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Texas Instruments OPA698IDRG4
- Part No.:
- OPA698IDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA698IDRG4.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,844
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Product details
Overview
OPA698IDRG4 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, and 1ns recovery from overdrive-enabling precise, high-speed signal conditioning in ADC input buffers and video sync stripping applications.
For engineers reviewing the OPA698IDRG4 datasheet, OPA698IDRG4 pinout, OPA698IDRG4 application, or OPA698IDRG4 equivalent, key selection criteria include limiting offset tolerance, recovery time under overdrive, gain-flatness bandwidth, supply flexibility (±5V or +5V), and SOIC-8 compatibility for high-density analog front-end layouts.
Technical Context
The OPA698IDRG4 implements output-stage limiting via dedicated VH (Pin 8) and VL (Pin 5) terminals, decoupling limiter accuracy from closed-loop gain configuration. Its voltage-feedback architecture supports stable operation at G = +1 while maintaining 300MHz gain-bandwidth product and 1800V/µs slew rate under ±5V supplies.
Limiter functionality operates independently of op-amp core biasing: limiter feedthrough is –68dB at 5MHz, small-signal limiter bandwidth reaches 700MHz, and linearity guardband is 30mV-ensuring minimal distortion within 20mV of limit thresholds and enabling tight placement of linear range relative to clipping boundaries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3dB Bandwidth (G = +1) | 650MHz - Enables full-power response up to UHF for fast pulse and video signals. |
| Limiting Voltage Accuracy | ±5mV - Ensures predictable clipping thresholds across temperature and supply variations. |
| Overdrive Recovery Time | 1ns - Guarantees sub-nanosecond return to linear operation after transient overload. |
| Slew Rate | 1800V/µs - Supports large-signal settling without slewing-induced distortion in 160MHz large-signal bandwidth. |
| Gain Bandwidth Product | 300MHz - Maintains usable bandwidth at higher gains (e.g., 215MHz at G = 2V/V). |
| Input Voltage Noise | 4nV/√Hz - Low noise floor preserves SNR in sensitive ADC driver and IF amplifier stages. |
| Supply Range | ±2.5V to ±6V or +5V single-ended - Compatible with legacy ±5V systems and modern low-voltage mixed-signal rails. |
Pinout & Package
OPA698IDRG4 is housed in an industry-standard SOIC-8 (D package), 4.9mm × 6mm footprint with gull-wing leads. Pin 1 is NC (no internal connection); Pins 5 and 8 are dedicated limiter inputs (VL and VH), enabling externally programmable clipping thresholds independent of gain configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection | Must be left floating; no internal circuitry attached. |
| 2 | Inverting Input | Differential input node for inverting configurations; supports standard feedback networks. |
| 3 | Noninverting Input | Differential input node for noninverting configurations; referenced to midsupply in single-supply operation. |
| 4 | –VS | Negative supply rail; must be connected for bipolar operation or grounded for single-supply use. |
| 5 | VL (Limiter Low) | Set lower output limit voltage; bias current ±40–60µA; accuracy ±5mV at ±5V supply. |
| 6 | Output | Amplified and limited output; drives 500Ω load to ±3.9V swing with <0.01Ω closed-loop impedance. |
| 7 | +VS | Positive supply rail; supports ±5V or +5V operation with 13.8–17.3mA quiescent current. |
| 8 | VH (Limiter High) | Set upper output limit voltage; complementary to VL; enables symmetric or asymmetric limiting. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability with limiting | Operates stably at G = +1 while preserving ±5mV limiter accuracy-unlike conventional clamping circuits that degrade with gain. |
| Fast limiter recovery | 1ns recovery ensures overdrive transients do not corrupt subsequent signal cycles in high-repetition-rate sampling. |
| Programmable output limits | VH and VL pins accept external DC voltages (±4.3V max), allowing dynamic range tailoring without changing PCB layout. |
| High linearity near limits | 30mV linearity guardband at 5MHz means usable linear output extends within 30mV of clipping thresholds-maximizing dynamic range. |
| Low limiter feedthrough | –68dB feedthrough at 5MHz prevents limiter control signals from coupling into the output path and corrupting signal integrity. |
Applications
| Fast Limiting ADC Input Buffer | CCD Pixel Clock Stripping |
|---|---|
Use Scenario: Driving high-speed SAR or pipeline ADCs where input overvoltage must be prevented without sacrificing bandwidth or introducing recovery delay. IC Role / Device Role / Timing Role: Precision voltage-limiting buffer placed directly before ADC input to clamp transients while preserving signal fidelity and timing alignment. Use Value: Eliminates need for external diode clamps or slower active limiters, reducing component count and avoiding 10–100ns recovery delays that cause missing codes or aperture jitter. | Use Scenario: Extracting pixel clock timing from analog CCD video outputs contaminated by burst noise and amplitude variation. IC Role / Device Role / Timing Role: High-bandwidth limiting amplifier that sharpens clock edges by clipping noise peaks while preserving zero-crossing accuracy. Use Value: Delivers clean, jitter-controlled clock edges with <1ns overdrive recovery-critical for sub-pixel timing alignment in industrial imaging systems. |
| Video Sync Stripping | IF Limiting Amplifier |
Use Scenario: Isolating horizontal/vertical sync pulses from composite video signals with variable amplitude and superimposed noise. IC Role / Device Role / Timing Role: Wideband limiting amplifier configured as a threshold detector with precise, temperature-stable clipping levels. Use Value: Achieves ±5mV limiting accuracy across –40°C to +85°C, ensuring consistent sync pulse timing regardless of ambient conditions or supply drift. | Use Scenario: Stabilizing intermediate frequency signals in RF receivers prior to demodulation, where amplitude fluctuations degrade SNR. IC Role / Device Role / Timing Role: Constant-envelope amplifier that converts variable-amplitude IF signals into fixed-level outputs for envelope-independent detection. Use Value: Provides 700MHz limiter bandwidth and 1ns recovery-preserving phase coherence and minimizing group delay distortion in narrowband IF chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA699IDRG4 | Higher GBP (1000MHz), lower slew rate (1400V/µs), optimized for transimpedance and high-gain configurations. | Better suited for photodiode TIA designs requiring >20V/V gain with output limiting; less optimal for unity-gain ADC buffering. | Select OPA699IDRG4 when gain ≥ 5V/V and bandwidth >300MHz are required; retain OPA698IDRG4 for G = +1 stability and fastest recovery. |
| LMH6723MA/NOPB | No integrated limiting; 1.8GHz GBW, 3000V/µs slew, but requires external clamping circuitry for overvoltage protection. | Used where raw speed dominates over integrated protection-e.g., test equipment front-ends with discrete limiter design control. | Choose LMH6723MA/NOPB only if external limiter implementation is acceptable and >650MHz bandwidth is mandatory; OPA698IDRG4 reduces BOM and layout complexity. |
Compared with OPA699IDRG4 and LMH6723MA/NOPB, the OPA698IDRG4 uniquely combines unity-gain stability, ±5mV limiting accuracy, and 1ns recovery-making it the only drop-in solution for high-fidelity, low-latency limiting in G = +1 ADC driver and video timing applications.
Availability
OPA698IDRG4 is available at Aetrix Electronics and suitable for fast limiting ADC input buffers, CCD pixel clock stripping, and video sync stripping applications requiring stable component supply, guaranteed traceability, and long-term industrial lifecycle support.
Supply support for OPA698IDRG4 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-speed op amps and precision signal chain solutions.
The OPA698IDRG4 belongs to TI's OPA high-speed amplifier family, engineered specifically for applications demanding simultaneous wide bandwidth, precise output limiting, and rapid overdrive recovery-such as data acquisition front-ends and broadcast video signal conditioning.
FAQ
What is the maximum allowable limiter voltage range for OPA698IDRG4?
The OPA698IDRG4 supports a maximum limiter voltage range of ±4.3V when operating on ±5V supplies. This corresponds to VH – VL ≥ 400mV minimum separation, with absolute limits constrained by (±VS – 0.7V). At +5V single supply, limiter range is VCM ±1.8V. Exceeding these ranges risks degraded limiting accuracy or device stress.
Does OPA698IDRG4 require external compensation for unity-gain stability?
No, the OPA698IDRG4 is internally compensated for unity-gain stability. It achieves stable operation at G = +1 with 650MHz bandwidth and <1.5dB peaking, eliminating the need for external compensation components. This simplifies layout and ensures consistent performance across production units without tuning.
How does limiter feedthrough affect signal integrity in OPA698IDRG4?
Limiter feedthrough in the OPA698IDRG4 is –68dB at 5MHz, meaning any AC signal injected onto VH or VL pins couples to the output at ≤0.04% amplitude. This low feedthrough preserves signal purity in precision applications like ADC buffering, where limiter control lines must remain electrically quiet relative to the signal path.
Can OPA698IDRG4 operate from a single +5V supply?
Yes, the OPA698IDRG4 supports single +5V operation with input and output referenced to midsupply (2.5V). In this mode, VL and VH are set relative to VCM (e.g., VL = VCM – 1.2V, VH = VCM + 1.2V), delivering 1.1V to 3.9V output swing and 550MHz small-signal bandwidth-ideal for modern low-voltage imaging and data acquisition systems.
What is the thermal resistance of OPA698IDRG4 in SOIC-8 package?
The OPA698IDRG4 in SOIC-8 (D package) has a junction-to-ambient thermal resistance (RθJA) of 118°C/W. With 15.5mA typical quiescent current at ±5V, power dissipation is ~155mW, resulting in ~18°C junction-to-ambient rise at room temperature-well within the 150°C maximum junction temperature limit under standard PCB copper area.
OPA698IDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
OPA698IDRG4 FAQ
1.How can I place an order for OPA698IDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA698IDRG4 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 OPA698IDRG4 reliable?
The price and inventory of OPA698IDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA698IDRG4 is usually 5 days.
3.What payment methods are accepted for OPA698IDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA698IDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA698IDRG4?
OPA698IDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA698IDRG4 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 OPA698IDRG4?
For technical support, including OPA698IDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA698IDRG4 requirements.
6.How does Aetrix verify that OPA698IDRG4 is sourced from the original manufacturer or authorized distributors?
All OPA698IDRG4 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 OPA698IDRG4 meets industry standards.
7.What is the process for return or replacement of OPA698IDRG4?
All OPA698IDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA698IDRG4, 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 OPA698IDRG4 part is unused and in its original packaging.
Return procedure for OPA698IDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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