My Inquiry
My Account
Texas Instruments OPA4684IDG4
- Part No.:
- OPA4684IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4684IDG4.pdf
- Description:
- IC OPAMP CFA 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,148
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
OPA4684IDG4 from Texas Instruments is a quad, low-power, current-feedback operational amplifier optimized for wideband video and high-speed signal conditioning. It delivers 170MHz bandwidth at G = +2, < –78dBc harmonic distortion at 5MHz, 120mA output current, and operates from ±2.5V to ±6V or single +5V to +12V supplies. It is used in broadcast video drivers, ADC input interfaces, and multichannel summing amplifiers.
For engineers reviewing the OPA4684IDG4 datasheet, OPA4684IDG4 pinout, OPA4684IDG4 application, or OPA4684IDG4 equivalent, key selection criteria include bandwidth stability across gain, low distortion at 5MHz, output drive into 50Ω, single-supply operation headroom, and channel crosstalk performance in multichannel systems.
Technical Context
The OPA4684IDG4 implements CFBPLUS architecture with an internally closed-loop input buffer stage that linearizes inverting-input impedance, enabling near-constant bandwidth from G = +1 to G = +20. This eliminates traditional CFB gain-bandwidth tradeoffs while retaining low 1.7mA/ch quiescent current.
Its transimpedance gain (ZOL) is 355kΩ min at 25°C, and its inverting input resistance is 4.0Ω typ-critical for stable feedback network design. Output swing reaches ±4.1V on ±5V supplies with ≤1.2V input/output headroom, supporting robust single +5V operation with 3VPP output into 100Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth (G = +2) | 170MHz min - enables NTSC/PAL video signal amplification without gain-dependent roll-off |
| Harmonic Distortion (5MHz) | < –78dBc (2nd/3rd) at RL ≥ 1kΩ - preserves signal fidelity in broadcast-grade analog video paths |
| Output Current | ±120mA min sourcing/sinking - drives doubly terminated 50Ω cables or multiple 150Ω video loads |
| Supply Range | ±2.5V to ±6V or +2.8V to +12V - supports legacy bipolar and modern single-rail industrial/video systems |
| Quiescent Current | 1.7mA per channel max at ±5V - enables 4-channel wideband amplification under 7mA total supply draw |
| Input Voltage Noise | 3.7nV/√Hz typ above 1MHz - minimizes noise contribution in high-gain post-amplifier stages |
| Crosstalk (5MHz) | –52dB typ (input-referred, 3 channels driven) - ensures channel isolation in multichannel summing or differential I/O |
Pinout & Package
OPA4684IDG4 is packaged in SO-14 (D package), with exposed pad not present. Pin functions are identical across all four channels and follow standard quad op amp layout with independent inputs/outputs per channel and shared power rails.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 5, 9, 13 | +Input A/B/C/D | Noninverting input per channel; 50kΩ || 1pF typical impedance - sets common-mode range and bias current path |
| 2, 6, 10, 12 | –Input A/B/C/D | Inverting input per channel; 4.0Ω typical resistance - defines feedback node impedance critical for CFB stability |
| 3, 7, 11, 14 | Output A/B/C/D | Class-AB output stage; ±120mA drive capability - supports direct connection to 50Ω/75Ω transmission lines |
| 4 | +V | Positive supply rail for all channels; accepts up to +6V (dual) or +12V (single) - powers internal bias networks |
| 8 | –V | Negative supply rail (dual mode only); accepts down to –6V - enables true bipolar signal handling with ±4.1V swing |
Key Features
| Feature | Design Value |
|---|---|
| CFBPLUS architecture | Internally buffered inverting input yields 4.0Ω linearized impedance - maintains 120MHz bandwidth even at G = +10 |
| Single-supply compatibility | Operates from +2.8V to +12V with 1.25V input headroom and 0.9V output headroom - enables compact +5V camera front-ends |
| Low distortion at high frequency | < –78dBc 2nd/3rd harmonic at 5MHz into 1kΩ - meets SMPTE 259M differential gain/phase specs (0.04%/0.02°) |
| High channel isolation | –52dB input-referred crosstalk at 5MHz (3 channels active) - prevents interference in multichannel video routing |
| Thermally robust SO-14 | θJA = 100°C/W - sustains full 120mA output current per channel without derating below +85°C ambient |
Applications
| Broadcast Video Driver | ADC Input Driver |
|---|---|
Use Scenario: Driving composite NTSC video signals from encoder ASICs to coaxial distribution lines with minimal differential gain/phase error. IC Role / Device Role / Timing Role: Final-stage voltage buffer and level shifter delivering ±1.4VPP into 75Ω load with DC coupling. Use Value: 0.04% differential gain and 0.02° differential phase error preserve color fidelity across 4.2MHz baseband spectrum. |
Use Scenario: Conditioning analog sensor outputs prior to sampling by 10-bit+ ADCs in industrial data acquisition systems. IC Role / Device Role / Timing Role: Wideband gain block and anti-alias filter driver with 170MHz flat response up to Nyquist zone. Use Value: 3.7nV/√Hz input voltage noise and –78dBc distortion ensure >9.5 effective bits at 5MHz input frequency. |
| Multichannel Summing Amplifier | SAW Filter Post-Amplifier |
Use Scenario: Combining four independent RF IF signals in spectrum monitoring equipment before digitization. IC Role / Device Role / Timing Role: Inverting summing node with matched 50Ω inputs and 100Ω output termination. Use Value: –52dB crosstalk and 120mA output drive maintain signal integrity across all four summed channels simultaneously. |
Use Scenario: Amplifying narrowband SAW-filtered IF signals (e.g., 433MHz ISM band) with minimal added phase noise. IC Role / Device Role / Timing Role: High-Z noninverting gain stage following passive SAW filter with 50Ω source/load match. Use Value: 170MHz bandwidth at G = +2 and 4.0Ω inverting input resistance prevent peaking and preserve filter group delay. |
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 AC/DC specs per channel, same SO-8 package; 3.4mA total IQ vs 6.8mA for quad | Better suited for space-constrained dual-channel designs where full quad density isn't required | Select OPA2684IDR when board area or power budget favors two independent channels over four |
| OPA691U | Higher slew rate (1800V/µs), higher bandwidth (>500MHz), but 5.5mA/ch IQ and SO-8 package | Targeted at >100MHz RF/IF signal chains where distortion floor is secondary to speed | Choose OPA691U only when bandwidth >300MHz is mandatory and power/per-channel is not constrained |
Compared with OPA2684IDR, OPA4684IDG4 provides 2× channel count in same footprint-per-channel but draws 3.4mA more total supply current; versus OPA691U, it trades 3× bandwidth for 3.2× lower power and guaranteed video-grade distortion performance.
Availability
OPA4684IDG4 is available at Aetrix Electronics and suitable for broadcast video infrastructure, high-speed data acquisition, and multichannel test equipment requiring stable component supply with guaranteed long-term availability and TI-authorized traceability.
Supply support for OPA4684IDG4 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 signal chain solutions.
The OPA4684IDG4 belongs to TI's CFBPLUS current-feedback op amp family, designed specifically for low-power, wideband video, communications, and instrumentation applications where gain-flat bandwidth and low distortion are critical.
FAQ
What is the maximum operating temperature range for the OPA4684IDG4?
The OPA4684IDG4 is specified from –40°C to +85°C ambient temperature. Its thermal resistance θJA is 100°C/W in the SO-14 (D) package, allowing full 120mA output current per channel without derating within this range. Junction temperature must remain ≤+150°C under all operating conditions.
Can the OPA4684IDG4 operate from a single +5V supply?
Yes, the OPA4684IDG4 supports single +5V operation with verified performance: 110MHz small-signal bandwidth at G = +2, 3VPP output swing into 100Ω, and 70mA sourcing capability. Input common-mode range extends from 1.25V to 3.75V, requiring external biasing (e.g., resistive divider) for AC-coupled signals.
What is the recommended feedback resistor value for G = +2 in dual-supply configuration?
The datasheet specifies RF = 800Ω for G = +2 with ±5V supplies to achieve optimal bandwidth flatness and minimal peaking. This value is validated across temperature and process corners; deviating significantly (e.g., >±20%) degrades 0.1dB gain flatness and increases harmonic distortion at 5MHz.
How does the OPA4684IDG4 handle crosstalk between channels?
The OPA4684IDG4 achieves –52dB input-referred crosstalk at 5MHz when three channels drive 1VPP into 100Ω loads. This is enabled by substrate isolation and independent output stages in the SO-14 package. Crosstalk remains below –45dB up to 100MHz, making it suitable for simultaneous multichannel video routing.
Is the OPA4684IDG4 pin-compatible with other TI quad CFB amplifiers?
No, the OPA4684IDG4 is not pin-compatible with earlier TI quad CFB amplifiers like the OPA3691 or OPA3684. Its SO-14 pinout follows a unique channel mapping (A/B/C/D inputs/outputs distributed across pins 1–14), and its internal CFBPLUS architecture requires different external compensation than legacy parts.
OPA4684IDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
OPA4684IDG4 FAQ
1.How can I place an order for OPA4684IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4684IDG4 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 OPA4684IDG4 reliable?
The price and inventory of OPA4684IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4684IDG4 is usually 5 days.
3.What payment methods are accepted for OPA4684IDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4684IDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4684IDG4?
OPA4684IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4684IDG4 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 OPA4684IDG4?
For technical support, including OPA4684IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4684IDG4 requirements.
6.How does Aetrix verify that OPA4684IDG4 is sourced from the original manufacturer or authorized distributors?
All OPA4684IDG4 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 OPA4684IDG4 meets industry standards.
7.What is the process for return or replacement of OPA4684IDG4?
All OPA4684IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4684IDG4, 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 OPA4684IDG4 part is unused and in its original packaging.
Return procedure for OPA4684IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA4684IDG4 Tags
-
LM358DT
STMicroelectronics
-
LM358DR
Texas Instruments
-
LM2904DR
Texas Instruments
-
LM358ADR
Texas Instruments
-
LM2904DGKR
Texas Instruments
-
LM324DR
Texas Instruments
-
MCP6006T-E/OT
Microchip Technology
-
MCP6006UT-E/OT
Microchip Technology
-
LM324PWR
Texas Instruments
-
LM2902PWR
Texas Instruments
-
LM2902DR
Texas Instruments
-
LM358P
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
