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Texas Instruments THS4561IDGKT
- Part No.:
- THS4561IDGKT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
THS4561IDGKT.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,297
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Product details
Overview
THS4561IDGKT from Texas Instruments is a low-power, fully differential amplifier (FDA) optimized for precision data acquisition interfaces between single-ended sources and high-resolution 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, low-distortion signal conditioning in battery-powered DAQ systems.
For engineers reviewing the THS4561IDGKT datasheet, THS4561IDGKT pinout, THS4561IDGKT application, or THS4561IDGKT equivalent, this page provides verified specifications, validated VSSOP-8 pin mapping, real-world use cases in SAR/ΔΣ ADC drivers and medical ultrasound front-ends, and technically grounded alternative part comparisons - all aligned with TI's SBOS874D production data.
Technical Context
The THS4561IDGKT implements a negative-rail-input (NRI), rail-to-rail-output (RRO) FDA architecture with independent VOCM control, supporting DC-coupled interfacing to ground-centered sources and single-supply differential-input ADCs. Its 8-Hz 1/f noise corner and –124 dBc HD3 at 100 kHz enable high-fidelity signal chain performance in 16–20-bit conversion systems.
It features integrated power-down (PD) logic with 600 ns turn-on delay and 1.5 µs turn-off delay, plus VOCM control bandwidth of 22 MHz (small-signal) and 1.9 MHz (large-signal), allowing dynamic common-mode adjustment without compromising settling or distortion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = 1) | 60 MHz - supports >10 MSPS sampling in closed-loop ADC driver configurations without gain-dependent roll-off. |
| Slew Rate | 230 V/µs (falling) - ensures faithful reproduction of fast transient signals up to ~20 MHz full-power bandwidth. |
| Voltage Noise | 4 nV/√Hz (≥500 Hz) - contributes minimal added noise in precision sensor and audio DAC output stages. |
| Input Offset | ±250 µV max - enables accurate DC-coupled measurement in 18-bit+ SAR/ΔΣ systems without trimming. |
| Supply Range | 2.85 V to 12.6 V - allows operation from single Li-ion (3.3 V) to dual ±5 V rails, simplifying power architecture. |
| Quiescent Current | 775 µA at 5 V - achieves high-speed performance with ultra-low power, critical for portable instrumentation. |
| Harmonic Distortion | HD3 = –124 dBc @ 100 kHz, 2 VPP - preserves SFDR >110 dB in high-resolution DAQ front-ends. |
Pinout & Package
The THS4561IDGKT is packaged in an 8-pin VSSOP (DGK) with 3.00 mm × 3.00 mm body size and exposed thermal pad not connected to die. Pin functions are electrically validated per TI SBOS874D Figure 6-1 and Table 6-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN+ | Noninverting input | Accepts single-ended or differential source; supports NRI down to VS– – 0.1 V. |
| IN− | Inverting input | Completes differential input pair; matched bias current minimizes offset drift. |
| OUT+ | Noninverting output | Rail-to-rail swing (VS– + 0.13 V to VS+ – 0.16 V at 5 V); drives ADC diff-in directly. |
| OUT− | Inverting output | Complementary output; maintains precise amplitude/phase balance for high CMRR. |
| VOCM | Common-mode voltage input | Programs output common-mode level independently; 0.997–1.003 V/V gain ensures accuracy. |
| PD | Power-down control | Logic-high enables; pulls quiescent current to <40 µA when low - ideal for duty-cycled sensing. |
| VS+ | Positive supply | Supports up to 12.6 V; PSRR >92 dB reduces supply noise coupling into signal path. |
| VS− | Negative supply | Accepts ground or negative rail; enables true single-supply operation with NRI capability. |
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 swing within 130 mV of each rail at 5 V. |
| Ultra-Low 1/f Noise Corner | 8 Hz corner frequency preserves low-frequency SNR in ECG, strain gauge, and precision weigh-scale applications. |
| Independent VOCM Control | Allows precise matching of amplifier output common-mode to ADC input requirements across supply variations. |
| Low Power-Down Current | 3–40 µA shutdown current extends battery life in portable test equipment and IoT edge nodes. |
Applications
| 16-bit to 20-bit SAR/ΔΣ ADC Drivers | Differential Active Filters |
|---|---|
Use Scenario: Driving the differential input of high-speed, high-resolution ADCs such as ADS8900B or AD7768 in portable data loggers. IC Role / Device Role / Timing Role: Fully differential amplifier providing gain, level-shifting, and noise-limited signal conditioning before digitization. Use Value: 60 MHz bandwidth and –124 dBc HD3 ensure >110 dB SFDR at 100 kHz, preserving effective resolution in 18-bit systems. | Use Scenario: Implementing second-order MFB Butterworth filters for anti-aliasing or reconstruction in audio and sensor signal paths. IC Role / Device Role / Timing Role: Precision FDA configured as unity-gain or G = 10 buffer with controlled phase response and low distortion. Use Value: 0.01% settling in 90 ns and 230 V/µs slew rate support stable filter response up to 50 kHz cutoff without peaking. |
| High Output Swing PCM Audio DAC Outputs | Medical Ultrasound Receivers |
Use Scenario: Buffering and amplifying differential outputs of high-fidelity audio DACs (e.g., PCM1794) in battery-powered headphone amps. IC Role / Device Role / Timing Role: RRO FDA delivering rail-to-rail swing and low THD into 32-Ω loads via external resistive network. Use Value: –117 dBc HD2 and –124 dBc HD3 at 100 kHz meet THX-certified audio fidelity requirements. | Use Scenario: Conditioning low-amplitude, wideband echo signals from piezoelectric transducers in handheld ultrasound probes. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth FDA in analog beamformer channel, preceding variable-gain amplifier and ADC. Use Value: 4 nV/√Hz noise and 60 MHz bandwidth preserve SNR across 1–15 MHz imaging bands while consuming <800 µA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4551IDGKT | Higher 150 MHz bandwidth but 1.37 mA IQ; 3.3 nV/√Hz noise; no VOCM slew rate spec provided. | Better for wideband RF/IF sampling; less suitable for battery-constrained DAQ due to 77% higher current. | Select THS4551IDGKT only when >100 MHz small-signal BW is required and power budget allows ≥1.3 mA. |
| THS4531AIDGKT | Lower 36 MHz BW, 10 nV/√Hz noise, 250 µA IQ; lacks NRI and VOCM control. | Targeted at cost-sensitive, lower-performance industrial I/O modules where rail-to-rail input isn't needed. | Choose THS4531AIDGKT only for sub-16-bit systems with tight power limits and no DC-coupling requirement. |
Compared with THS4561IDGKT, THS4551IDGKT trades 775 µA for 150 MHz bandwidth and marginally lower noise, while THS4531AIDGKT sacrifices 60 MHz BW and NRI capability to achieve one-third the quiescent current - making THS4561IDGKT the optimal balance for 16–20-bit, battery-aware DAQ designs.
Availability
THS4561IDGKT is available at Aetrix Electronics and suitable for precision data acquisition, medical ultrasound front-ends, and high-fidelity audio DAC output buffering requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for THS4561IDGKT 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 high-performance signal chain solutions.
The THS4561IDGKT belongs to TI's precision fully differential amplifier product line, engineered specifically for low-power, high-SFDR interfacing between sensors, DACs, and high-resolution ADCs in portable and industrial measurement systems.
FAQ
What is the maximum supply voltage for THS4561IDGKT?
The absolute maximum total supply voltage (VS+ – VS−) for THS4561IDGKT is 13.5 V, but the recommended operating range is 2.85 V to 12.6 V per TI SBOS874D Section 7.3. Operating beyond 12.6 V risks parametric degradation or reliability impact, even if below absolute maximum ratings.
Does THS4561IDGKT support true single-supply operation with ground-referenced inputs?
Yes. THS4561IDGKT features Negative Rail Input (NRI), allowing its IN+ and IN− pins to operate down to VS− – 0.1 V. With VS− = 0 V (ground), it accepts input signals extending to –0.1 V, enabling direct DC-coupled connection to ground-centered sources like bridge sensors or op-amp outputs.
What is the VOCM control bandwidth of THS4561IDGKT, and why does it matter?
THS4561IDGKT offers 22 MHz small-signal VOCM bandwidth (10 mVPP) and 1.9 MHz large-signal bandwidth (1 VPP). This matters because fast VOCM settling ensures accurate common-mode alignment during dynamic gain switching or multiplexed channel scanning - critical for multi-channel DAQ systems using shared ADC references.
Can THS4561IDGKT drive 50-Ω transmission lines directly?
No. THS4561IDGKT has a typical closed-loop output impedance of 0.06 Ω (differential), but its output stage is not designed for continuous 50-Ω load driving. For 50-Ω interface, use external series termination (e.g., 45 Ω per leg) or add a dedicated line driver; direct 50-Ω loading risks thermal stress and distortion increase beyond datasheet specs.
How does THS4561IDGKT compare to THS4561IDRGT in thermal performance?
THS4561IDGKT (VSSOP-8) has RθJA = 183.1°C/W, while THS4561IDRGT (16-pin VQFN) achieves 55.9°C/W due to its exposed thermal pad and larger copper area. For thermally constrained PCBs or continuous 12-V operation, the RGT package reduces junction temperature rise by >69% under identical conditions - a critical factor in sealed medical or industrial enclosures.
THS4561IDGKT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential, Rail-to-Rail
- Slew Rate:
- 315V/µs
- Gain Bandwidth Product:
- 68 MHz
- -3db Bandwidth:
- 60 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:
- 8-VSSOP
THS4561IDGKT FAQ
1.How can I place an order for THS4561IDGKT through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4561IDGKT 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 THS4561IDGKT reliable?
The price and inventory of THS4561IDGKT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4561IDGKT is usually 5 days.
3.What payment methods are accepted for THS4561IDGKT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4561IDGKT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4561IDGKT?
THS4561IDGKT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4561IDGKT 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 THS4561IDGKT?
For technical support, including THS4561IDGKT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4561IDGKT requirements.
6.How does Aetrix verify that THS4561IDGKT is sourced from the original manufacturer or authorized distributors?
All THS4561IDGKT 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 THS4561IDGKT meets industry standards.
7.What is the process for return or replacement of THS4561IDGKT?
All THS4561IDGKT units undergo pre-shipment inspection (PSI). If there is an issue with THS4561IDGKT, 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 THS4561IDGKT part is unused and in its original packaging.
Return procedure for THS4561IDGKT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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