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Texas Instruments OPA4684ID
- Part No.:
- OPA4684ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4684ID.pdf
- Description:
- IC OPAMP CFA 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,066
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Product details
Overview
OPA4684ID from Texas Instruments is a quad, low-power, current-feedback operational amplifier in SO-14 package, delivering 170MHz bandwidth at G = +2, 120mA output drive, and 1.7mA/channel quiescent current under ±5V supply. It serves as a high-fidelity video driver and ADC input buffer in broadcast, instrumentation, and multichannel signal conditioning systems.
For engineers reviewing the OPA4684ID datasheet, OPA4684ID pinout, OPA4684ID application, or OPA4684ID equivalent, this page provides verified electrical specifications, SO-14 terminal mapping, CFBPLUS architecture context, differential gain/phase performance for NTSC video, and validated alternative options for low-power wideband amplifier selection.
Technical Context
The OPA4684ID implements a patented CFBPLUS architecture with an internally closed-loop input buffer stage that linearizes inverting-input impedance, enabling near-constant bandwidth across gains from +1 to +20 and minimizing harmonic distortion degradation at higher gains. Its transimpedance gain (ZOL) is 355kΩ min at 25°C, supporting stable closed-loop operation with RF = 800Ω (±5V) or 1kΩ (+5V).
This architecture decouples gain-setting resistor (RG) from bandwidth interaction, allowing peaking networks and multichannel summing topologies without sacrificing small-signal flatness. Input common-mode range extends to ±3.75V on ±5V supplies, and output swing reaches ±4.1V into 1kΩ - enabling single +5V operation with 3VPP output swing into 100Ω while maintaining >86MHz large-signal bandwidth.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +2, ±5V) | 170MHz min - supports HD video line drivers and >100Msps ADC front-ends without gain-dependent roll-off. |
| Output Current | ±120mA min sourcing/sinking - drives doubly terminated 50Ω cables or multiple 150Ω video loads simultaneously. |
| Supply Current/Ch | 1.7mA max at ±5V - enables 4-channel wideband amplification within 7mA total IQ, critical for portable/battery-powered systems. |
| Harmonic Distortion | –78dBc 2nd/3rd @ 5MHz, 2VPP, RL ≥ 1kΩ - meets broadcast video differential gain/phase specs (0.04%/0.02°). |
| Input Voltage Noise | 3.7nV/√Hz typ >1MHz - preserves SNR in high-gain post-amplifier stages for SAW filters and IF chains. |
| Common-Mode Range | ±3.75V min on ±5V - allows rail-to-rail input signal handling with 1.25V headroom, simplifying DC-coupled interface design. |
| Slew Rate | 750V/µs min (G = +2) - ensures faithful reproduction of fast video edges and pulse signals without slew-induced distortion. |
Pinout & Package
OPA4684ID is housed in a 14-pin SOIC (SO-14) package with standard JEDEC MS-012AC footprint (5.3mm × 10.2mm), θJA = 100°C/W, rated for –40°C to +85°C ambient operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | +Input A/B/C/D | Noninverting inputs for each of four independent amplifier channels; 50kΩ || 2pF input impedance enables stable high-Z sensor interfacing. |
| 2, 6, 10, 14 | –Input A/B/C/D | Inverting inputs with 4Ω typical resistance; low, linearized impedance ensures consistent bandwidth vs. gain in CFBPLUS topology. |
| 3, 7, 11, 12 | Output A/B/C/D | Class-AB output stages capable of ±4.1V swing into 1kΩ; closed-loop output impedance <6mΩ at 100kHz minimizes load-induced gain error. |
| 4 | +V | Positive supply pin shared by all four channels; accepts +2.8V to +12V (single) or up to ±6V (dual) with full spec compliance. |
| 8 | –V | Negative supply pin; supports dual ±2.5V to ±6V operation; internal biasing maintains performance across full voltage range. |
Key Features
| Feature | Design Value |
|---|---|
| CFBPLUS architecture | Internally buffered inverting input delivers <1% bandwidth variation from G = +1 to +20, eliminating gain-dependent compensation redesign. |
| Single-supply capability | Operates from +5V with 2.5V input common-mode bias and 3VPP output swing into 100Ω - enables compact video interface boards without split rails. |
| Low distortion at high frequency | –78dBc 2nd/3rd harmonic @ 5MHz ensures NTSC/PAL composite video meets SMPTE 253M differential gain/phase limits. |
| High output drive | Delivers >±100mA into 50Ω while maintaining >±3V swing - supports studio camera line drivers and multi-drop broadcast distribution. |
| Thermal stability | Quiescent current shift <±0.15mA over –40°C to +85°C; offset drift ±12µV/°C - reduces calibration burden in industrial temperature environments. |
Applications
| Broadcast Video Driver | ADC Input Driver |
|---|---|
|
Use Scenario: Driving 75Ω coaxial cable from SD/HD video encoder ASIC to monitor or recording equipment. IC Role / Device Role / Timing Role: Quad-channel buffer with DC coupling, gain = +2, matched 50Ω input/output termination. Use Value: 0.04% differential gain and 0.02° differential phase error preserve color fidelity; 170MHz bandwidth supports 1080p60 RGB sampling. |
Use Scenario: Conditioning analog sensor outputs before digitization in high-speed data acquisition systems. IC Role / Device Role / Timing Role: Single-ended to differential converter and anti-alias filter driver for 16-bit, 100Msps ADCs. Use Value: 3.7nV/√Hz input noise and –78dBc distortion maintain >86dB SNR; 750V/µs slew rate prevents aperture uncertainty at full scale. |
| SAW Filter Post-Amplifier | Multi-Channel Summing Amplifier |
|
Use Scenario: Amplifying narrowband IF signals from surface acoustic wave filters in wireless baseband receivers. IC Role / Device Role / Timing Role: High-gain (G = +10 to +20), low-noise post-amplifier with minimal peaking and flat group delay. Use Value: >120MHz bandwidth at G = +10 and <–70dBc 3rd-harmonic enable clean amplification of 40–100MHz IF bands without image distortion. |
Use Scenario: Summing outputs from four parallel DACs in waveform synthesis or beamforming applications. IC Role / Device Role / Timing Role: Four independent inverting summing nodes with matched gain and phase response. Use Value: Channel-to-channel crosstalk <–52dB and <6.8ns rise time ensure coherent summation of 50MHz+ signals with sub-degree phase alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2684ID | Dual-channel version in same SO-14 package; identical AC/DC specs per channel but lower total quiescent current (3.4mA vs 6.8mA). | Preferred for space-constrained dual-amplifier designs where quad density is unnecessary. | Select OPA2684ID when only two channels are required and board area or power budget is constrained. |
| OPA684ID | Same CFBPLUS architecture but higher quiescent current (3.5mA/ch); offers improved slew rate (1000V/µs) and output drive (±200mA). | Better suited for driving heavy capacitive loads or demanding line-driver applications requiring >±4V swing into 50Ω. | Choose OPA684ID when higher output power and faster transient response outweigh low-power requirements. |
Compared with OPA2684ID, the OPA4684ID provides double channel count in identical footprint at 2× quiescent power; versus OPA684ID, it trades 40% lower IQ for reduced slew rate and output current - making it optimal for battery-powered multichannel video or instrumentation where efficiency and integration density are primary.
Availability
OPA4684ID is available at Aetrix Electronics and suitable for broadcast video infrastructure, high-speed data acquisition, and multichannel signal conditioning requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA4684ID 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 innovation in precision amplifiers and high-speed signal chain solutions.
The OPA4684ID belongs to TI's CFBPLUS current-feedback op amp product line, engineered specifically for low-power, wideband applications including broadcast video, medical imaging, and test equipment where gain-flat bandwidth and low distortion are critical.
FAQ
What is the maximum operating supply voltage for the OPA4684ID?
The OPA4684ID supports a maximum dual-supply voltage of ±6V and a maximum single-supply voltage of +12V. Absolute maximum ratings specify ±6.5VDC on the power pins; operation beyond ±6V or +12V risks permanent damage. At ±6V, the device maintains full specification compliance including 170MHz bandwidth and ±120mA output drive, as confirmed in the Electrical Characteristics table under "Maximum Operating Voltage Range".
Does the OPA4684ID support true single-supply operation with rail-to-rail input and output?
The OPA4684ID supports single +5V operation with input common-mode range from 1.25V to 3.75V (i.e., 1.25V above V– and 1.25V below V+) and output swing from 0.9V to 4.1V into 1kΩ - not rail-to-rail, but sufficient for 3VPP signals centered at 2.5V. It requires external biasing (e.g., resistive divider) on the noninverting input and AC coupling for full dynamic range, as detailed in Figure 3 of the datasheet.
What is the recommended feedback resistor value for G = +2 in dual-supply configuration?
The datasheet specifies RF = 800Ω as the recommended feedback resistor for G = +2 operation with ±5V supplies to achieve optimal bandwidth flatness and minimal peaking. This value is validated across temperature and process corners, and deviation significantly degrades 0.1dB gain flatness (e.g., 19MHz at RF = 800Ω vs <10MHz at RF = 1.3kΩ). RG is then set to 800Ω to realize G = +2 in noninverting mode.
How does the OPA4684ID's CFBPLUS architecture improve distortion performance compared to standard CFB amplifiers?
The OPA4684ID's CFBPLUS architecture integrates a closed-loop input buffer that linearizes the inverting-input impedance, reducing harmonic distortion by up to 15dB at 5MHz versus earlier low-power CFB designs. Specifically, 2nd-harmonic distortion improves from –62dBc to –78dBc at G = +2, VO = 2VPP, due to minimized nonlinear current injection at the inverting node - a key limitation in conventional CFB topologies.
Is the OPA4684ID pin-compatible with other devices in the OPA68x family?
No, the OPA4684ID is not pin-compatible with OPA683, OPA684, or OPA691. While all share the same SO-14 package outline, pin functions differ: OPA4684ID uses pins 1/5/9/13 for +inputs and 2/6/10/14 for –inputs, whereas OPA684ID assigns pins 1/8 for +/– inputs of Channel A only. Substituting without PCB revision will result in incorrect channel routing and functional failure.
OPA4684ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 780V/µs
- Gain Bandwidth Product:
- 1.9 GHz
- -3db Bandwidth:
- 95 MHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 1.5 mV
- Current - Supply:
- 1.7mA (x4 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:
- 14-SOIC
OPA4684ID FAQ
1.How can I place an order for OPA4684ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4684ID 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 OPA4684ID reliable?
The price and inventory of OPA4684ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4684ID is usually 5 days.
3.What payment methods are accepted for OPA4684ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4684ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4684ID?
OPA4684ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4684ID 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 OPA4684ID?
For technical support, including OPA4684ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4684ID requirements.
6.How does Aetrix verify that OPA4684ID is sourced from the original manufacturer or authorized distributors?
All OPA4684ID 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 OPA4684ID meets industry standards.
7.What is the process for return or replacement of OPA4684ID?
All OPA4684ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA4684ID, 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 OPA4684ID part is unused and in its original packaging.
Return procedure for OPA4684ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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