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Texas Instruments OPA3684IDBQT
- Part No.:
- OPA3684IDBQT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-SSOP (0.154", 3.90mm Width)
- Datasheet:
-
OPA3684IDBQT.pdf
- Description:
- IC OPAMP CFA 3 CIRCUIT 16SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,266
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Product details
Overview
OPA3684IDBQT from Texas Instruments is a triple-channel, low-power current-feedback operational amplifier with independent 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 ADC input stages requiring wideband, low-distortion signal conditioning.
For engineers reviewing the OPA3684IDBQT datasheet, OPA3684IDBQT pinout, OPA3684IDBQT application, or OPA3684IDBQT equivalent, key selection criteria include gain-bandwidth stability across G = +1 to +20, shutdown current below 100µA/ch, differential gain/phase error under 0.04%/0.02° for NTSC video, and SSOP-16 package compatibility with high-density video routing layouts.
Technical Context
The OPA3684IDBQT implements CFBPLUS architecture with an internally closed-loop input buffer stage that linearizes inverting-input impedance, enabling near-constant bandwidth and distortion across gain settings from +1 to +20. Its transimpedance gain of 355kΩ (min) and 4.0Ω inverting-input resistance support precise feedback network design.
This triple-channel amplifier uses independent disable pins (DIS A/B/C) to reduce supply current to <100µA/ch while placing I/O in high-impedance state. Its 1.7mA/ch quiescent current is trimmed at 25°C and shifts less than ±0.3mA over –40°C to +85°C, supporting stable operation in broadcast video and portable instrumentation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +2) | 170MHz min - enables full HD RGB signal amplification without peaking compensation |
| Harmonic Distortion (5MHz) | < –82dBc (2nd), < –84dBc (3rd) at RL ≥ 1kΩ - preserves color fidelity in professional camera signal chains |
| Output Current | ±120mA min sourcing/sinking - drives 50Ω doubly-terminated cables or three 150Ω video loads simultaneously |
| Supply Current (per ch) | 1.7mA max at ±5V - supports battery-powered portable video equipment with thermal headroom |
| Disable Current (per ch) | < 100µA - reduces system standby power by >94% versus active mode |
| Differential Gain/Phase | 0.04% / 0.02° (NTSC, RL = 150Ω) - meets SMPTE 253M broadcast video specification |
| Input Voltage Range | ±3.75V (dual), 1.25V to 3.75V (single +5V) - accommodates DC-coupled sensor interfaces and AC-coupled baseband video |
Pinout & Package
OPA3684IDBQT is housed in a 16-pin SSOP (DBQ) package with 0.65mm pitch, 5.0mm × 6.2mm body size, and exposed thermal pad (not electrically connected). Pin 1 is marked with a dot; pin numbering follows standard SSOP convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 14, 15, 16 | Channel Disable (DIS A/B/C) | Active-low logic inputs; pull LOW to disable channel and reduce supply current to <100µA/ch |
| 4 | +VS | Positive supply rail connection for all three channels |
| 5, 9, 12 | +Input A/B/C | Noninverting inputs; 50kΩ || 1pF input impedance supports high-Z sensor interfacing |
| 6, 10, 13 | –Input A/B/C | Inverting inputs; 4.0Ω input resistance enables precise RF/RG feedback network design |
| 7, 11, 8 | Output A/B/C | Class-AB output stage capable of ±4V swing on ±5V supplies and >±3Vp-p into 50Ω |
| 11 | –VS | Negative supply rail connection for all three channels |
Key Features
| Feature | Design Value |
|---|---|
| CFBPLUS architecture | Internally buffered inverting input delivers stable 170MHz bandwidth from G = +1 to +10 without external compensation |
| Independent channel disable | Three dedicated DIS pins enable selective power-down of unused channels in multichannel video systems |
| Single-supply operation | Operates from +2.8V to +12V with 1.25V input headroom and 1.0V output headroom - supports compact +5V-only designs |
| Low distortion at high frequency | < –82dBc 2nd-harmonic at 5MHz ensures minimal color crosstalk in RGB and YUV component video paths |
| High output drive | ±120mA output current sustains >±3Vp-p into 50Ω - eliminates need for external buffer stages in broadcast line drivers |
Applications
| RGB Line Drivers | ADC Input Drivers |
|---|---|
Use Scenario: Driving three parallel RGB signals from graphics processor to display interface with minimal inter-channel crosstalk. IC Role / Device Role / Timing Role: Triple-channel current-feedback amplifier providing matched gain, phase, and settling time across R/G/B paths. Use Value: 70dB all-hostile crosstalk at 5MHz prevents color bleeding; 4ns rise/fall time preserves pixel clock integrity up to 100MHz. |
Use Scenario: Conditioning analog sensor outputs before digitization in high-speed data acquisition systems. IC Role / Device Role / Timing Role: Low-noise, wideband buffer isolating ADC front-end from source impedance variations. Use Value: 3.7nV/√Hz input voltage noise and 17pA/√Hz inverting-input current noise minimize SNR degradation at 10-bit+ resolution. |
| Professional Cameras | Equalizing Filters |
Use Scenario: Amplifying and equalizing baseband video signals in studio-grade digital cinema cameras. IC Role / Device Role / Timing Role: Triple-channel video driver with differential gain/phase error under 0.04%/0.02° for NTSC compliance. Use Value: Maintains chroma/luma timing alignment across temperature; 0.1dB gain flatness to 19MHz supports 1080p60 signal bandwidth. |
Use Scenario: Implementing programmable peaking networks in cable equalizers for HDMI or SDI signal recovery. IC Role / Device Role / Timing Role: Current-feedback amplifier allowing frequency response shaping via RF/RG element freedom. Use Value: Gain-setting elements can be added without bandwidth penalty - enables tunable 0.5–20MHz peaking filters. |
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; same CFBPLUS architecture but no per-channel disable pins | Lacks independent channel shutdown - unsuitable for dynamic power management in triple-channel systems | Select when only two channels are needed and board space is constrained |
| OPA3691IDBVT | Triple-channel, higher-power variant (3.5mA/ch, 250mA output); wider bandwidth (400MHz at G=+2) | Higher supply current and thermal dissipation - requires heatsinking in dense layouts | Select when driving long 50Ω coaxial runs or multiple video loads simultaneously |
Compared with OPA3684IDBQT, OPA2684IDR offers identical AC performance in half the channel count and no disable control, while OPA3691IDBVT trades 2× quiescent power for 2.3× bandwidth and 2× output current - making OPA3684IDBQT optimal for power-sensitive, triple-channel video routing where 170MHz suffices.
Availability
OPA3684IDBQT is available at Aetrix Electronics and suitable for RGB line drivers, ADC input conditioning, professional camera signal chains, and equalizing filter designs requiring stable component supply across industrial temperature ranges.
Supply support for OPA3684IDBQT 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPA3684IDBQT belongs to TI's CFBPLUS current-feedback op amp product line, designed specifically for low-power, high-fidelity video signal distribution and high-speed data acquisition where bandwidth stability across gain and ultra-low distortion are critical.
FAQ
What supply voltage ranges does the OPA3684IDBQT support?
The OPA3684IDBQT supports dual supplies from ±2.5V to ±6V and single supplies from +2.8V to +12V. At ±5V, it delivers ±4V output swing; at +5V, it provides 0.9V to 4.1V output range with 1.25V input headroom. The device maintains specified AC performance across this full range due to internal supply-independent biasing, making OPA3684IDBQT suitable for both portable battery-powered and fixed-line broadcast equipment.
How does the OPA3684IDBQT achieve stable bandwidth across different gains?
The OPA3684IDBQT achieves stable bandwidth using its CFBPLUS architecture with an internally closed-loop input buffer stage that linearizes inverting-input impedance. This design decouples bandwidth from gain-setting resistor values, enabling 170MHz bandwidth at G = +2 and >120MHz at G = +10. Unlike conventional CFB amplifiers, OPA3684IDBQT avoids significant peaking or roll-off when adjusting RG, preserving flat frequency response in RGB line drivers and equalizing filters.
What is the purpose of the three separate disable pins on the OPA3684IDBQT?
The three disable pins (DIS A, DIS B, DIS C) on the OPA3684IDBQT provide independent channel-level power control. Pulling any DIS pin LOW reduces that channel's supply current to <100µA while placing its I/O pins in high-impedance state. This allows dynamic power management in multichannel systems - for example, disabling unused RGB channels during standby or powering down individual ADC driver channels in sleep mode - without affecting other active channels in the OPA3684IDBQT.
Can the OPA3684IDBQT drive 50Ω transmission lines directly?
Yes, the OPA3684IDBQT can drive 50Ω transmission lines directly, delivering >±3Vp-p into 50Ω with <–82dBc distortion at 5MHz. Its ±120mA output current and low closed-loop output impedance (0.006Ω at 100kHz) ensure minimal signal reflection and amplitude loss. For optimal matching, use series termination at the amplifier output (e.g., 45Ω resistor) when driving doubly-terminated 50Ω cables - a configuration validated in TI's Figure 1 test circuit for OPA3684IDBQT.
What video standards does the OPA3684IDBQT meet for differential gain and phase?
The OPA3684IDBQT meets broadcast-grade video specifications with 0.04% differential gain error and 0.02° differential phase error at NTSC frequencies (RL = 150Ω, G = +2), complying with SMPTE 253M and ITU-R BT.601 requirements. These values are measured across –40°C to +85°C and remain stable due to the CFBPLUS architecture's low distortion and high CMRR (60dB min), making OPA3684IDBQT suitable for professional camera outputs and studio monitor distribution.
OPA3684IDBQT 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:
- 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
OPA3684IDBQT FAQ
1.How can I place an order for OPA3684IDBQT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA3684IDBQT 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 OPA3684IDBQT reliable?
The price and inventory of OPA3684IDBQT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA3684IDBQT is usually 5 days.
3.What payment methods are accepted for OPA3684IDBQT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA3684IDBQT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA3684IDBQT?
OPA3684IDBQT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA3684IDBQT 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 OPA3684IDBQT?
For technical support, including OPA3684IDBQT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA3684IDBQT requirements.
6.How does Aetrix verify that OPA3684IDBQT is sourced from the original manufacturer or authorized distributors?
All OPA3684IDBQT 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 OPA3684IDBQT meets industry standards.
7.What is the process for return or replacement of OPA3684IDBQT?
All OPA3684IDBQT units undergo pre-shipment inspection (PSI). If there is an issue with OPA3684IDBQT, 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 OPA3684IDBQT part is unused and in its original packaging.
Return procedure for OPA3684IDBQT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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