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Texas Instruments THS3491IDDAT
- Part No.:
- THS3491IDDAT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Datasheet:
-
THS3491IDDAT.pdf
- Description:
- IC OPAMP CFA 1 CIRC 8SOPWRPAD
- Quantity:
- Payment:
- Shipping:
Inventory:232
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Product details
Overview
THS3491IDDAT from Texas Instruments is a 900-MHz current feedback amplifier (CFA) designed for high-power, low-distortion output driving in wideband analog signal paths. It delivers ±420 mA linear output current, 8000 V/µs slew rate, and 1.7 nV/√Hz input voltage noise, operating from ±7 V to ±16 V bipolar supplies. It serves as a high-fidelity output driver in arbitrary waveform generators, LCR meter outputs, and piezo element drivers.
For engineers reviewing the THS3491IDDAT datasheet, THS3491IDDAT pinout, THS3491IDDAT application, or THS3491IDDAT equivalent, key selection criteria include small-signal bandwidth (900 MHz), large-signal bandwidth (320 MHz at 10 VPP), output headroom (1.2–1.7 V), thermal shutdown protection, and power-down functionality - all validated for the VQFN-16 (RGT) package.
Technical Context
The THS3491IDDAT implements a current feedback architecture with fixed transimpedance gain (5–8 MΩ open-loop), enabling near-constant bandwidth across gains (2–20 V/V). Its feedback pin (FB) accepts external resistor networks to set closed-loop gain, while internal current-limiting and thermal shutdown protect against overload and overheating.
It features dual supply operation (±7 V to ±16 V), a dedicated power-down pin (PD) with logic-level enable/disable thresholds (VIH = 1.5 V, VIL = 0.8 V), and on-die junction temperature sensing (TJ_SENSE) only in the RGT package - providing real-time thermal monitoring without external sensors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal bandwidth | 900 MHz at 2 VPP output - enables clean amplification of fast edges up to UHF frequencies |
| Large-signal bandwidth | 320 MHz at 10 VPP output - supports high-fidelity 100-MHz+ sine/square wave generation into 100-Ω loads |
| Slew rate | 8000 V/µs - ensures <1.3 ns rise/fall times and <1.5% overshoot for 10-V step responses |
| Linear output current | ±420 mA typical - drives heavy capacitive loads (e.g., piezo elements, FET gates) without clipping |
| Input voltage noise | 1.7 nV/√Hz - preserves SNR in precision wideband signal chains |
| Supply range | ±7 V to ±16 V bipolar - accommodates high-voltage test equipment rails while maintaining stability |
| Harmonic distortion | –76 dBc HD2 / –75 dBc HD3 at 50 MHz, 10 VPP - meets stringent spectral purity requirements |
Pinout & Package
The THS3491IDDAT is packaged in a 16-pin VQFN (RGT) with 3.00 mm × 3.00 mm body size and exposed thermal pad. The package supports high-power dissipation via bottom-side thermal conduction and includes dedicated pins for power-down control and die temperature sensing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback input | Connects to external feedback resistor network to set closed-loop gain; critical for stability and bandwidth control |
| 3 (VIN–), 4 (VIN+) | Differential input terminals | Inverting and noninverting inputs for current feedback topology; high-impedance at VIN+, low-impedance at VIN– |
| 6 (TJ_SENSE) | Junction temperature monitor | Analog voltage output (1.06 V at 25°C, 3.2 mV/°C slope) - enables real-time thermal management without external sensor |
| 10, 11 (VOUT) | Amplifier output | Parallel-output configuration supports high-current drive; requires careful layout to minimize parasitic inductance |
| 13, 14 (+VS), 7, 8 (–VS) | Power supply terminals | Dual-supply pins distributed across package corners to reduce supply impedance and improve PSRR (77–82 dB) |
| 16 (PD) | Power-down control | Active-high logic input (VIH ≥ 1.5 V); disables amplifier with 4 µs turnoff delay and 50 ns turnon delay |
Key Features
| Feature | Design Value |
|---|---|
| Current feedback architecture | Maintains >320 MHz large-signal bandwidth across gain settings (2–20 V/V), unlike voltage-feedback alternatives |
| Thermal shutdown + current limit | Protects device during overload or poor heatsinking; recovers automatically after junction cools below ~145°C |
| Integrated TJ_SENSE | On-die temperature sensor (pin 6) provides calibrated analog output - eliminates need for external thermal ICs in compact designs |
| Low-noise, high-slew design | 1.7 nV/√Hz input noise + 8000 V/µs slew rate enables high-fidelity, high-voltage arbitrary waveform generation |
| Power-down mode | Reduces quiescent current from 16.8 mA to <1 mA per rail - essential for battery-powered or duty-cycled test instrumentation |
Applications
| Arbitrary Waveform Generators | LCR Meter Output Drivers |
|---|---|
Use Scenario: Generating programmable high-voltage, high-frequency test signals (e.g., 10 VPP, 50 MHz sine) for component characterization. IC Role / Device Role / Timing Role: Final-stage wideband output driver delivering precise amplitude and phase fidelity into reactive DUT loads. Use Value: 900-MHz small-signal bandwidth and –75 dBc HD3 at 50 MHz ensure minimal harmonic contamination during impedance sweeps. |
Use Scenario: Driving AC excitation signals (e.g., 1 kHz–10 MHz, 5–15 VPP) across unknown passive components under test. IC Role / Device Role / Timing Role: High-current, low-distortion buffer isolating measurement circuitry from variable load impedances. Use Value: ±420 mA linear output current maintains signal integrity into highly capacitive or inductive DUTs without gain compression. |
| Piezo Element Drivers | VDSL Line Drivers |
Use Scenario: Actuating high-capacitance piezoelectric transducers (nF-range) requiring fast, high-voltage step responses. IC Role / Device Role / Timing Role: High-slew, high-current voltage amplifier converting low-voltage DAC outputs into mechanical displacement signals. Use Value: 8000 V/µs slew rate achieves sub-ns edge fidelity needed for precise time-of-flight or resonant frequency control. |
Use Scenario: Transmitting broadband DSL signals (up to 30 MHz) over twisted-pair lines with precise line impedance matching. IC Role / Device Role / Timing Role: Differential line driver stage ensuring flat frequency response and low group delay variation across band. Use Value: 320-MHz large-signal bandwidth and <1.5% overshoot preserve symbol integrity in multi-tone VDSL2 profiles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed current feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| THS3095DDA | Lower 190-MHz large-signal bandwidth, ±250 mA output current, no TJ_SENSE, HSOIC-8 package | Legacy upgrade path only; lacks thermal monitoring and bandwidth for >30-MHz arbitrary waveforms | Choose THS3095DDA only for cost-sensitive, lower-bandwidth replacements where PCB footprint matches and thermal margin is sufficient. |
| THS3217D | Single-channel, 490-MHz SSBW, ±250 mA output, no power-down or TJ_SENSE, SOIC-8 | No integrated thermal sensing or power-down; limited to fixed-gain configurations without FB pin flexibility | Select THS3217D when board space is constrained and thermal monitoring is handled externally, but avoid for new high-fidelity waveform designs. |
Compared with THS3491IDDAT, THS3095DDA offers pin-compatible legacy replacement with reduced performance, while THS3217D trades thermal intelligence and configurability for smaller footprint - neither matches THS3491IDDAT's combination of 900-MHz bandwidth, ±420 mA drive, and on-die temperature sensing in the RGT package.
Availability
THS3491IDDAT is available at Aetrix Electronics and suitable for high-voltage arbitrary waveform generators, LCR meter output stages, piezo actuator drivers, and VDSL line drivers requiring stable component supply and long-term production continuity.
Supply support for THS3491IDDAT 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 THS3491IDDAT belongs to TI's high-power, ultra-wideband current feedback amplifier product line, engineered specifically for test and measurement, communications infrastructure, and industrial actuation systems demanding low distortion at high output voltage and current.
FAQ
What is the maximum output voltage swing supported by the THS3491IDDAT?
The THS3491IDDAT delivers up to 28 VPP output swing into a 100-Ω load with ±16-V supplies. Its output headroom is specified as 1.2–1.7 V relative to either supply rail, enabling >26 VPP usable swing on ±15-V rails - critical for high-voltage test equipment and piezo drivers.
Does the THS3491IDDAT support single-supply operation?
Yes, the THS3491IDDAT operates from a single 14-V to 32-V supply. Internal biasing allows rail-to-rail input common-mode range and output swing centered near mid-supply, making it suitable for portable or isolated high-voltage signal sources without dual supplies.
How does the TJ_SENSE pin on the THS3491IDDAT function?
The TJ_SENSE pin (Pin 6) outputs a voltage proportional to die temperature: 1.06 V at 25°C with a 3.2 mV/°C coefficient. This analog signal enables real-time thermal monitoring in the THS3491IDDAT's VQFN package - no external sensor required - supporting dynamic thermal throttling or system-level fault detection.
What is the purpose of the FB pin on the THS3491IDDAT?
The FB (feedback) pin is the inverting input node of the THS3491IDDAT's current feedback amplifier. It connects directly to the external feedback resistor (RF), forming the gain-setting network with RG. Unlike voltage-feedback op-amps, this pin defines transimpedance gain and critically impacts stability, bandwidth, and phase margin.
Can the THS3491IDDAT drive capacitive loads without oscillation?
Yes - the THS3491IDDAT is characterized to drive up to 100 pF with series isolation resistors (e.g., 1 Ω) while maintaining stability. Its current feedback architecture inherently tolerates higher capacitive loading than voltage-feedback amplifiers, though layout optimization (short traces, ground plane) remains essential for >10 pF loads.
THS3491IDDAT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-PowerSOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 8000V/µs
- Gain Bandwidth Product:
- 900 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- -
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 16.8mA
- Current - Output / Channel:
- 620 mA
- Voltage - Supply Span (Min):
- 14 V
- Voltage - Supply Span (Max):
- 32 V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO PowerPad
THS3491IDDAT FAQ
1.How can I place an order for THS3491IDDAT through Aetrix?
Please submit a Request for Quotation (RFQ) for THS3491IDDAT 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 THS3491IDDAT reliable?
The price and inventory of THS3491IDDAT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for THS3491IDDAT is usually 5 days.
3.What payment methods are accepted for THS3491IDDAT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for THS3491IDDAT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for THS3491IDDAT?
THS3491IDDAT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your THS3491IDDAT 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 THS3491IDDAT?
For technical support, including THS3491IDDAT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your THS3491IDDAT requirements.
6.How does Aetrix verify that THS3491IDDAT is sourced from the original manufacturer or authorized distributors?
All THS3491IDDAT 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 THS3491IDDAT meets industry standards.
7.What is the process for return or replacement of THS3491IDDAT?
All THS3491IDDAT units undergo pre-shipment inspection (PSI). If there is an issue with THS3491IDDAT, 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 THS3491IDDAT part is unused and in its original packaging.
Return procedure for THS3491IDDAT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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