200 Ω), and turnon delay is 600 ns to reach 90% of final output. The PD pin must be actively driven-floating is not allowed-as specified in Section 7.6 POWER DOWN.

Can THS4531AIDGKR drive a 600 Ω differential load while maintaining rail-to-rail output swing?

Yes. THS4531AIDGKR delivers rail-to-rail output swing into 600 Ω differential loads, with saturation voltages of 120 mV (high) and 100 mV (low) at 5 V supply (Section 7.6 OUTPUT). At 1 VRMS output (2.83 VPP), this provides >95% of full-scale swing-sufficient for driving most precision ADC inputs such as the ADS8861 or ADS7945 without attenuation.