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Texas Instruments THS4131CDG4
- Part No.:
- THS4131CDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4131CDG4.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,093
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Product details
Overview
THS4131CDG4 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, and –102 dBc THD at 250 kHz with ±15 V supplies, serving as a differential ADC driver or single-ended-to-differential converter in medical ultrasound and data acquisition systems.
For engineers reviewing the THS4131CDG4 datasheet, THS4131CDG4 pinout, THS4131CDG4 application, or THS4131CDG4 equivalent, key selection criteria include its 1.25 nV/√Hz input voltage noise, 95 dB CMRR at 800 kHz, ±15 V supply capability, 8-pin VSSOP package with exposed thermal pad, and absence of power-down functionality compared to THS4130 variants.
Technical Context
The THS4131CDG4 implements a true fully differential signal path from input to output using TI's high-voltage complementary bipolar process, enabling high common-mode noise rejection and suppression of even-order harmonics. Its VOCM pin directly sets output common-mode voltage, and internal 10-kΩ resistors at each output interact with external feedback networks to define closed-loop gain and differential output impedance.
No power-down pin is present-unlike the THS4130-so quiescent current remains fixed at 13 mA (±15 V) or 10.4 mA (±5 V). The device operates across –40°C to +85°C and supports both single-supply (5–30 V) and dual-supply (±2.5 V to ±15 V) configurations, with input common-mode range extending from –3.77 V to +4.3 V under ±5 V rails.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 170 MHz at ±15 V, G = 1 - enables wideband signal chain design up to ~100 MHz usable baseband. |
| Slew rate | 51 V/µs - supports fast transient response for high-fidelity pulse and video applications. |
| Total harmonic distortion | –102 dBc at 2 VPP, 250 kHz, ±15 V - ensures minimal spectral contamination in precision ADC driving. |
| Input voltage noise | 1.25 nV/√Hz at 10 kHz - critical for maintaining SNR in low-amplitude sensor signal amplification. |
| Common-mode rejection ratio | 95 dB at 800 kHz - provides robust immunity to PCB-coupled noise in mixed-signal environments. |
| Supply voltage range | ±2.5 V to ±15 V dual or 5–30 V single - accommodates legacy industrial rails and modern low-voltage systems. |
| Quiescent current | 13 mA at ±15 V - defines thermal load and power budget in continuous-operation high-performance stages. |
Pinout & Package
The THS4131CDG4 is housed in an 8-pin VSSOP (DGK) package with exposed thermal pad on the underside, requiring connection to a large copper plane for optimal thermal performance. Pin 1 is VIN+, pin 2 is VOCM, pin 3 is VCC−, pin 4 is VOUT−, pin 5 is VIN−, pin 6 is VOUT+, pin 7 is NC, and pin 8 is VCC+. The thermal pad is electrically isolated and may be connected to any potential for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN+ | Differential positive input | Accepts one polarity of fully differential or single-ended input signals; referenced to VOCM for common-mode control. |
| VOCM | Output common-mode voltage control | DC bias point setter for differential outputs; must be driven by low-impedance source or bypassed with 0.1 µF capacitor. |
| VCC− | Negative supply rail | Supports dual-supply operation down to –15 V; also used as reference for PD threshold in THS4130 (not applicable here). |
| VOUT− | Negative differential output | Complementary output terminal; forms differential pair with VOUT+; requires matched external feedback network. |
| VIN− | Differential negative input | Completes fully differential input path; imbalance between VIN+ and VIN− degrades CMRR and HD2 performance. |
| VOUT+ | Positive differential output | Primary output terminal; amplitude and phase must mirror VOUT− within <0.1% resistor matching for optimal balance. |
| NC | No connect | Pin 7 is unconnected internally; must remain floating or tied to ground only if required by PCB layout constraints. |
| VCC+ | Positive supply rail | Supports dual-supply operation up to +15 V or single-supply up to +30 V; powers internal bias and output stages. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Enables single-ended-to-differential conversion without external baluns, reducing component count and board area in ADC interface designs. |
| 95 dB CMRR at 800 kHz | Rejects coupled noise from digital sections or switching supplies, preserving signal integrity in dense mixed-signal PCB layouts. |
| 1.25 nV/√Hz input voltage noise | Minimizes added noise floor when amplifying low-level transducer or sensor outputs, especially critical in ultrasound beamforming. |
| ±15 V supply capability | Provides >22 VPP differential output swing into 800 Ω, supporting high dynamic range in industrial and medical instrumentation. |
| VOCM-controlled output bias | Allows precise alignment of differential output DC level to ADC input requirements, eliminating need for AC coupling or level-shifting circuitry. |
Applications
| Ultrasound Beamforming | Differential ADC Interface |
|---|---|
|
Use Scenario: Amplifying weak RF echo signals from piezoelectric transducers before digitization in portable and diagnostic ultrasound systems. IC Role / Device Role / Timing Role: Fully differential amplifier providing gain, common-mode level shifting, and noise rejection in analog front-end channel modules. Use Value: 170 MHz bandwidth and –102 dBc THD preserve time-domain fidelity and spectral purity required for accurate Doppler and B-mode imaging. |
Use Scenario: Driving high-resolution SAR or pipeline ADCs (e.g., ADS8860, AFE58JD18) in test equipment and data loggers. IC Role / Device Role / Timing Role: Differential transmitter converting single-ended DAC outputs or sensor signals into balanced inputs for ADC sampling. Use Value: 95 dB CMRR and 1.25 nV/√Hz noise ensure >16-bit ENOB is maintained across full input frequency range. |
| Antialiasing Filter Driver | High-Voltage Signal Level Shifter |
|
Use Scenario: Buffering and amplifying output of active antialiasing filters prior to differential ADC input in communication receivers and spectrum analyzers. IC Role / Device Role / Timing Role: High-speed, low-distortion gain stage preserving filter group delay and stopband rejection while driving capacitive ADC inputs. Use Value: 51 V/µs slew rate prevents slewing-induced distortion during fast filter transients; 100 MHz small-signal BW supports >40 MHz cutoff filters. |
Use Scenario: Translating logic-level or low-voltage analog signals to higher-voltage differential domains for transmission over noisy industrial buses or long cables. IC Role / Device Role / Timing Role: Output level shifter generating symmetrical ±10 V differential signals from 3.3 V or 5 V microcontroller outputs. Use Value: ±15 V supply support and 22 VPP differential swing enable robust signaling in PLC I/O modules and motor control feedback paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4131IDGK | Same electrical specs but rated for –40°C to +85°C industrial temperature range vs. THS4131CDG4's 0°C to +70°C commercial grade. | Suitable for extended-temperature embedded systems where ambient exceeds 70°C, such as outdoor instrumentation or automotive ECUs. | Select THS4131IDGK when operating environment exceeds 70°C; otherwise THS4131CDG4 meets standard lab and industrial bench requirements. |
| THS4561IRGET | Lower 1.05 nV/√Hz noise, 2.4 GHz GBW, but only ±5.5 V max supply and no VOCM pin-uses internal common-mode feedback. | Better for RF/IF signal chains up to 500 MHz; unsuitable for ±15 V high-voltage ADC drivers or VOCM-programmable level shifting. | Choose THS4561IRGET for GHz-range communications; retain THS4131CDG4 for high-voltage, VOCM-flexible, medical-grade analog front-ends. |
Compared with THS4131IDGK, THS4131CDG4 offers lower cost and sufficient temperature margin for controlled environments, while THS4561IRGET trades supply voltage headroom and VOCM control for ultra-low noise and RF bandwidth-making THS4131CDG4 the optimal choice for precision, high-dynamic-range, ±15 V differential signal conditioning.
Availability
THS4131CDG4 is available at Aetrix Electronics and suitable for medical ultrasound systems, high-resolution data acquisition, industrial process monitoring, and test equipment requiring stable component supply with guaranteed long-term sourcing.
Supply support for THS4131CDG4 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 amplifiers and data converters.
The THS413x family was designed specifically for precision differential signal conditioning in demanding applications like medical imaging and high-speed data acquisition, emphasizing low distortion, wide bandwidth, and robust common-mode rejection.
FAQ
What is the function of the VOCM pin on the THS4131CDG4?
The VOCM pin on the THS4131CDG4 sets the DC common-mode voltage of the differential outputs. When driven by a low-impedance source, it precisely defines the midpoint voltage between VOUT+ and VOUT−. If left unconnected, VOCM defaults to mid-rail (VCC+ + VCC−)/2. A 0.1-µF bypass capacitor is recommended to minimize noise coupling. This feature eliminates external level-shifting components when interfacing with ADCs requiring specific input common-mode ranges.
Does the THS4131CDG4 have a power-down pin?
No, the THS4131CDG4 does not include a power-down (PD) pin. Unlike the THS4130 variant, which features an active-low PD input, the THS4131CDG4 operates continuously with fixed quiescent current-10.4 mA at ±5 V and 13 mA at ±15 V. This simplifies biasing in always-on signal chains but precludes dynamic power gating. Designers requiring shutdown capability must select THS4130CDG4 or alternate solutions.
What package type is used for the THS4131CDG4 and how should the thermal pad be handled?
The THS4131CDG4 uses the 8-pin VSSOP (DGK) package with an exposed thermal pad on the underside. Though electrically isolated from the die, this pad must be soldered to a large copper pour for effective heat dissipation. Failure to do so risks exceeding the 125°C maximum junction temperature during continuous operation at ±15 V. Thermal vias to inner ground planes are strongly recommended to maintain reliability in high-power-density layouts.
How does resistor matching affect THS4131CDG4 performance?
Resistor matching in the external feedback network directly impacts THS4131CDG4 output balance, CMRR, PSRR, and second-harmonic distortion. Mismatch >0.1% introduces measurable common-mode error and degrades HD2 by >10 dB. TI recommends 1% or better tolerance metal-film resistors (e.g., 390 Ω for G = 1) and symmetrical PCB layout. Poor matching also reduces effective SFDR and compromises ADC ENOB in precision measurement applications.
Can the THS4131CDG4 drive capacitive loads, and if so, what precautions are needed?
Yes, the THS4131CDG4 can drive capacitive loads, but series isolation resistors are required for loads >10 pF to maintain stability. A 20 Ω resistor placed in series with each output (VOUT+ and VOUT−) suppresses high-frequency ringing and oscillation caused by reduced phase margin. In 50 Ω systems, 50 Ω series resistors provide both isolation and source termination. Avoid direct connection of >10 pF capacitance to outputs without this compensation.
THS4131CDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
THS4131CDG4 FAQ
1.How can I place an order for THS4131CDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4131CDG4 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 THS4131CDG4 reliable?
The price and inventory of THS4131CDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4131CDG4 is usually 5 days.
3.What payment methods are accepted for THS4131CDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4131CDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4131CDG4?
THS4131CDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4131CDG4 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 THS4131CDG4?
For technical support, including THS4131CDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4131CDG4 requirements.
6.How does Aetrix verify that THS4131CDG4 is sourced from the original manufacturer or authorized distributors?
All THS4131CDG4 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 THS4131CDG4 meets industry standards.
7.What is the process for return or replacement of THS4131CDG4?
All THS4131CDG4 units undergo pre-shipment inspection (PSI). If there is an issue with THS4131CDG4, 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 THS4131CDG4 part is unused and in its original packaging.
Return procedure for THS4131CDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
THS4131CDG4 Tags
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