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Texas Instruments THS4120ID
- Part No.:
- THS4120ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4120ID.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,517
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Product details
Overview
THS4120ID from Texas Instruments is a high-speed fully differential input/output amplifier optimized for single-supply ADC driver 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-referred noise, and features a power-down (PD) pin enabling quiescent current reduction from 11 mA to 120 µA - ideal for portable or power-sensitive data acquisition systems.
For engineers reviewing the THS4120ID datasheet, THS4120ID pinout, THS4120ID application, or THS4120ID equivalent, key selection criteria include its differential-to-differential signal path, VOCM-controlled output common-mode level, PD pin interface requirements (10-kΩ pullup), thermal management via PowerPAD™, and compatibility with 3.3-V single-supply data converter interfaces.
Technical Context
The THS4120ID implements a true fully differential architecture with symmetrical input and output stages, enabling balanced rejection of common-mode noise and cancellation of second-harmonic distortion. Its internal compensation targets maximum bandwidth and slew rate, requiring external series output resistors (>20 Ω) for stable operation into capacitive loads >10 pF.
Operation relies on precise resistor matching (1% or better) in feedback networks to preserve CMRR, PSRR, and harmonic performance. The VOCM pin sets output DC common-mode level - internally biased to VDD/2 when floating - and must be bypassed with a 0.1-µF capacitor for noise immunity and stability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3 dB Bandwidth | 100 MHz - supports wideband signal conditioning up to ~30 MSPS ADC sampling without gain peaking. |
| Slew Rate | 55 V/µs - enables accurate reproduction of fast transient signals (e.g., pulse edges in radar or communications). |
| Total Harmonic Distortion | –75 dB at 1 MHz, 2 VPP - ensures minimal spectral contamination in precision ADC front-ends. |
| Input Voltage Noise | 5.4 nV/√Hz at 10 kHz - low enough to avoid degrading SNR in 12–14-bit ADC systems. |
| Power-Down Current | 120 µA - reduces system standby power by >98% versus active mode (11 mA), critical for battery operation. |
| Supply Voltage Range | 3.0 V to 3.5 V (single supply) - compatible with standard 3.3-V logic and data converter rails. |
| Common-Mode Input Range | 0.35 V to VDD – 0.1 V - accommodates rail-to-rail input signals while maintaining linearity. |
Pinout & Package
THS4120ID is available in SOIC (D), MSOP PowerPAD™ (DGN), and VSSOP (DGK) packages. The DGN package features an exposed thermal pad (PowerPAD™) electrically isolated but thermally coupled to the die - requires soldering to a PCB copper pour for effective heat dissipation and junction temperature control.
| 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 level 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-phase signal relative to VOUT−; drives one leg of differential ADC input. |
| VIN+ | Non-inverting input | Differential input node; symmetry with VIN− essential for balanced operation. |
| PD | Power-down enable | Active-high control: >1.4 V enables, <1.2 V disables; requires 10-kΩ pullup to VDD for default-on operation. |
| GND | Analog ground reference | Low-inductance connection required; separate analog/digital ground planes recommended. |
| VOUT− | Negative differential output | Provides non-inverted-phase signal relative to VOUT+; completes differential output pair. |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Enables 2× dynamic range vs. single-ended amplifiers - e.g., delivers 2 VPP differential output to drive 1 VPP ADC inputs. |
| Integrated power-down pin (PD) | Reduces quiescent current from 11 mA to 120 µA with <5 µs turn-on delay - supports low-power sleep modes in portable instrumentation. |
| VOCM-controlled output level shifting | Allows precise alignment of amplifier output common-mode voltage to ADC reference (e.g., Vref), eliminating level-shifting circuitry. |
| Optimized for 3.3-V single supply | Operates across full industrial temperature range (–40°C to +85°C) without split supplies - simplifies power design in embedded systems. |
| PowerPAD™ thermal enhancement (DGN package) | Reduces θJA to 58.4°C/W - enables sustained 1.71 W power dissipation at 25°C ambient, critical for high-fidelity signal chains. |
Applications
| Differential ADC Driver | Digital Communications Transceiver |
|---|---|
|
Use Scenario: Driving the differential input of a 12-bit, 50-MSPS SAR ADC in a portable medical ultrasound front-end. IC Role / Device Role / Timing Role: Fully differential amplifier converting single-ended sensor signal to balanced 2-VPP output synchronized to ADC clock domain. Use Value: Achieves –75 dB THD and 100-MHz bandwidth to preserve echo signal fidelity while rejecting board-level EMI via common-mode rejection. |
Use Scenario: Transmit path conditioning in a software-defined radio (SDR) baseband module operating at 10–30 MHz IF. IC Role / Device Role / Timing Role: Differential transmitter stage generating low-distortion IQ-modulated waveforms before upconversion. Use Value: 55 V/µs slew rate and –75 dBc third IMD support clean modulation spectra; PD pin enables rapid channel switching with low power overhead. |
| Industrial Data Acquisition | High-Speed Test Equipment |
|
Use Scenario: Signal conditioning for multi-channel 16-bit delta-sigma ADCs in programmable logic controller (PLC) analog input modules. IC Role / Device Role / Timing Role: Precision differential driver with VOCM tied to ADC reference to eliminate offset drift across temperature. Use Value: 25 µV/°C offset drift and 64–96 dB CMRR ensure stable measurement accuracy over –40°C to +85°C industrial environment. |
Use Scenario: Output stage of a 100-MHz arbitrary waveform generator (AWG) used in semiconductor ATE. IC Role / Device Role / Timing Role: High-fidelity differential buffer delivering low-noise, low-distortion waveforms to DUT inputs. Use Value: 5.4 nV/√Hz noise floor and 100-MHz flat bandwidth maintain signal integrity for jitter-sensitive timing measurements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4121ID | No power-down pin; otherwise identical AC/DC specs and pinout. | Lacks PD functionality - unsuitable where dynamic power gating is required. | Select THS4121ID only if continuous operation is guaranteed and PCB layout must avoid PD routing. |
| THS4131ID | Higher 150-MHz bandwidth, 51-V/µs slew rate, lower 1.3-nV/√Hz noise, but wider 5–30-V supply range. | Requires ≥5-V supply; not drop-in compatible with 3.3-V systems. | Choose THS4131ID only when bandwidth/noise demands exceed THS4120ID capabilities and supply voltage allows. |
Compared with THS4120ID, THS4121ID offers identical performance without power-down capability, while THS4131ID trades 3.3-V compatibility for higher speed and lower noise - making THS4120ID the optimal choice for low-voltage, power-aware differential ADC driving.
Availability
THS4120ID is available at Aetrix Electronics and suitable for differential ADC driver, industrial data acquisition, digital communications transceiver, and high-speed test equipment applications requiring stable component supply across extended temperature ranges.
Supply support for THS4120ID 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 innovation in high-speed amplifiers and precision signal chain solutions.
The THS4120ID belongs to TI's high-speed fully differential I/O amplifier family, designed specifically for single-supply, low-distortion ADC driving and differential signal transmission in portable and industrial instrumentation.
FAQ
What is the function of the PD pin on the THS4120ID?
The PD (power-down) pin on the THS4120ID is an active-high enable input that reduces quiescent current from 11 mA to 120 µA when driven below 1.2 V. For reliable default-on operation, TI specifies a 10-kΩ pullup resistor between PD and VDD. The THS4120ID does not enter high-impedance output state during power-down - output impedance remains governed by external feedback network.
Can the THS4120ID operate from a single 3.3-V supply?
Yes, the THS4120ID is explicitly characterized and optimized for single-supply operation at 3.3 V (range: 3.0 V to 3.5 V). Its input common-mode range (0.35 V to VDD – 0.1 V) and VOCM pin functionality allow full-rail signal handling and seamless interfacing with 3.3-V ADC references - no negative supply or level-shifting circuitry is needed.
How should the VOCM pin be configured for optimal performance?
The VOCM pin on the THS4120ID sets the DC common-mode level of both differential outputs. When left unconnected, it defaults to VDD/2. For best noise immunity and stability, TI mandates a 0.1-µF ceramic capacitor placed directly at the VOCM pin to ground. If interfacing with an ADC's Vref output, connect Vref to VOCM through this capacitor - never leave VOCM floating in production designs.
What package options are available for the THS4120ID?
The THS4120ID is offered in three RoHS-compliant packages: SOIC (D, 8-pin), MSOP PowerPAD™ (DGN, 8-pin), and VSSOP (DGK, 8-pin). The DGN variant includes an exposed thermal pad (PowerPAD™) that must be soldered to a PCB copper pour for thermal management - θJA drops to 58.4°C/W, enabling 1.71 W power dissipation at 25°C ambient.
Does the THS4120ID require matched external resistors?
Yes - resistor matching is critical for the THS4120ID. CMRR, PSRR, and second-harmonic distortion cancellation depend on precise ratio matching in the feedback network (Rf/Rg). TI recommends 1% tolerance or better metal-film surface-mount resistors, placed symmetrically near the device, to maintain balanced operation and avoid performance degradation in high-frequency applications.
THS4120ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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-SOIC
THS4120ID FAQ
1.How can I place an order for THS4120ID through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4120ID 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 THS4120ID reliable?
The price and inventory of THS4120ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4120ID is usually 5 days.
3.What payment methods are accepted for THS4120ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4120ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4120ID?
THS4120ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4120ID 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 THS4120ID?
For technical support, including THS4120ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4120ID requirements.
6.How does Aetrix verify that THS4120ID is sourced from the original manufacturer or authorized distributors?
All THS4120ID 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 THS4120ID meets industry standards.
7.What is the process for return or replacement of THS4120ID?
All THS4120ID units undergo pre-shipment inspection (PSI). If there is an issue with THS4120ID, 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 THS4120ID part is unused and in its original packaging.
Return procedure for THS4120ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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