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Texas Instruments OPA3691IDBQTG4
- Part No.:
- OPA3691IDBQTG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
OPA3691IDBQTG4.pdf
- Description:
- IC OPAMP CFA 3 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,904
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Product details
Overview
OPA3691IDBQTG4 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 RGB line driving and single-supply +5V ADC input conditioning with >150MHz full-power bandwidth.
For engineers reviewing the OPA3691IDBQTG4 datasheet, OPA3691IDBQTG4 pinout, OPA3691IDBQTG4 application, or OPA3691IDBQTG4 equivalent, key selection criteria include its current-feedback architecture's gain-independent bandwidth, low disable current (150µA/ch), improved high-frequency pinout for reduced crosstalk, and verified performance in composite video dG/dP (<0.17%), harmonic distortion (–74dBc 3rd-harmonic @5MHz), and 0.02% settling in 12ns.
Technical Context
The OPA3691IDBQTG4 employs a current-feedback topology with transimpedance gain (ZOL) of 225kΩ (±5V), enabling stable operation at G = +1 to +10 without external compensation. Its output stage architecture minimizes voltage headroom and crossover distortion, supporting ±4.0V swing into no load and ±3.9V into 100Ω on ±5V supplies.
Each channel features independent disable control (DIS A/B/C) with 25ns enable time, 400ns disable time, and <±50mV turn-on glitch. The SSOP-16 package integrates three matched amplifiers sharing common ±VS pins but with isolated input/output/disabled terminals - critical for maintaining channel independence in RGB and triple-ADC buffer designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +1) | 280MHz - enables stable unity-gain video amplification without peaking beyond 0.2dB. |
| Slew Rate | 2100V/µs - supports clean 5VPP step response with 1.9ns rise time and 12ns 0.02% settling. |
| Output Current (Sourcing/Sinking) | ±190mA - drives 75Ω video loads, 100Ω ADC inputs, or multiple parallel 150Ω loads without clipping. |
| Supply Current (3 ch) | 15.3mA max (±5V) - enables low-power portable instrumentation and battery-backed systems. |
| Disable Current | 150µA/ch - reduces total system power by >99% when channels are inactive, preserving signal integrity. |
| Differential Gain/Phase (NTSC) | 0.07%/0.02° - meets broadcast-grade video fidelity requirements for RGB and composite video paths. |
| Input Voltage Noise | 1.7nV/√Hz (>1MHz) - maintains SNR in high-bandwidth signal chains up to 200MHz. |
Pinout & Package
OPA3691IDBQTG4 is packaged in a 16-pin SSOP (DBQ) surface-mount package with exposed thermal pad, rated for –40°C to +85°C operation and θJA = 100°C/W. Pinout is optimized for high-frequency layout: noninverting inputs (pins 2, 5, 8) and outputs (pins 11, 13, 15) are interleaved with dedicated disable controls (pins 3, 6, 9) and shared power rails (pins 4/+VS, 12/–VS) to minimize crosstalk and ground bounce.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 16 | NC / Thermal Pad | No-connect; thermal pad must be soldered to PCB ground plane for thermal management. |
| 2, 5, 8 | +IN A/B/C | Noninverting inputs - high-impedance (100kΩ || 2pF), support DC-coupled or AC-coupled biasing. |
| 3, 6, 9 | DIS A/B/C | Active-low disable control - pull LOW to reduce supply current to <150µA/ch and place output in Hi-Z. |
| 4 | +VS | Positive supply rail - accepts +5V to +12V single or ±2.5V to ±6V dual supply. |
| 7, 10, 14 | –IN A/B/C | Inverting inputs - low impedance (~37Ω), require matched feedback networks for stability. |
| 11, 13, 15 | OUT A/B/C | High-current outputs - deliver ±190mA into resistive loads; output capacitance in disable = 4pF. |
| 12 | –VS | Negative supply rail - required for dual-supply operation; tied to GND for single +5V use. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable current-feedback architecture | Eliminates need for external compensation across G = +1 to +10, simplifying filter and driver design. |
| Improved high-frequency pinout | Reduces inter-channel crosstalk to –80dBc at 5MHz, critical for RGB and triple-ADC simultaneous sampling. |
| Single +5V operation with 3VPP swing | Enables direct interface to 3.3V logic and CMOS ADCs without level-shifting or rail-splitting circuitry. |
| Matched triple-channel performance | Guarantees <0.17% differential gain error and <0.07° differential phase error across all three channels. |
| Low-glitch disable/enable | ±50mV turn-on and ±20mV turn-off glitches ensure clean switching in RGB multiplexers and power-gated systems. |
Applications
| RGB Line Driver | Triple-Channel ADC Buffer |
|---|---|
|
Use Scenario: Driving red, green, and blue analog video signals from graphics processor to display panel over 75Ω coaxial cables. IC Role / Device Role / Timing Role: Triple current-feedback op amp providing gain-of-1, DC-coupled buffering with minimal group delay variation across 0–150MHz. Use Value: Maintains <0.07% differential gain and <0.02° differential phase for NTSC/PAL compliance while delivering ±3.9V swing into 75Ω. |
Use Scenario: Conditioning three parallel analog inputs for high-speed pipelined ADCs (e.g., ADS831) in digitizers or spectrum analyzers. IC Role / Device Role / Timing Role: Simultaneous, matched-channel driver with 12ns 0.02% settling and <–74dBc 3rd-harmonic distortion at 5MHz. Use Value: Preserves SFDR of 8-bit, 80MSPS converters by avoiding amplifier-induced harmonic degradation. |
| High-Speed Imaging Channel | Composite Video DAC Reconstruction Filter |
|
Use Scenario: Amplifying pixel clock-synchronized analog outputs from CCD/CMOS image sensors in medical or industrial cameras. IC Role / Device Role / Timing Role: Wideband buffer with 2100V/µs slew rate and 200MHz large-signal bandwidth for 2VPP imaging waveforms. Use Value: Supports >100fps frame rates with sub-ns timing fidelity and <2.3ns rise/fall time for sharp edge preservation. |
Use Scenario: Implementing sin(x)/x compensation filters after high-speed video DACs to suppress aliasing artifacts. IC Role / Device Role / Timing Role: Fixed-gain active element in delay-equalized RC network, leveraging gain-flat bandwidth up to 90MHz (0.1dB flatness). Use Value: Enables >150MHz reconstruction bandwidth with <0.1dB passband ripple and monotonic group delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-channel, wideband current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA3691IDBQR | Same die, tape-and-reel packaging (2500 pcs), identical electrical specs and pinout. | No functional difference - selected for volume production vs. prototype quantities (250 pcs). | Choose OPA3691IDBQR for cost-optimized manufacturing; OPA3691IDBQTG4 for evaluation and low-volume builds. |
| OPA3690IDBQT | Voltage-feedback architecture; lower bandwidth (250MHz G=+1), higher supply current (6.5mA/ch), no disable function. | Lacks channel disable and exhibits gain-dependent bandwidth - unsuitable for power-gated or gain-flexible systems. | Select OPA3690IDBQT only if voltage-feedback linearity requirements outweigh need for disable control and bandwidth stability. |
Compared with OPA3691IDBQR and OPA3690IDBQT, the OPA3691IDBQTG4 uniquely combines current-feedback gain-independence, sub-50mV switching glitches, and 150µA/ch disable current - making it the only option qualified for low-power, multi-channel video routing and synchronized ADC front-ends.
Availability
OPA3691IDBQTG4 is available at Aetrix Electronics and suitable for RGB line drivers, triple-channel ADC buffers, and high-speed imaging systems requiring stable component supply, guaranteed traceable sourcing, and long-term lifecycle support.
Supply support for OPA3691IDBQTG4 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 amps and precision signal chain solutions.
The OPA3691IDBQTG4 belongs to TI's OPAx691 family of current-feedback amplifiers, designed specifically for wideband video, instrumentation, and data acquisition systems demanding high output drive, low distortion, and flexible power management.
FAQ
What supply voltages does the OPA3691IDBQTG4 support?
The OPA3691IDBQTG4 operates from ±2.5V to ±6V dual supply or +5V to +12V single supply. At ±5V, it delivers ±4.0V output swing with 190mA drive; at +5V, it provides 1V–4V output swing with >150MHz bandwidth. Minimum single-supply voltage is +4V, maximum is +12V - verified across –40°C to +85°C.
How does the disable function work on the OPA3691IDBQTG4?
The OPA3691IDBQTG4 has three independent active-low disable pins (DIS A/B/C, pins 3/6/9). Pulling any DIS pin LOW reduces that channel's supply current to <150µA/ch and places its output in high-impedance state. Enable time is 25ns; disable time is 400ns. Turn-on/off glitches are ±50mV and ±20mV respectively - confirmed under G = +2, RL = 150Ω conditions.
Is the OPA3691IDBQTG4 suitable for driving 75Ω video loads?
Yes - the OPA3691IDBQTG4 delivers ±3.9V output swing into 100Ω and maintains <0.17% differential gain / <0.07° differential phase on NTSC signals at 150Ω loads. Its 190mA output current and low closed-loop output impedance (0.03Ω @100kHz) ensure stable 75Ω termination without gain droop or group delay distortion up to 150MHz.
What is the small-signal bandwidth of the OPA3691IDBQTG4 at G = +2?
At G = +2, the OPA3691IDBQTG4 achieves 225MHz minimum small-signal bandwidth (VO = 0.5VPP, RF = 402Ω, RL = 100Ω, ±5V supply) and 190MHz minimum under +5V single-supply conditions (RF = 453Ω). Bandwidth remains stable across temperature (–40°C to +85°C) and load variations - a core advantage of its current-feedback architecture.
Does the OPA3691IDBQTG4 require external compensation?
No - the OPA3691IDBQTG4 is unity-gain stable and requires no external compensation components across gains from +1 to +10. Its current-feedback architecture ensures bandwidth remains largely independent of closed-loop gain, unlike voltage-feedback op amps. Stability is verified with standard 402Ω/453Ω feedback networks and 100Ω loads per the datasheet test circuits.
OPA3691IDBQTG4 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:
- 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
OPA3691IDBQTG4 FAQ
1.How can I place an order for OPA3691IDBQTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA3691IDBQTG4 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 OPA3691IDBQTG4 reliable?
The price and inventory of OPA3691IDBQTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA3691IDBQTG4 is usually 5 days.
3.What payment methods are accepted for OPA3691IDBQTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA3691IDBQTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA3691IDBQTG4?
OPA3691IDBQTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA3691IDBQTG4 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 OPA3691IDBQTG4?
For technical support, including OPA3691IDBQTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA3691IDBQTG4 requirements.
6.How does Aetrix verify that OPA3691IDBQTG4 is sourced from the original manufacturer or authorized distributors?
All OPA3691IDBQTG4 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 OPA3691IDBQTG4 meets industry standards.
7.What is the process for return or replacement of OPA3691IDBQTG4?
All OPA3691IDBQTG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA3691IDBQTG4, 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 OPA3691IDBQTG4 part is unused and in its original packaging.
Return procedure for OPA3691IDBQTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA3691IDBQTG4 Tags
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