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Texas Instruments OPA2684IDCNT
- Part No.:
- OPA2684IDCNT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-8
- Datasheet:
-
OPA2684IDCNT.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,967
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Product details
Overview
OPA2684IDCNT from Texas Instruments is a dual, 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 camera analog front-ends and differential SAW filter post-amplifiers.
For engineers reviewing the OPA2684IDCNT datasheet, OPA2684IDCNT pinout, OPA2684IDCNT application, or OPA2684IDCNT equivalent, key selection criteria include its CFBPLUS architecture's gain-invariant bandwidth, 3.4mA total quiescent current, SOT23-8 package thermal resistance (150°C/W), and verified performance in single +5V and dual ±2.5V to ±6V supply configurations.
Technical Context
The OPA2684IDCNT employs a patented CFBPLUS architecture with an internally closed-loop input buffer stage that linearizes inverting-input impedance, enabling stable >120MHz bandwidth up to G = +10 and minimizing harmonic distortion across gain settings. Its transimpedance gain (ZOL) is 355kΩ min at +25°C, and inverting input resistance is 4.4Ω typ under open-loop DC conditions.
This architecture decouples gain-setting resistor (RG) selection from bandwidth degradation - unlike conventional CFB op amps - allowing peaking networks, multichannel summing topologies, and line drivers to retain full AC performance. Input voltage noise is 3.7nV/√Hz (f > 1MHz), and closed-loop output impedance is 0.006Ω at 100kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +2) | 170MHz min (±5V, RF = 800Ω) - supports NTSC/PAL video baseband and ADSL CO driver loop timing |
| Output Current | ±120mA min sourcing/sinking - drives 50Ω doubly-terminated cables or multiple 150Ω video loads |
| Harmonic Distortion | –82dBc 2nd-harmonic @ 5MHz, RL ≥ 1kΩ - meets broadcast video differential gain/phase specs (0.04%/0.02°) |
| Supply Current | 3.4mA total (±5V) - enables dual-channel high-speed amplification in thermally constrained SOT23-8 footprint |
| Input Voltage Range | ±3.6V min (±5V supplies) - supports rail-to-rail signal swing with 1.2V headroom for single +5V operation |
| Small-Signal Rise Time | 3ns typ (G = +2, 4V step) - ensures <1% settling in <60ns for fast pulse applications |
| Thermal Resistance θJA | 150°C/W (SOT23-8) - defines maximum power dissipation limit (≈267mW at +85°C ambient) |
Pinout & Package
SOT23-8 package (DCN) with exposed thermal pad; 1.6mm × 2.9mm body, 0.95mm height, 0.65mm pitch; rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Out A) | Channel A output | Delivers full ±4Vp-p swing into 1kΩ; capable of >±3Vp-p into 50Ω loads |
| 2 (–In A) | Channel A inverting input | Low 4.4Ω input resistance enables precise current-feedback loop control |
| 3 (+In A) | Channel A noninverting input | 50kΩ || 1pF input impedance; common-mode range extends to ±3.6V |
| 4 (–VS) | Negative supply rail | Accepts –2.5V to –6V; ESD-rated to 2000V HBM |
| 5 (+VS) | Positive supply rail | Accepts +2.5V to +6V; internal biasing maintains performance across supply range |
| 6 (Out B) | Channel B output | Independent output with matched AC/DC specs to Channel A |
| 7 (–In B) | Channel B inverting input | Same 4.4Ω resistance as Pin 2; enables synchronized dual-channel feedback design |
| 8 (+In B) | Channel B noninverting input | Identical input structure to Pin 3; supports differential I/O amplifier configurations |
Key Features
| Feature | Design Value |
|---|---|
| CFBPLUS architecture | Internally buffered inverting input yields linearized 4.4Ω impedance, enabling gain-independent bandwidth up to G = +10 |
| Low distortion at high frequency | –82dBc 2nd-harmonic @ 5MHz ensures broadcast video compliance without external filtering |
| Dual supply flexibility | Operates from ±2.5V to ±6V or single +5V to +12V - eliminates need for level-shifting in mixed-supply systems |
| High output drive | ±120mA output current supports driving two 75Ω video lines simultaneously with <0.1dB gain error |
| Thermally optimized SOT23-8 | 150°C/W θJA enables 267mW max dissipation in compact layout - critical for multi-amplifier video modules |
Applications
| Professional Broadcast Cameras | ADC Input Drivers |
|---|---|
Use Scenario: Driving analog video signals from CCD/CMOS sensors to 10-bit+ ADCs in studio-grade cameras. IC Role / Device Role / Timing Role: Dual-channel baseband amplifier providing gain, DC coupling, and 50Ω source termination before ADC sampling. Use Value: 170MHz bandwidth and –82dBc distortion preserve SNR and color fidelity; ±4Vp-p swing matches ADC input ranges without clipping. |
Use Scenario: Conditioning sensor outputs (e.g., pressure, temperature) prior to high-speed SAR or pipeline ADCs. IC Role / Device Role / Timing Role: Low-noise, fast-settling driver ensuring full-scale accuracy and minimal aperture jitter. Use Value: 3ns rise time and 60ns 0.05% settling enable >10MSPS sampling; 3.7nV/√Hz input noise minimizes added quantization error. |
| Differential SAW Filter Post-Amplifier | Short-Loop ADSL CO Driver |
Use Scenario: Amplifying filtered differential IF signals from SAW filters in DSL line cards before DAC or demodulation. IC Role / Device Role / Timing Role: Differential gain stage restoring signal amplitude lost in passive filter insertion loss. Use Value: Channel-to-channel isolation >70dB at 5MHz prevents crosstalk; matched dual channels maintain phase balance. |
Use Scenario: Transmitting upstream data signals over twisted-pair copper in central office DSLAM equipment. IC Role / Device Role / Timing Role: High-output-current line driver meeting ITU-T G.992.1 spectral mask and echo cancellation requirements. Use Value: ±120mA drive capability sustains >12dBm output into 100Ω hybrid; 170MHz bandwidth accommodates 2.2MHz upstream band. |
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 2.2mA total supply current; 130MHz bandwidth at G = +2; reduced output drive (±80mA) | Better suited for ultra-low-power portable video where bandwidth <130MHz is acceptable | Select OPA2683IDCNT when thermal budget is tighter and full 170MHz bandwidth is unnecessary |
| OPA2691IDGKT | Higher 400mA output current; 400MHz bandwidth at G = +2; 6.5mA supply current | Required for driving long 50Ω coaxial runs or high-capacitance loads (>100pF) | Choose OPA2691IDGKT only when OPA2684IDCNT's ±120mA drive is insufficient for the load |
Compared with OPA2684IDCNT, OPA2683IDCNT trades 40MHz bandwidth and 40mA output for 1.2mA lower quiescent current, while OPA2691IDGKT doubles output drive and bandwidth at 3× the power - making OPA2684IDCNT the optimal balance for space-constrained, medium-drive video and communications applications.
Availability
OPA2684IDCNT is available at Aetrix Electronics and suitable for professional broadcast cameras, ADC input conditioning, differential SAW filter post-amplification, and short-loop ADSL CO driver designs requiring stable component supply across industrial temperature ranges.
Supply support for OPA2684IDCNT 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 high-performance op amps and precision signal chain solutions.
The OPA2684IDCNT belongs to TI's CFBPLUS current-feedback op amp product line, engineered specifically for low-power, high-fidelity video signal distribution and broadband communications infrastructure where gain stability, distortion, and thermal efficiency are critical.
FAQ
What supply voltage ranges does the OPA2684IDCNT support?
The OPA2684IDCNT operates from dual ±2.5V to ±6V supplies or single +5V to +12V. At ±5V, it delivers full ±4Vp-p output swing and 170MHz bandwidth; at +5V single supply, bandwidth reduces to 110MHz min but retains 0.04% differential gain accuracy for NTSC video. The device's internal biasing ensures consistent performance across this full range without external adjustments.
How does the CFBPLUS architecture improve bandwidth stability in the OPA2684IDCNT?
The OPA2684IDCNT's CFBPLUS architecture uses an internally closed-loop input buffer to linearize the inverting input impedance to 4.4Ω, decoupling bandwidth from gain-setting resistor (RG) value. This allows bandwidth to remain >120MHz even at G = +10 - unlike conventional CFB op amps where bandwidth drops inversely with gain. The result is predictable, flat frequency response for video equalization and multichannel summing circuits.
Can the OPA2684IDCNT drive 50Ω transmission lines directly?
Yes, the OPA2684IDCNT can drive 50Ω loads directly: it delivers >±3Vp-p into 50Ω on ±5V supplies with <0.1dB gain flatness up to 19MHz. For doubly-terminated 50Ω lines, configure as a unity-gain follower with 50Ω series output resistor. Its 0.006Ω closed-loop output impedance ensures minimal signal reflection and preserves rise time integrity in high-speed interconnects.
What is the thermal performance of the OPA2684IDCNT in its SOT23-8 package?
The OPA2684IDCNT in SOT23-8 (DCN) package has a junction-to-ambient thermal resistance (θJA) of 150°C/W. With 3.4mA total supply current at ±5V (17mW static power), and assuming worst-case 250mW dynamic dissipation, junction temperature rise is ≤37.5°C above ambient - well within the +85°C max operating limit. PCB copper area under the thermal pad further improves heat dissipation.
Does the OPA2684IDCNT require external compensation for stability?
No, the OPA2684IDCNT is internally compensated and stable for gains ≥ +1 with recommended feedback resistors (RF = 800Ω for ±5V, 1kΩ for +5V). Its CFBPLUS architecture inherently avoids phase-margin issues common in voltage-feedback op amps. Stability is verified across –40°C to +85°C and all specified supply voltages; no external capacitors or network adjustments are needed for standard gain configurations.
OPA2684IDCNT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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
OPA2684IDCNT FAQ
1.How can I place an order for OPA2684IDCNT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2684IDCNT 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 OPA2684IDCNT reliable?
The price and inventory of OPA2684IDCNT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2684IDCNT is usually 5 days.
3.What payment methods are accepted for OPA2684IDCNT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2684IDCNT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2684IDCNT?
OPA2684IDCNT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2684IDCNT 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 OPA2684IDCNT?
For technical support, including OPA2684IDCNT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2684IDCNT requirements.
6.How does Aetrix verify that OPA2684IDCNT is sourced from the original manufacturer or authorized distributors?
All OPA2684IDCNT 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 OPA2684IDCNT meets industry standards.
7.What is the process for return or replacement of OPA2684IDCNT?
All OPA2684IDCNT units undergo pre-shipment inspection (PSI). If there is an issue with OPA2684IDCNT, 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 OPA2684IDCNT part is unused and in its original packaging.
Return procedure for OPA2684IDCNT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA2684IDCNT Tags
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