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Texas Instruments OPA3684IDBQR
- Part No.:
- OPA3684IDBQR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
OPA3684IDBQR.pdf
- Description:
- IC OPAMP CFA 3 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,456
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Product details
Overview
OPA3684IDBQR from Texas Instruments is a triple-channel, low-power current-feedback operational amplifier with individual 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 professional camera video signal conditioning.
For engineers reviewing the OPA3684IDBQR datasheet, OPA3684IDBQR pinout, OPA3684IDBQR application, or OPA3684IDBQR equivalent, key selection considerations include its CFBPLUS architecture enabling stable bandwidth across gain (120MHz up to G = +10), low 1.7mA/ch quiescent current, ±4V output swing on ±5V supplies, and SSOP-16 package compatibility with high-density video routing layouts.
Technical Context
The OPA3684IDBQR implements a 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. Its transimpedance gain of 355kΩ (min) and 4.0Ω inverting-input resistance enable precise feedback control independent of external resistor variations.
This architecture decouples gain-setting elements (RG/RF) from bandwidth interaction, allowing frequency peaking networks and multichannel summing topologies without sacrificing stability. The device supports DC-coupled and AC-coupled configurations for both inverting (G = –1) and noninverting (G = +2) operation, with enable/disable timing of 40ns/4ms and 70dB off-isolation at 5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +2) | 170MHz typical - enables full HD video signal amplification with minimal phase lag |
| Harmonic Distortion (5MHz) | < –82dBc (2nd/3rd, RL ≥ 1kΩ) - preserves color fidelity in broadcast video paths |
| Output Current | ±120mA min - drives two 75Ω video loads or one 50Ω doubly-terminated cable |
| Supply Current | 1.7mA/ch max (±5V) - reduces thermal load in multi-channel video modules |
| Disable Current | < 100µA/ch - enables dynamic power gating in portable camera systems |
| Input Voltage Range | ±3.6V min (±5V supply) - supports rail-to-rail signal handling with 1.2V headroom |
| Small-Signal Rise Time | 3ns typical (G = +2, 0.5V step) - meets sub-10ns settling requirements for SDI pixel clocks |
Pinout & Package
OPA3684IDBQR is housed in a 16-pin SSOP (DBQ) package with 0.65mm pitch, 5.0mm × 6.2mm body size, and exposed pad for thermal dissipation. Pin 1 is marked by a dot; pins are numbered counterclockwise from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (DIS A) | Channel A disable control | Active-low logic input; open or HIGH enables channel A, LOW disables with high-Z I/O |
| 2 (DIS B) | Channel B disable control | Independent shutdown for channel B; enables selective power management |
| 3 (DIS C) | Channel C disable control | Per-channel disable allows dynamic channel allocation in multi-format video systems |
| 4 (+VS) | Positive supply rail | Accepts +2.8V to +12V (single) or +2.5V to +6V (dual); internal biasing ensures stable operation |
| 5 (+IN A) | Noninverting input, Channel A | 50kΩ || 1pF input impedance; sets common-mode reference for differential gain stages |
| 6 (–IN A) | Inverting input, Channel A | 4.5Ω input resistance (DC); low, linearized impedance critical for CFB stability |
| 7 (OUT A) | Output, Channel A | Capable of ±4V swing into 1kΩ; closed-loop output impedance 0.006Ω at 100kHz |
| 8 (NC) | No connect | Not bonded; must remain unconnected to avoid parasitic coupling |
| 9 (OUT C) | Output, Channel C | Electrically identical to OUT A; supports simultaneous RGB or YUV channel buffering |
| 10 (–IN C) | Inverting input, Channel C | Matches Channel A/B performance; enables matched triple-channel summing |
| 11 (+IN C) | Noninverting input, Channel C | Provides third independent gain path; supports tri-level sync or multi-format video processing |
| 12 (–VS) | Negative supply rail | Accepts –2.5V to –6V (dual); PSRR > 53dB ensures noise rejection from shared ground planes |
| 13 (+IN B) | Noninverting input, Channel B | Enables independent biasing per channel; supports differential I/O configurations (Fig. 5) |
| 14 (–IN B) | Inverting input, Channel B | Low 17pA/√Hz current noise - critical for low-noise analog front-end designs |
| 15 (OUT B) | Output, Channel B | 120mA sourcing/sinking - sufficient for driving 150Ω composite video loads |
| 16 (NC) | No connect | Unbonded; no internal connection; leave floating |
Key Features
| Feature | Design Value |
|---|---|
| CFBPLUS architecture | Internally buffered inverting input delivers near-constant bandwidth from G = +1 to +20 |
| Triple-channel integration | Single SSOP-16 package replaces three discrete op amps, reducing PCB area by >40% |
| Per-channel disable | Independent logic control per amplifier enables dynamic power scaling in battery-powered cameras |
| Video-optimized distortion | Differential gain/phase of 0.04%/0.02° (NTSC) meets SMPTE 253M broadcast standards |
| Wide supply flexibility | Operates from ±2.5V to ±6V or +2.8V to +12V - supports legacy and modern power architectures |
| High-speed enable timing | 40ns turn-on time allows burst-mode operation in time-division multiplexed video systems |
Applications
| RGB Line Drivers | Low-Power Broadcast Video Drivers |
|---|---|
|
Use Scenario: Driving red, green, and blue analog signals from graphics processor to display panel over 75Ω coaxial cables. IC Role / Device Role / Timing Role: Triple-channel voltage buffer with matched gain, phase, and settling across all channels to preserve color registration. Use Value: 170MHz bandwidth and < –82dBc distortion ensure accurate reproduction of 1080p60 pixel data without chroma smearing. |
Use Scenario: Amplifying composite NTSC/PAL video signals in portable field recorders with battery life constraints. IC Role / Device Role / Timing Role: Low-power current-feedback amplifier delivering 0.04% differential gain and 0.02° differential phase accuracy. Use Value: 1.7mA/ch quiescent current extends runtime while maintaining broadcast-grade video fidelity under thermal stress. |
| ADC Input Drivers | Professional Cameras |
|
Use Scenario: Conditioning sensor output before 12-bit+ ADC sampling in medical imaging or test equipment. IC Role / Device Role / Timing Role: High-output-current driver with 120mA sourcing capability and 3ns rise time to settle within 0.05% in <50ns. Use Value: Enables full-scale 5Vpp input to 12-bit ADCs without clipping or harmonic corruption at 10MHz bandwidth. |
Use Scenario: Signal conditioning in 4K cinema cameras requiring simultaneous RGB, sync, and metadata channel buffering. IC Role / Device Role / Timing Role: Triple-channel amplifier with per-channel disable supporting dynamic sensor mode switching (e.g., 4K vs slow-motion). Use Value: Independent DIS pins reduce system power by >85% during standby while preserving fast wake-up (<4ms). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2684IDR | Dual-channel version in SO-8; 170MHz bandwidth but no per-channel disable; 2.1mA/ch supply current | Lacks third channel and independent disable - suitable only for dual-path systems like Y/C separation | Select when board space permits SO-8 and triple-channel functionality is unnecessary |
| OPA3691IDBQR | Same SSOP-16 footprint; higher 350MHz bandwidth and 250mA output, but 4.5mA/ch supply current | Higher power consumption limits use in thermally constrained portable devices | Choose for ultra-high-resolution video where bandwidth >250MHz is required and power budget allows |
Compared with OPA3684IDBQR, the OPA2684IDR offers simpler dual-channel integration but sacrifices channel count and disable granularity, while the OPA3691IDBQR delivers superior speed and drive strength at the cost of 2.6× higher quiescent current-making OPA3684IDBQR optimal for balanced power-performance in triple-channel video systems.
Availability
OPA3684IDBQR 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 OPA3684IDBQR 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 over 50 years of innovation in precision amplifiers and signal chain solutions.
The OPA3684IDBQR belongs to TI's CFBPLUS current-feedback op amp product line, engineered specifically for high-fidelity, low-power video signal conditioning in professional broadcast, medical imaging, and test equipment applications.
FAQ
What supply voltage ranges does the OPA3684IDBQR support?
The OPA3684IDBQR 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 1.2V input headroom. These ranges are validated across –40°C to +85°C and enable compatibility with legacy and modern power architectures in video systems. The OPA3684IDBQR maintains stable bandwidth and distortion performance across this full voltage span due to internal supply-independent biasing.
How does the CFBPLUS architecture improve bandwidth stability versus conventional CFB op amps?
The OPA3684IDBQR's CFBPLUS architecture uses an internally closed-loop input buffer to linearize the inverting-input impedance, reducing sensitivity to gain-setting resistor variations. This yields <10% bandwidth change from G = +1 to +10 (vs >30% in earlier CFB designs), enabling consistent 120MHz bandwidth up to G = +10. The architecture also improves harmonic distortion by >15dB at 5MHz compared to standard CFB, directly supporting broadcast video compliance. The OPA3684IDBQR achieves this without increasing quiescent current beyond 1.7mA/ch.
Can the OPA3684IDBQR drive 50Ω doubly-terminated transmission lines?
Yes, the OPA3684IDBQR can drive > ±3Vp-p into 50Ω loads with < –82dBc distortion at 5MHz, meeting SMPTE 253M requirements for serial digital interface (SDI) ancillary data paths. Its 120mA output current and ±4V swing on ±5V supplies allow direct termination without external buffers. For optimal matching, use RF = 800Ω and RG values selected per gain; layout requires controlled 50Ω traces and ground plane integrity. The OPA3684IDBQR's 0.006Ω closed-loop output impedance at 100kHz minimizes reflection-induced ringing.
What is the function of the DIS pins on the OPA3684IDBQR?
The DIS A, DIS B, and DIS C pins on the OPA3684IDBQR provide independent active-low disable control for each of the three amplifier channels. When pulled LOW, a channel draws <100µA supply current and places its inputs/outputs in high-impedance state; open or HIGH enables normal operation. Enable/disable timing is 40ns/4ms, supporting burst-mode video processing. This per-channel control enables dynamic power management in multi-format cameras-e.g., disabling unused RGB channels during monochrome capture. The OPA3684IDBQR's DIS logic is compatible with 3.3V/5V CMOS levels.
How does the OPA3684IDBQR compare to the OPA3691IDBQR in video applications?
The OPA3684IDBQR and OPA3691IDBQR share the SSOP-16 DBQ package and triple-channel topology, but differ critically in power-performance trade-offs: OPA3684IDBQR delivers 170MHz bandwidth at 1.7mA/ch, while OPA3691IDBQR offers 350MHz at 4.5mA/ch. For 1080p60 RGB routing, OPA3684IDBQR's 170MHz and < –82dBc distortion meet requirements with 2.6× lower power. OPA3691IDBQR is reserved for 4K/60Hz or >10-bit ADC drivers where bandwidth >250MHz is mandatory. Both maintain identical pinout and disable functionality, enabling drop-in upgrades where thermal and power budgets allow.
OPA3684IDBQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 3
- Output Type:
- -
- Slew Rate:
- 780V/µs
- Gain Bandwidth Product:
- 120 MHz
- -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:
- 16-SSOP
OPA3684IDBQR FAQ
1.How can I place an order for OPA3684IDBQR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA3684IDBQR 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 OPA3684IDBQR reliable?
The price and inventory of OPA3684IDBQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA3684IDBQR is usually 5 days.
3.What payment methods are accepted for OPA3684IDBQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA3684IDBQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA3684IDBQR?
OPA3684IDBQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA3684IDBQR 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 OPA3684IDBQR?
For technical support, including OPA3684IDBQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA3684IDBQR requirements.
6.How does Aetrix verify that OPA3684IDBQR is sourced from the original manufacturer or authorized distributors?
All OPA3684IDBQR 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 OPA3684IDBQR meets industry standards.
7.What is the process for return or replacement of OPA3684IDBQR?
All OPA3684IDBQR units undergo pre-shipment inspection (PSI). If there is an issue with OPA3684IDBQR, 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 OPA3684IDBQR part is unused and in its original packaging.
Return procedure for OPA3684IDBQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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