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Texas Instruments THS4121IDGNG4
- Part No.:
- THS4121IDGNG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
THS4121IDGNG4.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,228
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Product details
Overview
THS4121IDGNG4 from Texas Instruments is a single-channel, fully differential-input/differential-output high-speed amplifier optimized for ADC driving and antialiasing filtering in 3.3-V systems. It delivers 100 MHz –3 dB bandwidth, 55 V/µs slew rate, –75 dB THD at 1 MHz (2 VPP), 5.4 nV/√Hz input noise, and operates across –40°C to +85°C with MSOP PowerPAD™ (DGN) package.
For engineers reviewing the THS4121IDGNG4 datasheet, THS4121IDGNG4 pinout, THS4121IDGNG4 application, or THS4121IDGNG4 equivalent, key selection criteria include differential output swing capability, VOCM-controlled common-mode level shifting, low distortion at high frequencies, thermal performance of the DGN PowerPAD™ package, and compatibility with single-supply 3.3-V data converter interfaces.
Technical Context
The THS4121IDGNG4 implements a true fully differential signal path from input to output, enabling balanced rejection of common-mode noise and cancellation of second-harmonic distortion. Its internal architecture supports both differential-input/differential-output and single-ended-input/differential-output configurations without external level-shifting components.
VOCM pin provides precise control over output common-mode voltage-defaulting to VDD/2 in single-supply operation-and maintains high bandwidth up to the amplifier's operating range. The device is internally compensated for maximum bandwidth/slew rate but requires series output resistors (>20 Ω) when driving capacitive loads >10 pF to preserve phase margin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3 dB Bandwidth | 100 MHz - enables baseband signal conditioning up to Nyquist frequency of 50-MSPS ADCs |
| Slew Rate | 55 V/µs - supports fast transient response for high-fidelity pulse and video signal amplification |
| Total Harmonic Distortion | –75 dB at 1 MHz, 2 VPP - ensures minimal spectral contamination in precision data acquisition |
| Input Voltage Noise | 5.4 nV/√Hz at 10 kHz - preserves SNR in low-amplitude sensor or audio front-end stages |
| Supply Voltage Range | 3.3 V single supply - simplifies power architecture and eliminates negative rail in portable/embedded systems |
| Common-Mode Input Range | 0.35 V to VDD – 0.1 V - accommodates rail-to-rail input signals while maintaining linearity |
| Quiescent Current | 13.5 mA typical - balances performance and power efficiency for continuous high-speed operation |
Pinout & Package
The THS4121IDGNG4 is housed in an 8-pin MSOP PowerPAD™ (DGN) package with exposed thermal pad on underside for enhanced heat dissipation. The PowerPAD™ must be soldered to a thermally conductive PCB copper plane to maintain junction temperature ≤125°C under full load.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN− | Inverting input | Differential input node; matched impedance critical for CMRR and harmonic cancellation |
| VOCM | Output common-mode control | Sets DC offset of both outputs; bypass with 0.1 µF capacitor to suppress noise coupling |
| VDD | Positive supply | 3.3-V single supply input; requires local 6.8 µF + 0.1 µF decoupling per TI layout guidelines |
| VOUT+ | Positive differential output | Provides inverted complement of VOUT−; together forms 2-VPP differential swing |
| VIN+ | Non-inverting input | Differential input node; symmetric trace routing required to preserve balance |
| NC | No connect | Unbonded pin; must remain unconnected and unstubbed on PCB |
| GND | Analog ground reference | Low-inductance return path for input/output currents; isolated from digital ground |
| VOUT− | Negative differential output | Provides non-inverted complement of VOUT+; enables transformerless ADC interface |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Enables 2× dynamic range vs. single-ended amps-e.g., drives 2-VPP signal into 1-VPP differential ADC inputs |
| VOCM-controlled output level shifting | Allows precise alignment of differential output common-mode to ADC reference (e.g., VREF) without external resistive dividers |
| High CMRR (96 dB typical) | Maintains signal integrity in noisy industrial environments by rejecting coupled interference on both inputs simultaneously |
| PowerPAD™ thermal enhancement | DGN package delivers 1.71 W power dissipation at 25°C-critical for sustained 100-MHz operation in compact layouts |
| Single-supply 3.3-V operation | Eliminates need for dual supplies in battery-powered or space-constrained applications such as portable test equipment |
Applications
| High-Speed Data Acquisition | Digital Communications Transceiver |
|---|---|
Use Scenario: Driving the differential input of a 12-bit, 50-MSPS SAR ADC in automated test equipment. IC Role / Device Role / Timing Role: ADC driver and antialiasing filter interface with gain = 1 configuration. Use Value: Delivers –75 dB THD at 1 MHz and 100 MHz bandwidth to preserve ENOB across full Nyquist band without transformer coupling. | Use Scenario: Transmitting baseband I/Q signals in software-defined radio front-ends. IC Role / Device Role / Timing Role: Differential transmitter stage converting single-ended DAC outputs to balanced RF mixer inputs. Use Value: Balanced outputs reject common-mode noise induced on PCB traces, improving EVM in 16-QAM modulation schemes. |
| Medical Ultrasound Beamforming | Industrial Sensor Signal Conditioning |
Use Scenario: Amplifying and level-shifting echo return signals from piezoelectric transducers before digitization. IC Role / Device Role / Timing Role: Low-noise, high-linearity analog front-end stage with VOCM set to match ADC reference voltage. Use Value: 5.4 nV/√Hz input noise and –75 dB THD ensure sub-millimeter spatial resolution in time-of-flight measurements. | Use Scenario: Conditioning outputs from bridge-based strain gauges or RTDs in PLC analog input modules. IC Role / Device Role / Timing Role: Differential driver isolating sensitive sensor signals from noisy 24-VDC industrial bus environments. Use Value: 96 dB CMRR rejects common-mode interference from adjacent motor drives or switching power supplies. |
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 | 150 MHz BW, 51 V/µs SR, 1.3 nV/√Hz noise, ±2.5 V to ±15 V supply range | Requires split supply; higher bandwidth/noise performance suits wideband IF sampling, not 3.3-V ADC interfaces | Select when >100 MHz bandwidth and lower noise are prioritized over single-supply simplicity and power efficiency |
| THS4561IRGET | 1.8-GHz GBW, 1300 V/µs SR, 2.3 nV/√Hz noise, rail-to-rail output, 2.7–5.5 V supply | Higher quiescent current (25 mA); optimized for GHz-range RF/IF, not baseband ADC driving | Choose for high-frequency instrumentation or direct RF sampling where THS4121IDGNG4 bandwidth is insufficient |
Compared with THS4131CDGN and THS4561IRGET, the THS4121IDGNG4 offers optimal trade-off of 100-MHz bandwidth, 3.3-V single-supply operation, and 13.5-mA quiescent current-making it uniquely suited for cost- and power-sensitive high-resolution data acquisition where split supplies or GHz bandwidth are unnecessary.
Availability
THS4121IDGNG4 is available at Aetrix Electronics and suitable for high-speed data acquisition, medical ultrasound beamforming, industrial sensor signal conditioning, and digital communications transceiver designs requiring stable component supply across extended temperature ranges.
Supply support for THS4121IDGNG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The THS4121IDGNG4 belongs to TI's high-speed differential I/O amplifier family, designed specifically to replace transformers and discrete op-amp pairs in precision ADC driver and antialiasing filter applications operating from 3.3-V single supplies.
FAQ
What is the function of the VOCM pin on the THS4121IDGNG4?
The VOCM pin on the THS4121IDGNG4 sets the common-mode voltage of both differential outputs. When left unconnected, it defaults to VDD/2 (1.65 V on 3.3-V supply), enabling direct interfacing with ADCs that require mid-supply common-mode bias. For best noise immunity, TI recommends bypassing VOCM to ground with a 0.1-µF ceramic capacitor placed close to the pin. This control allows precise alignment to external references like ADC VREF without external resistor networks.
Does the THS4121IDGNG4 support single-ended input operation?
Yes, the THS4121IDGNG4 supports single-ended-to-differential conversion. With VIN+ grounded and signal applied to VIN− (or vice versa), the device produces complementary differential outputs. TI's datasheet confirms this mode in Figure 26 and specifies THD performance remains –75 dB at 1 MHz under these conditions. Resistor matching between feedback and gain-setting networks is critical to maintain CMRR and minimize second-harmonic distortion in this configuration.
What thermal management is required for the THS4121IDGNG4 in the DGN package?
The THS4121IDGNG4 in the MSOP PowerPAD™ (DGN) package requires soldering its exposed thermal pad to a dedicated PCB copper pour connected to internal or external ground planes. TI specifies θJC = 4.7°C/W and 1.71 W max power dissipation at 25°C ambient-achievable only with proper thermal vias and copper area. Failure to connect the PowerPAD™ risks exceeding the 125°C continuous junction limit, degrading distortion performance and long-term reliability.
Can the THS4121IDGNG4 drive heavy capacitive loads directly?
No, the THS4121IDGNG4 should not drive capacitive loads >10 pF directly due to reduced phase margin causing ringing or oscillation. TI mandates a minimum 20-Ω series resistor between each output and the load (Figure 21). For 50-Ω transmission lines, a 50-Ω series resistor provides both isolation and impedance matching. This requirement applies regardless of load capacitance value-verified in the "Driving a Capacitive Load" section of the SLOS319D datasheet.
How does the THS4121IDGNG4 differ from the THS4120IDGNG4?
The THS4121IDGNG4 lacks the power-down (PD) pin present on the THS4120IDGNG4. While both share identical AC/DC specifications-including 100 MHz bandwidth, 55 V/µs slew rate, and –75 dB THD-the THS4120 adds a PD pin enabling quiescent current reduction from 13.5 mA to 120 µA. The THS4121IDGNG4 is optimized for continuous high-performance operation without power gating, making it preferable in always-on signal chains where PD functionality is unnecessary.
THS4121IDGNG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Bulk
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Differential
- Number of Circuits:
- 1
- Output Type:
- Differential
- Slew Rate:
- 55V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 MHz
- Current - Input Bias:
- 1.2 pA
- Voltage - Input Offset:
- 3 mV
- Current - Supply:
- 11mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 3 V
- Voltage - Supply Span (Max):
- 3.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-HVSSOP
THS4121IDGNG4 FAQ
1.How can I place an order for THS4121IDGNG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4121IDGNG4 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 THS4121IDGNG4 reliable?
The price and inventory of THS4121IDGNG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4121IDGNG4 is usually 5 days.
3.What payment methods are accepted for THS4121IDGNG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4121IDGNG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4121IDGNG4?
THS4121IDGNG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4121IDGNG4 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 THS4121IDGNG4?
For technical support, including THS4121IDGNG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4121IDGNG4 requirements.
6.How does Aetrix verify that THS4121IDGNG4 is sourced from the original manufacturer or authorized distributors?
All THS4121IDGNG4 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 THS4121IDGNG4 meets industry standards.
7.What is the process for return or replacement of THS4121IDGNG4?
All THS4121IDGNG4 units undergo pre-shipment inspection (PSI). If there is an issue with THS4121IDGNG4, 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 THS4121IDGNG4 part is unused and in its original packaging.
Return procedure for THS4121IDGNG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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