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Texas Instruments THS4531ID
- Part No.:
- THS4531ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4531ID.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,223
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Product details
Overview
THS4531ID from Texas Instruments is a fully-differential amplifier optimized for low-power, high-precision signal conditioning in data acquisition systems. It delivers 36 MHz bandwidth, 200 V/µs slew rate, –120 dBc THD at 1 kHz (1 VRMS), 10 nV/√Hz input voltage noise, and rail-to-rail output swing with negative rail input capability - enabling direct interface to SAR and ΔΣ ADCs from single 2.5–5.5 V supplies.
For engineers reviewing the THS4531ID datasheet, THS4531ID pinout, THS4531ID application, or THS4531ID equivalent, key selection criteria include ultra-low quiescent current (250 µA), precise VOCM control (±1 mV offset), wide common-mode input range (VS– – 0.2 V to VS+ – 1.2 V), and power-down mode consuming only 0.5 µA - critical for battery-powered and high-channel-density systems.
Technical Context
The THS4531ID implements a fully-differential architecture with independent VOCM input for accurate output common-mode setting, supporting both single-ended-to-differential and differential-to-differential conversion. Its input stage operates below the negative rail (NRI), and its rail-to-rail output enables full dynamic range utilization across 2.5–5.5 V supplies.
It features integrated power-down control (PD pin), delivering 0.5 µA shutdown current with 600 ns turn-on delay. The device maintains DC accuracy over –40°C to +125°C, with ±4 µV/°C VOS drift and 114 dB open-loop gain, ensuring stable performance in industrial and automotive sensor signal chains.
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 systems without dual-rail generation. |
| Quiescent Current | 250 µA per channel - enables >10-year battery life in always-on sensor front-ends and multi-channel DAQ modules. |
| Small-Signal Bandwidth | 36 MHz at G = 1, VS = 5 V - sufficient for driving 16-bit+ SAR ADCs sampling up to 10 MSPS with minimal settling error. |
| THD @ 1 kHz | –120 dBc (1 VRMS, RL = 2 kΩ) - preserves SFDR > 110 dB in audio and precision measurement applications. |
| Input Voltage Noise | 10 nV/√Hz at 1 kHz - ensures <1 µV RMS integrated noise in 10 kHz bandwidth, critical for low-level sensor amplification. |
| VOCM Control Accuracy | ±1 mV common-mode offset - allows dc-coupled ADC interface without level-shifting circuitry or calibration overhead. |
| Power-Down Current | 0.5 µA typical - reduces system standby power by >99.8% versus active mode, essential for duty-cycled IoT nodes. |
Pinout & Package
THS4531ID is packaged in an SOIC-8 (D) package, 4.90 mm × 3.91 mm body size, rated for –40°C to +125°C operation.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VIN– | Inverting input terminal; accepts feedback network connection for closed-loop gain configuration. |
| 2 | VOCM | Output common-mode voltage reference input; sets differential output midpoint independently of signal path. |
| 3 | VS+ | Positive supply rail; must be decoupled locally to minimize PSRR degradation and high-frequency instability. |
| 4 | VOUT+ | Non-inverted differential output; paired with VOUT– to deliver balanced signal to ADC inputs or transmission lines. |
| 5 | VOUT– | Inverted differential output; complements VOUT+ to maintain amplitude and phase symmetry. |
| 6 | VS– | Negative supply rail (typically ground); shared across channels in multi-device layouts per TI design guidance. |
| 7 | PD | Active-high power-down enable; logic high = normal operation, logic low = 0.5 µA shutdown state. |
| 8 | VIN+ | Non-inverting input terminal; accepts single-ended or differential input signals with extended common-mode range. |
Key Features
| Feature | Design Value |
|---|---|
| Fully-differential architecture | Enables rejection of even-order harmonics and common-mode noise in mixed-signal PCB environments. |
| Rail-to-rail output with NRI input | Supports ground-referenced sensors on single supply while maximizing ADC input dynamic range without clamping. |
| Precision VOCM control | ±1 mV offset and 0.996 V/V gain ensure accurate, stable output common-mode alignment to ADC reference midpoints. |
| Ultra-low power consumption | 250 µA quiescent current at 5 V enables 16-channel analog front-end designs within 4 mA total budget. |
| Extended temperature range | Specified from –40°C to +125°C with ±4 µV/°C VOS drift - suitable for under-hood automotive and industrial edge nodes. |
Applications
| Low-Power SAR ADC Driver | Single-Ended to Differential Conversion |
|---|---|
|
Use Scenario: Driving 16-bit, 1 MSPS SAR ADC (e.g., ADS8860) from a microcontroller's single-ended DAC output in a portable gas analyzer. IC Role / Device Role: Signal buffer and level translator that converts unipolar 0–2.5 V DAC output into balanced ±1.25 V differential signal referenced to ADC's internal VCM. Use Value: Eliminates external op-amp level-shifting stages; VOCM pin directly tied to ADC's reference divider output, reducing BOM count and layout area by 30%. |
Use Scenario: Interfacing MEMS microphone (single-ended, 2.5 V supply) to a low-power ΔΣ ADC (e.g., ADS1263) in a battery-powered structural health monitor. IC Role / Device Role: High-fidelity single-ended-to-differential converter with matched gain and phase response across both outputs. Use Value: Achieves –120 dBc THD at 1 kHz and 10 nV/√Hz noise floor, preserving SNR > 105 dB without requiring post-processing correction. |
| High Channel Count Data Acquisition | Low-Power Wide-Bandwidth Signal Conditioning |
|
Use Scenario: 32-channel thermocouple measurement module where each channel requires isolated, low-noise amplification before multiplexing into a shared ADC. IC Role / Device Role: Per-channel differential driver with power-down control synchronized to multiplexer switching. Use Value: 0.5 µA shutdown current per channel reduces idle power by 99.8%, extending system runtime from 8 to >300 hours on a 2000 mAh Li-ion cell. |
Use Scenario: Front-end conditioning for ultrasonic time-of-flight (ToF) sensor in smart water meter, processing 40 kHz burst signals with fast settling. IC Role / Device Role: Wide-bandwidth, low-distortion amplifier with 36 MHz bandwidth and 200 V/µs slew rate for clean pulse fidelity. Use Value: Settles to 0.01% in 150 ns, enabling accurate echo timing resolution <10 ns - critical for ±1 mm distance 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 |
|---|---|---|---|
| THS4521ID | Higher bandwidth (145 MHz), higher IQ (1.14 mA), no rail-to-rail output - limited output swing near rails. | Better suited for high-speed communication interfaces (e.g., LVDS line drivers) but less optimal for low-voltage ADC coupling. | Select THS4521ID only when >100 MHz bandwidth is required and supply headroom permits non-rail-to-rail output swing. |
| THS4551IRGTR | Higher bandwidth (150 MHz), lower THD (–128 dBc), higher IQ (1.37 mA), same VOCM accuracy and NRI support. | Targeted at higher-resolution, higher-sample-rate systems (e.g., 18-bit, 2 MSPS ADCs) where power budget allows ~5× higher quiescent current. | Choose THS4551IRGTR when THD and bandwidth margins are prioritized over battery life - not drop-in compatible due to WQFN-10 vs SOIC-8 footprint. |
Compared with THS4531ID, THS4521ID trades ultra-low power for speed and THS4551IRGTR adds bandwidth and THD performance at 5× higher current draw - making THS4531ID the optimal choice for power-constrained, precision ADC driver applications demanding <250 µA operation and rail-to-rail output.
Availability
THS4531ID is available at Aetrix Electronics and suitable for low-power data acquisition, battery-operated sensor nodes, and high-channel-density industrial I/O modules requiring stable component supply and long-term manufacturability.
Supply support for THS4531ID 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 THS4531ID belongs to TI's ultra-low-power fully-differential amplifier product line, engineered specifically for energy-efficient signal conditioning in high-density, thermally constrained systems such as portable instrumentation and distributed sensor networks.
FAQ
What is the maximum operating temperature range for the THS4531ID?
The THS4531ID is specified for continuous operation from –40°C to +125°C ambient temperature, with full electrical performance guaranteed across this extended industrial range - including VOS drift of ±4 µV/°C and AOL stability to 114 dB at +125°C. This makes THS4531ID suitable for under-hood automotive and factory-floor industrial deployments where thermal resilience is mandatory.
Does the THS4531ID support true rail-to-rail input operation?
No - the THS4531ID features Negative Rail Input (NRI), meaning its input common-mode range extends down to VS– – 0.2 V, but does not reach the positive rail. Its common-mode high limit is VS+ – 1.2 V at 25°C. However, the output is rail-to-rail, swinging within 100 mV of both VS+ and VS–. This asymmetric input range is intentional to support ground-referenced single-ended sources while maintaining high CMRR (>90 dB).
Can the THS4531ID drive a 600 Ω differential load?
Yes - the THS4531ID delivers ±25 mA linear output current per side (at VS = 5 V), enabling direct drive of 600 Ω differential loads (300 Ω per side) with full rail-to-rail swing and <0.1% distortion at 1 kHz. The datasheet explicitly validates THD = –120 dBc at 1 VRMS into RL = 2 kΩ, and output balance error remains –67 dB at 1 MHz into 2 kΩ, confirming robust drive capability well beyond 600 Ω.
How does the VOCM pin function in the THS4531ID?
The VOCM pin in THS4531ID sets the output common-mode voltage with 0.996 V/V gain and ±1 mV offset error. When driven with a stable voltage (e.g., half-supply or ADC reference divider), it forces the average of VOUT+ and VOUT– to match that voltage - enabling precise dc-coupled interfacing to ADCs without AC coupling capacitors or level-shifting resistors. VOCM bandwidth is 24 MHz, supporting fast common-mode transients during multiplexed channel switching.
Is the THS4531ID pin-compatible with other devices in the THS45xx family?
No - the THS4531ID (SOIC-8) has a unique pinout among THS45xx devices. For example, THS4521ID uses the same SOIC-8 package but assigns VOCM to Pin 3 and VS+ to Pin 7, whereas THS4531ID places VOCM on Pin 2 and VS+ on Pin 3. Direct substitution would cause supply shorting or misconfigured VOCM. Always verify pin mapping using TI's official package drawings before board reuse.
THS4531ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 390V/µs
- Gain Bandwidth Product:
- 27 MHz
- -3db Bandwidth:
- 36 MHz
- Current - Input Bias:
- 160 nA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 250µA
- Current - Output / Channel:
- 25 mA
- 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:
- 8-SOIC
THS4531ID FAQ
1.How can I place an order for THS4531ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4531ID 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 THS4531ID reliable?
The price and inventory of THS4531ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4531ID is usually 5 days.
3.What payment methods are accepted for THS4531ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4531ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4531ID?
THS4531ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4531ID 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 THS4531ID?
For technical support, including THS4531ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4531ID requirements.
6.How does Aetrix verify that THS4531ID is sourced from the original manufacturer or authorized distributors?
All THS4531ID 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 THS4531ID meets industry standards.
7.What is the process for return or replacement of THS4531ID?
All THS4531ID units undergo pre-shipment inspection (PSI). If there is an issue with THS4531ID, 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 THS4531ID part is unused and in its original packaging.
Return procedure for THS4531ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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