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Texas Instruments OPA2684ID
- Part No.:
- OPA2684ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2684ID.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:176
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Product details
Overview
OPA2684ID from Texas Instruments is a dual, low-power, current-feedback operational amplifier optimized for high-speed video and broadband signal conditioning. It delivers 170MHz bandwidth at G = +2, –82dBc 2nd-harmonic distortion at 5MHz (RL ≥ 1kΩ), and ±120mA output current on ±5V supplies - enabling use in professional broadcast video drivers and ADC input stages.
For engineers reviewing the OPA2684ID datasheet, OPA2684ID pinout, OPA2684ID application, or OPA2684ID equivalent, key selection criteria include its CFBPLUS architecture's gain-independent bandwidth, 3.4mA total quiescent current, SO-8 package thermal resistance (125°C/W), and differential distortion performance in NTSC composite video systems.
Technical Context
The OPA2684ID employs a CFBPLUS architecture with an internally closed-loop input buffer stage that linearizes inverting-input impedance, enabling stable >120MHz bandwidth up to G = +10 and minimizing harmonic distortion across gain settings. Its transimpedance gain is 355kΩ (min), and inverting input resistance is 4.0Ω (typ).
This dual-channel amplifier supports both bipolar (±2.5V to ±6V) and single-supply (+2.8V to +12V) operation, with input common-mode range extending to ±3.6V on ±5V supplies and output swing of ±3.8V into 1kΩ. Channel-to-channel isolation is 70dB at 5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +2) | 170MHz min - enables full NTSC/PAL video bandwidth with headroom for equalization. |
| Harmonic Distortion (5MHz) | –82dBc 2nd-harmonic (RL ≥ 1kΩ) - meets broadcast video differential gain/phase specs (0.04%/0.02°). |
| Output Current | ±120mA min sourcing/sinking - drives 50Ω doubly-terminated lines or multiple 150Ω video loads. |
| Supply Current | 3.4mA total (±5V) - supports portable and thermally constrained multi-channel designs. |
| Input Voltage Noise | 3.7nV/√Hz typ - preserves SNR in ADC front-end and low-level signal amplification. |
| Small-Signal Rise Time | 3ns typ (G = +2, 0.5V step) - ensures sub-10ns settling for high-resolution imaging timing paths. |
| CMRR | 60dB min (±5V) - maintains rejection of common-mode interference in differential signaling chains. |
Pinout & Package
OPA2684ID is housed in an SO-8 (D) package with exposed pad not electrically connected. The 8-pin surface-mount outline measures 4.9mm × 3.9mm × 1.75mm (max height), rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (+In A) | Noninverting input, Channel A | High-impedance node (50kΩ || 2pF); bias current ±5µA max - sets DC operating point for noninverting configurations. |
| 2 (–In A) | Inverting input, Channel A | Low-impedance current-sensing node (4.0Ω typ); critical for feedback stability and bandwidth control via RF. |
| 3 (Out A) | Output, Channel A | Capable of ±4.1V swing into 1kΩ; drives 50Ω loads with >±3Vp-p - suitable for video line driving without external buffers. |
| 4 (–VS) | Negative supply rail | Accepts –2.5V to –6.0V; must be decoupled with 0.1µF ceramic near pin - defines lower rail for bipolar operation. |
| 5 (+VS) | Positive supply rail | Accepts +2.5V to +6.0V; supports single +5V operation when –VS tied to ground - enables flexible power architecture. |
| 6 (+In B) | Noninverting input, Channel B | Independent high-Z input identical to Pin 1 - allows dual-path signal processing or differential I/O configurations. |
| 7 (–In B) | Inverting input, Channel B | Identical low-Z current-sense node to Pin 2 - permits independent gain setting per channel with matched RF. |
| 8 (Out B) | Output, Channel B | Electrically isolated from Out A; channel-to-channel isolation 70dB at 5MHz - prevents crosstalk in multichannel summing or stereo video. |
Key Features
| Feature | Design Value |
|---|---|
| CFBPLUS architecture | Internally buffered inverting input yields linearized 4.0Ω impedance - eliminates gain-dependent bandwidth roll-off seen in legacy CFB op amps. |
| Gain-independent bandwidth | Maintains >120MHz bandwidth from G = +2 to G = +10 - simplifies filter design and avoids re-optimization across gain settings. |
| Low-distortion video drive | Differential gain 0.04% / phase 0.02° (NTSC) - meets SMPTE 253M and ITU-R BT.601 broadcast standards without external correction. |
| Single-supply compatibility | Operates from +2.8V to +12V with 1.25V input headroom and 1.0V output headroom - supports +3.3V and +5V embedded systems. |
| Thermal robustness | θJA = 125°C/W (SO-8) with internal trim of quiescent current - ensures stable 3.4mA total supply current over –40°C to +85°C. |
Applications
| Professional Broadcast Video Drivers | ADC Input Drivers |
|---|---|
Use Scenario: Driving 50Ω coaxial cables in studio camera signal chains with minimal group delay variation. IC Role / Device Role / Timing Role: Final-stage voltage buffer and level shifter delivering ±3Vp-p into 50Ω loads while preserving rise time & differential phase. Use Value: 3ns rise time and 0.02° differential phase error eliminate visible color fringing in HD-SDI transmission paths. |
Use Scenario: Conditioning analog sensor outputs prior to sampling by 12-bit+ SAR or pipeline ADCs. IC Role / Device Role / Timing Role: Low-noise, fast-settling gain block with 3.7nV/√Hz input noise and 0.05% settling in 60ns. Use Value: Enables full ENOB preservation in 10MSPS data acquisition systems without degrading SNR below 70dB. |
| Differential Equalizing Filters | Multichannel Summing Amplifiers |
Use Scenario: Compensating frequency droop in long HDMI or DisplayPort interconnects using peaking networks at the inverting input. IC Role / Device Role / Timing Role: Current-feedback amplifier allowing reactive elements in RF path without destabilizing gain-bandwidth tradeoff. Use Value: Stable operation with added LC peaking up to 100MHz - extends usable cable length by 3× vs voltage-feedback alternatives. |
Use Scenario: Combining four analog video channels into a single composite stream with matched gain and phase. IC Role / Device Role / Timing Role: Dual-channel inverting summing node with 70dB channel isolation and <3ns inter-channel skew. Use Value: Prevents ghosting and luminance crosstalk in quad-split surveillance displays operating at 1080p60. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2683ID | Lower quiescent current (2.6mA total), reduced bandwidth (145MHz at G=+2), same SO-8 package. | Better suited for battery-powered portable video equipment where power budget is tighter than bandwidth. | Select OPA2683ID when system thermal envelope limits total dissipation to <150mW at +85°C. |
| OPA2691ID | Higher output current (±250mA), higher supply current (6.5mA total), same gain-bandwidth profile. | Required for driving 75Ω broadcast infrastructure or active backplanes with >100mA peak load demands. | Choose OPA2691ID when driving doubly-terminated 75Ω lines or sustaining >±4Vp-p into 50Ω under heavy capacitive load. |
Compared with OPA2683ID and OPA2691ID, the OPA2684ID uniquely balances 170MHz bandwidth, ±120mA drive, and 3.4mA total supply current in SO-8 - making it optimal for space-constrained, thermally sensitive dual-channel video routing where neither ultra-low power nor extreme output current is required.
Availability
OPA2684ID is available at Aetrix Electronics and suitable for professional broadcast video drivers, ADC input conditioning, and differential equalizing filters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2684ID 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, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and communications markets.
The OPA2684ID belongs to TI's high-speed precision op amp product line, engineered specifically for low-power, wideband current-feedback applications in broadcast video, test equipment, and high-fidelity data acquisition systems.
FAQ
What is the maximum small-signal bandwidth of the OPA2684ID at G = +2?
The OPA2684ID achieves a minimum small-signal bandwidth of 170MHz at G = +2 with RF = 800Ω and RL = 100Ω under ±5V supply conditions. This specification is tested and guaranteed over temperature (–40°C to +85°C) and represents the –3dB point for 0.5Vp-p output signals. Bandwidth remains >120MHz even at G = +10, confirming its gain-flat CFBPLUS architecture.
Can the OPA2684ID operate from a single +5V supply?
Yes, the OPA2684ID supports single +5V operation with specified performance: 110MHz minimum bandwidth (G = +2, RF = 1kΩ), 380V/µs minimum slew rate, and 0.9V to 4.1V output swing into 1kΩ. Input common-mode range spans 1.25V to 3.75V, requiring external biasing (e.g., resistive divider) for AC-coupled inputs - as shown in Figure 3 of the SBOS239D datasheet.
What is the inverting input resistance of the OPA2684ID and why does it matter?
The OPA2684ID has a typical inverting input resistance of 4.0Ω under open-loop DC conditions. This low, well-defined impedance is fundamental to current-feedback operation: it establishes the transimpedance gain (ZOL = 355kΩ min) and makes bandwidth directly dependent on feedback resistor value (RF), not gain-setting resistor (RG). Stability and bandwidth predictability rely on maintaining RF near 800Ω for bipolar supplies.
How does the OPA2684ID compare to the OPA2683ID in terms of video performance?
The OPA2684ID provides superior video performance versus the OPA2683ID: 170MHz vs 145MHz bandwidth at G = +2, –82dBc vs –78dBc 2nd-harmonic distortion (5MHz, RL ≥ 1kΩ), and 0.04%/0.02° vs 0.05%/0.03° differential gain/phase. These differences enable the OPA2684ID to meet stricter broadcast standards (e.g., SMPTE RP 168) in high-density multichannel video routers where channel count and fidelity are both critical.
Is the OPA2684ID pin-compatible with other dual CFB amplifiers in SO-8 packages?
No, the OPA2684ID is not pin-compatible with standard dual op amps (e.g., OPA2691ID or LMH6702) due to its unique current-feedback topology and dedicated inverting-input architecture. While all share SO-8 footprints, pin functions differ: OPA2684ID assigns Pins 2 and 7 exclusively as low-impedance current-sense nodes, whereas voltage-feedback devices use those pins as high-Z inputs. PCB layout must follow TI's recommended grounding and decoupling for CFB stability.
OPA2684ID 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:
- 2
- Output Type:
- Differential
- 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 (x2 Channels)
- 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:
- 8-SOIC
OPA2684ID FAQ
1.How can I place an order for OPA2684ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2684ID 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 OPA2684ID reliable?
The price and inventory of OPA2684ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2684ID is usually 5 days.
3.What payment methods are accepted for OPA2684ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2684ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2684ID?
OPA2684ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2684ID 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 OPA2684ID?
For technical support, including OPA2684ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2684ID requirements.
6.How does Aetrix verify that OPA2684ID is sourced from the original manufacturer or authorized distributors?
All OPA2684ID 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 OPA2684ID meets industry standards.
7.What is the process for return or replacement of OPA2684ID?
All OPA2684ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA2684ID, 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 OPA2684ID part is unused and in its original packaging.
Return procedure for OPA2684ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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