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Texas Instruments OPA4684IPWT
- Part No.:
- OPA4684IPWT
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
OPA4684IPWT.pdf
- Description:
- IC OPAMP CFA 4 CIRCUIT 14TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,924
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Product details
Overview
OPA4684IPWT from Texas Instruments is a quad, low-power, current-feedback operational amplifier optimized for wideband video and signal conditioning applications. It delivers 170MHz bandwidth at G = +2, 120mA output drive, < –78dBc harmonic distortion at 5MHz, and operates from ±2.5V to ±6V or +2.8V to +12V supplies - enabling use in broadcast video drivers, ADC input stages, and multichannel summing amplifiers.
For engineers reviewing the OPA4684IPWT datasheet, OPA4684IPWT pinout, OPA4684IPWT application, or OPA4684IPWT equivalent, key selection criteria include its CFBPLUS architecture with linearized inverting-input impedance, minimal bandwidth variation across gain (G = +1 to +20), single-supply 5V operation with 3VPP output swing into 100Ω, and TSSOP-14 package compatibility with space-constrained PCB layouts.
Technical Context
The OPA4684IPWT implements a patented CFBPLUS architecture featuring an internally closed-loop input buffer stage that linearizes inverting-input impedance (~5Ω), decoupling bandwidth and distortion performance from gain-setting resistor variations. This enables stable 0.1dB gain flatness up to 19MHz at G = +2 and supports frequency-peaking elements without bandwidth collapse.
Its transimpedance gain (ZOL) is 355kΩ min at 25°C, with open-loop phase margin preserved to >100MHz. The amplifier maintains >110MHz small-signal bandwidth on +5V supply (RF = 1.3kΩ) and achieves 780V/µs slew rate in dual-supply mode - critical for fast-pulse video and high-fidelity analog front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +2) | 170MHz typical (±5V); enables NTSC/PAL video signal amplification without gain-dependent roll-off |
| Output Current | ±120mA min sourcing/sinking (±5V); drives 50Ω doubly-terminated lines or multiple 150Ω video loads |
| Harmonic Distortion | < –78dBc 2nd/3rd at 5MHz, 2VPP (RL ≥ 1kΩ); preserves signal fidelity in broadcast-grade video paths |
| Supply Range | ±2.5V to ±6V or +2.8V to +12V; supports legacy bipolar systems and modern single-rail industrial designs |
| Quiescent Current | 1.7mA/ch max (±5V); 6.8mA total for quad channel - enables battery-powered or thermally constrained modules |
| Input Voltage Noise | 3.7nV/√Hz typ (>1MHz); low-noise performance suitable for high-resolution ADC driver applications |
| Differential Gain/Phase | 0.04% / 0.02° (NTSC, G = +2); meets broadcast video specification requirements for color accuracy |
Pinout & Package
TSSOP-14 package (PW suffix), 5.0mm × 4.4mm footprint, 0.65mm pitch, exposed thermal pad (not electrically connected). Designed for automated assembly and thermal dissipation in dense layouts.
| 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 || 1pF input impedance |
| 2, 6, 10, 14 | –Input A/B/C/D | Inverting inputs; low linearized impedance (~5Ω) enables stable CFB operation across gain configurations |
| 3, 7, 11, 12 | Output A/B/C/D | Class-AB output stage; delivers ±4VPP swing on ±5V, or 0.9V to 4.1V on +5V supply |
| 4 | +V | Positive power supply pin; accepts +2.8V to +12V (single) or +6V max (dual rail) |
| 8 | –V | Negative power supply pin; accepts –6V min (dual rail); not used in single-supply mode |
Key Features
| Feature | Design Value |
|---|---|
| CFBPLUS architecture | Internally buffered inverting input yields near-ideal current feedback behavior: bandwidth remains stable from G = +1 to +20 |
| Low-power wideband operation | 170MHz BW at 1.7mA/ch enables high-speed signal chains without thermal derating in compact enclosures |
| Single-supply video capability | 3VPP output swing into 100Ω on +5V supply supports composite video, S-video, and RGB line driving |
| High-output-current drive | 120mA sourcing/sinking allows direct interface to 50Ω coaxial cables or multiple parallel video loads |
| Broadcast-grade linearity | 0.04% differential gain / 0.02° differential phase meets SMPTE 253M and ITU-R BT.601 standards |
Applications
| Broadcast Video Driver | ADC Input Driver |
|---|---|
Use Scenario: Driving NTSC/PAL composite video signals from encoder ASICs to BNC connectors over 50Ω coaxial cable. IC Role / Device Role / Timing Role: Final-stage voltage buffer and level shifter with DC coupling and precise gain control. Use Value: 0.04% differential gain ensures accurate color reproduction; 120mA output sustains signal integrity across 100m cable runs. |
Use Scenario: Conditioning analog sensor outputs before sampling by 12-bit+ SAR or pipeline ADCs. IC Role / Device Role / Timing Role: Wideband, low-noise gain stage with fast settling (<60ns to 0.05%) and low THD. Use Value: 3.7nV/√Hz input noise and <–78dBc distortion preserve ENOB; 170MHz BW supports undersampling architectures. |
| Multichannel Summing Amplifier | Wideband Differential Channel |
Use Scenario: Combining four independent RF or IF signal paths in spectrum analyzers or software-defined radios. IC Role / Device Role / Timing Role: Inverting summing node with matched gain and phase response per channel. Use Value: All-hostile crosstalk of –52dB at 5MHz prevents inter-channel interference; consistent BW vs gain simplifies calibration. |
Use Scenario: Generating balanced differential signals for high-speed ADCs or transformerless transmission lines. IC Role / Device Role / Timing Role: Dual-opamp configuration implementing noninverting differential I/O (Figure 5). Use Value: Matched channel performance ensures <0.1° phase skew; 170MHz BW supports >50Msps sampling rates. |
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; identical CFBPLUS architecture, same 170MHz BW and 120mA drive, but only two channels in SO-8 | Suitable when board space permits SO-8 and only two channels needed; lacks quad integration for space-critical designs | Select OPA2684IDR if reducing channel count simplifies layout or lowers BOM cost without sacrificing per-channel performance. |
| OPA691U | Higher slew rate (1800V/µs), 500MHz BW, but 6.5mA/ch quiescent current - 3.8× higher power than OPA4684IPWT | Used in ultra-high-speed test equipment where bandwidth >300MHz is mandatory; not viable for battery or thermally limited systems | Choose OPA691U only when absolute bandwidth and slew rate outweigh power and thermal constraints. |
Compared with OPA2684IDR and OPA691U, the OPA4684IPWT uniquely balances quad-channel density, 170MHz bandwidth, and 1.7mA/ch power - making it optimal for multichannel video distribution, portable instrumentation, and power-sensitive high-fidelity analog signal chains.
Availability
OPA4684IPWT is available at Aetrix Electronics and suitable for broadcast video infrastructure, high-speed data acquisition systems, and multichannel signal processing equipment requiring stable component supply, full traceability, and long-term lifecycle support.
Supply support for OPA4684IPWT 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 expertise in high-performance op amps and precision signal-chain solutions.
The OPA4684IPWT belongs to TI's CFBPLUS current-feedback op amp product line, engineered specifically for low-power, wideband applications demanding broadcast-grade video fidelity, multichannel integration, and flexible single/dual-supply operation.
FAQ
What is the maximum operating supply voltage for OPA4684IPWT?
The OPA4684IPWT supports a maximum dual-supply voltage of ±6V and a maximum single-supply voltage of +12V. Absolute maximum ratings specify ±6.5VDC on power pins; exceeding these risks permanent damage. Operation at ±6V or +12V is fully characterized and supported across the –40°C to +85°C temperature range, with bandwidth and output drive remaining within datasheet limits.
Does OPA4684IPWT support true single-supply operation with rail-to-rail input and output?
The OPA4684IPWT supports single-supply operation from +2.8V to +12V but does not feature rail-to-rail input or output. Its input common-mode range extends from 1.25V to 3.75V on +5V supply (i.e., 1.25V above V– and 1.25V below V+), and output swings from 0.9V to 4.1V into 1kΩ. These headroom requirements are explicitly specified and validated in the datasheet's Electrical Characteristics tables.
What is the recommended feedback resistor value for OPA4684IPWT at G = +2 in dual-supply mode?
The datasheet specifies RF = 800Ω as the recommended feedback resistor for G = +2 operation with ±5V supplies. This value optimizes bandwidth flatness (19MHz 0.1dB gain flatness), minimizes peaking (<6.3dB), and maintains stability across temperature. Using RF values significantly outside 800Ω ±10% degrades bandwidth predictability and may increase distortion - confirmed by Figure 1 and AC performance tables.
How does OPA4684IPWT achieve low distortion at high frequencies?
The OPA4684IPWT achieves <–78dBc 2nd/3rd harmonic distortion at 5MHz through its CFBPLUS architecture: the closed-loop input buffer linearizes inverting-input impedance, reducing distortion caused by nonlinear feedback current sensing. This is verified by measured distortion vs. frequency plots (Figure 6) and load-resistance curves showing –84dBc at RL ≥ 1kΩ - directly attributable to the buffered input stage design.
Is OPA4684IPWT pin-compatible with other TI quad CFB amplifiers like OPA4658?
No, OPA4684IPWT is not pin-compatible with OPA4658. While both are quad CFB amplifiers in TSSOP-14 packages, their pinouts differ: OPA4684IPWT assigns pins 1/5/9/13 to +inputs and 2/6/10/14 to –inputs, whereas OPA4658 uses a different channel mapping and power pin arrangement. PCB redesign is required for substitution - confirmed by comparing SBOS240G (OPA4684) and SBOS229 (OPA4658) datasheet pin diagrams.
OPA4684IPWT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 780V/µs
- Gain Bandwidth Product:
- 120 MHz
- -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-TSSOP
OPA4684IPWT FAQ
1.How can I place an order for OPA4684IPWT through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4684IPWT 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 OPA4684IPWT reliable?
The price and inventory of OPA4684IPWT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4684IPWT is usually 5 days.
3.What payment methods are accepted for OPA4684IPWT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4684IPWT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4684IPWT?
OPA4684IPWT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4684IPWT 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 OPA4684IPWT?
For technical support, including OPA4684IPWT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4684IPWT requirements.
6.How does Aetrix verify that OPA4684IPWT is sourced from the original manufacturer or authorized distributors?
All OPA4684IPWT 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 OPA4684IPWT meets industry standards.
7.What is the process for return or replacement of OPA4684IPWT?
All OPA4684IPWT units undergo pre-shipment inspection (PSI). If there is an issue with OPA4684IPWT, 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 OPA4684IPWT part is unused and in its original packaging.
Return procedure for OPA4684IPWT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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