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Texas Instruments OPA3684IDRG4
- Part No.:
- OPA3684IDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA3684IDRG4.pdf
- Description:
- IC OPAMP CFA 3 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,385
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Product details
Overview
OPA3684IDRG4 from Texas Instruments is a triple-channel, low-power current-feedback operational amplifier with independent disable control per channel, 170MHz bandwidth at G = +2, < –82dBc harmonic distortion at 5MHz, and 120mA output drive capability. It operates from ±2.5V to ±6V dual supplies or +2.8V to +12V single supply, and is used in RGB line drivers and ADC input stages requiring high fidelity and low power.
For engineers reviewing the OPA3684IDRG4 datasheet, OPA3684IDRG4 pinout, OPA3684IDRG4 application, or OPA3684IDRG4 equivalent, key selection considerations include its CFBPLUS architecture enabling stable bandwidth across gain (120MHz up to G = +10), 1.7mA/ch quiescent current, ±4V output swing on ±5V supplies, and SO-14 package compatibility with video signal chain layouts.
Technical Context
The OPA3684IDRG4 employs a patented CFBPLUS architecture featuring an internally closed-loop input buffer stage that linearizes inverting-input impedance, minimizing bandwidth degradation and harmonic distortion over wide gain ranges. This architecture decouples feedback resistor (RF) selection from bandwidth trade-offs, allowing flexible peaking and summing configurations without sacrificing stability.
Each of the three channels includes a dedicated disable pin (DIS A/B/C) enabling independent channel shutdown with < 100µA/ch supply current and 40ns enable time. The amplifier supports both DC-coupled (±5V) and AC-coupled (+5V) operation, with input common-mode range extending to ±3.6V and output swing to ±3.8V on ±5V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +2) | 170MHz - enables full HD RGB signal amplification with minimal phase shift |
| Harmonic Distortion (5MHz) | < –82dBc (RL ≥ 1kΩ) - preserves NTSC/PAL video integrity and ADC SNR |
| Output Current | ±120mA - drives 50Ω doubly-terminated cables or multiple 150Ω video loads |
| Supply Current/Ch | 1.7mA - supports battery-powered portable video equipment and multi-channel systems |
| Disable Current/Ch | 100µA - reduces system standby power by >94% per disabled channel |
| Input Voltage Noise | 3.7nV/√Hz - maintains signal-to-noise ratio in precision ADC front-ends |
| Slew Rate (G = +2) | 750V/µs - ensures faithful reproduction of fast video edges and transient signals |
Pinout & Package
OPA3684IDRG4 is housed in a 14-pin SOIC (SO-14) package with standard JEDEC MS-012AC footprint (5.0mm × 6.2mm, 1.27mm pitch). Thermal resistance θJA is 100°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | DIS A | Active-low disable control for Channel A; open or HIGH = normal operation |
| 2 | DIS B | Active-low disable control for Channel B; independent of other channels |
| 3 | DIS C | Active-low disable control for Channel C; enables selective channel power gating |
| 4 | +VS | Positive supply rail; supports ±2.5V to ±6V or +2.8V to +12V operation |
| 5 | +Input A | Noninverting input for Channel A; 50kΩ || 2pF input impedance |
| 6 | –Input A | Inverting input for Channel A; 4.0Ω linearized impedance via CFBPLUS buffer |
| 7 | Output A | Amplified output for Channel A; capable of ±4V swing into 1kΩ load |
| 8 | Output C | Amplified output for Channel C; electrically isolated from Channels A/B |
| 9 | –Input C | Inverting input for Channel C; same buffered architecture as Pin 6 |
| 10 | +Input C | Noninverting input for Channel C; identical to Pin 5 in electrical behavior |
| 11 | –VS | Negative supply rail; required for dual-supply operation; tied to ground for single-supply |
| 12 | +Input B | Noninverting input for Channel B; fully independent signal path |
| 13 | –Input B | Inverting input for Channel B; shares CFBPLUS architecture but no shared nodes |
| 14 | Output B | Amplified output for Channel B; supports simultaneous 3-channel video routing |
Key Features
| Feature | Design Value |
|---|---|
| CFBPLUS architecture | Internally buffered inverting input delivers near-constant bandwidth from G = +1 to +20, eliminating traditional CFB gain-bandwidth trade-off |
| Independent channel disable | Three dedicated DIS pins allow per-channel power gating without affecting adjacent amplifiers' bias or output states |
| Wide supply flexibility | Operates from ±2.5V to ±6V or +2.8V to +12V, enabling reuse across legacy ±5V and modern low-voltage embedded platforms |
| Low-distortion video drive | Differential gain/phase of 0.04%/0.02° (NTSC) meets broadcast-grade video specifications without external trimming |
| High-output-current capability | Delivers > ±3Vp-p into 50Ω while maintaining < –82dBc distortion - sufficient for studio camera sensor interfaces |
Applications
| RGB Line Drivers | ADC Input Drivers |
|---|---|
|
Use Scenario: Driving red, green, and blue analog video signals from graphics processors to display panels or video encoders. IC Role / Device Role / Timing Role: Triple-channel voltage buffer with matched gain, phase, and settling across all three paths to preserve color fidelity and timing alignment. Use Value: 170MHz bandwidth and < –82dBc distortion ensure full HD resolution with no visible crosstalk or hue shift in professional monitors. |
Use Scenario: Conditioning analog sensor outputs prior to sampling by high-speed SAR or pipeline ADCs. IC Role / Device Role / Timing Role: Low-noise, fast-settling driver providing precise DC offset control and broadband signal integrity to ADC input pins. Use Value: 3.7nV/√Hz input voltage noise and 750V/µs slew rate minimize aperture uncertainty and maintain ENOB at 10+ bits up to 10MHz. |
| Low-Power Broadcast Video | Professional Cameras |
|
Use Scenario: Signal distribution in portable ENG (electronic news gathering) equipment where thermal and battery life constraints are critical. IC Role / Device Role / Timing Role: Low-quiescent-current (1.7mA/ch) video amplifier supporting NTSC/PAL standards with integrated disable for unused channels. Use Value: 100µA/ch shutdown current extends field-deployed battery runtime by hours while preserving instant-on readiness. |
Use Scenario: Front-end amplification for CMOS image sensor outputs in 4K cinema cameras requiring minimal added noise and distortion. IC Role / Device Role / Timing Role: Precision current-feedback amplifier delivering high output current (±120mA) into short coaxial cable runs to FPGA-based image processors. Use Value: ±4V output swing on ±5V supplies and 0.04% differential gain meet ARRI/Blackmagic broadcast compliance requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2684 | Dual-channel version with identical CFBPLUS architecture, 170MHz bandwidth, and 1.7mA/ch supply current; same SO-8 package. | Lacks third channel and individual DIS pins; suitable only for two-channel systems. | Select when board space or cost optimization favors dual-channel integration and channel disable is not required. |
| OPA3691 | Triple-channel CFB amplifier with higher 300MHz bandwidth and 5.3mA/ch supply current; uses SSOP-16 package. | Higher power consumption and thermal density; requires layout revision due to different footprint and pinout. | Select when bandwidth >200MHz is mandatory and thermal management allows higher quiescent current. |
Compared with OPA2684 and OPA3691, the OPA3684IDRG4 uniquely balances triple-channel count, ultra-low power (1.7mA/ch), and SO-14 compatibility-making it optimal for space-constrained, battery-sensitive RGB and ADC driver designs where 170MHz suffices.
Availability
OPA3684IDRG4 is available at Aetrix Electronics and suitable for RGB line drivers, ADC input drivers, low-power broadcast video systems, and professional camera front-ends requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for OPA3684IDRG4 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 innovation in high-performance op amps and signal chain solutions.
The OPA3684IDRG4 belongs to TI's CFBPLUS current-feedback op amp product line, engineered specifically for low-power, high-fidelity video and data acquisition applications demanding wide bandwidth, low distortion, and flexible supply operation.
FAQ
What supply voltages does the OPA3684IDRG4 support?
The OPA3684IDRG4 supports dual-supply operation from ±2.5V to ±6V and single-supply operation from +2.8V to +12V. At ±5V, it delivers ±4V output swing into 1kΩ; at +5V, it provides 0.9V to 4.1V output range with 1.44mA/ch quiescent current. Its internal biasing remains stable across this full range, ensuring consistent bandwidth and distortion performance without recalibration.
How does the CFBPLUS architecture improve performance over standard CFB op amps?
The CFBPLUS architecture in the OPA3684IDRG4 integrates a closed-loop input buffer that linearizes the inverting-input impedance, reducing sensitivity to feedback resistor value and gain configuration. This yields nearly constant 120MHz bandwidth up to G = +10 and < –82dBc distortion at 5MHz-unlike conventional CFB amplifiers whose bandwidth collapses sharply above G = +2. The result is predictable, design-friendly behavior in summing, filtering, and gain-setting circuits.
Can the OPA3684IDRG4 drive 50Ω transmission lines directly?
Yes, the OPA3684IDRG4 can drive 50Ω loads directly, delivering > ±3Vp-p with < –82dBc distortion at 5MHz when configured for G = +2. Its 120mA output current and low closed-loop output impedance (0.006Ω at 100kHz) ensure minimal signal loss and reflection. For best results, use series termination at the source and match RF to 800Ω (dual supply) or 1.0kΩ (single supply) per the datasheet recommendations.
What is the function of the DIS pins on the OPA3684IDRG4?
The OPA3684IDRG4 features three independent disable pins (DIS A, DIS B, DIS C) - one per channel - that place the respective amplifier into ultra-low-power state (< 100µA/ch) when pulled LOW. In disable mode, the I/O pins enter high-impedance state, preventing loading of upstream/downstream circuitry. Enable time is 40ns, allowing rapid channel reactivation for burst-mode video or multiplexed sensor systems.
Is the OPA3684IDRG4 suitable for single-supply ADC driver applications?
Yes, the OPA3684IDRG4 is explicitly characterized for +5V single-supply operation with AC-coupled inputs and outputs. It provides 110MHz bandwidth (G = +2), 380V/µs slew rate, and 0.04% differential gain - meeting requirements for driving 10-bit+ SAR and pipeline ADCs in portable instrumentation. Its input common-mode range (1.25V to 3.75V) and output swing (0.9V to 4.1V) align precisely with typical ADC reference midpoints and input rails.
OPA3684IDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 3
- Output Type:
- -
- Slew Rate:
- 780V/µs
- Gain Bandwidth Product:
- 1.9 GHz
- -3db Bandwidth:
- 250 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):
- 2.8 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA3684IDRG4 FAQ
1.How can I place an order for OPA3684IDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA3684IDRG4 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 OPA3684IDRG4 reliable?
The price and inventory of OPA3684IDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA3684IDRG4 is usually 5 days.
3.What payment methods are accepted for OPA3684IDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA3684IDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA3684IDRG4?
OPA3684IDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA3684IDRG4 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 OPA3684IDRG4?
For technical support, including OPA3684IDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA3684IDRG4 requirements.
6.How does Aetrix verify that OPA3684IDRG4 is sourced from the original manufacturer or authorized distributors?
All OPA3684IDRG4 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 OPA3684IDRG4 meets industry standards.
7.What is the process for return or replacement of OPA3684IDRG4?
All OPA3684IDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA3684IDRG4, 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 OPA3684IDRG4 part is unused and in its original packaging.
Return procedure for OPA3684IDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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