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Texas Instruments OPA3691ID
- Part No.:
- OPA3691ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA3691ID.pdf
- Description:
- IC OPAMP CFA 3 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,889
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Product details
Overview
OPA3691ID from Texas Instruments is a triple-channel, current-feedback operational amplifier optimized for wideband video and high-speed data acquisition. It delivers 280MHz unity-gain bandwidth, 2100V/µs slew rate, ±4.0V output swing (±5V supply), 190mA output current per channel, and integrated disable control enabling <150µA/ch power-down mode - making it ideal for RGB line drivers and single-supply ADC input buffering in portable instrumentation.
For engineers reviewing the OPA3691ID datasheet, OPA3691ID pinout, OPA3691ID application, or OPA3691ID equivalent, key selection criteria include its current-feedback architecture's gain-independent bandwidth, low 5.1mA/ch quiescent current with precise 25°C trim, high-frequency pinout optimization for reduced crosstalk, and verified performance at +5V single-supply operation with 190MHz G=+2 bandwidth.
Technical Context
The OPA3691ID employs a current-feedback topology with transimpedance gain (ZOL) of 225kΩ (min, ±5V), enabling stable high-frequency operation independent of closed-loop gain. Its output stage architecture minimizes voltage headroom and crossover distortion, supporting ±4.0V swing into no load and >120mA drive at ±3.9V into 100Ω on ±5V supplies.
Each channel features an independent disable (DIS) pin that, when pulled LOW, reduces supply current to <150µA/ch while placing the output in high-impedance state; enable/disable times are 25ns and 400ns respectively, with turn-on/off glitches limited to ±50mV and ±20mV under specified conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +1) | 280MHz - enables full-power signal fidelity up to NTSC/PAL video baseband without gain-dependent roll-off. |
| Slew Rate | 2100V/µs - supports clean 5VPP step response in <2ns with minimal overshoot for imaging and pulse applications. |
| Output Current | ±190mA/ch - drives 75Ω video cables, 100Ω ADC inputs, or multiple parallel loads without external buffers. |
| Supply Range | ±2.5V to ±6V dual or +5V to +12V single - allows direct integration into legacy ±5V systems or modern low-voltage portable designs. |
| Disable Current | <150µA/ch - reduces total system standby power by >97% versus active mode (15.3mA), critical for battery-powered instruments. |
| Input Voltage Noise | 1.7nV/√Hz @ >1MHz - preserves SNR in high-bandwidth signal chains such as cable drivers and active filters. |
| Differential Gain/Phase | 0.07%/0.02° @ NTSC - meets broadcast-grade video linearity requirements without post-compensation. |
Pinout & Package
OPA3691ID is packaged in SO-16 surface-mount (D package), 16-pin small-outline integrated circuit with exposed pad thermal enhancement. Pin numbering follows standard SOIC top-view convention with pin 1 marked by notch or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9 | –IN A/B/C | Inverting inputs for channels A, B, C - high-impedance current-summing nodes with 37Ω internal resistance. |
| 2, 6, 10 | +IN A/B/C | Noninverting inputs - 100kΩ || 2pF impedance; common-mode range extends to ±3.5V on ±5V supply. |
| 3, 7, 11 | DIS A/B/C | Active-low disable control per channel - logic HIGH enables; LOW disables output and reduces supply current. |
| 4, 12 | +VS / –VS | Positive/negative supply pins - decoupling required; θJA = 100°C/W for thermal management. |
| 8, 13, 16 | OUT A/B/C | High-current outputs - capable of ±190mA sourcing/sinking; output impedance <0.03Ω at 100kHz. |
| 14, 15 | No Connect | Internally unused - must be left floating or grounded per layout best practices to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable current-feedback architecture | Eliminates gain-bandwidth trade-off: 225MHz bandwidth retained at G=+5 and G=+10 configurations. |
| Improved high-frequency pinout | Minimizes inter-channel crosstalk (<–80dBc at 5MHz) and maintains signal integrity in triple-channel video routing. |
| Single +5V operation with 190MHz bandwidth | Enables direct interface with 3.3V/5V microcontrollers and ADCs without level-shifting or dual supplies. |
| Make-before-break disable timing | Prevents output float during channel switching in RGB multiplexers; ensures continuous signal path control. |
| Low-distortion output stage | Delivers –74dBc 3rd-harmonic at 5MHz/2VPP, meeting SFDR requirements for 8-bit+ ADC drivers. |
Applications
| RGB Amplifiers | ADC Buffers |
|---|---|
|
Use Scenario: Driving red, green, and blue analog video signals from graphics processors to 75Ω coaxial distribution lines in monitors or projectors. IC Role / Device Role / Timing Role: Triple-channel current-feedback op amp providing simultaneous gain, DC restoration, and cable drive with matched phase response. Use Value: 0.07% differential gain and 0.02° differential phase error preserve color fidelity across NTSC/PAL bandwidth without external calibration. |
Use Scenario: Conditioning analog inputs for high-speed CMOS pipelined ADCs (e.g., ADS831) in digitizers and oscilloscopes. IC Role / Device Role / Timing Role: Single-supply, wideband buffer delivering 3VPP swing with >150MHz full-power bandwidth into 100Ω ADC front-end. Use Value: Harmonic distortion does not degrade ADC SFDR; enables 8-bit+ resolution at 80MSPS without additional filtering. |
| High-Speed Imaging Channels | Cable Drivers |
|
Use Scenario: Transmitting pixel clock-synchronized analog image data from CMOS/CCD sensors over 1–3m coaxial cables in medical endoscopes or industrial cameras. IC Role / Device Role / Timing Role: Low-glitch, fast-settling driver (12ns to 0.02%) preserving edge timing and minimizing jitter-induced sampling errors. Use Value: 2100V/µs slew rate and 200MHz large-signal bandwidth ensure sub-pixel timing accuracy for >10MP sensors. |
Use Scenario: Driving long 50Ω/75Ω transmission lines in test equipment, broadcast gear, and automated test systems. IC Role / Device Role / Timing Role: High-output-current amplifier compensating for line loss while maintaining impedance match and return loss >20dB. Use Value: ±190mA output current sustains >1VPP signal amplitude at far end of 10m RG-59 cable at 100MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-channel wideband amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA3691IDBQT | Same die, SSOP-16 (DBQ) package with tape-and-reel packaging (250 units); identical electrical specs and pinout. | Preferred for automated SMT assembly; same thermal resistance (θJA = 100°C/W) but smaller footprint. | Select OPA3691IDBQT for volume production requiring pick-and-place compatibility and space-constrained PCBs. |
| OPA3690ID | Voltage-feedback architecture; lower bandwidth (250MHz G=+1), higher supply current (6.5mA/ch), no disable function. | Lacks power-down capability and exhibits gain-dependent bandwidth; unsuitable for battery-powered or multi-channel switching systems. | Choose OPA3690ID only if voltage-feedback linearity advantages outweigh need for disable control and current-feedback bandwidth stability. |
Compared with OPA3691IDBQT, the OPA3691ID offers identical performance in SO-16 packaging for manual prototyping or through-hole-compatible reflow; compared with OPA3690ID, it provides 30MHz higher unity-gain bandwidth, 1.4mA/ch lower quiescent current, and integrated channel disable - essential for portable and power-aware designs.
Availability
OPA3691ID is available at Aetrix Electronics and suitable for RGB amplifiers, high-speed ADC buffering, and cable driver applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and medical electronics.
Supply support for OPA3691ID 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 OPA3691ID belongs to TI's OPAx691 family of current-feedback amplifiers, engineered specifically for wideband video, imaging, and data acquisition systems demanding high output current, low distortion, and single-supply operability.
FAQ
What supply voltages does the OPA3691ID support?
The OPA3691ID operates from ±2.5V to ±6V dual supply or +5V to +12V single supply. Its specified operating range is ±5V or +5V, with maximum ratings up to ±6.5V. At +5V single supply, it delivers 190MHz bandwidth (G=+2) and 3VPP output swing centered at 2.5V - validated in TI's SBOS227E datasheet Figure 2 test circuit.
How does the disable function work on the OPA3691ID?
The OPA3691ID has three independent DIS pins (pins 3, 7, 11). Pulling any DIS pin LOW disables its corresponding amplifier channel, reducing supply current to <150µA/ch and placing the output in high-impedance state. The feature uses make-before-break timing to prevent output float during switching - critical for RGB multiplexing. Enable/disable times are 25ns and 400ns respectively.
Can the OPA3691ID drive 75Ω video cables directly?
Yes - the OPA3691ID delivers ±190mA output current and supports 75Ω loads with minimal distortion. In RGB multiplexer applications (TI Figure 4), it drives 75Ω lines using 82.5Ω series output resistors to achieve matched 75Ω source impedance and +1 gain. Differential gain/phase of 0.07%/0.02° at NTSC confirms broadcast-grade video fidelity without external equalization.
What is the thermal performance of the OPA3691ID in SO-16 package?
The OPA3691ID in SO-16 (D package) has a junction-to-ambient thermal resistance (θJA) of 100°C/W, per TI SBOS227E datasheet. With 15.3mA total quiescent current at ±5V, power dissipation is ~153mW - resulting in ~15°C junction rise above ambient at steady state. Layout with copper pour under the exposed pad (if present) or thermal vias improves heat transfer in high-density designs.
Is the OPA3691ID suitable for driving ADC inputs in single-supply systems?
Yes - the OPA3691ID is explicitly characterized for single +5V ADC driving (TI Figure 3). It delivers >150MHz full-power bandwidth with 3VPP output swing into 100Ω, matching typical 2VPP input ranges of CMOS pipelined ADCs like the ADS831. Its low 1.7nV/√Hz input voltage noise and –74dBc 3rd-harmonic distortion ensure no degradation of ADC SFDR performance.
OPA3691ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 3
- Output Type:
- -
- Slew Rate:
- 2100V/µs
- Gain Bandwidth Product:
- 2 GHz
- -3db Bandwidth:
- 280 MHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 800 µV
- Current - Supply:
- 15.3mA
- Current - Output / Channel:
- 190 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:
- 16-SOIC
OPA3691ID FAQ
1.How can I place an order for OPA3691ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA3691ID 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 OPA3691ID reliable?
The price and inventory of OPA3691ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA3691ID is usually 5 days.
3.What payment methods are accepted for OPA3691ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA3691ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA3691ID?
OPA3691ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA3691ID 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 OPA3691ID?
For technical support, including OPA3691ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA3691ID requirements.
6.How does Aetrix verify that OPA3691ID is sourced from the original manufacturer or authorized distributors?
All OPA3691ID 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 OPA3691ID meets industry standards.
7.What is the process for return or replacement of OPA3691ID?
All OPA3691ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA3691ID, 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 OPA3691ID part is unused and in its original packaging.
Return procedure for OPA3691ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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