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Texas Instruments THS4131IDGK
- Part No.:
- THS4131IDGK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
THS4131IDGK.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:248
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Product details
Overview
THS4131IDGK from Texas Instruments is a fully differential input/output amplifier optimized for high-speed, low-noise signal conditioning in precision analog front-ends. It delivers 170 MHz small-signal bandwidth, 51 V/µs slew rate, –102 dBc THD at 250 kHz (±15 V supply), and 1.25 nV/√Hz input voltage noise - enabling high-fidelity differential ADC driving in medical ultrasound and instrumentation systems.
For engineers reviewing the THS4131IDGK datasheet, THS4131IDGK pinout, THS4131IDGK application, or THS4131IDGK equivalent, this device supports single-ended-to-differential conversion, differential antialiasing filtering, and output level shifting with precise VOCM control - critical for maintaining SNR and dynamic range in ±15 V signal chains.
Technical Context
The THS4131IDGK implements a true fully differential architecture with matched internal gain stages and independent VOCM-controlled common-mode output regulation. Its bipolar process enables rail-to-rail output swing capability (±11.2 V at ±15 V supply) and 95 dB CMRR at 800 kHz, directly supporting noise-immune signal paths in mixed-signal data acquisition.
No power-down pin is integrated - unlike the THS4130 variant - resulting in fixed quiescent current of 13 mA (±15 V) and eliminating external control logic. The device operates across –40°C to +85°C and supports both dual-supply (±2.5 V to ±15 V) and single-supply (5 V to 30 V) configurations without performance degradation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 170 MHz at ±15 V supply - enables baseband signal amplification up to UHF frequencies without gain peaking or phase distortion. |
| Slew rate | 51 V/µs - supports clean reproduction of fast transient signals (e.g., ultrasound pulses) without slewing-induced harmonic distortion. |
| Total harmonic distortion | –102 dBc at 2 VPP, 250 kHz (±15 V) - ensures minimal spectral contamination in high-resolution ADC driver applications. |
| Input voltage noise | 1.25 nV/√Hz at 10 kHz - preserves signal integrity in low-amplitude sensor interfaces such as piezoelectric transducer preamplifiers. |
| Common-mode rejection ratio | 95 dB at 800 kHz - rejects coupled EMI and ground-loop noise in long-cable or noisy industrial environments. |
| Supply voltage range | ±2.5 V to ±15 V dual or 5 V to 30 V single - accommodates legacy ±15 V instrumentation rails and modern low-voltage embedded systems. |
| Operating temperature | –40°C to +85°C - qualified for industrial and medical equipment deployed in uncontrolled ambient conditions. |
Pinout & Package
VSSOP-8 (DGK) package with exposed thermal pad (electrically isolated); 8-pin surface-mount footprint compatible with SOIC-8 layout spacing but 30% smaller area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Differential input (+) | High-impedance, matched input node accepting single-ended or differential source signals; requires symmetric PCB routing for balance. |
| VIN− | Differential input (−) | Complementary input node; differential input resistance is 10 kΩ - sets gain-setting resistor values per Table 9-1 in datasheet. |
| VOCM | Output common-mode control | DC voltage reference input setting output midpoint; floating default = (VCC+ + VCC−)/2; bypass with 0.1 µF capacitor for noise immunity. |
| VOUT+ | Differential output (+) | Active output stage capable of ±11.2 V swing into 1 kΩ load; series 20 Ω resistor required for >10 pF capacitive loads to prevent oscillation. |
| VOUT− | Differential output (−) | Matched complementary output; differential output impedance = [(2 × RF + 2 × RG) || 20 kΩ] - impacts termination and filter design. |
| VCC+ | Positive supply | Accepts up to +15 V; supplies internal bias and output stage; connects to thermal pad via large copper pour for RθJB = 83.2 °C/W. |
| VCC− | Negative supply | Accepts down to –15 V; referenced for PD threshold in THS4130 (not present on THS4131IDGK). |
| NC | No connect | Pin 7 is unconnected - must remain floating; no internal circuitry attached; avoids unintended parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Eliminates need for external baluns or transformer-based conversion - reduces BOM count and board area in ADC interface designs. |
| 1.25 nV/√Hz input voltage noise | Enables detection of sub-millivolt signals from high-impedance sources (e.g., ultrasound transducers) without degrading system SNR. |
| 95 dB CMRR at 800 kHz | Rejects switching noise from nearby DC/DC converters and digital clocks in densely packed mixed-signal PCB layouts. |
| ±11.2 V output swing (±15 V supply) | Maximizes dynamic range into 16-bit+ ADCs without external level-shifting stages - improves effective number of bits (ENOB). |
| VOCM-controlled common-mode output | Allows direct interfacing to ADC reference voltages (e.g., AFE58JD18 TGC VCNTL) without additional op-amp level shifters. |
Applications
| Medical Ultrasound Signal Chain | Differential ADC Driver |
|---|---|
|
Use Scenario: Amplifying weak echo signals from piezoelectric transducers before digitization in portable ultrasound systems. IC Role / Device Role / Timing Role: Fully differential amplifier providing single-ended-to-differential conversion, gain, and VOCM-aligned output for AFE58JD18 time-gain control interface. Use Value: 1.25 nV/√Hz noise floor and –102 dBc THD preserve tissue contrast resolution; ±11.2 V swing matches ADC full-scale range without clipping. |
Use Scenario: Driving high-speed SAR or sigma-delta ADC inputs in test equipment and data loggers. IC Role / Device Role / Timing Role: Precision differential driver with matched output impedance and 170 MHz bandwidth ensuring accurate settling before ADC sampling aperture. Use Value: 39 ns to 0.1% settling time meets timing budgets for ≥1 MSPS sampling; 95 dB CMRR suppresses clock feedthrough artifacts. |
| Single-Ended to Differential Conversion | Differential Antialiasing Filter Interface |
|
Use Scenario: Converting legacy single-ended sensor outputs (e.g., strain gauges, thermocouples) into balanced differential signals for noise-immune transmission. IC Role / Device Role / Timing Role: Gain-stage FDA configured with single-ended input and VOCM-referenced differential output per Figure 8-2. Use Value: Eliminates need for discrete op-amp pairs or transformers; 10 kΩ differential input resistance simplifies RC filter design at input. |
Use Scenario: Buffering and driving passive or active antialiasing filters preceding high-resolution ADCs in spectrum analyzers. IC Role / Device Role / Timing Role: Low-output-impedance driver (41 Ω open-loop) maintaining filter transfer function integrity up to 100 MHz. Use Value: High PSRR (98 dB dc) prevents supply ripple from modulating filter cutoff frequency; 1.7 pA/√Hz current noise avoids resistor thermal noise dominance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4131IDGN | HVSSOP-8 package with exposed thermal pad; RθJB = 30.0 °C/W vs 83.2 °C/W for DGK - enables higher continuous power dissipation. | Better thermal performance required in high-density, convection-cooled ultrasound modules where ambient exceeds 70°C. | Select THS4131IDGN when board-level thermal management is constrained and junction temperature must stay below 125°C under sustained ±15 V operation. |
| THS4561IRGET | Lower noise (0.85 nV/√Hz), wider bandwidth (3200 MHz GBW), but lower output swing (±2.5 V) and no VOCM pin - uses internal common-mode feedback. | Suitable for RF/IF differential signaling (e.g., IQ modulator interfaces), not precision DC-coupled ADC driving. | Choose THS4561IRGET only for AC-coupled, high-frequency (>100 MHz) applications where VOCM control and DC accuracy are not required. |
Compared with THS4131IDGK, THS4131IDGN offers superior thermal handling for high-power density designs, while THS4561IRGET trades DC precision and VOCM flexibility for RF bandwidth - making THS4131IDGK the optimal choice for industrial and medical DC-coupled differential signal chains requiring guaranteed –40°C to +85°C operation and ±11.2 V output swing.
Availability
THS4131IDGK is available at Aetrix Electronics and suitable for medical ultrasound systems, high-resolution data acquisition, and industrial instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for THS4131IDGK 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 over 50 years of innovation in high-performance amplifiers and data converters.
The THS413x product line was designed specifically for precision, high-speed differential signal conditioning - targeting medical imaging, test equipment, and industrial automation where noise, distortion, and thermal stability are critical.
FAQ
What is the maximum supply voltage rating for THS4131IDGK?
The THS4131IDGK has an absolute maximum supply voltage rating of ±15 V (33 V total), with recommended operating range spanning ±2.5 V to ±15 V dual supply or 5 V to 30 V single supply. Exceeding ±15 V risks permanent damage per Absolute Maximum Ratings table in the datasheet. Operation at ±15 V delivers peak small-signal bandwidth (170 MHz) and output swing (±11.2 V), making it ideal for high-dynamic-range applications like ultrasound beamforming.
Does THS4131IDGK include a power-down feature?
No, THS4131IDGK does not include a power-down pin - that functionality is exclusive to the THS4130 variant (e.g., THS4130IDGK). The THS4131IDGK operates continuously with a fixed quiescent current of 13 mA at ±15 V supply and 10.4 mA at ±5 V. This simplifies system design by removing external PD control logic but requires careful thermal management in always-on applications.
How is the output common-mode voltage set on THS4131IDGK?
The VOCM pin on THS4131IDGK accepts an externally applied DC voltage to directly set the output common-mode level. When left floating, it defaults to (VCC+ + VCC−)/2. For optimal noise immunity, TI recommends bypassing VOCM with a 0.1 µF capacitor to ground. This feature enables precise alignment with ADC reference voltages (e.g., AFE58JD18 TGC VCNTL) without additional level-shifting circuitry - a key advantage in medical ultrasound timing-critical signal paths.
What is the recommended feedback resistor configuration for unity-gain operation with THS4131IDGK?
For unity-gain (G = 1 V/V) operation, TI specifies 390 Ω for both RF and RG resistors per Table 9-1 in the datasheet. These values ensure stable closed-loop performance, minimize output balance error (<0.1% with 1% tolerance resistors), and maintain the specified 170 MHz bandwidth and –102 dBc THD. Using mismatched or non-standard values degrades CMRR, PSRR, and harmonic distortion - particularly critical in high-fidelity ADC driver applications.
Can THS4131IDGK drive capacitive loads directly?
THS4131IDGK should not drive capacitive loads >10 pF directly due to potential high-frequency ringing or oscillation caused by reduced phase margin. TI mandates a minimum 20 Ω series resistor at each output (VOUT+ and VOUT−) when driving capacitive loads - as shown in Figure 9-1. This isolation resistor preserves stability while maintaining signal integrity, especially in 50 Ω transmission line interfaces used in test equipment and high-speed data acquisition systems.
THS4131IDGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 52V/µs
- Gain Bandwidth Product:
- 225 MHz
- -3db Bandwidth:
- 150 MHz
- Current - Input Bias:
- 2 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 12.3mA
- Current - Output / Channel:
- 85 mA
- Voltage - Supply Span (Min):
- 4 V
- Voltage - Supply Span (Max):
- 33 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-VSSOP
THS4131IDGK FAQ
1.How can I place an order for THS4131IDGK through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4131IDGK 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 THS4131IDGK reliable?
The price and inventory of THS4131IDGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4131IDGK is usually 5 days.
3.What payment methods are accepted for THS4131IDGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4131IDGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4131IDGK?
THS4131IDGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4131IDGK 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 THS4131IDGK?
For technical support, including THS4131IDGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4131IDGK requirements.
6.How does Aetrix verify that THS4131IDGK is sourced from the original manufacturer or authorized distributors?
All THS4131IDGK 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 THS4131IDGK meets industry standards.
7.What is the process for return or replacement of THS4131IDGK?
All THS4131IDGK units undergo pre-shipment inspection (PSI). If there is an issue with THS4131IDGK, 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 THS4131IDGK part is unused and in its original packaging.
Return procedure for THS4131IDGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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