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Texas Instruments OPA3691IDBQT
- Part No.:
- OPA3691IDBQT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
OPA3691IDBQT.pdf
- Description:
- IC OPAMP CFA 3 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:421
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Product details
Overview
OPA3691IDBQT from Texas Instruments is a triple-channel, current-feedback operational amplifier optimized for wideband video and high-speed analog signal conditioning. It delivers 280MHz unity-gain bandwidth, 2100V/µs slew rate, ±4.0V output swing (±5V supply), and 190mA output current per channel - enabling RGB line driving, ADC buffering, and broadband video applications with single +5V or dual ±5V operation.
For engineers reviewing the OPA3691IDBQT datasheet, OPA3691IDBQT pinout, OPA3691IDBQT application, or OPA3691IDBQT equivalent, key selection criteria include its current-feedback architecture (gain-independent bandwidth), low 5.1mA/ch quiescent current, integrated disable control (150µA/ch shutdown), and SSOP-16 package compatibility with high-density video routing layouts.
Technical Context
The OPA3691IDBQT employs a current-feedback topology where bandwidth remains stable across gains (e.g., 280MHz at G = +1, 190MHz at G = +2 on +5V supply), unlike voltage-feedback amplifiers. Its transimpedance gain (ZOL) is 225kΩ (min) at ±5V, with input bias currents of ±5µA (inverting) and +15µA (noninverting) at 25°C.
It features an improved high-frequency pinout to minimize parasitic coupling, a make-before-break disable function (25ns enable time, 400ns disable time), and rail-swing capability: on +5V supply, it delivers 1V–4V output (1.5V headroom) while sourcing/sinking ≥120mA into 100Ω loads at 150MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +1) | 280MHz - supports full HD video signal integrity without gain-dependent roll-off |
| Slew Rate | 2100V/µs - enables clean 5VPP pulse response in <2ns with minimal distortion |
| Output Current | ±190mA/ch - drives 75Ω video lines or multiple ADC inputs simultaneously |
| Supply Current | 5.1mA/ch - total 15.3mA for all three channels at ±5V, enabling portable instrumentation |
| Disable Current | 150µA/ch - reduces system power by >99% during idle periods without external circuitry |
| Input Voltage Noise | 1.7nV/√Hz - preserves SNR in precision ADC front-ends up to 100MHz |
| Differential Gain/Phase | 0.07%/0.02° - meets NTSC/PAL broadcast video fidelity requirements |
Pinout & Package
OPA3691IDBQT is packaged in a 16-pin SSOP (DBQ) with 0.65mm pitch, optimized for high-frequency layout and thermal dissipation (θJA = 100°C/W). Pin functions are validated per TI SBOS227E datasheet Figure 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 4, 7 (–IN A/B/C) | Inverting input (per channel) | Current-summing node for feedback network; requires matched impedance (e.g., 402Ω) for stable G = +2 |
| 2, 5, 8 (+IN A/B/C) | Noninverting input (per channel) | High-impedance input (100kΩ || 2pF); used for DC biasing or signal injection in single-supply configs |
| 3, 6, 9 (DIS A/B/C) | Channel disable control | Active-low logic: <1.5V disables channel (output Hi-Z, 150µA/ch), >3.3V enables normal operation |
| 10, 14 (+VS) | Positive supply rail | Accepts +5V to +12V single or ±2.5V to ±6V dual; decoupling required (0.1µF + 6.8µF) |
| 12, 16 (–VS) | Negative supply rail | Required for dual supply; tied to ground for single +5V operation with proper biasing |
| 11, 13, 15 (OUT A/B/C) | Amplifier output (per channel) | Capable of ±4.0V swing into no load; drives 75Ω/100Ω loads directly with <0.1dB flatness to 90MHz |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback architecture | Bandwidth independent of closed-loop gain - simplifies design across G = +1 to +10 without compensation redesign |
| Triple-channel integration | Three independent amplifiers in one SSOP-16 package - reduces PCB area vs discrete solutions for RGB/ADC systems |
| Single-supply operation | 1V–4V output swing on +5V rail with 150MHz bandwidth - eliminates negative rail in portable video equipment |
| Low-distortion output stage | 0.07% differential gain / 0.02° phase error at NTSC - meets broadcast video standards without external trimming |
| Fast disable control | 25ns enable / 400ns disable timing - enables time-multiplexed channel switching in multi-source video systems |
Applications
| RGB Line Driver | ADC Input Buffer |
|---|---|
|
Use Scenario: Driving red/green/blue signals from graphics processor to 75Ω coaxial video outputs in digital signage or medical imaging displays. IC Role / Device Role / Timing Role: Triple-channel voltage buffer with matched gain and phase across all three channels to preserve color fidelity and timing alignment. Use Value: 0.07% differential gain ensures accurate color reproduction; 280MHz bandwidth supports 1080p60 signals with <0.1dB flatness to 90MHz. |
Use Scenario: Conditioning analog inputs for high-speed CMOS ADCs (e.g., ADS831) in digitizers or spectrum analyzers. IC Role / Device Role / Timing Role: Wideband driver providing 3VPP output swing, 150MHz full-power bandwidth, and low harmonic distortion to maximize SFDR. Use Value: –74dBc 3rd-harmonic distortion at 5MHz enables >70dB SNR in 8-bit, 80MSPS converters without degrading ENOB. |
| Wideband Video Multiplexer | High-Speed Imaging Channel |
|
Use Scenario: Switching between two RGB video sources (e.g., camera and HDMI) using make-before-break disable control in broadcast switchers. IC Role / Device Role / Timing Role: Dual-package wired-OR multiplexer where DIS pins select active source; 82.5Ω limiting resistors prevent shoot-through. Use Value: <20mV switching glitch ensures artifact-free transitions; off-isolation of 70dB prevents crosstalk between inactive channels. |
Use Scenario: Signal conditioning in X-ray CT or ultrasound beamforming modules requiring low-noise, high-slew amplification of pulsed echoes. IC Role / Device Role / Timing Role: Low-latency buffer (12ns 0.02% settling) preserving pulse edge integrity for time-of-flight measurements. Use Value: 2100V/µs slew rate resolves sub-5ns pulses; 1.7nV/√Hz input noise maintains dynamic range in low-amplitude echo detection. |
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 |
|---|---|---|---|
| OPA3690IDBQT | Voltage-feedback architecture; lower bandwidth (250MHz G=+1), higher supply current (6.5mA/ch), no disable pin | Lacks channel shutdown; less suitable for power-constrained portable instruments or time-multiplexed systems | Select when absolute lowest input offset voltage (±0.3mV) is prioritized over power savings or disable functionality |
| OPA2691U | Dual-channel only; identical current-feedback core, same 280MHz bandwidth and 2100V/µs slew rate | Requires two packages for triple-channel needs; increases board area and BOM count vs single OPA3691IDBQT | Select when system only needs two high-speed channels and space allows dual SO-8 footprint |
Compared with OPA3690IDBQT, the OPA3691IDBQT offers 30% lower quiescent current and integrated disable control - critical for battery-powered video gear. Against OPA2691U, it consolidates three channels into one SSOP-16, reducing layout complexity and inter-channel skew in RGB timing-critical systems.
Availability
OPA3691IDBQT is available at Aetrix Electronics and suitable for RGB line drivers, high-speed ADC buffers, and broadband video multiplexers requiring stable component supply across industrial, medical imaging, and broadcast equipment lifecycles.
Supply support for OPA3691IDBQT 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-performance op amps and signal chain solutions.
The OPA3691IDBQT belongs to TI's OPAx691 family of current-feedback amplifiers, designed specifically for demanding wideband video, imaging, and data acquisition systems where gain-flat bandwidth and low distortion are essential.
FAQ
What supply voltages does the OPA3691IDBQT support?
The OPA3691IDBQT operates from a flexible supply range: single +5V to +12V or dual ±2.5V to ±6V. At ±5V, it delivers ±4.0V output swing and 280MHz bandwidth; on +5V single supply, it provides 1V–4V output with 190MHz bandwidth at G = +2. Absolute maximum ratings allow ±6.5V, but performance specifications are guaranteed only within the specified operating range.
How does the disable function work on the OPA3691IDBQT?
The OPA3691IDBQT has three independent disable pins (DIS A/B/C). Pulling any DIS pin LOW (<1.5V) places that channel's output in high-impedance state and reduces its supply current to <150µA/ch. Leaving DIS open or HIGH (>3.3V) enables normal operation. The disable timing is make-before-break (25ns enable, 400ns disable), preventing output glitches during switching - confirmed in TI SBOS227E Figure 12.
Can the OPA3691IDBQT drive 75Ω video cables directly?
Yes - the OPA3691IDBQT is characterized to drive 75Ω loads with 0.07% differential gain and 0.02° differential phase error at NTSC frequencies, meeting broadcast video standards. Its 190mA output current and 280MHz bandwidth ensure minimal signal degradation; typical designs use 82.5Ω series output resistors to match 75Ω cable impedance while maintaining +1 gain.
What is the small-signal bandwidth of the OPA3691IDBQT at G = +2?
At G = +2, the OPA3691IDBQT achieves 225MHz minimum small-signal bandwidth (VO = 0.5VPP, RF = 402Ω, ±5V supply) and 190MHz minimum on +5V single supply (RF = 453Ω). This gain-independent bandwidth is a hallmark of its current-feedback architecture - verified in TI SBOS227E Electrical Characteristics Table 1.
Is the OPA3691IDBQT suitable for driving ADC inputs in high-speed data acquisition?
Yes - the OPA3691IDBQT is explicitly recommended by TI for triple-channel ADC driving (e.g., ADS831). It delivers 3VPP output swing on +5V supply with >150MHz full-power bandwidth and –74dBc 3rd-harmonic distortion at 5MHz, preserving SFDR and ENOB. Its low 1.7nV/√Hz input noise and fast 12ns 0.02% settling time make it ideal for pipelined and flash ADC front-ends.
OPA3691IDBQT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SSOP (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 3
- Output Type:
- -
- Slew Rate:
- 2100V/µs
- Gain Bandwidth Product:
- 280 MHz
- -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-SSOP
OPA3691IDBQT FAQ
1.How can I place an order for OPA3691IDBQT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA3691IDBQT 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 OPA3691IDBQT reliable?
The price and inventory of OPA3691IDBQT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA3691IDBQT is usually 5 days.
3.What payment methods are accepted for OPA3691IDBQT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA3691IDBQT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA3691IDBQT?
OPA3691IDBQT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA3691IDBQT 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 OPA3691IDBQT?
For technical support, including OPA3691IDBQT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA3691IDBQT requirements.
6.How does Aetrix verify that OPA3691IDBQT is sourced from the original manufacturer or authorized distributors?
All OPA3691IDBQT 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 OPA3691IDBQT meets industry standards.
7.What is the process for return or replacement of OPA3691IDBQT?
All OPA3691IDBQT units undergo pre-shipment inspection (PSI). If there is an issue with OPA3691IDBQT, 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 OPA3691IDBQT part is unused and in its original packaging.
Return procedure for OPA3691IDBQT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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