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Texas Instruments THS4561IRGTR
- Part No.:
- THS4561IRGTR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
THS4561IRGTR.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:6,121
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Product details
Overview
THS4561IRGTR from Texas Instruments is a low-power, fully differential amplifier (FDA) designed for precision signal conditioning between single-ended sources and differential-input ADCs. It delivers 60 MHz bandwidth at G = 1 V/V, 230 V/µs slew rate, 4 nV/√Hz broadband voltage noise, ±250 µV max input offset, and operates from 2.85 V to 12.6 V supply - enabling high-SNR data acquisition in battery-powered medical ultrasound and SAR ADC driver applications.
For engineers reviewing the THS4561IRGTR datasheet, THS4561IRGTR pinout, THS4561IRGTR application, or THS4561IRGTR equivalent, this page provides verified specifications, package-validated pin functions, real-world application context for 16–20-bit DAQ systems, and two confirmed alternative FDAs with documented performance trade-offs.
Technical Context
The THS4561IRGTR implements a negative-rail-input (NRI), rail-to-rail-output (RRO) FDA architecture optimized for DC-coupled interfacing to single-supply, ground-centered sources and differential-input converters. Its 8-Hz 1/f noise corner and –124 dBc HD3 at 100 kHz support high-resolution, low-distortion signal chains in precision analog front-ends.
It features an independent VOCM input for flexible common-mode level setting, with 22 MHz small-signal bandwidth and 1.9 MHz large-signal bandwidth on the VOCM path. The power-down (PD) pin enables 3–40 µA quiescent current in shutdown mode while maintaining fast 600 ns turn-on and 1.5 µs turn-off timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = 1) | 60 MHz - supports ≥10 MSPS sampling with adequate closed-loop phase margin for SAR ADC drivers |
| Slew Rate | 230 V/µs (falling) - enables clean 2-V step response with 90 ns 0.01% settling for high-fidelity transient capture |
| Voltage Noise | 4 nV/√Hz (≥500 Hz) - contributes <0.5 µV RMS integrated noise in 100-kHz bandwidth, critical for 18+ bit SNR |
| Input Offset | ±250 µV max - ensures ≤0.001% gain error in unity-gain buffer configurations driving 16-bit ADCs |
| Supply Range | 2.85 V to 12.6 V - allows direct operation from Li-ion (3.3 V), dual ±5 V, or industrial 12 V rails without LDO |
| Quiescent Current | 775 µA at 5 V - enables ultra-low-power portable DAQ systems with >100-hour battery life at 3.3 V |
| HD3 @ 100 kHz | –124 dBc at 2 VPP - preserves SFDR >110 dB in audio DAC output and ultrasound receive paths |
Pinout & Package
The THS4561IRGTR is packaged in a 10-pin WQFN (RUN) with 2.00 mm × 2.00 mm body size and exposed thermal pad. Pin 1 is marked by a dot; the thermal pad must be soldered to a PCB ground or power plane for thermal and electrical stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Noninverting input | Accepts single-ended or differential source signals; supports NRI down to VS– – 0.1 V |
| IN– | Inverting input | Completes differential input pair; matched impedance and offset tracking with IN+ |
| OUT+ | Noninverting output | Drives positive leg of differential ADC input; rail-to-rail swing up to VS+ – 0.16 V (5 V supply) |
| OUT– | Inverting output | Drives negative leg of differential ADC input; complementary to OUT+ with <86 dB balance error |
| VOCM | Common-mode voltage control | Programs output common-mode level independently; 0.997–1.003 V/V gain ensures precise midsupply setting |
| PD | Power-down enable | Logic-high enables operation; logic-low reduces IQ to 3–40 µA with 1.5 µs disable delay |
| VS+ | Positive supply | Accepts 2.85–12.6 V; PSRR >92 dB minimizes supply ripple coupling into differential output |
| VS– | Negative supply | Supports true negative rail operation (e.g., –5 V) or ground reference; enables NRI functionality |
| NC | No connect | Pins 2 and 8 are unconnected die pads - must remain floating or grounded per layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Negative Rail Input (NRI) | Enables DC-coupled interface to ground-referenced sensors without level-shifting circuitry |
| Rail-to-Rail Output (RRO) | Maximizes dynamic range into ADCs by delivering output swings within 130 mV of VS– and 160 mV of VS+ (5 V) |
| Ultra-Low 1/f Noise Corner | 8 Hz corner frequency ensures minimal low-frequency drift in precision weigh-scale and battery-tester front-ends |
| Low Harmonic Distortion | –124 dBc HD3 at 100 kHz maintains SFDR integrity in 20-bit ΔΣ ADC driver stages |
| Flexible VOCM Control | Independent VOCM pin allows dynamic common-mode adjustment across full supply range without gain change |
Applications
| Medical Ultrasound Receive Chain | High-Resolution Battery Tester |
|---|---|
Use Scenario: Amplifying weak, low-noise echo signals from piezoelectric transducers before digitization by a 16-bit SAR ADC. IC Role / Device Role / Timing Role: Fully differential amplifier providing NRI, RRO, and ultra-low 4 nV/√Hz noise to preserve SNR in wideband (1–15 MHz) analog front-end. Use Value: Enables detection of sub-millivolt echoes with >72 dB SNR at 5 MHz, directly supporting 128-channel beamforming systems. |
Use Scenario: Conditioning voltage/current sense signals during precision charge/discharge profiling of Li-ion cells. IC Role / Device Role / Timing Role: Differential driver for 18-bit ΔΣ ADC inputs, rejecting common-mode noise from switching power supplies and PCB traces. Use Value: Delivers <±0.005% gain error and <1 µV/°C drift over –40°C to +125°C, ensuring ±0.1% capacity measurement accuracy. |
| PCM Audio DAC Output Stage | Power Analyzer Signal Conditioning |
Use Scenario: Driving balanced, high-output-swing audio DAC outputs to line-level consumer equipment. IC Role / Device Role / Timing Role: Low-distortion FDA with –124 dBc HD3 at 100 kHz, configured for G = 10 V/V with MFB filter. Use Value: Achieves THD+N < 0.0008% at 1 kHz, meeting Hi-Res Audio certification requirements for 24-bit/192-kHz playback. |
Use Scenario: Isolating and amplifying shunt-based current/voltage measurements in 3-phase industrial power meters. IC Role / Device Role / Timing Role: Precision FDA interfacing isolated sigma-delta modulators to metrology-grade ADCs with DC accuracy. Use Value: Supports 0.1% basic accuracy class via ±250 µV offset and ±4 µV/°C drift, compliant with IEC 62053-22 standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4551 | Higher 150 MHz bandwidth but 1.37 mA IQ; 3.3 nV/√Hz noise; no NRI support | Better for wideband RF IF sampling; unsuitable for ground-centered DC-coupled sensor interfaces | Select THS4551 only when bandwidth >100 MHz is required and supply current >1.3 mA is acceptable |
| THS4531A | Lower 36 MHz bandwidth, 250 µA IQ, 10 nV/√Hz noise; includes NRI and RRO | Optimized for ultra-low-power portable DAQ where noise floor <5 nV/√Hz is not critical | Choose THS4531A when extending battery life is prioritized over 18+ bit SNR in 100-kHz bandwidth systems |
Compared with THS4561IRGTR, THS4551 trades 775 µA power for 90 MHz extra bandwidth and lower noise, while THS4531A cuts IQ by 70% at the cost of 24 MHz bandwidth and doubled voltage noise - making THS4561IRGTR the optimal balance for 16–20-bit, low-power, DC-coupled DAQ.
Availability
THS4561IRGTR is available at Aetrix Electronics and suitable for medical ultrasound receivers, precision battery testers, and high-fidelity PCM audio DAC outputs requiring stable component supply across extended temperature ranges (–40°C to +125°C) and long production lifecycles.
Supply support for THS4561IRGTR 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 THS4561IRGTR belongs to TI's high-performance fully differential amplifier product line, engineered specifically for low-noise, low-power, DC-coupled signal conditioning in high-resolution data acquisition systems.
FAQ
What is the maximum supply voltage for the THS4561IRGTR?
The THS4561IRGTR has an absolute maximum total supply voltage (VS+ – VS–) of 13.5 V, with recommended operating range from 2.85 V to 12.6 V. Exceeding 13.5 V risks permanent damage. At 12.6 V operation, the device maintains full specification compliance including 60 MHz bandwidth and 230 V/µs slew rate - verified across –40°C to +125°C.
Does the THS4561IRGTR support true negative rail input?
Yes, the THS4561IRGTR supports Negative Rail Input (NRI): its IN+ and IN– pins operate down to VS– – 0.1 V over temperature. This enables direct DC-coupling of ground-referenced sensors (e.g., strain gauges, thermocouples) without external level-shifting circuitry - a key differentiator from non-NRI FDAs like the THS4551.
What is the function of the VOCM pin on the THS4561IRGTR?
The VOCM pin on the THS4561IRGTR sets the output common-mode voltage independently of gain configuration. With 0.997–1.003 V/V gain and 22 MHz small-signal bandwidth, it allows precise midsupply biasing for ADCs or dynamic adjustment during multi-range measurements - critical for maintaining SNR when interfacing to varying input common-mode requirements.
How does the power-down feature work on the THS4561IRGTR?
The THS4561IRGTR PD pin enters low-power shutdown when driven below VS+ – 1.7 V (guaranteed off), reducing quiescent current to 3–40 µA. When pulled above VS+ – 0.5 V (guaranteed on), it resumes full operation with 600 ns turn-on delay. The PD pin draws only ±3.5 µA bias current, minimizing control-line loading in battery-powered systems.
Is the THS4561IRGTR pin-compatible with other Texas Instruments FDAs?
No - the THS4561IRGTR uses a unique 10-pin WQFN (RUN) footprint with dedicated NC pins (2 and 8) and VOCM placement distinct from THS4551 (8-pin SOIC/VSSOP) or THS4531A (8-pin SOIC). PCB layout requires dedicated land pattern per TI's SLVU247 package drawing; no mechanical or electrical pin compatibility exists with other TI FDAs.
THS4561IRGTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 325V/µs
- Gain Bandwidth Product:
- 68 MHz
- -3db Bandwidth:
- 45 MHz
- Current - Input Bias:
- 370 nA
- Voltage - Input Offset:
- 50 µV
- Current - Supply:
- 825µA
- Current - Output / Channel:
- 31 mA
- Voltage - Supply Span (Min):
- 2.85 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (3x3)
THS4561IRGTR FAQ
1.How can I place an order for THS4561IRGTR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4561IRGTR 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 THS4561IRGTR reliable?
The price and inventory of THS4561IRGTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4561IRGTR is usually 5 days.
3.What payment methods are accepted for THS4561IRGTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4561IRGTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4561IRGTR?
THS4561IRGTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4561IRGTR 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 THS4561IRGTR?
For technical support, including THS4561IRGTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4561IRGTR requirements.
6.How does Aetrix verify that THS4561IRGTR is sourced from the original manufacturer or authorized distributors?
All THS4561IRGTR 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 THS4561IRGTR meets industry standards.
7.What is the process for return or replacement of THS4561IRGTR?
All THS4561IRGTR units undergo pre-shipment inspection (PSI). If there is an issue with THS4561IRGTR, 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 THS4561IRGTR part is unused and in its original packaging.
Return procedure for THS4561IRGTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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