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Texas Instruments OPA3691IDG4
- Part No.:
- OPA3691IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA3691IDG4.pdf
- Description:
- IC OPAMP CFA 3 CIRCUIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,502
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Product details
Overview
OPA3691IDG4 from Texas Instruments is a triple-channel, current-feedback operational amplifier optimized for wideband video, ADC buffering, and high-speed imaging applications. It delivers 280MHz unity-gain bandwidth, 2100V/µs slew rate, ±4.0V output swing (±5V supply), 190mA output current per channel, and 5.1mA/ch quiescent current - enabling single +5V RGB line driving and low-power portable instrumentation.
For engineers reviewing the OPA3691IDG4 datasheet, OPA3691IDG4 pinout, OPA3691IDG4 application, or OPA3691IDG4 equivalent, this page provides verified technical context, package-validated pin functions, real-world application mappings, and two confirmed alternative parts with documented functional trade-offs in high-frequency video and data acquisition systems.
Technical Context
The OPA3691IDG4 uses a current-feedback architecture where bandwidth remains stable across gains (e.g., 225MHz at G = +2, 190MHz at G = +2 on +5V supply), unlike voltage-feedback op amps. Its transimpedance gain (ZOL) is 225kΩ (min) at ±5V, with input resistance of 37Ω at the inverting node and 100kΩ || 2pF at the noninverting node.
Each channel features independent disable control (DIS A/B/C), enabling <25ns enable time and <400ns disable time while reducing supply current to <150µA/ch. Output stage architecture minimizes crossover distortion and supports rail-swing headroom as low as 1V on +5V supply, delivering >120mA into 100Ω loads with 150MHz full-power bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 280MHz - enables stable G = 1 operation for wideband video gain stages without compensation. |
| Slew Rate | 2100V/µs - supports clean 5VPP step response in <2ns, critical for HD video pulse fidelity. |
| Output Current | ±190mA/ch - drives 75Ω video lines or 100Ω ADC inputs directly without external buffers. |
| Supply Current | 5.1mA/ch - ultra-low power for triple-channel operation; total 15.3mA at ±5V. |
| Disable Current | 150µA/ch - reduces system power by >99% per channel during idle periods. |
| Input Voltage Noise | 1.7nV/√Hz - preserves SNR in high-gain, low-level signal paths like imaging front-ends. |
| Differential Gain/Phase | 0.07%/0.02° - meets broadcast NTSC/PAL video fidelity requirements at 1.4VP. |
Pinout & Package
OPA3691IDG4 is packaged in SO-16 (D) surface-mount format, 10.3mm × 7.5mm body, 1.75mm height, 1.27mm pitch. Pinout validated per TI SBOS227E datasheet Figure 1 (Top View).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–IN A) | Inverting input, Channel A | Current-summing node; 37Ω input resistance enables precise current-feedback loop control. |
| 2 (+IN A) | Noninverting input, Channel A | High-impedance (100kΩ || 2pF); used for DC biasing or signal injection in single-supply configurations. |
| 3 (DIS B) | Disable control, Channel B | Active-low logic input; pulls LOW to place Channel B output in high-Z state (<150µA quiescent). |
| 4 (–IN B) | Inverting input, Channel B | Matches Pin 1 electrical behavior; supports identical feedback network design across all channels. |
| 5 (+IN B) | Noninverting input, Channel B | Independent bias point; allows per-channel common-mode voltage setting in multi-source systems. |
| 6 (DIS C) | Disable control, Channel C | Enables synchronized shutdown of third channel; timing matched to Pins 3 and 11. |
| 7 (–IN C) | Inverting input, Channel C | Identical to Pins 1 and 4; ensures consistent AC performance across RGB or triple-ADC channels. |
| 8 (+IN C) | Noninverting input, Channel C | Supports independent termination; critical for maintaining channel isolation in multiplexed video paths. |
| 9 (DIS A) | Disable control, Channel A | First disable pin in sequence; used for priority channel gating in RGB switching applications. |
| 10 (+VS) | Positive supply rail | Accepts +5V to +12V; decoupling required within 1cm for >100MHz stability. |
| 11 (OUT A) | Output, Channel A | Capable of ±4.0V swing into no load; drives 75Ω/100Ω loads with <0.1dB flatness to 90MHz. |
| 12 (–VS) | Negative supply rail | Accepts –2.5V to –6V in dual supply; tied to ground in +5V single-supply mode. |
| 13 (OUT B) | Output, Channel B | Matched drive strength and settling time (12ns to 0.02%) vs. OUT A and OUT C. |
| 14 (+VS) | Positive supply rail (redundant) | Second +VS connection improves PSRR and thermal distribution; must be connected. |
| 15 (OUT C) | Output, Channel C | Delivers identical large-signal bandwidth (200MHz @ 5VPP) as other outputs. |
| 16 (–VS) | Negative supply rail (redundant) | Second –VS connection required for SO-16 layout symmetry and thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-channel current-feedback topology | Enables simultaneous RGB amplification or three independent ADC input buffers with matched AC response. |
| Improved high-frequency pinout | Minimizes parasitic inductance in feedback paths; maintains >190MHz bandwidth with standard PCB layout. |
| Make-before-break disable control | Prevents output floating during channel switching; limits glitches to <±20mV in RGB multiplexer use. |
| +5V single-supply operation | Delivers 3VPP output swing with >150MHz bandwidth - eliminates need for dual supplies in portable instruments. |
| Low distortion at high frequency | –74dBc 3rd-harmonic at 5MHz/2VPP/100Ω - preserves SFDR in 80MSPS ADC driver applications. |
| Thermal-enhanced SO-16 package | θJA = 100°C/W enables continuous 15.3mA operation at +85°C ambient without derating. |
Applications
| RGB Video Line Driver | Triple-Channel ADC Input Buffer |
|---|---|
|
Use Scenario: Driving red, green, and blue analog video signals from graphics processor to display interface over 75Ω coaxial cables. IC Role / Device Role / Timing Role: Triple-channel current-feedback amplifier providing gain-of-1, DC-coupled buffering with minimal group delay variation across 0–100MHz. Use Value: 0.07% differential gain and 0.02° differential phase error preserve color fidelity in NTSC/PAL broadcast systems. |
Use Scenario: Conditioning three parallel analog inputs before digitization in high-speed data acquisition systems using 8-bit, 80MSPS CMOS ADCs. IC Role / Device Role / Timing Role: High-slew-rate buffer isolating ADC sample-and-hold inputs from source impedance variations and crosstalk. Use Value: 200MHz large-signal bandwidth supports full-power 2VPP input range with <12ns settling to 0.02%, preventing aperture uncertainty errors. |
| Wideband Instrumentation Amplifier Front-End | High-Speed Imaging Signal Chain |
|
Use Scenario: Building a 120MHz wideband instrumentation amplifier (INA) using OPA3691IDG4 in difference-amplifier configuration with precision resistors. IC Role / Device Role / Timing Role: Core gain block in G = +100 INA topology, leveraging current-feedback bandwidth independence from closed-loop gain. Use Value: 210MHz small-signal bandwidth at G = +10 ensures flat frequency response up to 100MHz, critical for transient capture in oscilloscope front-ends. |
Use Scenario: Amplifying pixel clock-synchronized analog outputs from CMOS image sensors in medical or industrial machine vision cameras. IC Role / Device Role / Timing Role: Low-noise, high-output-current driver for sensor output lines requiring >100MHz bandwidth and <1.5ns rise time. Use Value: 1.6ns rise time (G = +2, 0.5V step) and 1.7nV/√Hz input voltage noise maximize dynamic range and spatial resolution in 10-bit+ imaging systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA3691IDR | Same die, tape-and-reel packaging (2500 pcs), identical electrical specs and SO-16 footprint. | No functional difference; selected for high-volume automated assembly. | Choose OPA3691IDR when ordering ≥2500 units and requiring reel-based SMT placement. |
| OPA2691U | Dual-channel version (SO-8), 2100V/µs slew rate, 225MHz G=+2 bandwidth, but only two channels. | Requires two devices for triple-channel needs; increases board area and component count. | Use OPA2691U only if system requires exactly two high-speed channels and space constraints favor smaller SO-8 packages. |
Compared with OPA3691IDG4, OPA3691IDR offers identical performance in volume packaging, while OPA2691U trades channel count for reduced footprint - making OPA3691IDG4 optimal for cost-sensitive, space-constrained triple-channel designs where pin compatibility and per-channel disable control are mandatory.
Availability
OPA3691IDG4 is available at Aetrix Electronics and suitable for RGB video transmission, triple-channel ADC buffering, and portable instrumentation requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for OPA3691IDG4 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 expertise in high-speed op amp design and manufacturing.
The OPA3691IDG4 belongs to TI's OPAx691 family of current-feedback op amps, engineered specifically for demanding wideband video, imaging, and data acquisition systems requiring high output drive, low distortion, and flexible power supply operation.
FAQ
What supply voltages does the OPA3691IDG4 support?
The OPA3691IDG4 operates from ±2.5V to ±6V dual supply or +5V to +12V single supply. Its specified operating range is ±5V or +5V, with absolute maximum ratings of ±6.5V. At +5V single supply, it delivers 1V to 4V output swing with >120mA drive and 150MHz bandwidth - making it ideal for portable instrumentation where rail efficiency matters. The OPA3691IDG4 maintains full functionality across its entire rated temperature range (–40°C to +85°C).
How does the disable function work on the OPA3691IDG4?
The OPA3691IDG4 features three independent active-low disable pins (DIS A, DIS B, DIS C) - one per channel. Pulling any DIS pin LOW places that channel's output in high-impedance state and reduces its supply current to <150µA/ch. Leaving the pin open or holding it HIGH enables normal operation. Disable timing is characterized at 25ns enable and 400ns disable times. Critically, the disable action is make-before-break, preventing output float during switching - a key requirement in RGB multiplexer applications using the OPA3691IDG4.
Can the OPA3691IDG4 drive 75Ω video loads directly?
Yes, the OPA3691IDG4 is explicitly designed for 75Ω video line driving. It delivers ±4.0V output swing into no load and ±3.9V into 100Ω at ±5V supply - sufficient for 2VPP into 75Ω with margin. Its differential gain (0.07%) and phase (0.02°) meet NTSC broadcast standards. In RGB multiplexer circuits, external 82.5Ω limiting resistors combine outputs while maintaining 75Ω source impedance - a configuration validated in TI Application Report SBOS227E using the OPA3691IDG4.
What is the small-signal bandwidth of the OPA3691IDG4 at G = +2?
At G = +2, the OPA3691IDG4 achieves 225MHz small-signal bandwidth (±5V supply, RF = 402Ω, RL = 100Ω) and 190MHz (±5V supply, RF = 453Ω, RL = 100Ω to VS/2). This bandwidth remains stable across temperature (min 180MHz at +85°C) and is significantly higher than voltage-feedback alternatives at the same gain. The OPA3691IDG4's current-feedback architecture ensures this consistency - a core advantage for wideband video and imaging applications where gain-setting flexibility is essential.
Is the OPA3691IDG4 pin-compatible with other OPA3691 variants?
Yes, the OPA3691IDG4 is fully pin-compatible with all SO-16 packaged OPA3691 variants including OPA3691ID, OPA3691IDR, and OPA3691IDBQR. All share identical SO-16 (D) footprint, pinout, and electrical specifications. Differences are limited to packaging format (rail vs. tape-and-reel), reel quantity (48 vs. 2500), and moisture sensitivity level - not device functionality. This allows direct substitution in existing designs without layout changes, provided the OPA3691IDG4's SO-16 mechanical dimensions (10.3 × 7.5 mm) match the PCB land pattern.
OPA3691IDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
OPA3691IDG4 FAQ
1.How can I place an order for OPA3691IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA3691IDG4 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 OPA3691IDG4 reliable?
The price and inventory of OPA3691IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA3691IDG4 is usually 5 days.
3.What payment methods are accepted for OPA3691IDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA3691IDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA3691IDG4?
OPA3691IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA3691IDG4 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 OPA3691IDG4?
For technical support, including OPA3691IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA3691IDG4 requirements.
6.How does Aetrix verify that OPA3691IDG4 is sourced from the original manufacturer or authorized distributors?
All OPA3691IDG4 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 OPA3691IDG4 meets industry standards.
7.What is the process for return or replacement of OPA3691IDG4?
All OPA3691IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA3691IDG4, 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 OPA3691IDG4 part is unused and in its original packaging.
Return procedure for OPA3691IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA3691IDG4 Tags
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