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Texas Instruments THS4131IDGKR
- Part No.:
- THS4131IDGKR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
THS4131IDGKR.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,405
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Product details
Overview
THS4131IDGKR from Texas Instruments is a fully differential amplifier (FDA) designed for high-speed, low-noise signal conditioning in precision analog front-ends. It delivers 170 MHz small-signal bandwidth, 51 V/µs slew rate, and –102 dBc THD at 250 kHz with ±15 V supplies, serving as a differential ADC driver or single-ended-to-differential converter in ultrasound and data acquisition systems.
For engineers reviewing the THS4131IDGKR datasheet, THS4131IDGKR pinout, THS4131IDGKR application, or THS4131IDGKR equivalent, key selection criteria include its 1.25 nV/√Hz input voltage noise, ±15 V dual-supply operation, 95 dB CMRR at 800 kHz, VOCM-controlled output common-mode level, and VSSOP-8 package thermal performance with RθJA = 147.3°C/W.
Technical Context
The THS4131IDGKR implements a true fully differential signal path from input to output using TI's high-voltage complementary bipolar process, enabling excellent common-mode noise rejection and even-order harmonic suppression. Its architecture includes matched internal output buffers and a dedicated VOCM input that directly sets the output common-mode voltage without affecting differential gain.
No power-down functionality is integrated - unlike the THS4130 variant, the THS4131IDGKR lacks a PD pin and operates continuously when powered. The device supports both differential and single-ended input configurations via external resistor networks, with recommended 1% tolerance feedback resistors to maintain output balance and preserve CMRR/PSRR performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 170 MHz at ±15 V supply - enables accurate amplification of signals up to ~100 MHz in gain = 1 configuration. |
| Slew rate | 51 V/µs - supports fast transient response for high-fidelity pulse and video signal conditioning. |
| Input voltage noise | 1.25 nV/√Hz at 10 kHz - critical for preserving SNR in low-amplitude sensor and medical ultrasound signal chains. |
| Total harmonic distortion | –102 dBc at 2 VPP, 250 kHz, ±15 V - ensures minimal spectral contamination in high-resolution ADC driving applications. |
| Common-mode rejection ratio | 95 dB at 800 kHz - rejects coupled noise in noisy industrial or mixed-signal PCB environments. |
| Supply voltage range | ±2.5 V to ±15 V (dual) or 5 V to 30 V (single) - accommodates wide dynamic range requirements without external level-shifting. |
| Operating temperature | –40°C to +85°C - qualified for industrial and medical equipment deployed in uncontrolled ambient conditions. |
Pinout & Package
VSSOP-8 (DGK) package: 8-pin very thin shrink small-outline package with exposed thermal pad on underside (electrically isolated); requires PCB copper pour connection for optimal thermal dissipation (RθJB = 83.2°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Differential input (non-inverting) | Accepts positive phase of differential input signal; high-impedance node (215 MΩ common-mode, 10 kΩ differential). |
| VIN− | Differential input (inverting) | Accepts negative phase of differential input signal; matched to VIN+ for balanced common-mode rejection. |
| VOCM | Common-mode output control | DC voltage applied here sets output common-mode level; bypass with 0.1 µF capacitor to minimize noise coupling. |
| VOUT+ | Differential output (positive) | Delivers amplified positive-phase output; open-loop output resistance is 41 Ω. |
| VOUT− | Differential output (negative) | Delivers amplified negative-phase output; complements VOUT+ to form fully differential output pair. |
| VCC+ | Positive supply rail | Accepts up to +15 V; powers internal bias circuitry and output stage; PSRR = 98 dB (dc). |
| VCC− | Negative supply rail | Accepts down to –15 V; symmetrical with VCC+ for true bipolar operation and maximum output swing. |
| NC | No-connect terminal | Pin 7 is unconnected internally; must be left floating or tied to ground per layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Enables single-ended-to-differential conversion without external baluns or transformers, reducing board area and EMI susceptibility. |
| VOCM-controlled output common-mode | Allows precise alignment of FDA output DC level to ADC reference mid-point, eliminating need for external level-shifting circuitry. |
| High supply voltage capability (±15 V) | Supports >22 VPP differential output swing into 1 kΩ load, enabling direct interface with high-voltage SAR and sigma-delta ADCs. |
| Low 1/f noise corner (350 Hz) | Minimizes low-frequency drift and flicker noise in precision instrumentation and time-domain medical imaging applications. |
| 95 dB CMRR at 800 kHz | Maintains signal integrity in presence of high-frequency switching noise from DC/DC converters or digital processors sharing same PCB. |
Applications
| Ultrasound Signal Conditioning | Differential ADC Driver |
|---|---|
Use Scenario: Amplifying low-amplitude echo return signals from piezoelectric transducers in portable and cart-based ultrasound systems. IC Role / Device Role / Timing Role: Fully differential amplifier providing single-ended-to-differential conversion, gain, and common-mode level shifting before digitization. Use Value: 1.25 nV/√Hz input noise and –102 dBc THD preserve weak signal fidelity across 1–15 MHz bandwidth, directly improving image contrast resolution. |
Use Scenario: Driving high-speed, high-resolution differential-input ADCs such as ADS58J86 or AFE58JD18 in data acquisition systems. IC Role / Device Role / Timing Role: Precision differential line driver with VOCM control ensuring optimal ADC input common-mode compliance. Use Value: 170 MHz bandwidth and 51 V/µs slew rate support >10 MSPS sampling without settling error, while 95 dB CMRR suppresses digital coupling noise. |
| Antialiasing Filter Interface | Industrial Sensor Signal Chain |
Use Scenario: Buffering and level-shifting outputs of passive or active antialiasing filters prior to differential ADC input. IC Role / Device Role / Timing Role: High-Z input buffer and matched differential driver maintaining filter transfer function integrity. Use Value: 215 MHz gain-bandwidth product allows stable unity-gain operation with minimal phase shift, preserving filter cutoff accuracy. |
Use Scenario: Conditioning low-level outputs from strain gauges, RTDs, or current-sense amplifiers in PLC and motor control modules. IC Role / Device Role / Timing Role: Low-drift, low-noise differential transmitter isolating sensitive analog sensors from noisy digital domains. Use Value: –40°C to +85°C operation and 2 µV/°C offset drift ensure long-term calibration stability in factory-floor environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4561IRGET | Lower noise (0.85 nV/√Hz), lower power (12.5 mA ICC), but reduced bandwidth (950 MHz GBW vs 215 MHz) and no ±15 V operation (max ±5.5 V). | Better suited for low-power, high-precision DC-coupled applications; not viable for high-voltage ultrasound or industrial signal chains requiring >10 VPP swing. | Select THS4561IRGET only when supply headroom is limited and ultra-low noise dominates over output voltage range. |
| LMH5401RTVT | Higher bandwidth (1.8 GHz), higher slew rate (6500 V/µs), but significantly higher noise (2.3 nV/√Hz) and fixed gain (10 V/V) with no VOCM control. | Optimized for RF/IF signal paths and high-speed communications; lacks flexibility for variable-gain, VOCM-adjustable ADC interfaces. | Choose LMH5401RTVT only for fixed-gain, wideband AC-coupled applications where common-mode control is unnecessary. |
Compared with THS4131IDGKR, THS4561IRGET trades high-voltage operation and robustness for lower noise and power, while LMH5401RTVT sacrifices noise performance and configurability for extreme bandwidth - making THS4131IDGKR the optimal choice for industrial and medical systems demanding balanced noise, swing, and flexibility.
Availability
THS4131IDGKR is available at Aetrix Electronics and suitable for ultrasound imaging systems, high-resolution data acquisition, industrial sensor interfaces, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for THS4131IDGKR 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 specializing in analog and embedded processing technologies, with leadership in high-performance signal chain and power management solutions.
The THS413x family was engineered specifically for high-fidelity differential signal conditioning in medical ultrasound, test equipment, and industrial data acquisition - emphasizing low noise, high CMRR, and flexible common-mode control.
FAQ
What is the supply voltage range supported by the THS4131IDGKR?
The THS4131IDGKR supports dual-supply operation from ±2.5 V to ±15 V and single-supply operation from 5 V to 30 V. At ±15 V, it achieves full 170 MHz bandwidth and ±11.5 V output swing into 1 kΩ, making it suitable for high-dynamic-range analog signal chains where headroom is critical - a capability not shared by most competing FDAs rated only up to ±5.5 V.
Does the THS4131IDGKR include a power-down feature?
No, the THS4131IDGKR does not include a power-down pin. Unlike the THS4130 variant, which features an active-low PD pin (pin 7), the THS4131IDGKR has NC (no connect) at pin 7 and operates continuously when powered. This simplifies design in always-on systems but eliminates standby current reduction - quiescent current remains at 13 mA (±15 V) across temperature.
How does the VOCM pin function in the THS4131IDGKR?
The VOCM pin on the THS4131IDGKR directly sets the DC common-mode voltage of both VOUT+ and VOUT− outputs. Applying a stable voltage (e.g., VREF/2) from a low-impedance source aligns the differential output midpoint precisely to the ADC's required common-mode input level. Leaving VOCM floating defaults to (VCC+ + VCC−)/2, but a 0.1 µF bypass capacitor is mandatory to suppress noise coupling into this high-gain control node.
What package type is used for the THS4131IDGKR, and why does it matter?
The THS4131IDGKR uses the DGK package: an 8-pin VSSOP with an electrically isolated thermal pad on the underside. This package delivers RθJA = 147.3°C/W and RθJB = 83.2°C/W - significantly better than SOIC-8 - enabling reliable operation at full 13 mA quiescent current in compact industrial layouts. The thermal pad must be soldered to a large PCB copper plane to prevent junction temperature exceedance.
Can the THS4131IDGKR drive capacitive loads, and how should it be configured?
Yes, the THS4131IDGKR can drive capacitive loads, but requires a series isolation resistor (≥20 Ω) at each output to maintain stability. Internal compensation optimizes bandwidth and slew rate, making the amplifier prone to ringing with >10 pF direct loading. Adding 20–50 Ω resistors between VOUT+ / VOUT− and the load restores phase margin - a requirement confirmed in TI's Figure 9-1 and validated across all operating conditions in the datasheet.
THS4131IDGKR 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
- 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
THS4131IDGKR FAQ
1.How can I place an order for THS4131IDGKR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4131IDGKR 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 THS4131IDGKR reliable?
The price and inventory of THS4131IDGKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4131IDGKR is usually 5 days.
3.What payment methods are accepted for THS4131IDGKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4131IDGKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4131IDGKR?
THS4131IDGKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4131IDGKR 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 THS4131IDGKR?
For technical support, including THS4131IDGKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4131IDGKR requirements.
6.How does Aetrix verify that THS4131IDGKR is sourced from the original manufacturer or authorized distributors?
All THS4131IDGKR 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 THS4131IDGKR meets industry standards.
7.What is the process for return or replacement of THS4131IDGKR?
All THS4131IDGKR units undergo pre-shipment inspection (PSI). If there is an issue with THS4131IDGKR, 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 THS4131IDGKR part is unused and in its original packaging.
Return procedure for THS4131IDGKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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