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Texas Instruments THS4121IDGN
- Part No.:
- THS4121IDGN
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
THS4121IDGN.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,286
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Product details
Overview
THS4121IDGN from Texas Instruments is a single-channel, fully differential-input/differential-output high-speed amplifier optimized for ADC driver and antialiasing filter applications. 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 voltage noise, and operates from a single 3.3 V supply. Its VOCM pin enables precise output common-mode level control in data converter interfaces.
For engineers reviewing the THS4121IDGN datasheet, THS4121IDGN pinout, THS4121IDGN application, or THS4121IDGN equivalent, this page provides verified specifications, package-validated pin functions, real-world use cases in precision analog front-ends, and confirmed alternative options for differential signal conditioning designs requiring low distortion and rail-to-rail output swing.
Technical Context
The THS4121IDGN implements a true fully differential signal path with matched internal gain stages, enabling balanced output signals that inherently reject common-mode noise and suppress second-harmonic distortion. Its architecture supports both differential-input/differential-output and single-ended-input/differential-output configurations without external level-shifting circuitry.
It features a dedicated VOCM pin for setting output common-mode voltage independently of input signal, allowing seamless interfacing with ADC reference outputs (e.g., AVDD/2 or VREF). The device lacks power-down functionality-unlike the THS4120-making it suitable for always-on, low-latency signal chains where quiescent current stability is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3 dB Bandwidth | 100 MHz - supports wideband signal conditioning up to Nyquist zone 1 of 50 MSPS+ ADCs |
| Slew Rate | 55 V/µs - ensures faithful reproduction of fast transient signals without slewing-induced distortion |
| Total Harmonic Distortion | –75 dB at 1 MHz, 2 VPP - meets high-fidelity requirements for 14-bit+ ADC drivers |
| Input Voltage Noise | 5.4 nV/√Hz at 10 kHz - preserves SNR in low-amplitude sensor and audio signal paths |
| Supply Voltage | 3.3 V single supply - simplifies power architecture and matches modern ADC core voltages |
| Common-Mode Input Range | 0.35 V to VDD – 0.1 V - accommodates ground-referenced or mid-rail biased inputs |
| Output Swing (RL = 800 Ω) | VOL = 0.15 V, VOH = 3.15 V - delivers >2.9 VPP differential output with minimal headroom loss |
Pinout & Package
THS4121IDGN uses the thermally enhanced MSOP PowerPAD™ (DGN) package with an exposed thermal pad on the underside for PCB-level heat dissipation. The 8-pin layout supports compact, high-density layouts while maintaining low θJA (58.4°C/W) and high power handling (1.71 W at TA = 25°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN− | Inverting input | Differential input node; requires matched impedance to VIN+ for optimal CMRR |
| VOCM | Output common-mode control | Sets DC level of both outputs; bypass with 0.1 µF capacitor to suppress noise coupling |
| VDD | Positive supply | Single 3.3 V supply input; decouple with 0.1 µF ceramic + 6.8 µF tantalum per TI layout guidelines |
| VOUT+ | Positive differential output | Delivers inverted or non-inverted signal depending on configuration; drives ADC AIN+ or transmission line |
| VIN+ | Non-inverting input | Differential input node; symmetry with VIN− essential for harmonic cancellation |
| NC | No connect | Pin 6 is unconnected internally; must remain floating or grounded per PCB design rules |
| GND | Analog ground reference | Return path for supply and signal currents; tie to low-impedance analog ground plane |
| VOUT− | Negative differential output | Complementary output to VOUT+; enables true differential signaling and common-mode rejection |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Enables 2× dynamic range vs. single-ended amplifiers-e.g., 2 VPP output into 1 VPP ADC differential input |
| Balanced output common-mode rejection | 96 dB CMRR (typ.) minimizes noise coupling from shared supply or ground paths in mixed-signal systems |
| Low-distortion signal path | –75 dB THD at 1 MHz eliminates need for post-amplifier filtering in high-resolution data acquisition |
| VOCM-controlled output level shifting | Allows direct interface to ADC reference outputs (e.g., AVDD/2) without external bias networks |
| PowerPAD™ thermal enhancement | Exposed thermal pad reduces junction-to-board thermal resistance by >80% vs. standard MSOP |
Applications
| High-Speed Data Acquisition | Differential Transceiver Interface |
|---|---|
|
Use Scenario: Driving the differential input of a 14-bit, 100 MSPS pipeline ADC in a medical ultrasound front-end. IC Role / Device Role / Timing Role: ADC driver with antialiasing filter integration, providing gain = 1, 2 VPP output swing, and sub-100 ps settling to 0.01%. Use Value: Eliminates transformer coupling, reduces board area by 40%, and maintains ENOB ≥13.2 bits across 0–45 MHz input band. |
Use Scenario: Transmitting balanced analog video signals over 75 Ω coaxial cable in broadcast equipment. IC Role / Device Role / Timing Role: Differential transmitter with DC-coupled output, VOCM set to 1.65 V for 0–3.3 V swing compliance. Use Value: Achieves >60 dB common-mode noise rejection on long cables and suppresses second-harmonic artifacts visible in HD video waveforms. |
| Single-Supply Sensor Signal Conditioning | Low-Distortion Audio Line Driver |
|
Use Scenario: Amplifying low-level bridge sensor outputs (e.g., load cell, RTD) in industrial process controllers using only 3.3 V supply. IC Role / Device Role / Timing Role: Precision differential amplifier with VOCM referenced to ADC's internal VREF, rejecting supply ripple and EMI. Use Value: Delivers <10 µV offset drift over –40°C to 85°C and –70 dB THD at 10 kHz, meeting Class A sensor accuracy specs. |
Use Scenario: Driving balanced XLR inputs of professional audio ADCs in studio-grade microphone preamplifiers. IC Role / Device Role / Timing Role: Low-noise line driver with 5.4 nV/√Hz input noise and symmetrical ±1 V output swing referenced to VOCM = 1.65 V. Use Value: Preserves 115 dB SNR across 20 Hz–20 kHz and avoids clipping on 24-bit audio peaks due to 2.9 VPP headroom. |
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 to ±15 V split-supply only | Requires dual supply; superior noise performance but incompatible with 3.3 V single-supply systems | Select when higher bandwidth and lower noise justify dual-rail power and layout complexity |
| THS4561IRGET | 800 MHz BW, 2500 V/µs SR, 2.3 nV/√Hz noise, 3.3 V single supply, integrated VOCM buffer | Higher speed and noise performance; includes internal VOCM follower eliminating external op-amp | Choose for >200 MSPS ADC interfaces where THS4121IDGN's 100 MHz BW is limiting |
Compared with THS4121IDGN, THS4131CDGN offers higher bandwidth but mandates split supplies, while THS4561IRGET delivers 8× bandwidth and integrated VOCM buffering at the cost of higher quiescent current (25 mA vs. 13.5 mA) and reduced availability in DGN package.
Availability
THS4121IDGN is available at Aetrix Electronics and suitable for high-speed data acquisition, differential transceiver interfaces, and single-supply sensor signal conditioning requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for THS4121IDGN 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 converter solutions.
The THS412x family was designed specifically for precision differential signal conditioning in ADC driver, antialiasing, and high-fidelity communication applications-emphasizing low distortion, wide bandwidth, and single-supply operation.
FAQ
What is the operating temperature range for THS4121IDGN?
The THS4121IDGN is rated for industrial temperature operation from –40°C to +85°C, as indicated by the "I" suffix in the part number. This range is validated per TI's recommended operating conditions and absolute maximum ratings, ensuring reliable performance in harsh environments such as factory automation and outdoor instrumentation where thermal cycling occurs.
Does THS4121IDGN include a power-down feature?
No, THS4121IDGN does not include a power-down pin or function. Unlike the THS4120, which has a PD pin, the THS4121IDGN is optimized for continuous-operation applications. Its quiescent current remains fixed at 13.5 mA (typ.) under 3.3 V supply, making it unsuitable for battery-powered systems requiring duty-cycled amplification.
How should the VOCM pin be used in THS4121IDGN circuits?
The VOCM pin on THS4121IDGN sets the DC common-mode level of both differential outputs. For ADC interfacing, connect it directly to the ADC's reference output (e.g., AVDD/2 or VREF) via a 0.1 µF ceramic bypass capacitor. Do not leave VOCM floating-TI specifies internal mid-rail bias only if externally unconnected, but performance degrades without proper decoupling.
Can THS4121IDGN drive capacitive loads directly?
THS4121IDGN requires series isolation resistors for capacitive loads >10 pF to maintain stability. TI recommends placing a 20 Ω resistor in series with each output (VOUT+ and VOUT−) when driving cables, ADC input capacitance, or filters. This prevents high-frequency ringing and preserves phase margin, as confirmed in the "Driving a Capacitive Load" section of the SLOS319D datasheet.
What package type is THS4121IDGN supplied in, and how is thermal management handled?
THS4121IDGN uses the MSOP PowerPAD™ (DGN) package with an exposed thermal pad on the underside. To ensure thermal reliability, the pad must be soldered to a copper pour connected to internal ground or power planes. TI specifies θJA = 58.4°C/W and maximum continuous power dissipation of 1.71 W at 25°C ambient-achievable only with proper thermal pad attachment per SLMA002 guidelines.
THS4121IDGN 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:
- Active
- 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
THS4121IDGN FAQ
1.How can I place an order for THS4121IDGN through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4121IDGN 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 THS4121IDGN reliable?
The price and inventory of THS4121IDGN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4121IDGN is usually 5 days.
3.What payment methods are accepted for THS4121IDGN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4121IDGN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4121IDGN?
THS4121IDGN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4121IDGN 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 THS4121IDGN?
For technical support, including THS4121IDGN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4121IDGN requirements.
6.How does Aetrix verify that THS4121IDGN is sourced from the original manufacturer or authorized distributors?
All THS4121IDGN 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 THS4121IDGN meets industry standards.
7.What is the process for return or replacement of THS4121IDGN?
All THS4121IDGN units undergo pre-shipment inspection (PSI). If there is an issue with THS4121IDGN, 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 THS4121IDGN part is unused and in its original packaging.
Return procedure for THS4121IDGN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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