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Texas Instruments OPA684IDBVRG4
- Part No.:
- OPA684IDBVRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA684IDBVRG4.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:4,646
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Product details
Overview
OPA684IDBVRG4 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 OPA684IDBVRG4 datasheet, OPA684IDBVRG4 pinout, OPA684IDBVRG4 application, or OPA684IDBVRG4 equivalent, key selection considerations include its CFBplus architecture's gain-invariant bandwidth, 100µA shutdown current, SOT-23-6 package footprint, and dual/±5V or single/+5V supply compatibility for professional camera and equalizing filter designs.
Technical Context
The OPA684IDBVRG4 implements a patented CFBplus architecture featuring an internally closed-loop input buffer stage that linearizes inverting-input impedance, enabling stable bandwidth up to G = +20 without peaking. Its transimpedance gain of 355kΩ (min) and 2.5Ω inverting-input resistance support precise feedback control across wide gain ranges.
This architecture decouples gain-setting resistor (RG) selection from bandwidth degradation - unlike conventional CFB op amps - allowing flexible frequency response shaping, multichannel summing with minimal inter-channel crosstalk, and integration into SAW filter post-amplifier chains where harmonic distortion below –78dBc at 5MHz is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +10) | 120MHz - supports NTSC/PAL video reconstruction and >100Mbps data acquisition front-ends. |
| 2nd-Harmonic Distortion (5MHz, RL ≥ 1kΩ) | –78dBc - ensures <0.04% differential gain error in composite video line driving. |
| Output Current (Sourcing) | 160mA (min) - drives 150Ω video loads or doubly terminated 50Ω cables without clipping. |
| Quiescent Current | 1.7mA (max at ±5V) - enables battery-powered portable instrumentation and multi-channel sensor interfaces. |
| Disable Current | 100µA (max) - reduces system standby power by >94% while maintaining high-impedance I/O pins. |
| Input Voltage Noise | 3.7nV/√Hz - preserves SNR in precision ADC driver stages with 16-bit+ resolution. |
| Slew Rate (G = +2) | 750V/µs (min) - supports fast transient response in pulse amplification and laser diode modulation circuits. |
Pinout & Package
SOT-23-6 package (DBV), 6-pin surface-mount, 2.9mm × 1.6mm footprint, 0.95mm height, thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Delivers full ±4V swing into 100Ω; low 0.006Ω closed-loop output impedance minimizes gain error under load. |
| 2 (–VS) | Negative Supply Rail | Accepts –2.5V to –6V; internal biasing maintains performance across full bipolar supply range. |
| 3 (+IN) | Noninverting Input | 50kΩ || 1pF input impedance; common-mode range extends to ±3.65V at +85°C for robust DC-coupled operation. |
| 4 (+VS) | Positive Supply Rail | Accepts +2.5V to +6V (bipolar) or +2.8V to +12V (single); PSRR >60dB rejects supply noise. |
| 5 (DIS) | Disable Control (Active-Low) | Pulled LOW disables amplifier; 3.4V min enable threshold ensures TTL/CMOS logic compatibility. |
| 6 (–IN) | Inverting Input | 2.5Ω input resistance; low 17pA/√Hz current noise preserves dynamic range in high-Z feedback networks. |
Key Features
| Feature | Design Value |
|---|---|
| CFBplus Architecture | Internally buffered inverting input enables near-constant bandwidth from G = +1 to +20 - eliminating gain-dependent compensation redesign. |
| Low-Power Video Optimization | 0.04% differential gain / 0.02° differential phase at NTSC frequencies enables studio-grade broadcast video line driving with single device. |
| Flexible Supply Operation | Operates from ±2.5V to ±6V or +2.8V to +12V - supports legacy ±5V systems and modern low-voltage embedded platforms. |
| Fast Enable/Disable | 40ns enable time and 4ms disable time allow dynamic power gating in time-sliced signal paths without output glitches. |
| High Output Drive | 120mA sinking / 160mA sourcing capability sustains ±4VPP swing into 100Ω - meets SMPTE 259M/C and HD-SDI drive requirements. |
Applications
| Professional Broadcast Video Drivers | SAW Filter High-Gain Post-Amplifiers |
|---|---|
Use Scenario: Driving multiple 150Ω composite video loads in ENG cameras and OB vans with minimal differential gain/phase error. IC Role / Device Role / Timing Role: Final-stage voltage/current buffer with disable control for power-gated video routing. Use Value: Achieves 0.04%/0.02° dG/dP at NTSC frequencies using only one OPA684IDBVRG4 - reducing BOM count vs. discrete solutions. | Use Scenario: Amplifying narrowband RF signals after surface-acoustic-wave filtering in IF receiver chains. IC Role / Device Role / Timing Role: Low-noise, high-linearity post-filter gain block preserving signal integrity in 5–50MHz bands. Use Value: –78dBc 2nd-harmonic distortion at 5MHz ensures adjacent-channel interference remains below –70dBc in spectrum-analyzer front-ends. |
| Multichannel Summing Amplifiers | ADC Input Drivers |
Use Scenario: Combining outputs from four synchronized analog sensors in medical ultrasound beamforming. IC Role / Device Role / Timing Role: Inverting-summing node with gain-invariant bandwidth for phase-coherent signal addition. Use Value: Maintains >100MHz bandwidth at G = –4 due to CFBplus architecture - enabling >100Msps sampling without summation-induced roll-off. | Use Scenario: Buffering high-speed analog inputs to 16-bit SAR ADCs in automated test equipment. IC Role / Device Role / Timing Role: Low-noise, low-distortion driver isolating ADC input capacitance from source impedance. Use Value: 3.7nV/√Hz input voltage noise and 750V/µs slew rate preserve ENOB >15.2 bits at 10MHz input frequencies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA683IDBVR | Lower quiescent current (1.3mA vs. 1.7mA), reduced bandwidth (80MHz at G=+10), no disable pin. | Better suited for always-on ultra-low-power sensor nodes where shutdown is unnecessary. | Select OPA683IDBVR when power budget is tighter than bandwidth requirement and disable functionality is not needed. |
| OPA691IDBVR | Higher slew rate (1800V/µs), higher supply current (5.3mA), same SOT-23-6 package. | Required for >200MHz small-signal bandwidth or >10VPP output swing applications. | Choose OPA691IDBVR when OPA684IDBVRG4 bandwidth or output voltage swing is insufficient for high-definition video or RF IF stages. |
Compared with OPA683IDBVR, the OPA684IDBVRG4 trades 0.4mA quiescent current for 40MHz extra bandwidth and integrated disable control; versus OPA691IDBVR, it saves 3.6mA supply current while retaining sufficient linearity for SD/HD video - making it optimal for portable broadcast gear with thermal and battery-life constraints.
Availability
OPA684IDBVRG4 is available at Aetrix Electronics and suitable for professional broadcast video drivers, SAW filter post-amplifiers, multichannel summing amplifiers, ADC input drivers, and low-power line drivers requiring stable component supply across industrial temperature ranges.
Supply support for OPA684IDBVRG4 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The OPA684IDBVRG4 belongs to TI's CFBplus current-feedback op amp product line, engineered specifically for high-fidelity, low-power video signal conditioning and broadband analog signal chain applications where gain stability and harmonic purity are critical.
FAQ
What supply voltage ranges does the OPA684IDBVRG4 support?
The OPA684IDBVRG4 operates from ±2.5V to ±6V in dual-supply mode or +2.8V to +12V in single-supply mode. At ±5V, it delivers full ±4V output swing into 100Ω; at +5V, it provides >3VPP swing with 70mA sourcing capability. The internal biasing remains stable across this full range, ensuring consistent bandwidth and distortion performance without external recalibration.
How does the CFBplus architecture of the OPA684IDBVRG4 improve gain-bandwidth trade-offs?
The OPA684IDBVRG4 uses an internally closed-loop input buffer to linearize inverting-input impedance, reducing gain-dependent bandwidth roll-off. This allows 120MHz bandwidth at G = +10 and 104MHz at G = +20 - far exceeding conventional CFB op amps. As a result, gain changes require only RG adjustment without re-optimizing RF, simplifying design of variable-gain video and instrumentation amplifiers.
What is the disable functionality of the OPA684IDBVRG4, and how does it affect system power?
The OPA684IDBVRG4 features an active-low DIS pin (Pin 5). When pulled LOW, supply current drops to ≤100µA while all I/O pins enter high-impedance state - reducing total system power by >94% versus normal operation (1.7mA). Enable time is 40ns, disable time is 4ms, and off isolation exceeds 70dB at 5MHz, making it ideal for time-multiplexed video routing and battery-powered portable instruments.
Can the OPA684IDBVRG4 drive standard 75Ω video loads, and what differential gain/phase performance does it achieve?
Yes, the OPA684IDBVRG4 drives 75Ω and 150Ω video loads with verified performance: at G = +2, NTSC, VO = 1.4Vp, it achieves 0.04% differential gain and 0.02° differential phase error. With four parallel 150Ω loads (equivalent 37.5Ω), dG/dP remains <0.1%/0.1° - meeting SMPTE 259M-C and ITU-R BT.601 requirements for professional broadcast equipment using a single OPA684IDBVRG4.
What are the thermal characteristics of the OPA684IDBVRG4 in its SOT-23-6 package?
The OPA684IDBVRG4 in SOT-23-6 (DBV) package has a junction-to-ambient thermal resistance (θJA) of 150°C/W. At maximum 1.85mA quiescent current and 100mA output load, power dissipation stays below 150mW - limiting junction temperature rise to <23°C above ambient under typical PCB conditions. This enables reliable operation in sealed enclosures and stacked PCB assemblies without forced air cooling.
OPA684IDBVRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
OPA684IDBVRG4 FAQ
1.How can I place an order for OPA684IDBVRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA684IDBVRG4 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 OPA684IDBVRG4 reliable?
The price and inventory of OPA684IDBVRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA684IDBVRG4 is usually 5 days.
3.What payment methods are accepted for OPA684IDBVRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA684IDBVRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA684IDBVRG4?
OPA684IDBVRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA684IDBVRG4 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 OPA684IDBVRG4?
For technical support, including OPA684IDBVRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA684IDBVRG4 requirements.
6.How does Aetrix verify that OPA684IDBVRG4 is sourced from the original manufacturer or authorized distributors?
All OPA684IDBVRG4 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 OPA684IDBVRG4 meets industry standards.
7.What is the process for return or replacement of OPA684IDBVRG4?
All OPA684IDBVRG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA684IDBVRG4, 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 OPA684IDBVRG4 part is unused and in its original packaging.
Return procedure for OPA684IDBVRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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