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Texas Instruments THS4531AIRUNT
- Part No.:
- THS4531AIRUNT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFQFN
- Datasheet:
-
THS4531AIRUNT.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 10WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,405
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Product details
Overview
THS4531AIRUNT from Texas Instruments is an ultra-low-power, fully differential amplifier with rail-to-rail output and negative-rail input capability, operating from 2.5 V to 5.5 V supply, consuming only 250 µA quiescent current, delivering 36 MHz bandwidth (G = 1), 200 V/µs slew rate, and –129 dBc THD at 1 kHz - optimized for driving low-power SAR and ΔΣ ADCs in battery-powered and high-channel-count data acquisition systems.
For engineers reviewing the THS4531AIRUNT datasheet, THS4531AIRUNT pinout, THS4531AIRUNT application, or THS4531AIRUNT equivalent, this page delivers verified specifications, validated pin functions, real-world signal conditioning use cases, and confirmed alternative options for precision, low-power differential interface design.
Technical Context
The THS4531AIRUNT 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 (VS–), and its rail-to-rail output supports full dynamic range utilization across 2.5–5.5 V supplies.
It features a dedicated power-down pin (PD) that reduces quiescent current to 0.5 µA typical, with 600 ns turn-on and 15 ns turn-off delays. The VOCM input exhibits 24 MHz small-signal bandwidth, 15 V/µs slew rate, and ±1 mV common-mode offset - critical for maintaining accuracy in closed-loop common-mode feedback configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5 V to 5.5 V - enables direct operation from single Li-ion or dual-supply industrial rails without regulation overhead. |
| Quiescent Current | 250 µA - allows integration into always-on sensor nodes and multi-channel systems where thermal and power budget are constrained. |
| Small-Signal Bandwidth | 36 MHz at G = 1 - supports wideband signal conditioning up to ~12-bit ENOB at 10 MSPS sampling rates. |
| Slew Rate | 220/390 V/µs (rise/fall) - ensures faithful reproduction of fast transient signals without slewing-induced distortion. |
| THD @ 1 kHz | –129 dBc - meets high-fidelity requirements for audio-grade and precision measurement front-ends. |
| Input Voltage Noise | 10 nV/√Hz - preserves SNR in low-amplitude sensor signal chains, especially below 10 kHz. |
| Input Offset Voltage | ±100 µV (25°C) - minimizes DC error accumulation in multi-stage amplification or high-gain configurations. |
| Power-Down Current | 0.5 µA typical - extends battery life in intermittent-sampling applications such as portable medical monitors. |
Pinout & Package
THS4531AIRUNT is packaged in a 10-pin WQFN (RUN) with 2.00 mm × 2.00 mm body size and 0.5 mm pitch, optimized for space-constrained PCB layouts in portable instrumentation and modular data loggers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Non-inverting input | Accepts single-ended or differential input signals; supports common-mode down to VS– – 0.2 V. |
| VIN− | Inverting input | Completes fully differential input pair; matched impedance and noise performance with VIN+. |
| VOUT+ | Non-inverted output | Delivers rail-to-rail differential output swing; drives ADC differential inputs directly. |
| VOUT− | Inverted output | Complementary output terminal; maintains balanced drive for optimal CMRR and EMI rejection. |
| VOCM | Output common-mode control | Programs DC output common-mode voltage (0.75–4.0 V range); enables DC coupling to mid-supply-referenced ADCs. |
| PD | Power-down enable | Active-high logic input; asserts low-power mode (<2 µA) when driven ≤0.7 V; requires external pull-up or driver. |
| VS+ | Positive supply | Connects to main positive rail (2.5–5.5 V); decoupling capacitor required within 1 mm of pin. |
| VS− | Negative supply | Ground or negative rail reference; supports true single-supply operation with input extending below VS−. |
| NC | No connection | Pin 1 and Pin 2 are unconnected; must remain floating or grounded per layout guidelines to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low power consumption | 250 µA IQ enables >10-year battery life in 1-kSPS sensor nodes using coin-cell sources. |
| Rail-to-rail output (RRO) | Delivers full-scale differential swing from VS− to VS+, maximizing ADC utilization and dynamic range. |
| Negative-rail input (NRI) | Accepts input signals down to VS− – 0.2 V, eliminating need for input biasing resistors in ground-referenced source interfaces. |
| Precision VOCM control | ±1 mV VOCM offset and 0.996 V/V gain ensure accurate, stable common-mode setting for DC-coupled ADC drivers. |
| Fast power-down recovery | 600 ns turn-on delay allows burst-mode operation without sacrificing throughput in time-multiplexed channel systems. |
Applications
| Low-Power SAR ADC Driver | Single-Ended to Differential Conversion |
|---|---|
Use Scenario: Driving ADS7044 (12-bit, 1-MSPS) in a handheld gas analyzer with 3.3 V supply and 10 µA average system budget. IC Role / Device Role / Timing Role: Fully differential amplifier providing gain, common-mode level translation, and drive strength for ADC's differential input pins. Use Value: Eliminates external level-shifting components; achieves –129 dBc THD at 1 kHz while consuming only 250 µA, preserving battery runtime. | Use Scenario: Converting microphone output (single-ended, ground-referenced) to differential signal for noise-immune transmission over PCB traces to ADC. IC Role / Device Role / Timing Role: Single-ended-to-differential converter with VOCM set to 1.65 V to match ADC mid-supply reference. Use Value: Enables >65 dB output balance error suppression at 1 MHz, reducing EMI susceptibility and improving PSRR by 108 dB. |
| High-Channel-Count Data Acquisition | Low-Power Wide-Bandwidth Signal Conditioning |
Use Scenario: 16-channel thermocouple front-end where each channel uses THS4531AIRUNT to condition µV-level signals before multiplexing into shared ADC. IC Role / Device Role / Timing Role: Low-noise, low-power gain stage with integrated VOCM control for consistent DC-coupled interface across all channels. Use Value: 10 nV/√Hz input noise and ±3 µV/°C VOS drift maintain <0.1% gain error across –40°C to +125°C, enabling calibration-free operation. | Use Scenario: Preconditioning ultrasonic transducer echo signals (200 kHz–2 MHz) in portable ultrasound probe with strict thermal envelope. IC Role / Device Role / Timing Role: Wideband differential driver with 36 MHz bandwidth and 220 V/µs slew rate preserving pulse fidelity. Use Value: Delivers flat frequency response within 0.1 dB up to 15 MHz and settles to 0.1% in 60 ns - critical for time-of-flight accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4531IDGKT | Same silicon die, 8-pin VSSOP package (3.0 × 3.0 mm); higher thermal resistance (198 °C/W vs 163 °C/W). | Preferred for prototyping or legacy board compatibility; less suitable for high-density, thermally constrained layouts. | Select when footprint reuse or hand-soldering is prioritized over thermal performance and miniaturization. |
| THS4521IRGTT | Higher power (1.14 mA IQ), wider bandwidth (145 MHz), lower noise (4.6 nV/√Hz), but no power-down mode and no NRI capability. | Used in high-speed, AC-coupled applications (e.g., communications receivers); not suitable for battery-powered DC-coupled systems. | Choose only when bandwidth/noise outweigh power constraints and DC coupling is unnecessary. |
Compared with THS4531IDGKT and THS4521IRGTT, THS4531AIRUNT uniquely balances ultra-low power (250 µA), rail-to-rail output, negative-rail input, and VOCM control - making it the sole option among these three for compact, battery-operated, DC-coupled ADC driver designs requiring thermal efficiency and precision.
Availability
THS4531AIRUNT 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 manufacturability, and TI-qualified automotive-grade traceability.
Supply support for THS4531AIRUNT 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, fully differential signal conditioning in next-generation portable and high-density data acquisition systems - emphasizing DC accuracy, rail-to-rail operation, and minimal quiescent current without sacrificing bandwidth or THD performance.
FAQ
What is the maximum recommended supply voltage for THS4531AIRUNT?
The absolute maximum supply voltage for THS4531AIRUNT is 5.5 V between VS+ and VS−. Operation above this risks permanent damage. The device is specified for reliable operation from 2.5 V to 5.5 V, with optimal THD and bandwidth achieved at 5 V supply. Always observe the 0.7 V headroom requirement on VOCM input relative to VS+ and VS− rails.
Does THS4531AIRUNT support DC-coupled ADC interfaces?
Yes, THS4531AIRUNT supports true DC-coupled ADC interfaces via its precision VOCM input, which sets output common-mode voltage with ±1 mV offset and 0.996 V/V gain. Combined with negative-rail input (down to VS− – 0.2 V) and rail-to-rail output, it enables direct, level-shift-free connection to mid-supply-referenced ADCs like the ADS7044 or ADS8861 without external bias networks.
What is the function of the PD pin on THS4531AIRUNT?
The PD (power-down) pin on THS4531AIRUNT is an active-high digital control input. When driven ≥2.1 V, the device operates normally (250 µA IQ); when pulled ≤0.7 V, it enters ultra-low-power mode (0.5 µA typical). It must be actively driven - not left floating - and exhibits 600 ns turn-on and 15 ns turn-off delays, supporting burst-mode signal acquisition in energy-constrained systems.
Can THS4531AIRUNT drive a 600-Ω differential load?
Yes, THS4531AIRUNT can drive a 600-Ω differential load (i.e., 300 Ω per side) while maintaining specified performance: at 5 V supply, it delivers ±25 mA linear output current per output, supports 2 VPP differential swing, and exhibits <1% overshoot and 25 ns settling to 1%. For optimal THD, use RF = 2 kΩ feedback and ensure proper PCB layout with symmetric routing and ground plane integrity.
How does THS4531AIRUNT achieve low THD in audio-band applications?
THS4531AIRUNT achieves –129 dBc THD at 1 kHz through a combination of low 10 nV/√Hz input voltage noise, high 114 dB open-loop gain, precise ±100 µV input offset voltage, and symmetrical fully differential architecture that inherently suppresses even-order harmonics. Its 36 MHz bandwidth and 220 V/µs slew rate prevent slew-induced distortion, while VOCM control ensures clean common-mode rejection during large-signal transitions.
THS4531AIRUNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 220V/µs
- Gain Bandwidth Product:
- 27 MHz
- -3db Bandwidth:
- 36 MHz
- Current - Input Bias:
- 200 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 250µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-WQFN (2x2)
THS4531AIRUNT FAQ
1.How can I place an order for THS4531AIRUNT through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4531AIRUNT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for THS4531AIRUNT reliable?
The price and inventory of THS4531AIRUNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4531AIRUNT is usually 5 days.
3.What payment methods are accepted for THS4531AIRUNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4531AIRUNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4531AIRUNT?
THS4531AIRUNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4531AIRUNT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for THS4531AIRUNT?
For technical support, including THS4531AIRUNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4531AIRUNT requirements.
6.How does Aetrix verify that THS4531AIRUNT is sourced from the original manufacturer or authorized distributors?
All THS4531AIRUNT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that THS4531AIRUNT meets industry standards.
7.What is the process for return or replacement of THS4531AIRUNT?
All THS4531AIRUNT units undergo pre-shipment inspection (PSI). If there is an issue with THS4531AIRUNT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The THS4531AIRUNT part is unused and in its original packaging.
Return procedure for THS4531AIRUNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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