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Texas Instruments OPA684IDBVT
- Part No.:
- OPA684IDBVT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA684IDBVT.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:241
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Product details
Overview
OPA684IDBVT from Texas Instruments is a low-power, current-feedback operational amplifier with disable control, designed for high-bandwidth video and signal conditioning applications. It delivers 120MHz bandwidth at G = +10, –78dBc 2nd-harmonic distortion at 5MHz (RL ≥ 1kΩ), ±4V output swing on ±5V supplies, and 1.7mA quiescent current - enabling broadcast video drivers and ADC input stages in space- and power-constrained systems.
For engineers reviewing the OPA684IDBVT datasheet, OPA684IDBVT pinout, OPA684IDBVT application, or OPA684IDBVT equivalent, key selection criteria include its CFBplus architecture's gain-independent bandwidth, 100µA shutdown current, SOT-23-6 package footprint, and verified performance in NTSC composite video (0.04% differential gain, 0.02° differential phase) under ±5V operation.
Technical Context
The OPA684IDBVT implements a patented CFBplus architecture featuring an internally closed-loop input buffer stage that linearizes inverting-input impedance, minimizing bandwidth degradation and harmonic distortion across gain settings. Its transimpedance gain remains stable at ≥153kΩ over –40°C to +85°C, supporting consistent feedback loop behavior.
This architecture enables true gain-bandwidth independence: small-signal bandwidth stays ≥104MHz from G = +2 to G = +20 (RF = 1kΩ), while large-signal bandwidth holds ≥90MHz at G = +2, VO = 4VPP - critical for multichannel summing and equalizing filter designs requiring flat response up to 100MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +10) | 120MHz - supports full HD video baseband (≈75MHz) with >20MHz margin for filter roll-off compensation. |
| 2nd-Harmonic Distortion (5MHz, RL ≥ 1kΩ) | –78dBc - ensures <0.01% nonlinear error in precision ADC front-ends and professional camera signal chains. |
| Output Current (Sourcing) | 160mA min - drives dual-terminated 50Ω cables or four 150Ω video loads simultaneously without clipping. |
| Quiescent Current | 1.7mA max (±5V) - enables battery-powered portable test equipment and low-power imaging modules. |
| Disable Current | 100µA max - reduces system standby power by 94% versus active mode, ideal for time-gated signal acquisition. |
| Input Voltage Noise | 3.7nV/√Hz - preserves SNR in wideband sensor interfaces where noise dominates dynamic range. |
| Enable Time | 40ns typ - allows rapid channel switching in multiplexed data acquisition systems without settling artifacts. |
Pinout & Package
SOT-23-6 package (DBV), 2.9mm × 1.6mm footprint, 0.95mm height, thermal resistance θJA = 150°C/W - optimized for compact PCB layouts in handheld instruments and embedded vision modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Delivers ±4V swing into 100Ω; closed-loop output impedance 6mΩ at 100kHz enables stable driving of reactive video loads. |
| 2 (–VS) | Negative Supply Rail | Accepts –2.5V to –6.0V; internal biasing maintains performance across full bipolar supply range. |
| 3 (+IN) | Noninverting Input | 50kΩ || 2pF input impedance; common-mode range extends to ±3.75V on ±5V supplies. |
| 4 (+VS) | Positive Supply Rail | Accepts +2.5V to +6.0V; PSRR ≥60dB minimizes supply ripple coupling into signal path. |
| 5 (DIS) | Disable Control (Active-Low) | Pull ≤1.5V to enter shutdown; 80µA input bias allows direct GPIO control without level-shifting. |
| 6 (–IN) | Inverting Input | 2.5Ω linearized input resistance; low and stable impedance enables predictable RF/RI gain setting and bandwidth control. |
Key Features
| Feature | Design Value |
|---|---|
| CFBplus Architecture | Internally buffered inverting input eliminates gain-dependent bandwidth collapse - maintains ≥104MHz BW from G=+2 to G=+20. |
| Video-Optimized Linearity | 0.04% differential gain / 0.02° differential phase (NTSC, RL=150Ω) meets broadcast-grade video fidelity requirements. |
| Single-Supply Flexibility | Operates from +2.8V to +12V; 1.25V input headroom and 0.9V output headroom enable rail-to-rail signal handling on +5V systems. |
| Fast Enable/Disable | 40ns turn-on / 4ms turn-off times support burst-mode operation in automated test equipment and time-domain reflectometry. |
| Thermal Robustness | Specified from –40°C to +85°C with <±12µV/°C offset drift - suitable for industrial camera housings and outdoor broadcast enclosures. |
Applications
| Professional Broadcast Video Drivers | ADC Input Drivers |
|---|---|
Use Scenario: Driving multiple 150Ω composite video loads in studio switchers with minimal crosstalk and timing skew. IC Role / Device Role / Timing Role: Final-stage line driver providing gain, isolation, and drive strength before coaxial transmission. Use Value: Delivers <0.1% dG/dP across four parallel loads while consuming <2mA per channel - reducing thermal load in dense rack-mounted systems. | Use Scenario: Conditioning analog sensor outputs prior to 12-bit+ SAR or pipeline ADCs in test instrumentation. IC Role / Device Role / Timing Role: Wideband buffer and gain stage matching ADC input impedance and voltage range. Use Value: –78dBc 2nd-harmonic distortion preserves SFDR >75dB; 120MHz bandwidth accommodates anti-aliasing filters with steep roll-off. |
| Equalizing Filters | Multichannel Summing Amplifiers |
Use Scenario: Compensating frequency-dependent loss in long coaxial cable runs (e.g., security camera backhauls). IC Role / Device Role / Timing Role: Active peaking stage in 2nd-order SAW filter post-amplifier topology. Use Value: Gain-flatness bandwidth of 19MHz (0.1dB) at G=+2 enables precise 10–20MHz correction without phase distortion. | Use Scenario: Summing outputs from four synchronized RF demodulators in spectrum analyzers. IC Role / Device Role / Timing Role: High-speed inverting summing node with matched input impedances. Use Value: Inverting configuration achieves >90MHz large-signal bandwidth at G=–1, preserving transient integrity across summed channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA683IDBVT | Lower quiescent current (1.3mA vs 1.7mA), reduced bandwidth (80MHz at G=+10), same SOT-23-6 package. | Better suited for ultra-low-power battery-operated sensors where bandwidth <80MHz suffices. | Select when power budget is tighter than bandwidth requirement; verify harmonic distortion meets –70dBc minimum. |
| OPA691IDBVT | Higher slew rate (1800V/µs vs 820V/µs), higher supply current (5.5mA), same pinout but SO-8 only (no SOT-23-6 variant). | Required for >200MHz small-signal bandwidth or >10VPP output swing applications. | Choose when OPA684IDBVT bandwidth or output drive is insufficient; note PCB redesign needed for SO-8. |
Compared with OPA683IDBVT and OPA691IDBVT, the OPA684IDBVT uniquely balances 120MHz bandwidth, –78dBc distortion, and 1.7mA quiescent current in the space-constrained SOT-23-6 package - making it optimal for portable video test gear and multi-channel data acquisition where thermal density and layout area are limiting factors.
Availability
OPA684IDBVT is available at Aetrix Electronics and suitable for professional broadcast video drivers, ADC input stages, equalizing filters, and multichannel summing amplifiers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA684IDBVT 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 company specializing in analog and embedded processing technologies, with leadership in high-performance op amps, data converters, and power management ICs.
The OPA684IDBVT belongs to TI's CFBplus current-feedback amplifier product line, engineered specifically for wideband video, communications, and instrumentation applications demanding low power, high linearity, and gain-stable bandwidth.
FAQ
What supply voltage ranges does the OPA684IDBVT support?
The OPA684IDBVT operates from ±2.5V to ±6.0V dual supplies or +2.8V to +12V single supply. At ±5V, it delivers full ±4V output swing and 120MHz bandwidth at G = +10. The internal biasing remains stable across this range, with minimal shift in quiescent current or distortion - confirmed in Electrical Characteristics tables for both supply configurations.
How does the OPA684IDBVT achieve gain-independent bandwidth?
The OPA684IDBVT uses a CFBplus architecture with an internally closed-loop input buffer that linearizes the inverting-input impedance to ~2.5Ω. This isolates feedback loop dynamics from gain-setting resistor variations, enabling bandwidth retention: ≥104MHz from G = +2 to G = +20 (RF = 1kΩ), unlike conventional CFB amplifiers whose bandwidth drops sharply with increasing gain.
What is the disable functionality of the OPA684IDBVT and how is it implemented?
The OPA684IDBVT's DIS pin (Pin 5) is active-low: pulling it ≤1.5V disables the amplifier, reducing supply current to ≤100µA and placing I/O pins in high-impedance state. Leaving it open or holding ≥3.4V enables normal operation. Enable time is 40ns; disable time is 4ms - verified in Typical Characteristics curves and Electrical Characteristics table.
Can the OPA684IDBVT drive standard 75Ω video loads?
Yes - the OPA684IDBVT delivers 160mA sourcing current and ±4V swing on ±5V supplies, enabling direct drive of 75Ω loads with >3VPP output. Measured differential gain/phase is 0.04%/0.02° into 150Ω (NTSC), and typical performance scales favorably to 75Ω with proper termination; application circuit Figure 5 in the datasheet confirms robust video line driving capability.
What are the thermal limitations of the OPA684IDBVT in SOT-23-6 package?
In the SOT-23-6 (DBV) package, the OPA684IDBVT has θJA = 150°C/W. At maximum 1.85mA quiescent current and 100mA output load, junction temperature rise is <28°C above ambient - well within the +175°C absolute max rating. Operation is fully specified from –40°C to +85°C, with offset drift <±12µV/°C ensuring stability in uncontrolled environments.
OPA684IDBVT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 820V/µs
- Gain Bandwidth Product:
- 1.9 GHz
- -3db Bandwidth:
- 210 MHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 1.7mA
- Current - Output / Channel:
- 160 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
OPA684IDBVT FAQ
1.How can I place an order for OPA684IDBVT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA684IDBVT 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 OPA684IDBVT reliable?
The price and inventory of OPA684IDBVT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA684IDBVT is usually 5 days.
3.What payment methods are accepted for OPA684IDBVT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA684IDBVT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA684IDBVT?
OPA684IDBVT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA684IDBVT 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 OPA684IDBVT?
For technical support, including OPA684IDBVT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA684IDBVT requirements.
6.How does Aetrix verify that OPA684IDBVT is sourced from the original manufacturer or authorized distributors?
All OPA684IDBVT 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 OPA684IDBVT meets industry standards.
7.What is the process for return or replacement of OPA684IDBVT?
All OPA684IDBVT units undergo pre-shipment inspection (PSI). If there is an issue with OPA684IDBVT, 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 OPA684IDBVT part is unused and in its original packaging.
Return procedure for OPA684IDBVT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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