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Texas Instruments OPA2684IDCNTG4
- Part No.:
- OPA2684IDCNTG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2684IDCNTG4.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,547
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Product details
Overview
OPA2684IDCNTG4 from Texas Instruments is a dual-channel, low-power current-feedback operational amplifier optimized for high-speed video and broadband signal conditioning. It delivers 170MHz bandwidth at G = +2, –82dBc 2nd-harmonic distortion at 5MHz (RL ≥ 1kΩ), and ±120mA output drive on ±5V supplies - enabling use in professional broadcast video drivers and ADC input stages.
For engineers reviewing the OPA2684IDCNTG4 datasheet, OPA2684IDCNTG4 pinout, OPA2684IDCNTG4 application, or OPA2684IDCNTG4 equivalent, key selection considerations include its CFBPLUS architecture with linearized inverting-input impedance, single-supply (+5V) compatibility, differential gain/phase performance (<0.04%/0.02°), and SOT23-8 package thermal resistance (150°C/W).
Technical Context
The OPA2684IDCNTG4 implements a CFBPLUS topology featuring an internally closed-loop input buffer stage that linearizes inverting-input impedance, minimizing bandwidth degradation and harmonic distortion across gain settings. This architecture enables stable operation from G = +1 to +20 while retaining >120MHz bandwidth up to G = +10.
It supports both bipolar (±2.5V to ±6V) and single-ended (+2.8V to +12V) supply configurations, with rail-to-rail input voltage range (±3.6V on ±5V) and output swing (±3.8V on ±5V). Its transimpedance gain (ZOL) is 153kΩ min over temperature, and closed-loop output impedance is 6mΩ at 100kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +2) | 170MHz min (±5V, RF = 800Ω) - enables NTSC/PAL video amplification without peaking compensation |
| Harmonic Distortion (2nd, 5MHz) | –82dBc max (RL ≥ 1kΩ) - meets broadcast video differential phase/gain specs (0.02°/0.04%) |
| Output Current | ±120mA min (sourcing/sinking) - drives 50Ω doubly-terminated lines or multiple 150Ω video loads |
| Supply Current | 3.4mA total (1.7mA/channel @ ±5V) - enables dual-channel high-speed amplification under 4mW/channel |
| Input Voltage Noise | 4.4nV/√Hz max (>1MHz) - preserves SNR in wideband ADC driver applications up to 100MHz |
| Channel Isolation | 70dB typ @ 5MHz - prevents crosstalk in multichannel summing or differential filter topologies |
| Slew Rate (G = +2) | 656V/µs min - supports <4V step response in <3.8ns for fast-pulse instrumentation |
Pinout & Package
SOT23-8 package (DCN), 8-pin surface-mount, 2.9mm × 2.8mm footprint, 150°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Out A) | Channel A output | Low-impedance buffered output capable of ±120mA drive into 50Ω |
| 2 (–In A) | Channel A inverting input | Low-linearized impedance node (≈4Ω) for stable CFB feedback network design |
| 3 (+In A) | Channel A noninverting input | 50kΩ || 1pF input impedance; supports DC-coupled or AC-coupled biasing |
| 4 (–VS) | Negative supply rail | Accepts –2.5V to –6V (bipolar) or ground (single-supply); must be decoupled |
| 5 (+VS) | Positive supply rail | Accepts +2.5V to +6V (bipolar) or +2.8V to +12V (single); 1.2V headroom required |
| 6 (Out B) | Channel B output | Independent output with matched AC/DC specs to Out A; enables dual-path filtering |
| 7 (–In B) | Channel B inverting input | Electrically identical to Pin 2; supports independent feedback networks per channel |
| 8 (+In B) | Channel B noninverting input | Identical to Pin 3; allows separate common-mode biasing for differential configurations |
Key Features
| Feature | Design Value |
|---|---|
| CFBPLUS architecture | Internally buffered inverting input achieves near-ideal current-feedback behavior: bandwidth varies <10% from G = +1 to +10 |
| Single-supply operation | +5V compatible with 1.2V input headroom and 1.0V output headroom - enables direct interface with 3.3V logic and ADCs |
| Video-optimized linearity | Differential gain error <0.04% and phase error <0.02° (NTSC, RL = 150Ω) - meets SMPTE 259M broadcast compliance |
| Thermal stability | Quiescent current shift <±0.1mA over –40°C to +85°C - eliminates gain drift in unregulated industrial enclosures |
| Low-noise, high-drive synergy | 4.4nV/√Hz input noise + ±120mA output current enables clean 100MHz signal amplification into reactive video loads |
Applications
| Professional Broadcast Video Driver | ADC Input Driver |
|---|---|
Use Scenario: Driving 150Ω composite video loads in studio camera signal chains with minimal group delay variation. IC Role / Device Role / Timing Role: Final-stage video buffer with DC-coupled G = +2 configuration and 50Ω source termination. Use Value: 0.04% differential gain and 0.02° phase error preserve color fidelity; 170MHz bandwidth supports HD-SDI eye diagram integrity. |
Use Scenario: Conditioning analog signals prior to sampling by 10-bit+, 50MSPS+ ADCs in test equipment. IC Role / Device Role / Timing Role: Wideband gain block with low THD and flat frequency response up to Nyquist. Use Value: –82dBc 2nd-harmonic distortion at 5MHz ensures >9.5 ENOB; 3.8ns rise time matches fast ADC aperture clocks. |
| Differential Equalizing Filter | Multichannel Summing Amplifier |
Use Scenario: Post-amplifying SAW filter outputs in DSL line cards where amplitude ripple must be corrected. IC Role / Device Role / Timing Role: Inverting G = –1 stage with adjustable RG/RM for precise peaking compensation. Use Value: Linearized inverting input impedance allows stable insertion of LC peaking networks without bandwidth collapse. |
Use Scenario: Summing four sensor outputs in industrial IoT nodes with simultaneous high-speed acquisition. IC Role / Device Role / Timing Role: Dual-channel inverting summer (one OPA2684IDCNTG4 handles two sums) with matched gain paths. Use Value: 70dB channel isolation prevents inter-channel crosstalk; 120mA drive sustains summed output into 100Ω loads. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2683IDCNT | Lower quiescent current (2.6mA total), reduced bandwidth (140MHz @ G=+2), same SOT23-8 package | Better suited for battery-powered portable video monitors where power budget <3mW/channel is critical | Select when thermal dissipation or standby power dominates over peak bandwidth requirements |
| OPA2691IDGKT | Higher output current (±250mA), wider bandwidth (≥400MHz), SO-8 package (θJA = 125°C/W) | Required for driving long 50Ω coaxial runs or high-capacitance LCD panel interfaces | Select when >±150mA drive or >250MHz small-signal bandwidth is mandatory |
Compared with OPA2683IDCNT and OPA2691IDGKT, the OPA2684IDCNTG4 uniquely balances 170MHz bandwidth, –82dBc distortion, ±120mA drive, and 3.4mA total supply current in the space-constrained SOT23-8 package - making it optimal for dual-channel, thermally limited broadcast and instrumentation designs.
Availability
OPA2684IDCNTG4 is available at Aetrix Electronics and suitable for professional broadcast video drivers, ADC input conditioning, differential equalizing filters, and multichannel summing amplifiers requiring stable component supply across extended temperature ranges.
Supply support for OPA2684IDCNTG4 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision amplifiers and high-speed signal chain components.
The OPA2684IDCNTG4 belongs to TI's CFBPLUS current-feedback op amp product line, engineered specifically for low-power, high-fidelity video distribution, high-speed data acquisition, and broadband communications infrastructure where bandwidth, linearity, and thermal efficiency are co-constrained.
FAQ
What supply voltage ranges does the OPA2684IDCNTG4 support?
The OPA2684IDCNTG4 operates from ±2.5V to ±6V in dual-supply mode and +2.8V to +12V in single-supply mode. At ±5V, it delivers full ±4V output swing; at +5V, output swings from 0.9V to 4.1V with 1.0V headroom to each rail. The device maintains specified AC performance across this entire range due to internal supply-independent biasing.
How does the CFBPLUS architecture improve bandwidth stability in the OPA2684IDCNTG4?
The OPA2684IDCNTG4 uses an internally closed-loop input buffer to linearize the inverting-input impedance to ≈4Ω, decoupling feedback network behavior from gain-setting resistor variations. This enables bandwidth to remain >120MHz from G = +2 to +10 - unlike conventional CFB amps where bandwidth drops sharply above G = +5.
Can the OPA2684IDCNTG4 drive 50Ω transmission lines directly?
Yes - the OPA2684IDCNTG4 sources/sinks ±120mA minimum, supporting >±3Vp-p into 50Ω loads on ±5V supplies. For doubly-terminated 50Ω lines, configure as G = +2 with 800Ω feedback and 50Ω series output resistor. Output impedance is 6mΩ at 100kHz, ensuring minimal mismatch-induced reflections.
What is the thermal performance of the OPA2684IDCNTG4 in its SOT23-8 package?
The OPA2684IDCNTG4 in SOT23-8 (DCN) package has a junction-to-ambient thermal resistance (θJA) of 150°C/W. At 3.4mA total supply current and ±120mA load, power dissipation remains <350mW, limiting junction temperature rise to <53°C above ambient - well within the –40°C to +85°C operating range.
Does the OPA2684IDCNTG4 require external compensation for stability?
No - the OPA2684IDCNTG4 is unity-gain stable and requires no external compensation. Its CFBPLUS architecture provides phase margin >60° across all gains from G = +1 to +20 when using the recommended 800Ω feedback resistor (RF) with standard PCB layout practices (short traces, local 0.1µF bypassing at each supply pin).
OPA2684IDCNTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 2
- Output Type:
- Differential
- Slew Rate:
- 780V/µs
- Gain Bandwidth Product:
- 1.9 GHz
- -3db Bandwidth:
- 250 MHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 1.7mA (x2 Channels)
- 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:
- SOT-23-8
OPA2684IDCNTG4 FAQ
1.How can I place an order for OPA2684IDCNTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2684IDCNTG4 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 OPA2684IDCNTG4 reliable?
The price and inventory of OPA2684IDCNTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2684IDCNTG4 is usually 5 days.
3.What payment methods are accepted for OPA2684IDCNTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2684IDCNTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2684IDCNTG4?
OPA2684IDCNTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2684IDCNTG4 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 OPA2684IDCNTG4?
For technical support, including OPA2684IDCNTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2684IDCNTG4 requirements.
6.How does Aetrix verify that OPA2684IDCNTG4 is sourced from the original manufacturer or authorized distributors?
All OPA2684IDCNTG4 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 OPA2684IDCNTG4 meets industry standards.
7.What is the process for return or replacement of OPA2684IDCNTG4?
All OPA2684IDCNTG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2684IDCNTG4, 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 OPA2684IDCNTG4 part is unused and in its original packaging.
Return procedure for OPA2684IDCNTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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