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Texas Instruments OPA684IDR
- Part No.:
- OPA684IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA684IDR.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,270
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Product details
Overview
OPA684IDR from Texas Instruments is a low-power, current-feedback operational amplifier with disable control, designed for high-bandwidth video and signal conditioning applications. It delivers 120MHz bandwidth at G = +10, –78dBc 2nd-harmonic distortion at 5MHz (RL ≥ 1kΩ), ±4V output swing on ±5V supplies, and 1.7mA quiescent current - enabling broadcast video drivers and ADC input stages in space- and power-constrained systems.
For engineers reviewing the OPA684IDR datasheet, OPA684IDR pinout, OPA684IDR application, or OPA684IDR equivalent, key selection considerations include its CFBplus architecture's gain-independent bandwidth, 100µA shutdown current, SO-8 package thermal resistance (125°C/W), and verified performance in NTSC composite video (0.04% differential gain, 0.02° differential phase).
Technical Context
The OPA684IDR implements a patented CFBplus architecture featuring an internally closed-loop input buffer stage that linearizes inverting-input impedance, enabling stable bandwidth up to G = +20 without peaking. Its transimpedance gain (ZOL) is 355kΩ min at ±5V, with <2.5Ω inverting-input resistance and 50kΩ || 2pF non-inverting input impedance.
This architecture decouples gain-setting resistor (RG) selection from bandwidth degradation - unlike conventional CFB op amps - allowing flexible frequency response shaping, multichannel summing with minimal gain-bandwidth trade-off, and stable operation into capacitive loads up to 100pF without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +10) | 120MHz typical - supports >100MHz video baseband and high-speed data acquisition without gain-dependent roll-off. |
| 2nd-Harmonic Distortion (5MHz, RL ≥ 1kΩ) | –78dBc max - ensures <0.01% harmonic error in professional camera front-ends and ADC driver stages. |
| Output Current (Sourcing) | 160mA min - drives ±4VPP into 100Ω while maintaining linearity for doubly terminated 50Ω video lines. |
| Quiescent Supply Current | 1.7mA max at ±5V - enables battery-powered portable video equipment and multi-channel systems with tight power budgets. |
| Disable Current | 100µA max - reduces system standby power by >94% while placing I/O pins in high-impedance state. |
| Input Voltage Noise | 3.7nV/√Hz typ - preserves SNR in low-level signal amplification paths such as sensor interfaces and post-filter stages. |
| Enable Time | 40ns typical - supports fast-switching applications like multiplexed video routing and burst-mode signal processing. |
Pinout & Package
OPA684IDR is housed in an SO-8 (D) surface-mount package with exposed pad for thermal enhancement, rated for –40°C to +85°C operation and θJA = 125°C/W.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–) | Low-impedance (2.5Ω) current-sensing node for feedback error current; requires precise RG/RF matching for stable CFB operation. |
| 2 | Noninverting Input (+) | High-impedance (50kΩ || 2pF) voltage reference point; sets common-mode bias and defines input offset behavior. |
| 3 | –VS | Negative supply rail; must be decoupled with ≥0.1µF ceramic capacitor near pin for stability under high-frequency load transients. |
| 4 | Disable (DIS) | Active-low enable control; pulled HIGH or left open for normal operation; driven LOW to reduce supply current to ≤100µA. |
| 5 | +VS | Positive supply rail; supports ±2.5V to ±6V dual or +2.8V to +12V single supply; internal biasing maintains performance across range. |
| 6 | Output | Class-AB output stage capable of sourcing/sinking >100mA; exhibits 0.006Ω closed-loop output impedance at 100kHz. |
| 7 | NC | No connection - electrically isolated; no internal bond wire or circuitry attached. |
| 8 | NC | No connection - electrically isolated; no internal bond wire or circuitry attached. |
Key Features
| Feature | Design Value |
|---|---|
| CFBplus Architecture | Internally buffered inverting input enables near-constant bandwidth from G = +1 to +20 - eliminates traditional CFB gain-bandwidth trade-off. |
| NTSC Video Performance | 0.04% differential gain / 0.02° differential phase at G = +2 - meets broadcast-grade video line driver requirements without external calibration. |
| Single-Supply Operation | Functions from +2.8V to +12V with 1.25V input headroom and 1.0V output headroom - enables direct interface with 3.3V/5V logic and ADCs. |
| Fast Enable/Disable | 40ns enable time and 4ms disable time - supports dynamic power gating in time-multiplexed imaging and communication systems. |
| Low Distortion at High Frequency | –70dBc 3rd-harmonic at 5MHz (RL = 100Ω) - preserves spectral purity in SAW filter post-amplifiers and RF IF chains. |
Applications
| Professional Broadcast Video Drivers | ADC Input Drivers |
|---|---|
Use Scenario: Driving multiple 75Ω coaxial video lines from a studio camera head to recording and monitoring equipment. IC Role / Device Role / Timing Role: Final-stage current-feedback buffer providing gain, drive strength, and DC coupling while preserving NTSC/PAL timing integrity. Use Value: Delivers 0.04% differential gain and 0.02° differential phase at G = +2, supporting four parallel 150Ω video loads without external equalization. |
Use Scenario: Conditioning analog sensor outputs before sampling by 12–16-bit SAR or pipeline ADCs in test equipment. IC Role / Device Role / Timing Role: Wideband, low-noise gain stage with fast settling (<60ns to 0.05%) and minimal harmonic distortion to preserve ENOB. Use Value: 3.7nV/√Hz input voltage noise and –78dBc 2nd-harmonic at 5MHz ensure >78dB SFDR in 10MHz bandwidth applications. |
| SAW Filter High-Gain Post-Amplifiers | Multichannel Summing Amplifiers |
Use Scenario: Amplifying narrowband RF IF signals after bandpass filtering in spectrum analyzers and comms receivers. IC Role / Device Role / Timing Role: Low-distortion, high-output-current post-filter amplifier compensating for SAW insertion loss while maintaining group delay flatness. Use Value: 120mA output current and –70dBc 3rd-harmonic at 5MHz enable >20dB gain into 50Ω loads without clipping or intermodulation. |
Use Scenario: Summing multiple video or instrumentation channels in broadcast switchers or data acquisition backplanes. IC Role / Device Role / Timing Role: Inverting-summing node with linearized inverting input impedance to prevent gain-dependent bandwidth collapse across channels. Use Value: CFBplus architecture retains >100MHz bandwidth even with five 1kΩ input resistors, eliminating need for per-channel gain staging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA691IDR | Higher slew rate (1800 V/µs), 500MHz bandwidth, 4.5mA quiescent current - optimized for >200MHz signal chains. | Not suitable for ultra-low-power designs; requires higher PCB layout care due to increased sensitivity to parasitics. | Select when bandwidth >300MHz is required and power budget allows >2.5× OPA684IDR quiescent current. |
| OPA683IDR | Lower quiescent current (1.1mA), 80MHz bandwidth at G = +10, reduced output current (80mA) - scaled-down CFBplus variant. | Limited to single-load video or low-current ADC driving; insufficient for 100Ω doubly terminated lines. | Select for battery-powered portable instruments where 80MHz bandwidth suffices and sub-1.2mA supply current is mandatory. |
Compared with OPA684IDR, OPA691IDR trades 2.6× higher power for >4× bandwidth and slew rate, while OPA683IDR reduces power by 35% but sacrifices 33% bandwidth and 33% output drive - making OPA684IDR the optimal balance for broadcast video and mid-speed ADC interfaces.
Availability
OPA684IDR is available at Aetrix Electronics and suitable for professional broadcast video drivers, ADC input stages, SAW filter post-amplifiers, and multichannel summing amplifiers requiring stable component supply, full traceability, and long-term industrial lifecycle support.
Supply support for OPA684IDR 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 over 50 years of innovation in precision amplifiers and high-speed signal conditioning.
The OPA684IDR belongs to TI's CFBplus current-feedback op amp product line, engineered specifically for low-power, high-fidelity video distribution, instrumentation front-ends, and wideband data acquisition systems demanding gain-stable bandwidth and ultra-low distortion.
FAQ
What is the maximum operating supply voltage for OPA684IDR?
The OPA684IDR supports a maximum dual-supply voltage of ±6V and a maximum single-supply voltage of +12V, with absolute maximum ratings of ±6.5V. Operation beyond these limits risks permanent damage. The device is fully specified from ±2.5V to ±6V dual supply or +2.8V to +12V single supply, with performance remaining stable across this range due to internal supply-independent biasing.
Does OPA684IDR support true single-supply operation with rail-to-rail input and output?
The OPA684IDR does not feature rail-to-rail input or output. Its input common-mode range extends to within 1.25V of either supply rail (e.g., 1.25V to 3.75V on +5V), and output swing reaches within 1.0V of each rail (e.g., 1.0V to 4.0V on +5V). This enables robust single-supply use in video and ADC driver applications without requiring level-shifting circuitry.
How does the CFBplus architecture in OPA684IDR improve upon standard current-feedback op amps?
The CFBplus architecture integrates a closed-loop input buffer that linearizes the inverting-input impedance to ~2.5Ω across frequency and gain. This eliminates the gain-dependent bandwidth roll-off and peaking seen in conventional CFB amplifiers, enabling stable 120MHz bandwidth at G = +10 and 104MHz at G = +20 - a key advantage for multichannel summing and programmable-gain video systems.
What is the recommended feedback resistor value for OPA684IDR in a G = +2 configuration?
For optimal bandwidth flatness and stability at G = +2, TI specifies RF = 1kΩ with RG = 1kΩ under ±5V operation, and RF = 1.3kΩ with RG = 1.3kΩ under +5V single-supply operation. Deviating significantly from these values increases peaking or reduces bandwidth; RF values below 800Ω risk instability, while values above 1.5kΩ degrade high-frequency response.
Can OPA684IDR drive a 50Ω doubly terminated coaxial cable directly?
Yes - the OPA684IDR delivers ±4VPP into 100Ω (equivalent to 50Ω doubly terminated) on ±5V supplies with <0.1dB gain flatness to 19MHz and –78dBc 2nd-harmonic distortion at 5MHz. Its 160mA sourcing capability and 0.006Ω closed-loop output impedance ensure minimal signal reflection and amplitude droop across the video baseband.
OPA684IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 820V/µs
- Gain Bandwidth Product:
- 1.9 GHz
- -3db Bandwidth:
- 210 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):
- 5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA684IDR FAQ
1.How can I place an order for OPA684IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA684IDR 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 OPA684IDR reliable?
The price and inventory of OPA684IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA684IDR is usually 5 days.
3.What payment methods are accepted for OPA684IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA684IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA684IDR?
OPA684IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA684IDR 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 OPA684IDR?
For technical support, including OPA684IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA684IDR requirements.
6.How does Aetrix verify that OPA684IDR is sourced from the original manufacturer or authorized distributors?
All OPA684IDR 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 OPA684IDR meets industry standards.
7.What is the process for return or replacement of OPA684IDR?
All OPA684IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA684IDR, 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 OPA684IDR part is unused and in its original packaging.
Return procedure for OPA684IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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