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Texas Instruments THS4120IDR
- Part No.:
- THS4120IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS4120IDR.pdf
- Description:
- IC OPAMP DIFF 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,388
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Product details
Overview
THS4120IDR 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 voltage noise, and features an integrated power-down pin (PD) enabling quiescent current reduction from 11 mA to 120 µA. It operates from a 3.3 V single supply and supports differential signal conditioning in precision data acquisition systems.
For engineers reviewing the THS4120IDR datasheet, THS4120IDR pinout, THS4120IDR application, or THS4120IDR equivalent, key selection considerations include its power-down functionality, VOCM-controlled output common-mode level, balanced differential drive capability into 800 Ω loads, and compatibility with 12–16-bit SAR and sigma-delta ADCs requiring low distortion and wide bandwidth.
Technical Context
The THS4120IDR implements a true fully differential signal path-differential input to differential output-with symmetrical internal architecture that enables inherent second-harmonic cancellation and >96 dB CMRR over DC–100 kHz. Its VOCM pin sets the output common-mode voltage independently of the differential signal, allowing precise alignment with ADC reference midpoints.
Unlike conventional op-amps, the THS4120IDR's power-down mode disables bias circuitry while maintaining passive feedback network continuity; output impedance remains dominated by external Rf and Rg, not device output stages. The PD pin requires a 10-kΩ pullup to VDD for reliable enablement and exhibits 1.4 V enable threshold and 1.2 V disable threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (–3 dB) | 100 MHz - supports baseband signal conditioning up to Nyquist frequency of ≥50 MSPS ADCs |
| Slew Rate | 55 V/µs - enables clean 2 VPP differential step response with ≤60 ns 0.1% settling |
| THD @ 1 MHz | –75 dB (2 VPP) - meets SNR requirements for 14-bit+ ADC drivers without post-filtering |
| Input Voltage Noise | 5.4 nV/√Hz @ 10 kHz - contributes <0.5 LSB noise floor in 16-bit, 100 kSPS systems |
| Supply Voltage | 3.3 V single supply - eliminates need for dual rails in portable or low-voltage industrial DAQ |
| Power-Down Current | 120 µA - reduces system standby power by >98% vs active mode (11 mA) |
| Common-Mode Input Range | 0.35 V to VDD – 0.1 V - accommodates rail-to-rail input signals when VOCM = VDD/2 |
| Output Drive | ±100 mA sink/source - drives 800 Ω differential loads with <1% gain error and minimal distortion |
Pinout & Package
The THS4120IDR is packaged in an 8-pin SOIC (D) package with exposed thermal pad (PowerPAD™), rated for –40°C to +85°C operation. Thermal pad must be soldered to PCB copper pour for junction temperature control below 125°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN− | Inverting input | Differential input node; matched impedance critical for CMRR & harmonic cancellation |
| VOCM | Output common-mode control | DC bias setting point for both outputs; bypass with 0.1 µF capacitor to suppress noise coupling |
| VDD | Positive supply | 3.3 V single supply input; requires local 0.1 µF ceramic + 6.8 µF tantalum decoupling |
| VOUT+ | Positive differential output | Delivers inverted replica of VIN− relative to VOCM; balanced with VOUT− for noise rejection |
| VIN+ | Non-inverting input | Differential input node; symmetry with VIN− essential for PSRR and distortion performance |
| PD | Power-down enable | Active-high digital control; 10-kΩ pullup required; transitions in <5 µs to full operational state |
| GND | Analog ground reference | Low-inductance connection point for feedback resistors and bypass capacitors |
| VOUT− | Negative differential output | Delivers inverted replica of VIN+ relative to VOCM; complements VOUT+ for full differential swing |
Key Features
| Feature | Design Value |
|---|---|
| Single-ended to differential conversion | Enables transformerless interface between single-ended sensors and differential-input ADCs |
| Integrated VOCM control | Eliminates external level-shifting circuitry; allows direct connection to ADC reference outputs |
| Power-down functionality | Reduces system idle power without requiring PCB-level enable/disable logic redesign |
| Balanced differential outputs | Rejects >64 dB common-mode noise on PCB traces and improves EMI immunity |
| Submicron CMOS process | Ensures stable AC performance across –40°C to +85°C with <25 µV/°C offset drift |
| Thermally enhanced PowerPAD™ | Enables 1.02 W power dissipation at 25°C ambient in SOIC-D package via PCB copper thermal plane |
Applications
| High-Speed Data Acquisition Systems | Portable Medical Instrumentation |
|---|---|
Use Scenario: Driving 14-bit, 100 MSPS pipeline ADCs in ultrasound front-ends where analog bandwidth exceeds 40 MHz. IC Role / Device Role / Timing Role: Differential ADC driver providing gain = 1, VOCM = AVDD/2 alignment, and antialias filtering interface. Use Value: Achieves –75 dB THD at 1 MHz and 100 MHz bandwidth, enabling >80 dB SFDR without external reconstruction filters. | Use Scenario: Signal conditioning for battery-powered ECG monitors requiring low power and high CMRR against 50/60 Hz interference. IC Role / Device Role / Timing Role: Single-supply differential transmitter converting single-ended electrode signals to balanced outputs for isolated ADC inputs. Use Value: Power-down mode cuts quiescent current to 120 µA during sleep cycles, extending battery life by >3× vs continuous operation. |
| Industrial Process Control Sensors | Communications Baseband Conditioning |
Use Scenario: Amplifying low-level bridge sensor outputs (e.g., pressure transducers) in PLC analog input modules. IC Role / Device Role / Timing Role: Precision differential input amplifier with VOCM-adjustable output common-mode for ratiometric ADC interfacing. Use Value: 66 dB minimum open-loop gain and <9 mV max input offset ensure <0.1% FSR error across –40°C to +85°C operating range. | Use Scenario: Baseband I/Q signal conditioning in LTE femtocell receivers prior to quadrature demodulation. IC Role / Device Role / Timing Role: Differential line driver matching 50 Ω transmission lines while suppressing even-order distortion in complex waveforms. Use Value: Balanced outputs reject coupled RF noise; –75 dBc third IMD at 10 MHz enables >70 dB ACLR without calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fully differential amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS4121IDR | No power-down pin; 11 mA fixed quiescent current; identical AC specs (BW, THD, noise) | Preferred where continuous operation is required and board space prohibits pullup resistor routing | Select THS4121IDR only if power-down functionality is unnecessary and layout simplicity is prioritized |
| THS4131IDR | Higher 150 MHz BW, 51 V/µs slew rate, 1.3 nV/√Hz noise; wider 5–30 V supply range | Suitable for higher-resolution (>16-bit) or higher-speed (>100 MSPS) ADC interfaces requiring lower noise floor | Choose THS4131IDR when system demands >10 dB improved SNR or operation beyond 3.3 V supply constraints |
Compared with THS4121IDR, THS4120IDR adds power management at minor cost in layout complexity; compared with THS4131IDR, it trades bandwidth and noise performance for lower supply voltage compliance and reduced quiescent power-making THS4120IDR optimal for cost-sensitive, battery-aware 12–14-bit DAQ systems.
Availability
THS4120IDR is available at Aetrix Electronics and suitable for high-speed data acquisition systems, portable medical instrumentation, and industrial sensor signal conditioning requiring stable component supply across extended temperature ranges.
Supply support for THS4120IDR 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-speed amplifiers and precision signal chain solutions.
The THS4120IDR belongs to TI's high-speed differential I/O amplifier product line, engineered specifically for single-supply ADC driver applications demanding low distortion, wide bandwidth, and power-efficient operation in compact industrial and medical systems.
FAQ
What is the function of the PD pin on the THS4120IDR?
The PD (power-down) pin on the THS4120IDR is an active-high digital control input that reduces quiescent current from 11 mA to 120 µA when driven low. A 10-kΩ pullup resistor to VDD is mandatory for reliable enablement. The THS4120IDR enters power-down mode when PD voltage falls below 1.2 V and resumes full operation above 1.4 V, with turn-on delay of 4.8 µs. This feature is unique to THS4120IDR within the THS412x family.
Can the THS4120IDR operate from a 5 V supply?
No, the THS4120IDR is specified only for 3.3 V single-supply operation per its recommended operating conditions and absolute maximum ratings (VDD ≤ 3.6 V). Attempting 5 V operation risks permanent damage. For 5 V systems, consider TI's THS4131IDR or THS4141IDR-both rated for 5–30 V supplies and offering compatible differential I/O functionality.
How does the VOCM pin affect THS4120IDR output behavior?
The VOCM pin on the THS4120IDR sets the DC common-mode voltage of both differential outputs (VOUT+ and VOUT−). When left unconnected, VOCM defaults internally to VDD/2 (1.65 V at 3.3 V supply). Applying an external voltage to VOCM shifts the entire differential output swing around that DC level-enabling direct matching to ADC reference voltages. A 0.1 µF bypass capacitor is required on VOCM to prevent noise injection.
What is the minimum load impedance the THS4120IDR can drive reliably?
The THS4120IDR is characterized for 800 Ω differential loads (400 Ω per output) in its electrical specifications. While it can source/sink ±100 mA, driving loads below 200 Ω differential (100 Ω per side) risks gain nonlinearity and increased distortion. For capacitive loads >10 pF, a 20 Ω series resistor per output is required to maintain stability-per TI's application note SLOS319D.
Is the THS4120IDR pin-compatible with the THS4121IDR?
Yes, the THS4120IDR and THS4121IDR share identical 8-pin SOIC (D) package footprints and pin assignments-including VIN−, VOCM, VDD, VOUT+, VIN+, GND, VOUT−, and NC (THS4121) vs PD (THS4120). However, the THS4121IDR has no power-down function; its Pin 6 is No Connect, whereas THS4120IDR Pin 6 is the PD control input. PCBs designed for THS4120IDR require a pullup resistor on Pin 6 to operate correctly.
THS4120IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
THS4120IDR FAQ
1.How can I place an order for THS4120IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for THS4120IDR 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 THS4120IDR reliable?
The price and inventory of THS4120IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS4120IDR is usually 5 days.
3.What payment methods are accepted for THS4120IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS4120IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS4120IDR?
THS4120IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS4120IDR 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 THS4120IDR?
For technical support, including THS4120IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS4120IDR requirements.
6.How does Aetrix verify that THS4120IDR is sourced from the original manufacturer or authorized distributors?
All THS4120IDR 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 THS4120IDR meets industry standards.
7.What is the process for return or replacement of THS4120IDR?
All THS4120IDR units undergo pre-shipment inspection (PSI). If there is an issue with THS4120IDR, 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 THS4120IDR part is unused and in its original packaging.
Return procedure for THS4120IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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