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Texas Instruments OPA698IDG4
- Part No.:
- OPA698IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA698IDG4.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,565
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Product details
Overview
OPA698IDG4 from Texas Instruments is a unity-gain stable, wideband voltage-feedback operational amplifier with integrated bipolar output voltage limiting. It delivers ±5mV limiting voltage accuracy, 650MHz small-signal bandwidth at G = +1, 1800V/µs slew rate, and 1ns recovery from overdrive-enabling precise, high-speed signal conditioning in ADC input buffers and video sync stripping applications.
For engineers reviewing the OPA698IDG4 datasheet, OPA698IDG4 pinout, OPA698IDG4 application, or OPA698IDG4 equivalent, key selection criteria include limiting offset tolerance, overdrive recovery time, gain-bandwidth trade-offs at ±5V vs 5V supply, and SOIC-8 thermal performance under fast transient loads.
Technical Context
The OPA698IDG4 implements output-stage limiting via dedicated VH (Pin 8) and VL (Pin 5) terminals, decoupling limiter control from op-amp gain configuration-ensuring ±5mV limiting accuracy across all closed-loop gains. Its voltage-feedback architecture supports stable unity-gain operation while maintaining 300MHz gain-bandwidth product and 4nV/√Hz input voltage noise above 1MHz.
Limiter functionality operates independently of the core amplifier: limiter small-signal bandwidth reaches 700MHz (±5V), feedthrough is –68dB at 5MHz, and limiter slew rate is 175V/µs-enabling transparent overdrive handling without degrading signal integrity in HF mixer or IF limiting amplifier roles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3dB Bandwidth (G = +1) | 650MHz - supports full-swing analog signals up to UHF without gain peaking or phase degradation |
| Limiting Voltage Accuracy | ±5mV - enables sub-10mV guardband between linear range and clipping threshold for high-SFDR systems |
| Recovery Time from Overdrive | 1ns - ensures minimal dead time in burst-mode or pulse-based ADC front-ends |
| Slew Rate | 1800V/µs - sustains 4V step fidelity within 2.2ns, critical for fast-rising video or radar pulses |
| Gain Bandwidth Product | 300MHz - defines maximum stable closed-loop bandwidth at G ≥ 5 (e.g., 60MHz at G = 5) |
| Input Voltage Noise | 4nV/√Hz (>1MHz) - preserves SNR in wideband receiver chains where noise dominates at RF/IF frequencies |
| Supply Range | ±2.5V to ±6V or single 5V - supports dual-rail precision systems and low-voltage embedded designs |
Pinout & Package
OPA698IDG4 is housed in an industry-standard SOIC-8 (D package), 4.9mm × 6mm body size with standard lead pitch and thermal pad compatibility. The package supports JEDEC MS-012AC footprint and provides 118°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - must be left floating; not tied to ground or supply |
| 2 | Inverting Input | Differential input node for feedback network attachment; high-impedance (1MΩ || 0.3pF) |
| 3 | Noninverting Input | Differential input node for signal reference; common-mode range extends to ±3.3V (±5V supply) |
| 4 | –VS | Negative supply rail - sets lower limit for internal biasing and output swing |
| 5 | VL | Limiter low reference - defines lower bound of output voltage clamp; sinks 40–60µA bias current |
| 6 | Output | Buffered output stage with 0.01Ω closed-loop impedance below 100kHz |
| 7 | +VS | Positive supply rail - sets upper limit for internal biasing and output swing |
| 8 | VH | Limiter high reference - defines upper bound of output voltage clamp; sources 40–60µA bias current |
Key Features
| Feature | Design Value |
|---|---|
| Output limiting architecture | Independent VH/VL control pins enable gain-agnostic clamping with ±5mV offset error |
| Fast overdrive recovery | 1ns transition from saturated to linear operation preserves timing integrity in burst-mode sampling |
| High linearity near limits | 30mV linearity guardband at 5MHz allows limiter thresholds within 100mV of desired signal range |
| Low limiter feedthrough | –68dB (±5V) prevents limiter voltage modulation from corrupting output signal fidelity |
| Wide supply flexibility | Operates on ±5V or +5V with <1% quiescent current variation (13.8–17.3mA) |
Applications
| Fast Limiting ADC Input Buffer | Video Sync Stripping |
|---|---|
Use Scenario: Protecting high-speed ADC inputs from overvoltage transients during signal acquisition in oscilloscopes or software-defined radios. IC Role / Device Role / Timing Role: Unity-gain buffer with programmable output clamping; maintains signal edge fidelity while preventing ADC saturation. Use Value: 1ns recovery eliminates blanking intervals; ±5mV limiting accuracy ensures consistent full-scale utilization across temperature. | Use Scenario: Extracting horizontal/vertical sync pulses from composite video signals in broadcast equipment or medical imaging displays. IC Role / Device Role / Timing Role: High-bandwidth limiting amplifier that clips analog video envelope while preserving sharp sync transitions. Use Value: 650MHz bandwidth captures sub-ns sync edges; low limiter feedthrough avoids ghosting or timing jitter in extracted pulses. |
| CCD Pixel Clock Stripping | IF Limiting Amplifier |
Use Scenario: Isolating pixel clock timing from CCD analog output in scientific cameras or machine vision sensors. IC Role / Device Role / Timing Role: Fast-recovering limiter that suppresses video content while passing clean clock harmonics. Use Value: 700MHz limiter bandwidth passes 10th harmonic of 50MHz clocks; 1.4ns rise/fall time preserves clock edge monotonicity. | Use Scenario: Stabilizing IF signal amplitude prior to demodulation in spectrum analyzers or RF test equipment. IC Role / Device Role / Timing Role: Gain-stable limiting amplifier in 10–200MHz IF chains, rejecting amplitude variations without distorting phase. Use Value: 300MHz GBW supports flat group delay; ±5mV limiter accuracy enables precise AGC setpoint control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA699IDG4 | Higher 1000MHz GBW but lower 1400V/µs slew rate; optimized for transimpedance and higher-gain configurations | Preferred for photodiode TIA designs requiring >20V/V gain with output limiting; less suitable for unity-gain ADC buffering | Select OPA699IDG4 when gain ≥ 10V/V is required and 1ns recovery is secondary to bandwidth |
| LMH6723MA/NOPB | No integrated limiting; 1.8GHz GBW, 3100V/µs slew, but requires external clamping diodes and suffers >10ns recovery | Used where ultimate speed is prioritized over deterministic limiting accuracy or recovery time | Choose LMH6723MA/NOPB only when external limiter design is acceptable and 1ns recovery is not mandatory |
Compared with OPA699IDG4 and LMH6723MA/NOPB, the OPA698IDG4 uniquely balances sub-ns recovery, ±5mV limiting precision, and unity-gain stability-making it the sole option for high-fidelity, gain-flexible limiting in ADC front-ends and video timing extraction.
Availability
OPA698IDG4 is available at Aetrix Electronics and suitable for fast limiting ADC input buffers, video sync stripping, CCD pixel clock extraction, and IF limiting amplifier applications requiring stable component supply, traceable sourcing, and long-term production continuity.
Supply support for OPA698IDG4 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 delivering analog and embedded processing solutions, with over 50 years of op amp innovation and broad application-specific portfolio depth.
The OPA698IDG4 belongs to TI's high-speed precision op amp product line, engineered specifically for wideband signal conditioning where deterministic output limiting, rapid overdrive recovery, and gain-agnostic clamping accuracy are system-critical requirements.
FAQ
What is the maximum supply voltage rating for the OPA698IDG4?
The OPA698IDG4 has an absolute maximum total supply voltage of 13VDC. This allows operation from ±6V supplies (12V total) or single 5V supplies with margin. Exceeding 13V risks permanent damage per TI's Absolute Maximum Ratings table. For reliable long-term use, TI recommends staying within ±6V or +5V operating conditions.
How does the OPA698IDG4 achieve ±5mV limiting voltage accuracy?
The OPA698IDG4 achieves ±5mV limiting voltage accuracy through a dedicated output-limiting architecture that separates limiter control from the main amplifier path. The VH and VL pins directly bias internal clamp circuitry, minimizing offset contributions from op-amp input stages. This architecture holds limiter offset error to ±5mV across temperature and supply variations, as verified in Section 6.5 of the SBOS258E datasheet.
Can the OPA698IDG4 operate from a single +5V supply?
Yes, the OPA698IDG4 supports single +5V supply operation with midsupply (2.5V) referenced inputs and outputs. In this configuration, typical small-signal bandwidth is 550MHz (G = +1), slew rate is 820V/µs, and limiter voltages default to VCM ±0.8V when pins 5 and 8 are open. Full specifications for +5V operation are provided in Section 6.6 of the SBOS258E datasheet.
What is the thermal resistance of the OPA698IDG4 in SOIC-8 package?
The OPA698IDG4 in SOIC-8 (D) package has a junction-to-ambient thermal resistance (RθJA) of 118°C/W, a junction-to-board thermal resistance (RθJB) of 64.9°C/W, and a junction-to-case (top) thermal resistance (RθJC(top)) of 63.3°C/W. These values assume standard JEDEC 2-layer board layout per Section 6.4 of the SBOS258E datasheet.
Does the OPA698IDG4 require external compensation for unity-gain stability?
No, the OPA698IDG4 is internally compensated for unity-gain stability. It remains stable with closed-loop gains ≥ +1 without external compensation components. This is confirmed by its specified 650MHz small-signal bandwidth at G = +1 and absence of recommended compensation networks in the datasheet's Application and Implementation section.
OPA698IDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1100V/µs
- Gain Bandwidth Product:
- 250 MHz
- -3db Bandwidth:
- 450 MHz
- Current - Input Bias:
- 3 µA
- Voltage - Input Offset:
- 2 mV
- Current - Supply:
- 15.5mA
- Current - Output / Channel:
- 120 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
OPA698IDG4 FAQ
1.How can I place an order for OPA698IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA698IDG4 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 OPA698IDG4 reliable?
The price and inventory of OPA698IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA698IDG4 is usually 5 days.
3.What payment methods are accepted for OPA698IDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA698IDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA698IDG4?
OPA698IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA698IDG4 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 OPA698IDG4?
For technical support, including OPA698IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA698IDG4 requirements.
6.How does Aetrix verify that OPA698IDG4 is sourced from the original manufacturer or authorized distributors?
All OPA698IDG4 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 OPA698IDG4 meets industry standards.
7.What is the process for return or replacement of OPA698IDG4?
All OPA698IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA698IDG4, 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 OPA698IDG4 part is unused and in its original packaging.
Return procedure for OPA698IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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