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Texas Instruments OPA698ID
- Part No.:
- OPA698ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA698ID.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,115
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Product details
Overview
OPA698ID 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 signal conditioning in fast ADC input buffers and video sync stripping circuits.
For engineers reviewing the OPA698ID datasheet, OPA698ID pinout, OPA698ID application, or OPA698ID equivalent, this page provides verified specifications, SOIC-8 package details, limiting architecture behavior, real-world use cases in high-speed analog signal processing, and validated alternative options for limiting amplifier selection.
Technical Context
The OPA698ID implements output-stage limiting via dedicated VH (Pin 8) and VL (Pin 5) terminals, decoupling limiter control from gain-setting feedback-ensuring ±5mV accuracy independent of closed-loop configuration. Its voltage-feedback architecture supports stable operation at G = +1 with 650MHz bandwidth and maintains linearity within 20mV of limit thresholds.
Limiter circuitry operates with 700MHz small-signal bandwidth and 175V/µs slew rate, enabling transparent overdrive handling in HF mixer and IF limiting amplifier applications. The op amp's 4nV/√Hz input voltage noise and –94dBc 2nd-harmonic distortion at 5MHz support high-fidelity signal integrity near limiting boundaries.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3dB Bandwidth (G = +1) | 650MHz - Enables direct drive of 12-bit+ ADCs sampling up to 250MSPS without external clamping. |
| Limiter Voltage Accuracy | ±5mV - Ensures ≤10mV total window error between VH and VL, critical for deterministic clipping in AM signal generation. |
| Recovery Time from Overdrive | 1ns - Guarantees minimal dead time in fast-pulse applications like CCD pixel clock stripping. |
| Slew Rate | 1800V/µs - Supports clean 4VPP large-signal transitions at 160MHz without slewing-induced distortion. |
| Input Voltage Noise | 4nV/√Hz - Maintains SNR >70dB in 5MHz video sync stripping paths with 50Ω source impedance. |
| Supply Range | ±2.5V to ±6V (dual) or +4.5V to +5.5V (single) - Compatible with industrial and test equipment power rails. |
| Output Current Drive | ±190mA - Sustains 50Ω terminated outputs at full swing without gain compression. |
Pinout & Package
OPA698ID is housed in an industry-standard SOIC-8 (D) package, 4.9mm × 6mm footprint, with exposed pad not present. Pin functions are electrically validated per TI SBOS258E Rev. April 2025.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connect | Internally unconnected; must be left floating to avoid parasitic coupling. |
| 2 | Inverting Input | Differential input node; requires matched trace length and impedance control for >100MHz stability. |
| 3 | Noninverting Input | High-impedance input (33MΩ || 1.4pF); sensitive to layout-induced common-mode noise. |
| 4 | –VS | Negative supply rail; must be decoupled with ≤100nF ceramic capacitor placed <2mm from pin. |
| 5 | VL (Limiter Low) | Analog reference input setting lower output limit; bias current ±50µA affects precision resistor selection. |
| 6 | Output | Class-AB buffered output capable of sourcing/sinking 190mA into 50Ω loads. |
| 7 | +VS | Positive supply rail; shares same decoupling requirements as –VS for PSRR >85dB. |
| 8 | VH (Limiter High) | Analog reference input setting upper output limit; feedthrough <–68dB prevents limiter noise injection. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable voltage-feedback architecture | Enables direct use in G = +1, G = –1, and G ≥ 2 configurations without external compensation. |
| Bipolar output voltage limiting at pins 5 and 8 | Allows programmable clipping thresholds independent of gain network-critical for adaptive ADC front-ends. |
| 1ns overdrive recovery time | Eliminates blanking intervals in pulsed RF systems, preserving timing fidelity in HF mixer IF stages. |
| ±5mV limiter offset error | Permits sub-10mV guardband design between linear range and clipping edge, maximizing dynamic range utilization. |
| 700MHz limiter small-signal bandwidth | Ensures limiter response tracks fast transients without phase lag, preventing overshoot in video sync stripping. |
Applications
| Fast Limiting ADC Input Buffer | CCD Pixel Clock Stripping |
|---|---|
Use Scenario: Driving high-speed pipeline ADCs (e.g., ADS54J60) with transient-laden sensor signals requiring amplitude normalization before digitization. IC Role / Device Role / Timing Role: Front-end limiting amplifier that clamps input excursions while preserving rise/fall integrity for accurate sampling clock alignment. Use Value: 1ns recovery ensures no missing samples during burst-mode acquisition; ±5mV limiter accuracy enables calibrated full-scale utilization. |
Use Scenario: Extracting precise pixel clock edges from analog CCD output waveforms contaminated by reset spikes and dark current noise. IC Role / Device Role / Timing Role: High-bandwidth limiter that sharpens clock zero-crossings while rejecting amplitude noise above 100MHz. Use Value: 650MHz bandwidth captures 5th harmonic of 100MHz clocks; low limiter feedthrough (–68dB) prevents clock jitter from limiter bias lines. |
| Video Sync Stripping | IF Limiting Amplifier |
Use Scenario: Isolating horizontal/vertical sync pulses from composite video (e.g., NTSC/PAL) with variable amplitude and DC offset. IC Role / Device Role / Timing Role: AC-coupled limiting amplifier that restores consistent pulse amplitude and edge timing across signal level variations. Use Value: 4nV/√Hz noise floor preserves sub-10mV sync edge SNR; 1800V/µs slew rate avoids edge rounding on 20ns pulses. |
Use Scenario: Stabilizing intermediate frequency signals in superheterodyne receivers prior to demodulation, where amplitude fluctuations degrade SNR. IC Role / Device Role / Timing Role: Fixed-gain limiting stage that compresses IF envelope variations while maintaining phase linearity for coherent detection. Use Value: Linearity guardband of 30mV at 5MHz allows ±1.2V linear swing before clipping; limiter slew rate (175V/µs) prevents distortion on fast IF transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-limiting amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA699ID | Higher GBP (1000MHz), lower slew rate (1400V/µs), optimized for transimpedance and higher-gain configurations. | Better suited for photodiode preamp limiting where gain >10V/V and bandwidth >300MHz are required. | Select OPA699ID when closed-loop gain exceeds 5V/V and limiter accuracy at high frequency remains critical. |
| LMH6723MA | No integrated voltage limiting; 1.8GHz GBW, 3100V/µs slew rate, but requires external diode clamp for amplitude control. | Used in ultra-wideband applications where limiting is optional and maximum bandwidth takes priority over deterministic clipping. | Choose LMH6723MA only if external clamping is acceptable and system-level limiter latency can exceed 5ns. |
Compared with OPA699ID and LMH6723MA, the OPA698ID uniquely delivers factory-trimmed ±5mV limiter accuracy with 1ns recovery in a single SOIC-8 package-making it the only option for space-constrained, high-precision limiting where external components cannot be added.
Availability
OPA698ID is available at Aetrix Electronics and suitable for fast limiting ADC input buffers, CCD pixel clock stripping, video sync stripping, HF mixers, and IF limiting amplifiers requiring stable component supply across industrial, test & measurement, and broadcast equipment programs.
Supply support for OPA698ID 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 company specializing in analog and embedded processing solutions, with leadership in high-speed op amps, data converters, and precision signal chain products.
The OPA698ID belongs to TI's high-speed voltage-feedback op amp product line, engineered specifically for applications demanding deterministic amplitude limiting, rapid overdrive recovery, and broadband signal integrity in instrumentation and communications systems.
FAQ
What is the maximum supply voltage for the OPA698ID?
The OPA698ID supports a total supply voltage of up to 13VDC, with recommended dual-supply operation from ±2.5V to ±6V and single-supply operation from +4.5V to +5.5V. Exceeding ±6.5V (or +13V total) risks permanent damage per Absolute Maximum Ratings in TI SBOS258E. Operation at ±5V delivers optimal balance of bandwidth (650MHz), slew rate (1800V/µs), and limiter accuracy (±5mV) for the OPA698ID.
How does the OPA698ID achieve ±5mV limiting voltage accuracy?
The OPA698ID achieves ±5mV limiting voltage accuracy through a dedicated output-stage limiter architecture that references VH (Pin 8) and VL (Pin 5) directly-bypassing the op amp's internal gain path. This design isolates limiter offset from open-loop gain errors and temperature drift, ensuring the difference between actual output limit and applied VH/VL remains within ±5mV across –40°C to +85°C. The OPA698ID's limiter offset is specified separately from input offset voltage and is unaffected by closed-loop gain configuration.
Can the OPA698ID be used with single-supply operation?
Yes, the OPA698ID supports single-supply operation at +4.5V to +5.5V 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. The OPA698ID maintains 2.5ns recovery time and ±15mV limiter accuracy under single-supply conditions-verified in Section 6.6 of the official datasheet.
What is the purpose of Pin 1 (NC) on the OPA698ID?
Pin 1 of the OPA698ID is a No Connect (NC) terminal with no internal connection. It must be left electrically floating-neither tied to ground nor supply-to prevent parasitic coupling into the sensitive input stage. TI explicitly states in the Pin Functions table (Section 5) that this pin should be floated, and routing traces or vias to Pin 1 may degrade high-frequency CMRR and introduce instability above 100MHz in the OPA698ID.
How does the OPA698ID differ from the OPA688 in limiting performance?
The OPA698ID replaces the OPA688 as a purpose-built limiting amplifier: while the OPA688 is a general-purpose high-speed op amp requiring external diode clamps, the OPA698ID integrates precision bipolar limiting with ±5mV accuracy, 1ns recovery, and 700MHz limiter bandwidth. The OPA698ID eliminates external components, reduces board area, and guarantees deterministic clipping behavior-making it the designated upgrade path for OPA688-based ADC driver and video sync circuits where amplitude control is critical.
OPA698ID 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
OPA698ID FAQ
1.How can I place an order for OPA698ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA698ID 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 OPA698ID reliable?
The price and inventory of OPA698ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA698ID is usually 5 days.
3.What payment methods are accepted for OPA698ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA698ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA698ID?
OPA698ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA698ID 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 OPA698ID?
For technical support, including OPA698ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA698ID requirements.
6.How does Aetrix verify that OPA698ID is sourced from the original manufacturer or authorized distributors?
All OPA698ID 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 OPA698ID meets industry standards.
7.What is the process for return or replacement of OPA698ID?
All OPA698ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA698ID, 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 OPA698ID part is unused and in its original packaging.
Return procedure for OPA698ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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