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Texas Instruments THS4120IDGK
- Part No.:
- THS4120IDGK
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
THS4120IDGK.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,078
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Product details
Overview
THS4120IDGK from Texas Instruments is a high-speed, fully differential-input/differential-output amplifier optimized for single-supply ADC driving at 3.3 V. It delivers 100 MHz bandwidth, 55 V/µs slew rate, –75 dB THD at 1 MHz (2 VPP), 5.4 nV/√Hz input noise, and features an integrated power-down pin (PD) enabling quiescent current reduction from 11 mA to 120 µA - used in precision data acquisition systems interfacing with 12–16-bit SAR or sigma-delta ADCs.
For engineers reviewing the THS4120IDGK datasheet, THS4120IDGK pinout, THS4120IDGK application, or THS4120IDGK equivalent, this page provides verified specifications, validated MSOP-8 PowerPAD™ package mapping, confirmed differential ADC driver use cases, and two rigorously cross-checked alternative parts with documented functional and supply-voltage differences.
Technical Context
The THS4120IDGK implements a true fully differential signal path from VIN−/VIN+ to VOUT+/VOUT−, enabling balanced output common-mode noise rejection and second-harmonic cancellation. Its VOCM pin sets output common-mode level (defaulting to VDD/2 = 1.65 V on 3.3 V supply) and supports direct connection to ADC reference outputs via 0.1 µF bypass.
Power-down functionality is implemented via the PD pin, requiring an external 10-kΩ pullup to VDD for enable; logic-low assertion disables the amplifier with 4.8 µs turn-on delay and 3 ns turn-off delay. The device operates exclusively on single 3.3 V supply (3.0–3.5 V range) and is not rated for split-supply operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 100 MHz - supports wideband signal conditioning up to Nyquist of ≥50 MSPS ADCs |
| Slew Rate | 55 V/µs - enables clean 2 VPP differential step response with 60 ns settling to 0.1% |
| Total Harmonic Distortion | –75 dB at 1 MHz, 2 VPP - meets SFDR requirements for 14-bit ENOB at medium frequencies |
| Input Voltage Noise | 5.4 nV/√Hz at 10 kHz - low-noise performance critical for high-resolution ADC front-ends |
| Supply Voltage | 3.3 V single supply only - eliminates need for negative rail in portable or low-power systems |
| Power-Down Current | 120 µA - reduces system standby power by >98% versus active 11 mA quiescent draw |
| Common-Mode Input Range | 0.35 V to VDD – 0.1 V (3.2 V max) - accommodates rail-to-rail input signals with 3.3 V supply |
Pinout & Package
The THS4120IDGK is housed in an 8-pin MSOP PowerPAD™ package (DGK), featuring an exposed thermal pad on the underside electrically isolated from all terminals and requiring solder connection to PCB copper for thermal management per TI SLMA002 guidelines.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN− | Inverting input | Differential input node; matched impedance critical for CMRR & 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 | Single 3.3 V supply input; requires local 6.8 µF + 0.1 µF decoupling per layout guidelines |
| VOUT+ | Positive differential output | Delivers 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 distortion performance |
| PD | Power-down enable | Active-high control; requires 10-kΩ pullup to VDD; <1.2 V disables amplifier |
| GND | Analog ground | Reference for all analog circuitry; must be tied to low-impedance ground plane |
| VOUT− | Negative differential output | Delivers non-inverted-phase signal relative to VOUT+; completes differential pair to ADC |
Key Features
| Feature | Design Value |
|---|---|
| Fully differential I/O architecture | Enables 2× dynamic range vs. single-ended amps - e.g., 2 VPP output into 1 VPP differential ADC inputs |
| Integrated power-down pin (PD) | Reduces quiescent current from 11 mA to 120 µA without external switching circuitry |
| VOCM pin with midrail default | Automatically sets output common-mode to VDD/2 (1.65 V) for seamless interface with 3.3 V ADC references |
| Optimized for single 3.3 V supply | Eliminates dual-rail complexity and associated PSRR degradation in portable/data-acquisition systems |
| Low 5.4 nV/√Hz input noise | Preserves SNR in high-resolution ADC applications where front-end noise dominates system ENOB |
Applications
| High-Speed Data Acquisition | Differential ADC Driver |
|---|---|
Use Scenario: Driving 14-bit, 100 MSPS pipeline ADC in medical ultrasound receiver front-end. IC Role / Device Role / Timing Role: Differential signal conditioner converting single-ended LNA output to balanced 2 VPP differential signal synchronized to ADC sampling clock. Use Value: 100 MHz bandwidth and –75 dB THD ensure full utilization of ADC's dynamic range without aliasing or harmonic folding. |
Use Scenario: Interfacing precision SAR ADC (e.g., ADS8860) in battery-powered industrial sensor node. IC Role / Device Role / Timing Role: Single-supply ADC driver providing VOCM-referenced differential output aligned to ADC's internal reference voltage. Use Value: 3.3 V operation and 120 µA power-down current extend battery life during idle intervals between conversions. |
| Active Antialias Filtering | Capacitive Load Interface |
Use Scenario: Embedded oscilloscope digitizer channel with programmable 5–20 MHz antialias filter. IC Role / Device Role / Timing Role: Active filter stage implementing 2nd-order low-pass topology using THS4120IDGK as gain block and integrator. Use Value: High slew rate (55 V/µs) and low distortion preserve transient fidelity while suppressing out-of-band noise before sampling. |
Use Scenario: Driving 50 Ω coaxial cable (≈100 pF load) from FPGA DAC output in test equipment. IC Role / Device Role / Timing Role: Output buffer isolating DAC from cable capacitance using 20 Ω series resistor per output leg. Use Value: Internally compensated design avoids oscillation; 20 Ω isolation maintains stability while preserving 100 MHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4121IDGK | No power-down pin; identical bandwidth, noise, and distortion specs; same 3.3 V supply | Preferred where continuous operation is required and power cycling is unnecessary | Select THS4121IDGK if system-level power sequencing eliminates need for per-amplifier shutdown control |
| THS4131IDGN | Higher 150 MHz bandwidth, 51 V/µs slew rate, 1.3 nV/√Hz noise; supports 5–30 V single or ±2.5–±15 V split supplies | Required for >100 MSPS ADCs or systems needing wider supply flexibility and lower noise floor | Choose THS4131IDGN when upgrading resolution beyond 16-bit or operating outside 3.3 V constraint |
Compared with THS4120IDGK, THS4121IDGK removes power-down capability but matches all AC/DC specs at 3.3 V, while THS4131IDGN extends bandwidth and supply range at higher cost and noise-performance trade-offs - selection depends on whether power gating, frequency headroom, or supply voltage flexibility is the dominant system requirement.
Availability
THS4120IDGK is available at Aetrix Electronics and suitable for high-speed data acquisition, precision ADC interfacing, active antialias filtering, and capacitive-load driving applications requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for THS4120IDGK 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 high-performance signal chain solutions, with over 50 years of innovation in precision amplifiers and data converter interfaces.
The THS4120IDGK belongs to TI's high-speed differential I/O amplifier family, designed specifically for single-supply, low-voltage ADC driver applications demanding wide bandwidth, low distortion, and integrated power management in compact packages.
FAQ
What is the supply voltage range supported by the THS4120IDGK?
The THS4120IDGK operates exclusively on a single 3.3 V supply, with a specified range of 3.0 V to 3.5 V. It is not rated for split-supply operation or voltages outside this window. Operation at 3.3 V ensures optimal performance for bandwidth, distortion, and noise parameters as characterized in the datasheet - deviating from this supply invalidates guaranteed specifications.
How does the PD pin function on the THS4120IDGK?
The PD (power-down) pin on the THS4120IDGK is an active-high enable input requiring a 10-kΩ pullup resistor to VDD for normal operation. Driving PD below 1.2 V disables the amplifier, reducing quiescent current from 11 mA to 120 µA. Turn-on delay is 4.8 µs; turn-off delay is 3 ns. The PD pin does not provide high-impedance output - output loading remains defined by external feedback resistors.
Can the THS4120IDGK drive a 50 Ω transmission line directly?
No, the THS4120IDGK should not drive a 50 Ω load directly. For capacitive or low-impedance loads >10 pF, TI recommends placing a 20 Ω series resistor at each output (VOUT+ and VOUT−) to maintain stability and prevent high-frequency ringing. In 50 Ω systems, this resistor also provides source-end impedance matching while preserving signal integrity up to 100 MHz.
What is the role of the VOCM pin in THS4120IDGK applications?
The VOCM pin on the THS4120IDGK sets the common-mode DC level of both differential outputs. With no external voltage applied, it defaults to VDD/2 (1.65 V on 3.3 V supply), enabling direct interface to ADCs with internal reference outputs. A 0.1 µF bypass capacitor is mandatory to suppress noise coupling through this high-bandwidth node - omitting it degrades THD and SFDR performance.
Is the THS4120IDGK pin-compatible with the THS4121IDGK?
Yes, the THS4120IDGK and THS4121IDGK share identical pinout, package (DGK), and electrical specifications except for the PD pin: THS4120IDGK includes PD at Pin 6, while THS4121IDGK substitutes NC (no connect) at that location. PCB layouts designed for THS4120IDGK can accommodate THS4121IDGK without modification, though power-down functionality will be unavailable.
THS4120IDGK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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-VSSOP
THS4120IDGK FAQ
1.How can I place an order for THS4120IDGK through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4120IDGK 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 THS4120IDGK reliable?
The price and inventory of THS4120IDGK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4120IDGK is usually 5 days.
3.What payment methods are accepted for THS4120IDGK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4120IDGK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4120IDGK?
THS4120IDGK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4120IDGK 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 THS4120IDGK?
For technical support, including THS4120IDGK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4120IDGK requirements.
6.How does Aetrix verify that THS4120IDGK is sourced from the original manufacturer or authorized distributors?
All THS4120IDGK 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 THS4120IDGK meets industry standards.
7.What is the process for return or replacement of THS4120IDGK?
All THS4120IDGK units undergo pre-shipment inspection (PSI). If there is an issue with THS4120IDGK, 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 THS4120IDGK part is unused and in its original packaging.
Return procedure for THS4120IDGK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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