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Texas Instruments THS4131CDGNRG4
- Part No.:
- THS4131CDGNRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
THS4131CDGNRG4.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,489
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Product details
Overview
THS4131CDGNRG4 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 (±15 V supply), 51 V/µs slew rate, –102 dBc THD at 250 kHz, and 1.25 nV/√Hz input voltage noise - enabling high-fidelity differential ADC driving in medical ultrasound and instrumentation systems.
For engineers reviewing the THS4131CDGNRG4 datasheet, THS4131CDGNRG4 pinout, THS4131CDGNRG4 application, or THS4131CDGNRG4 equivalent, key selection criteria include its ±15 V dual-supply capability, HVSSOP-8 PowerPAD™ thermal performance, VOCM-controlled output common-mode level, and absence of power-down functionality compared to THS4130 variants.
Technical Context
The THS4131CDGNRG4 implements a true fully differential signal path with matched internal gain stages and a dedicated VOCM input that directly sets output common-mode voltage - critical for interfacing with differential-input ADCs requiring precise DC bias alignment. Its complementary bipolar process enables high-voltage operation up to ±15 V while maintaining 95 dB CMRR at 800 kHz and low 1/f noise corner at 350 Hz.
No internal power-down circuitry exists; unlike the THS4130, the THS4131CDGNRG4 lacks a PD pin and operates continuously when powered. The HVSSOP-8 package integrates an electrically isolated thermal pad connected to PCB copper for junction-to-board thermal resistance of 30.0°C/W - essential for sustaining 13 mA quiescent current at full ±15 V supply without thermal derating.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 170 MHz at ±15 V supply - supports wideband signal chains up to ~100 MHz usable baseband without gain peaking or phase margin loss. |
| Slew rate | 51 V/µs - enables clean reproduction of fast transient signals (e.g., ultrasound pulses) without slewing-induced distortion. |
| Total harmonic distortion | –102 dBc at 2 VPP, 250 kHz - ensures minimal spectral contamination in high-dynamic-range data acquisition. |
| Input voltage noise | 1.25 nV/√Hz at 10 kHz - preserves SNR 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 mixed-signal PCB layouts with shared analog/digital returns. |
| Supply voltage range | ±2.5 V to ±15 V dual supply - provides >22 VPP output swing headroom for driving 16-bit+ ADCs without clipping. |
| Quiescent current | 13 mA at ±15 V - balances speed and power in thermally constrained HVSSOP-8 layouts; no shutdown mode reduces control complexity. |
Pinout & Package
HVSSOP-8 (DGN) package with exposed thermal pad - requires soldering pad to large PCB copper area for optimal thermal dissipation (RθJB = 30.0°C/W). Pin 1 = VIN+, Pin 2 = VOCM, Pin 3 = VCC−, Pin 4 = VOUT−, Pin 5 = VIN−, Pin 6 = VOUT+, Pin 7 = VCC+, Pin 8 = NC (no connect).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Differential positive input | Accepts single-ended or differential input; high-impedance node (215 MΩ common-mode RIN) minimizes loading on preceding stage. |
| VOCM | Output common-mode voltage control | DC-bias reference input - sets midpoint of VOUT+ and VOUT−; must be driven by low-impedance source or bypassed with 0.1 µF capacitor. |
| VCC− / VCC+ | Negative / positive supply rails | Support ±2.5 V to ±15 V operation; PSRR of 98 dB (dc) suppresses supply ripple from affecting differential output accuracy. |
| VOUT− / VOUT+ | Differential output terminals | Deliver balanced, inverted/normal outputs; closed-loop differential output impedance ≈ 20 kΩ || (2×RF + 2×RG) - impacts termination and load matching. |
| VIN− | Differential negative input | Complements VIN+; differential input resistance is 10 kΩ - defines gain-setting network interaction per Table 9-1. |
| NC | No-connect terminal | Pin 8 is unconnected die bond wire - must remain floating; not usable as ground or feedback node. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Eliminates need for external baluns or transformer coupling - enables direct interface to differential ADC inputs while rejecting even-order harmonics. |
| VOCM-controlled output bias | Allows precise alignment of differential output DC level to ADC reference mid-point (e.g., AVDD/2), preventing saturation in rail-to-rail converters. |
| High-voltage bipolar process | Supports ±15 V supplies - delivers >22 VPP differential swing into 800 Ω loads, extending dynamic range beyond 5 V-only amplifiers. |
| Low 1/f noise corner | 350 Hz corner frequency - maintains low noise performance down to audio-band frequencies critical in ultrasound time-gain control (TGC) circuits. |
| HVSSOP-8 PowerPAD™ thermal design | 30.0°C/W junction-to-board resistance - sustains full 13 mA ICC at ±15 V without thermal throttling in compact PCB footprints. |
Applications
| Medical Ultrasound Beamforming | 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 converting single-ended transducer output to balanced differential signal aligned to ADC common-mode voltage. Use Value: –102 dBc THD and 1.25 nV/√Hz noise preserve weak-signal integrity across 1–10 MHz imaging bands; VOCM control matches ADC reference for maximum ENOB. |
Use Scenario: Driving high-resolution SAR or pipeline ADCs (e.g., AFE58JD18) in test equipment and data loggers. IC Role / Device Role / Timing Role: High-speed buffer and level shifter ensuring full-scale differential input compliance with minimal settling error. Use Value: 39 ns to 0.1% settling and 170 MHz bandwidth enable accurate sampling of fast transients; ±15 V supply supports >20 VPP input ranges. |
| Single-Ended to Differential Conversion | Differential Antialiasing Filter Interface |
Use Scenario: Converting legacy single-ended sensor outputs (e.g., strain gauges, RTDs) to differential format for noise-immune transmission. IC Role / Device Role / Timing Role: Gain-stage FDA accepting single-ended input at VIN+ while referencing VIN− to VOCM-derived common-mode level. Use Value: 95 dB CMRR at 800 kHz rejects ambient EMI during long cable runs; resistor-matched feedback (Table 9-1) ensures <0.1% amplitude imbalance. |
Use Scenario: Buffering output of active antialiasing filters before feeding differential ADC inputs in spectrum analyzers. IC Role / Device Role / Timing Role: Low-distortion, high-output-drive amplifier isolating filter response from ADC input capacitance. Use Value: 65 mA output current drives 7 Ω loads at ±15 V - maintains filter transfer function integrity despite capacitive ADC input loading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4131CDGN | Same silicon, identical electrical specs; R/G4 suffix denotes tape-and-reel packaging and RoHS-compliant finish. | No functional difference - used interchangeably in production where JEDEC-compliant packaging and Pb-free finish are required. | Select THS4131CDGNRG4 for automated SMT assembly with moisture-sensitive level (MSL) 3 handling and lead-free compliance. |
| THS4131IDGNRG4 | Identical amplifier core but rated for –40°C to +85°C industrial temperature range vs. 0°C to +70°C for THS4131CDGNRG4. | Required for outdoor, automotive under-hood, or industrial motor control environments where ambient exceeds 70°C. | Choose THS4131IDGNRG4 when operating temperature extends beyond commercial range; otherwise THS4131CDGNRG4 suffices. |
Compared with THS4131CDGNRG4, THS4131CDGN offers identical performance in non-RoHS or non-tape-and-reel contexts, while THS4131IDGNRG4 trades commercial temperature grade for extended thermal robustness - both retain the same HVSSOP-8 footprint, VOCM control, and no-power-down architecture.
Availability
THS4131CDGNRG4 is available at Aetrix Electronics and suitable for medical imaging systems, high-resolution data acquisition, industrial test equipment, and ultrasound beamforming requiring stable component supply across extended production cycles.
Supply support for THS4131CDGNRG4 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, embedded processing, and connectivity technologies - with over 50 years of amplifier design heritage and broad portfolio coverage from precision op amps to high-speed FDAs.
The THS413x family was engineered specifically for high-fidelity differential signal conditioning in demanding analog front-ends - targeting medical ultrasound, test instrumentation, and communications infrastructure where noise, distortion, and bandwidth are critical.
FAQ
What is the function of the VOCM pin on the THS4131CDGNRG4?
The VOCM (Voltage Output Common-Mode) pin on the THS4131CDGNRG4 sets the DC midpoint voltage of the differential outputs VOUT+ and VOUT−. When driven by a low-impedance source - such as a DAC reference or resistor divider - it precisely aligns the output common-mode level to match the input requirements of downstream differential ADCs. Leaving VOCM unconnected defaults it to (VCC+ + VCC−)/2, but adding a 0.1 µF bypass capacitor minimizes noise coupling. This feature is essential for maximizing dynamic range in high-resolution data converters.
Does the THS4131CDGNRG4 support power-down functionality?
No, the THS4131CDGNRG4 does not include power-down capability. Unlike the THS4130 variant, which features an active-low PD pin (Pin 7), the THS4131CDGNRG4 has Pin 7 designated as NC (no connect) and operates continuously whenever powered. This simplifies system control logic but means quiescent current remains at 13 mA (±15 V) regardless of signal activity. For battery-powered or intermittent-use applications requiring ultra-low standby current, the THS4130CDGNRG4 would be the appropriate alternative.
What thermal considerations apply to the THS4131CDGNRG4 in HVSSOP-8 package?
The THS4131CDGNRG4 in HVSSOP-8 (DGN) package incorporates an exposed thermal pad that must be soldered to a large PCB copper pour to achieve its specified RθJB of 30.0°C/W. Without this connection, junction temperature can exceed 125°C under full ±15 V/13 mA operation, risking reliability degradation. TI recommends connecting the pad to a solid internal ground plane or dedicated thermal layer using multiple thermal vias - not routing signals underneath - to maintain safe thermal margins in compact, high-density layouts.
How does resistor matching affect THS4131CDGNRG4 performance in differential applications?
Resistor matching in the feedback network directly impacts THS4131CDGNRG4 output balance, CMRR, and harmonic distortion. Mismatch between RG and RF causes amplitude and phase asymmetry between VOUT+ and VOUT−, generating unwanted common-mode content and degrading effective resolution. TI specifies 1% tolerance or better resistors (e.g., 390 Ω for G = 1) in Table 9-1 to maintain <0.1% balance error - critical for preserving –102 dBc THD and 95 dB CMRR at 800 kHz in medical and instrumentation designs.
Can the THS4131CDGNRG4 drive capacitive loads, and what precautions are needed?
Yes, the THS4131CDGNRG4 can drive capacitive loads, but requires external isolation to prevent instability. Due to its internal compensation optimized for bandwidth and slew rate, direct capacitive loading >10 pF induces peaking or oscillation. TI recommends placing a 20 Ω series resistor at each output (VOUT+ and VOUT−) before the load - as shown in Figure 9-1 - to isolate capacitance and restore phase margin. This also provides source-end impedance matching in 50 Ω systems, making it suitable for driving coaxial cables or ADC input filters with significant shunt capacitance.
THS4131CDGNRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-HVSSOP
THS4131CDGNRG4 FAQ
1.How can I place an order for THS4131CDGNRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4131CDGNRG4 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 THS4131CDGNRG4 reliable?
The price and inventory of THS4131CDGNRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4131CDGNRG4 is usually 5 days.
3.What payment methods are accepted for THS4131CDGNRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4131CDGNRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4131CDGNRG4?
THS4131CDGNRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4131CDGNRG4 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 THS4131CDGNRG4?
For technical support, including THS4131CDGNRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4131CDGNRG4 requirements.
6.How does Aetrix verify that THS4131CDGNRG4 is sourced from the original manufacturer or authorized distributors?
All THS4131CDGNRG4 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 THS4131CDGNRG4 meets industry standards.
7.What is the process for return or replacement of THS4131CDGNRG4?
All THS4131CDGNRG4 units undergo pre-shipment inspection (PSI). If there is an issue with THS4131CDGNRG4, 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 THS4131CDGNRG4 part is unused and in its original packaging.
Return procedure for THS4131CDGNRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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