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Texas Instruments OPA684ID
- Part No.:
- OPA684ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA684ID.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,416
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Product details
Overview
OPA684ID from Texas Instruments is a low-power, current-feedback operational amplifier with disable function in SO-8 package. It delivers 120MHz bandwidth at G = +10, –78dBc 2nd-harmonic distortion at 5MHz (RL ≥ 1kΩ), and 120mA output drive, enabling use as a broadcast video driver or ADC input buffer in ±5V or single +5V systems.
For engineers reviewing the OPA684ID datasheet, OPA684ID pinout, OPA684ID application, or OPA684ID equivalent, key selection criteria include gain-bandwidth stability across G = +1 to +20, low 1.7mA quiescent current, disable-controlled power-down to <100µA, and verified performance into 100Ω loads with ±4VPP swing on ±5V supplies.
Technical Context
The OPA684ID implements CFBplus architecture with an internally closed-loop input buffer stage that linearizes inverting-input impedance, minimizing bandwidth degradation and harmonic distortion versus gain. This enables stable 0.1dB gain flatness up to 19MHz at G = +2 and supports peaking networks without destabilization.
Its transimpedance open-loop gain of 355kΩ (min) and 2.5Ω inverting-input resistance define current-sensing behavior, while the DIS pin provides TTL-compatible enable/disable control with 40ns turn-on and 4ms turn-off timing-critical for power-gated signal chains in portable or multi-channel video systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal BW (G = +10) | 120MHz typical - maintains usable bandwidth for HD video baseband (up to ~30MHz) with margin. |
| 2nd-Harmonic Distortion | –78dBc at 5MHz, RL ≥ 1kΩ - meets broadcast video differential gain/phase specs (0.04%/0.02°). |
| Output Current | ±120mA min - drives 100Ω loads to ±4VPP on ±5V supplies without clipping. |
| Quiescent Current | 1.7mA max at ±5V - enables battery-powered or thermally constrained designs. |
| Disable Current | <100µA - reduces system standby power by >94% vs active mode. |
| Input Voltage Noise | 3.7nV/√Hz typ - preserves SNR in high-gain ADC front-ends. |
| Enable Time | 40ns typ - supports fast channel switching in multichannel instrumentation. |
Pinout & Package
OPA684ID is packaged in SO-8 (D package), with exposed pad not electrically connected. Pin 1 is marked by a beveled corner or dot; device operates over –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connection | Internally unconnected; must remain floating or grounded per layout best practices. |
| 2 (Inverting Input) | Current-Sensing Node | Low 2.5Ω input resistance enables precise feedback current sensing; requires matched RF for stable CFB operation. |
| 3 (Noninverting Input) | Reference Input | 50kΩ || 2pF input impedance; sets common-mode bias point for DC-coupled configurations. |
| 4 (–VS) | Negative Supply Rail | Accepts –2.5V to –6V; internal biasing ensures stable operation across full supply range. |
| 5 (DIS) | Disable Control | Active-low TTL-compatible input; pulls supply current to <100µA when ≤1.5V. |
| 6 (+VS) | Positive Supply Rail | Accepts +2.5V to +6V or single +5V to +12V; PSRR >60dB minimizes supply noise coupling. |
| 7 (Output) | Voltage Output | Capable of ±4VPP into 100Ω; closed-loop output impedance is 6mΩ at 100kHz. |
| 8 (NC) | No Connection | Internally unconnected; no routing or termination required. |
Key Features
| Feature | Design Value |
|---|---|
| CFBplus Architecture | Internally buffered inverting input yields near-constant bandwidth from G = +1 to +20, eliminating gain-dependent compensation redesign. |
| Single +5V Operation | Supports rail-to-rail input swing (1.25V to 3.75V) and 3VPP output into 100Ω - enables compact portable video interfaces. |
| Low Distortion at High Frequency | –78dBc 2nd-harmonic at 5MHz ensures NTSC/PAL composite video fidelity without post-filtering. |
| Fast Enable/Disable | 40ns turn-on and 4ms turn-off allow dynamic power gating in time-multiplexed signal paths. |
| Thermal Robustness | θJA = 125°C/W (SO-8) enables operation at full spec in 70°C ambient without derating. |
Applications
| Low-Power Broadcast Video Drivers | ADC Input Drivers |
|---|---|
Use Scenario: Driving multiple 75Ω coaxial video lines from a single board in studio camera heads or portable recorders. IC Role / Device Role / Timing Role: Final-stage line driver with gain = +2, DC-coupled, providing differential gain/phase error <0.04%/0.02°. Use Value: Eliminates need for external current-boosting stages while maintaining broadcast-grade video integrity at <1.7mA per channel. | Use Scenario: Buffering high-speed analog inputs (e.g., 10-bit, 50MSPS) before SAR or pipeline ADCs in medical imaging front-ends. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain block with 3.7nV/√Hz input voltage noise and –78dBc harmonics at 5MHz. Use Value: Preserves ENOB by limiting added noise/distortion to <0.1 LSB at full-scale 2VPP input. |
| Equalizing Filters | Professional Cameras |
Use Scenario: Implementing passive peaking networks in SAW filter post-amplifiers to compensate for insertion loss roll-off above 20MHz. IC Role / Device Role / Timing Role: Stable CFB amplifier accepting frequency-selective feedback elements without oscillation risk. Use Value: Enables flat 0.1dB gain response to 19MHz at G = +2 - critical for wideband RF IF chain equalization. | Use Scenario: Signal conditioning in 4K UHD camera modules where thermal envelope limits total board power to <2W. IC Role / Device Role / Timing Role: Low-power video amplifier supporting dual-supply (±5V) or single-supply (+5V) operation with 120mA drive. Use Value: Delivers ±4VPP swing into 100Ω while consuming only 1.7mA - extends battery life without sacrificing dynamic range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA683ID | Lower quiescent current (1.3mA), reduced bandwidth (80MHz at G=+10), same SO-8 package. | Better suited for ultra-low-power battery systems where bandwidth <100MHz is acceptable. | Select OPA683ID when power budget is tighter than bandwidth requirement. |
| OPA691ID | Higher slew rate (1800 V/µs), higher supply current (5.3mA), same SO-8 footprint but different pinout (no DIS pin). | Required for >100MHz large-signal bandwidth (e.g., pulse amplification) where OPA684ID's 90MHz large-signal limit is insufficient. | Select OPA691ID when large-signal transient fidelity outweighs power efficiency. |
Compared with OPA683ID and OPA691ID, the OPA684ID uniquely balances sub-2mA quiescent current, 120MHz small-signal bandwidth, and integrated disable functionality - making it optimal for power-aware video and data-acquisition systems requiring rapid channel enable/disable.
Availability
OPA684ID is available at Aetrix Electronics and suitable for low-power broadcast video drivers, ADC input buffering, equalizing filters, and professional camera signal chains requiring stable component supply across industrial temperature ranges.
Supply support for OPA684ID 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions since 1930.
The OPA684ID belongs to TI's precision current-feedback op amp product line, engineered specifically for high-fidelity, low-power video, instrumentation, and communications signal conditioning where gain-stable bandwidth and low distortion are mandatory.
FAQ
What supply voltage ranges does the OPA684ID support?
The OPA684ID supports dual-supply operation from ±2.5V to ±6V and single-supply operation from +2.8V to +12V. At ±5V, it delivers full specified performance including 120MHz bandwidth at G = +10 and ±4VPP output swing into 100Ω. The internal biasing remains stable across this range, with minimal shift in quiescent current or distortion.
How does the DIS pin function on the OPA684ID?
The DIS pin on the OPA684ID is an active-low disable control. When pulled LOW (≤1.5V), it reduces supply current to <100µA and places all I/O pins in high-impedance state. When left open or held HIGH (≥3.4V), the amplifier operates normally. Enable time is 40ns and disable time is 4ms, enabling fast power gating in time-division multiplexed systems.
Can the OPA684ID drive a 75Ω video load directly?
Yes, the OPA684ID can drive a 75Ω video load directly. With ±5V supplies, it delivers ±4VPP into 100Ω and maintains >100mA sourcing/sinking capability. For 75Ω, output swing remains >±3.8VPP with <0.04% differential gain error and 0.02° phase error - meeting SMPTE 259M broadcast standards without external buffering.
What is the minimum recommended feedback resistor (RF) value for stable operation of the OPA684ID?
The minimum recommended RF value for stable, flat-frequency-response operation of the OPA684ID is 1kΩ in dual-supply configurations (±5V). At G = +2, this yields optimal 0.1dB gain flatness to 19MHz. Reducing RF below 1kΩ increases bandwidth but risks peaking; increasing RF degrades bandwidth and may reduce stability margin - both require re-evaluation via SPICE simulation.
Does the OPA684ID require external compensation for unity-gain stability?
No, the OPA684ID is internally compensated and stable at unity gain (G = +1). Its CFBplus architecture maintains 210MHz small-signal bandwidth at G = +1 with RF = 1kΩ and exhibits only 1.4dB peaking - well within acceptable limits for most video and instrumentation applications without added compensation components.
OPA684ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- 8-SOIC
OPA684ID FAQ
1.How can I place an order for OPA684ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA684ID 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 OPA684ID reliable?
The price and inventory of OPA684ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA684ID is usually 5 days.
3.What payment methods are accepted for OPA684ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA684ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA684ID?
OPA684ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA684ID 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 OPA684ID?
For technical support, including OPA684ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA684ID requirements.
6.How does Aetrix verify that OPA684ID is sourced from the original manufacturer or authorized distributors?
All OPA684ID 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 OPA684ID meets industry standards.
7.What is the process for return or replacement of OPA684ID?
All OPA684ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA684ID, 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 OPA684ID part is unused and in its original packaging.
Return procedure for OPA684ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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