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Texas Instruments THS4531AIRUNR
- Part No.:
- THS4531AIRUNR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFQFN
- Datasheet:
-
THS4531AIRUNR.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 10WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,549
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Product details
Overview
THS4531AIRUNR 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 - used as a low-power SAR/ΔΣ ADC driver in battery-powered data acquisition systems.
For engineers reviewing the THS4531AIRUNR datasheet, THS4531AIRUNR pinout, THS4531AIRUNR application, or THS4531AIRUNR equivalent, key selection considerations include its 10-pin WQFN package, VOCM-controlled common-mode output, power-down mode (0.5 µA), ±100 µV input offset, and compatibility with single-supply 2.5–5 V systems driving precision ADCs.
Technical Context
The THS4531AIRUNR implements a fully differential architecture with independent input common-mode range extending below the negative rail (VS– – 0.2 V) and rail-to-rail output swing, enabling direct DC-coupled interfacing to ground-referenced sources. Its VOCM pin provides precise output common-mode voltage control (±1 mV offset, 0.996 V/V gain), critical for matching ADC input requirements.
It features dual-stage power-down logic with fast turnon (600 ns) and turnoff (15 ns) timing, and maintains high AC performance across temperature: 36 MHz small-signal bandwidth and –138 dBc third-harmonic distortion at 1 kHz remain stable from –40°C to +125°C under 5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.5 V to 5.5 V - supports single-supply operation in portable and industrial 3.3 V/5 V systems without level-shifting. |
| Quiescent Current | 250 µA - enables multi-channel, power-dense signal chains with sub-1 mW per channel dissipation. |
| Small-Signal Bandwidth | 36 MHz at G = 1 - sufficient for driving 1 MSPS+ SAR ADCs and wideband ΔΣ modulators. |
| 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 audio and precision measurement requirements when driving 16–18-bit ADCs. |
| Input Offset Voltage | ±100 µV - minimizes DC error in closed-loop gain stages, reducing calibration burden in sensor front-ends. |
| Power-Down Current | 0.5 µA - allows dynamic channel gating in battery-operated multichannel DAQ without significant leakage penalty. |
| VOCM Accuracy | ±1 mV offset, 0.996 V/V gain - guarantees precise output common-mode alignment to ADC reference midpoints. |
Pinout & Package
THS4531AIRUNR is packaged in a 10-pin WQFN (RUN) measuring 2.00 mm × 2.00 mm with 0.5 mm pitch, optimized for space-constrained PCB layouts and thermal performance (RθJA = 163°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VOUT–) | Inverted differential output | Delivers complementary signal to VOUT+; requires matched trace routing for optimal CMRR and balance. |
| 2 (VOCM) | Output common-mode control input | Directly sets differential output midpoint; must be driven with low-impedance source (<1 kΩ) for stability. |
| 3 (PD) | Power-down enable input | Logic-high (≥2.1 V) enables normal operation; logic-low (≤0.7 V) reduces IQ to 0.5 µA. |
| 4 (VIN+) | Non-inverting input | Accepts single-ended or differential input; supports common-mode range down to VS– – 0.2 V. |
| 5 (VS–) | Negative supply rail | Ground reference for single-supply use; tied to system GND in 2.5–5.5 V applications. |
| 6 (VIN–) | Inverting input | Completes fully differential input pair; same CM range and impedance as VIN+. |
| 7 (VOUT+) | Non-inverted differential output | Primary output leg; paired with VOUT– to drive ADC differential inputs or transmission lines. |
| 8 (NC) | No connection | Internally unconnected; must remain floating or grounded per layout best practices. |
| 9 (VS+) | Positive supply rail | Accepts 2.5–5.5 V; decoupling capacitor (100 nF) required within 2 mm of this pin. |
| 10 (NC) | No connection | Internally unconnected; no external connection required. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Drives within 120 mV of VS+ and 100 mV of VS– at 5 V supply, maximizing dynamic range into ADCs. |
| Negative-rail input (NRI) | Accepts input voltages down to VS– – 0.2 V, enabling true ground-referenced single-ended source interfacing. |
| Output common-mode control (VOCM) | Enables DC-coupled connection to ADCs with fixed or programmable common-mode references (e.g., AVDD/2). |
| Ultra-low-power operation | 250 µA IQ at 5 V allows >100 channels per 100 mA supply rail in high-density data loggers. |
| Fast power-down switching | 15 ns turnoff and 600 ns turnon support time-multiplexed channel architectures with minimal dead time. |
| High DC accuracy | ±100 µV VOS and ±3 µV/°C drift reduce system-level calibration frequency in industrial temperature ranges. |
Applications
| Low-Power SAR ADC Driver | Single-Ended to Differential Conversion |
|---|---|
Use Scenario: Driving ADS8861 (16-bit, 1-MSPS) in a portable environmental sensor node powered by a 3.7 V Li-ion battery. IC Role / Device Role / Timing Role: Fully differential amplifier providing gain, common-mode level shifting, and drive strength for ADC's differential input pins. Use Value: Enables DC-coupled interface with <1 µV RMS noise contribution and <0.001% gain error over temperature, preserving full 16-bit ENOB. | Use Scenario: Converting microphone output (single-ended, ground-referenced) to differential signal for noise-immune routing across a 4-layer PCB to an audio ADC. IC Role / Device Role / Timing Role: Single-ended-to-differential active converter with VOCM set to AVDD/2 for optimal ADC headroom. Use Value: Achieves >85 dB CMRR up to 1 MHz while consuming only 1.25 mW, eliminating need for discrete resistor networks or transformers. |
| Low-Power ΔΣ Modulator Interface | High-Channel-Count Data Acquisition |
Use Scenario: Conditioning analog outputs from 8-channel thermocouple front-end (LTC2000-based) before feeding into a 24-bit ΔΣ ADC (ADS1262). IC Role / Device Role / Timing Role: Precision differential driver with VOCM control matching ADC's internal reference, supporting simultaneous sampling. Use Value: Delivers –138 dBc THD and 114 dB open-loop gain, ensuring <0.1 ppm linearity error in metrology-grade measurements. | Use Scenario: Signal conditioning stage in a 32-channel industrial PLC analog input module with tight thermal and power budgets. IC Role / Device Role / Timing Role: Channel-isolated differential driver with power-down capability synchronized to scan sequence. Use Value: Reduces total module power by 38% vs. standard op-amps via selective channel shutdown, with no performance trade-off in active channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4521DR | Higher power (1.14 mA), 145 MHz BW, lower noise (4.6 nV/√Hz), but no power-down mode. | Better suited for high-speed, AC-coupled applications where ultra-low power is not required. | Select THS4521DR when bandwidth >100 MHz and THD <–120 dBc are prioritized over battery life. |
| ADA4940-1ACPZ-R7 | Lower power (1.2 mA), 1 GHz GBW, higher VOS (±200 µV), no NRI, VOCM range limited to 1.2 V to AVDD–1.2 V. | Preferred for high-frequency RF/IF signal chains requiring >500 MHz small-signal BW. | Choose ADA4940-1 when driving high-speed ADCs (>100 MSPS) and VOCM flexibility is secondary to speed. |
Compared with THS4531AIRUNR, THS4521DR offers significantly higher bandwidth and lower noise but consumes 4.6× more current and lacks power-down; ADA4940-1 provides superior speed but sacrifices negative-rail input and ultra-low-power operation, making THS4531AIRUNR uniquely balanced for precision, low-power, DC-coupled data acquisition.
Availability
THS4531AIRUNR is available at Aetrix Electronics and suitable for low-power data acquisition, portable instrumentation, and high-channel-count industrial sensing requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for THS4531AIRUNR 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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer markets.
The THS4531A product line was developed specifically for ultra-low-power, precision differential signal conditioning in battery-operated and thermally constrained data acquisition systems, emphasizing DC accuracy, rail-to-rail operation, and flexible common-mode control.
FAQ
What is the maximum recommended supply voltage for THS4531AIRUNR?
The absolute maximum supply voltage for THS4531AIRUNR is 5.5 V across VS+ and VS–. The device is specified for reliable operation from 2.5 V to 5.5 V, with optimal AC performance (e.g., 36 MHz bandwidth, –129 dBc THD) confirmed at 5 V. Exceeding 5.5 V risks permanent damage per the Absolute Maximum Ratings table in the SLOS823D datasheet.
Does THS4531AIRUNR support true single-ended input operation?
Yes, THS4531AIRUNR supports true single-ended input operation via its negative-rail input (NRI) feature: VIN+ or VIN– can accept signals referenced to ground (VS–) while the other input is biased at a stable common-mode voltage. This enables direct interface with ground-referenced sensors or DACs without external level-shifting circuitry - a capability confirmed in the device description and Figure 35 of the THS4531A datasheet.
How does the VOCM pin function in THS4531AIRUNR, and what is its input voltage range?
The VOCM pin in THS4531AIRUNR directly controls the output common-mode voltage with 0.996 V/V gain and ±1 mV offset. At 5 V supply, its valid input range is 0.95 V to 4.15 V. Driving VOCM with a precision voltage (e.g., AVDD/2 = 2.5 V) ensures the differential outputs center exactly at that voltage - essential for seamless DC coupling to ADCs like the ADS8861 or ADS1262, as verified in Section 7.6 of the datasheet.
Can THS4531AIRUNR drive a 600 Ω differential load?
Yes, THS4531AIRUNR is characterized to drive 600 Ω differential loads (i.e., 300 Ω per leg), delivering full rail-to-rail swing with <1% distortion at 1 kHz. The datasheet specifies linear output current drive of ±25 mA at 5 V, sufficient for 600 Ω loads (±2.5 V swing requires ~4.2 mA per leg). Performance metrics including bandwidth flatness and THD are validated under RL = 600 Ω conditions in typical application figures.
What is the power-down behavior of THS4531AIRUNR, and how quickly does it recover?
When PD is pulled low (≤0.7 V), THS4531AIRUNR enters power-down mode, reducing quiescent current to 0.5 µA. Output is disabled (high-impedance state), and recovery occurs in 600 ns after PD returns high (≥2.1 V), with VOUT reaching 90% of final value into 200 Ω load. This behavior is measured and guaranteed per Section 7.6 of the THS4531A datasheet, enabling efficient time-multiplexed channel architectures.
THS4531AIRUNR 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)
THS4531AIRUNR FAQ
1.How can I place an order for THS4531AIRUNR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4531AIRUNR 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 THS4531AIRUNR reliable?
The price and inventory of THS4531AIRUNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4531AIRUNR is usually 5 days.
3.What payment methods are accepted for THS4531AIRUNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4531AIRUNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4531AIRUNR?
THS4531AIRUNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4531AIRUNR 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 THS4531AIRUNR?
For technical support, including THS4531AIRUNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4531AIRUNR requirements.
6.How does Aetrix verify that THS4531AIRUNR is sourced from the original manufacturer or authorized distributors?
All THS4531AIRUNR 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 THS4531AIRUNR meets industry standards.
7.What is the process for return or replacement of THS4531AIRUNR?
All THS4531AIRUNR units undergo pre-shipment inspection (PSI). If there is an issue with THS4531AIRUNR, 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 THS4531AIRUNR part is unused and in its original packaging.
Return procedure for THS4531AIRUNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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