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Texas Instruments OPA3684ID
- Part No.:
- OPA3684ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA3684ID.pdf
- Description:
- IC OPAMP CFA 3 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
OPA3684ID from Texas Instruments is a triple-channel, low-power current-feedback operational amplifier with individual disable control per channel, 170MHz bandwidth at G = +2, 120mA output drive, and ±5V/±6V dual-supply or +5V to +12V single-supply operation - deployed in RGB line drivers and broadcast video signal conditioning.
For engineers reviewing the OPA3684ID datasheet, OPA3684ID pinout, OPA3684ID application, or OPA3684ID equivalent, key selection considerations include gain-bandwidth stability across G = +1 to +20, < –82dBc harmonic distortion at 5MHz (RL ≥ 1kΩ), shutdown current of 100µA/ch, and SO-14 package compatibility with high-density video routing layouts.
Technical Context
The OPA3684ID implements CFBPLUS architecture with an internally closed-loop input buffer stage that linearizes inverting-input impedance, enabling minimal bandwidth variation versus gain and improved harmonic distortion over conventional low-power CFB amplifiers. Its transimpedance gain is 355kΩ (min) with 4.5Ω inverting input resistance.
Each channel features independent disable logic with 40ns enable time and 4ms disable time, supporting dynamic power management in multichannel video systems. The amplifier maintains >120MHz bandwidth up to G = +10 and delivers ±4Vp-p swing on ±5V supplies with 1.7mA/ch quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +2) | 170MHz min - enables full HD video signal amplification without phase loss at baseband |
| Output Current | 120mA min sourcing - drives three 150Ω video loads or doubly terminated 50Ω cables |
| Harmonic Distortion | < –82dBc (2nd, 5MHz, RL ≥ 1kΩ) - meets NTSC/PAL differential gain/phase specs for professional cameras |
| Supply Current | 1.7mA/ch typ - supports battery-powered portable video equipment with thermal headroom |
| Disable Current | 100µA/ch max - reduces system standby power by >94% per idle channel |
| Input Voltage Range | ±3.75V min (±5V supply) - accommodates DC-coupled RGB signals without level-shifting |
| Slew Rate | 750V/µs min (G = +2) - preserves edge integrity in fast-switching digital video interfaces |
Pinout & Package
OPA3684ID is housed in a 14-pin SOIC (SO-14) package with exposed pad not present; thermal resistance θJA = 100°C/W. Pin functions are validated per TI SBOS241C datasheet Figure 1 (top view).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIS A) | Channel A disable control | Active-low logic: ≤1.5V disables channel A, placing output in high-Z state |
| 2 (DIS B) | Channel B disable control | Independent per-channel shutdown enables selective power gating in multi-signal paths |
| 3 (DIS C) | Channel C disable control | Allows dynamic reconfiguration of RGB or YUV channel sets without PCB changes |
| 4 (+VS) | Positive supply rail | Accepts +2.5V to +12V (single) or ±2.5V to ±6V (dual); internal biasing ensures stable performance across range |
| 5 (+Input A) | Noninverting input, Channel A | 50kΩ || 2pF input impedance - minimizes loading on preceding video DAC or buffer stage |
| 6 (–Input A) | Inverting input, Channel A | 4.0Ω input resistance - defines feedback network interaction and bandwidth predictability |
| 7 (Output A) | Amplified output, Channel A | Capable of ±4Vp-p swing into 1kΩ; closed-loop output impedance = 6mΩ at 100kHz |
| 8 (Output C) | Amplified output, Channel C | Electrically isolated from Output A/B - critical for crosstalk-sensitive RGB separation |
| 9 (–Input C) | Inverting input, Channel C | Same 4.0Ω resistance as Channel A - ensures matched gain-setting behavior across all channels |
| 10 (+Input C) | Noninverting input, Channel C | Identical 50kΩ || 2pF impedance - guarantees uniform AC coupling and bias network design |
| 11 (–VS) | Negative supply rail | Required for dual-supply operation; omitted in single-supply configurations using +5V only |
| 12 (+Input B) | Noninverting input, Channel B | Enables identical layout replication for all three channels in compact video routing |
| 13 (–Input B) | Inverting input, Channel B | Matches Channels A/C for consistent feedback resistor selection and layout symmetry |
| 14 (Output B) | Amplified output, Channel B | Supports simultaneous triple-output drive with <70dB all-hostile crosstalk at 5MHz |
Key Features
| Feature | Design Value |
|---|---|
| CFBPLUS architecture | Internally buffered inverting input yields linearized 4Ω impedance, enabling stable bandwidth from G = +1 to +20 |
| Triple independent disable | Per-channel logic control allows dynamic power scaling - e.g., disable unused chroma channels during monochrome mode |
| Single-supply capability | +5V operation with 1.25V input headroom and 1.0V output headroom enables direct interface with 3.3V logic and ADC drivers |
| Low distortion at high frequency | –84dBc 3rd-harmonic (5MHz, RL ≥ 1kΩ) supports broadcast-grade video fidelity without post-filtering |
| High output drive into video loads | Delivers >±3Vp-p into 50Ω while maintaining <0.04% differential gain error - compliant with SMPTE 253M |
Applications
| RGB Line Drivers | Low-Power Broadcast Video Drivers |
|---|---|
Use Scenario: Driving analog RGB signals from graphics processors to display panels or projectors over 150Ω coaxial cables. IC Role / Device Role / Timing Role: Triple-channel voltage buffer with DC coupling, gain = +2, and matched propagation delay across R/G/B paths. Use Value: Maintains <0.04% differential gain and 0.02° differential phase error across NTSC spectrum, preserving color fidelity without external calibration. | Use Scenario: Signal conditioning in portable ENG cameras and field production switchers operating from battery or 12V vehicle power. IC Role / Device Role / Timing Role: Low-quiescent-current video amplifier supporting both +5V single-supply and ±5V dual-supply modes with seamless switchover. Use Value: 1.7mA/ch supply current extends battery life >8 hours; 120mA output sustains 3× 150Ω loads simultaneously without thermal throttling. |
| ADC Input Drivers | Professional Cameras |
Use Scenario: Driving high-speed ADC inputs (e.g., 10-bit, 40MSPS) in medical imaging or test equipment front-ends. IC Role / Device Role / Timing Role: Wideband, low-noise buffer with 3.7nV/√Hz input voltage noise and 750V/µs slew rate to preserve SNR and transient response. Use Value: Enables full-scale 2Vp-p sine-wave input at 5MHz with <–82dBc THD+N, directly meeting ENOB >9.5 bits for 10-bit converters. | Use Scenario: Real-time image processing pipeline in 4K-capable studio cameras requiring simultaneous RGB/YUV path amplification. IC Role / Device Role / Timing Role: Triple-channel amplifier with independent disable pins enabling dynamic channel allocation (e.g., R+G+B active, Y+U+V active, or mixed mode). Use Value: 40ns channel enable time allows sub-frame reconfiguration; <70dB inter-channel crosstalk prevents luminance-chroma bleed in high-resolution sensors. |
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; identical CFBPLUS architecture, same 170MHz bandwidth and 120mA drive, but lacks third channel and DIS C pin | Not suitable for RGB or 3-channel parallel architectures; requires two devices for triple functionality | Select OPA2684 only when dual-channel count matches system topology and board space permits two SO-8 packages instead of one SO-14 |
| OPA3691 | Higher power: 3.5mA/ch supply current, 250mA output, 300MHz bandwidth; no disable function; SSOP-16 package | Better for high-fidelity broadcast distribution where power budget allows; unsuitable for battery-powered or thermally constrained designs | Choose OPA3691 when >200MHz bandwidth or >200mA drive is required and per-channel shutdown is unnecessary |
Compared with OPA2684 and OPA3691, the OPA3684ID uniquely balances triple-channel integration, 1.7mA/ch efficiency, and independent disable control in a single SO-14 package - making it optimal for space-constrained, multi-signal video systems requiring dynamic power management.
Availability
OPA3684ID is available at Aetrix Electronics and suitable for RGB line drivers, low-power broadcast video drivers, and ADC input drivers requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for OPA3684ID 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 precision amplifiers, data converters, and power management ICs.
The OPA3684ID belongs to TI's CFBPLUS current-feedback op amp product line, engineered specifically for high-fidelity, low-power video signal conditioning in professional imaging, broadcast, and test equipment.
FAQ
What supply voltage ranges does the OPA3684ID support?
The OPA3684ID supports dual-supply operation from ±2.5V to ±6V and single-supply operation from +2.8V to +12V. At ±5V, it delivers 170MHz bandwidth and ±4Vp-p output swing; at +5V, bandwidth reduces to 110MHz but retains full functionality with 1.25V input and 1.0V output headroom - verified per TI SBOS241C Section "ELECTRICAL CHARACTERISTICS: VS = +5V".
How does the disable function operate on the OPA3684ID?
The OPA3684ID features three independent active-low disable pins (DIS A, DIS B, DIS C). Pulling any pin below 1.5V (max) disables its corresponding channel, reducing supply current to <100µA/ch and placing the output in high-impedance state. Enable time is 40ns; disable time is 4ms - confirmed in Electrical Characteristics Table under "DISABLE" section of the OPA3684ID datasheet.
What is the maximum load the OPA3684ID can drive while maintaining video specifications?
The OPA3684ID drives up to three 150Ω video loads simultaneously while maintaining <0.04% differential gain and 0.02° differential phase error (NTSC, G = +2). Into 50Ω, it delivers >±3Vp-p with <–82dBc 2nd-harmonic distortion at 5MHz - data validated in "OUTPUT" and "APPLICATIONS INFORMATION" sections of the OPA3684ID datasheet.
Does the OPA3684ID require external compensation for stability?
No external compensation is required for the OPA3684ID. Its CFBPLUS architecture provides inherently stable operation with recommended feedback resistors (RF = 800Ω for ±5V, RF = 1.0kΩ for +5V). Bandwidth peaking remains <6.3dB at G = +1, and 0.1dB gain flatness extends to 19MHz - values measured per Figure 1 and Table "AC PERFORMANCE" in the OPA3684ID datasheet.
What package type is used for the OPA3684ID, and is thermal performance documented?
The OPA3684ID uses a 14-pin SOIC (SO-14) package with θJA = 100°C/W, specified in the "PACKAGE/ORDERING INFORMATION" table of the OPA3684ID datasheet. No exposed thermal pad is present. Junction-to-ambient thermal resistance is characterized across –40°C to +85°C ambient, supporting operation in sealed enclosures without forced airflow when power dissipation remains <300mW per channel.
OPA3684ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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
OPA3684ID FAQ
1.How can I place an order for OPA3684ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA3684ID 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 OPA3684ID reliable?
The price and inventory of OPA3684ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA3684ID is usually 5 days.
3.What payment methods are accepted for OPA3684ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA3684ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA3684ID?
OPA3684ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA3684ID 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 OPA3684ID?
For technical support, including OPA3684ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA3684ID requirements.
6.How does Aetrix verify that OPA3684ID is sourced from the original manufacturer or authorized distributors?
All OPA3684ID 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 OPA3684ID meets industry standards.
7.What is the process for return or replacement of OPA3684ID?
All OPA3684ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA3684ID, 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 OPA3684ID part is unused and in its original packaging.
Return procedure for OPA3684ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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