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Texas Instruments OPA691ID
- Part No.:
- OPA691ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA691ID.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,364
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Product details
Overview
OPA691ID from Texas Instruments is a wideband current-feedback operational amplifier with disable control, designed for high-speed analog signal conditioning. It delivers 190MHz bandwidth at G = +2, 2100V/µs slew rate, ±4.0V output swing, and 190mA output current on ±5V supplies - enabling RGB line driving and single-supply ADC input buffering in portable instrumentation and broadband video systems.
For engineers reviewing the OPA691ID datasheet, OPA691ID pinout, OPA691ID application, or OPA691ID equivalent, key selection considerations include its 5.1mA quiescent current, 150µA power-down mode, low dG/dφ (0.07%/0.02°), SO-8 package thermal resistance (125°C/W), and verified performance in +5V single-supply ADC driver and xDSL line driver configurations.
Technical Context
The OPA691ID uses a current-feedback architecture where bandwidth remains stable across gains - delivering 225MHz at G = +1 and 190MHz at G = +2 under ±5V operation. Its output stage minimizes crossover distortion while sustaining ±190mA drive into 100Ω loads, enabling rail-swing operation within 1V of either supply.
Integrated disable functionality provides <150µA shutdown current and 25ns enable time, with logic-level compatible DIS pin (enable >3.3V, disable <1.8V). Input bias currents are asymmetric (±5µA inverting, +15µA noninverting), and transimpedance gain is 225kΩ min at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +2) | 190MHz min (±5V, RL = 100Ω) - supports >100MHz video and IF signal paths |
| Slew Rate | 2100V/µs min (±5V, G = +2) - enables clean 5VPP transient response without slewing distortion |
| Output Current | ±190mA min (±5V, VO = 0) - drives 100Ω loads directly without external buffers |
| Supply Current | 5.1mA max (±5V, 25°C) - ultra-low power for high-speed amplification |
| Disable Current | 150µA max (VDIS = 0V) - reduces system standby power by >97% vs active mode |
| Differential Gain/Phase | 0.07%/0.02° typ (NTSC, RL = 150Ω) - meets broadcast-grade video fidelity requirements |
| Input Voltage Noise | 1.7nV/√Hz typ (f > 1MHz) - preserves SNR in high-gain, wideband front-ends |
Pinout & Package
OPA691ID is housed in an SO-8 (D) package with exposed pad not electrically connected. Thermal resistance θJA = 125°C/W enables operation up to +85°C ambient in standard PCB layouts with minimal copper area.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No internal connection - leave unconnected or grounded per layout best practice |
| 2 | Inverting Input (–) | Current-summing node; 35Ω input resistance sets feedback network impedance |
| 3 | Noninverting Input (+) | Voltage-sensing node; 100kΩ || 2pF input impedance minimizes loading on source |
| 4 | –VS | Negative supply rail; must be decoupled locally with 0.1µF ceramic capacitor |
| 5 | DIS | Active-low disable control; <1.5V disables output (Hi-Z), >3.3V enables normal operation |
| 6 | +VS | Positive supply rail; optional 0.1µF capacitor between +VS and –VS improves 2nd-harmonic distortion |
| 7 | Output | Class-AB output stage capable of ±190mA sourcing/sinking into 100Ω loads |
| 8 | NC | No internal connection - no routing required |
Key Features
| Feature | Design Value |
|---|---|
| Wideband +5V operation | 190MHz bandwidth at G = +2 on single +5V supply - eliminates dual-rail design complexity |
| Low-distortion output stage | 0.07%/0.02° differential gain/phase - preserves color fidelity in NTSC/PAL video paths |
| Fast enable/disable timing | 25ns enable / 400ns disable - supports sub-microsecond channel switching in multiplexed video |
| Rail-swing output capability | ±3.9V swing into 100Ω load on ±5V - maximizes dynamic range without level-shifting circuitry |
| Current-feedback architecture | Bandwidth independent of closed-loop gain - simplifies gain-scaling in multi-channel summing amps |
Applications
| RGB Line Driver | Single-Supply ADC Driver |
|---|---|
|
Use Scenario: Driving three parallel 75Ω coaxial cables from graphics controller DAC outputs in embedded displays. IC Role / Device Role / Timing Role: High-current, low-dG/dφ buffer amplifying baseband RGB signals up to 150MHz. Use Value: Delivers 190mA peak current and 0.07%/0.02° differential gain/phase error to maintain color accuracy across full HD resolution. |
Use Scenario: Conditioning analog sensor signals before digitization in portable test equipment using ADS8xx-series ADCs. IC Role / Device Role / Timing Role: Single-supply +5V input driver providing >180MHz bandwidth and >58dBc SFDR at 20MHz input. Use Value: Enables direct interface to 60MSPS ADCs without level-shifting or negative supply rails, reducing BOM count by two regulators. |
| xDSL Line Driver | Widewidth Inverting Summing Amplifier |
|
Use Scenario: Transmitting upstream/downstream DSL signals over twisted-pair lines in CPE modems. IC Role / Device Role / Timing Role: High-output-power line driver operating in Class-A/B with 190mA drive capability and 190MHz small-signal BW. Use Value: Meets ITU-T G.992.1 spectral mask requirements up to 1.1MHz with <–70dBc harmonic distortion at 5MHz. |
Use Scenario: Combining five RF inputs (e.g., 50Ω sources) into one broadband IF output in spectrum analyzers. IC Role / Device Role / Timing Role: Inverting summing amplifier with NG = 6 and >200MHz small-signal bandwidth. Use Value: Achieves –1dB compression at 15dBm into 50Ω load while maintaining matched 50Ω input impedances across all channels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA691IDBV | SOT-23-6 package (DBV), same electrical specs, higher θJA (150°C/W) | Space-constrained PCBs requiring <2mm² footprint; lower thermal mass limits continuous 190mA output | Select OPA691IDBV only when board area is critical and average output current ≤120mA |
| OPA2691ID | Dual-channel version in SO-8; identical per-channel AC/DC specs but shared supply pins | Two independent high-speed channels needed (e.g., differential ADC driver or dual video path) | Choose OPA2691ID when dual-channel operation justifies 2× quiescent current (10.2mA) and shared thermal path |
Compared with OPA691IDBV and OPA2691ID, the OPA691ID offers optimal thermal performance (125°C/W) and dedicated single-channel optimization - making it preferred for sustained 190mA output, precision video buffering, and applications requiring independent supply decoupling per channel.
Availability
OPA691ID is available at Aetrix Electronics and suitable for RGB line driving, single-supply ADC interfacing, and xDSL line driver applications requiring stable component supply, long-term production continuity, and TI-qualified automotive-grade traceability.
Supply support for OPA691ID 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 over 50 years of op amp innovation and manufacturing excellence.
The OPA691ID belongs to TI's high-speed current-feedback op amp product line, engineered specifically for broadband signal conditioning in video, communications, and test equipment where bandwidth, linearity, and power efficiency are co-critical.
FAQ
What is the maximum operating voltage for the OPA691ID?
The OPA691ID supports a maximum operating voltage of ±6V (dual supply) or +12V (single supply), with absolute maximum ratings limiting supply pins to ±6.5VDC. Operation beyond these voltages risks permanent damage. The device is fully specified from ±2.5V to ±6V dual supply or +4V to +12V single supply, with optimal performance at ±5V or +5V.
Does the OPA691ID require external compensation for stability?
No, the OPA691ID is unity-gain stable with a guaranteed 280MHz bandwidth at G = +1. It does not require external compensation components for standard configurations. Stability is maintained across gains due to its current-feedback architecture - unlike voltage-feedback op amps, bandwidth remains largely independent of closed-loop gain setting.
How does the disable function behave during power-up?
During power-up, the OPA691ID enters normal operation if the DIS pin is left open or pulled above 3.3V. If DIS is held low (<1.5V) during startup, the output remains in high-impedance state until DIS rises above the enable threshold. No power-up sequencing is required, but ensure DIS settles before enabling signal paths to avoid turn-on glitches up to ±50mV.
Can the OPA691ID drive a 50Ω load directly?
Yes, the OPA691ID can drive a 50Ω load directly with ±190mA output current capability. At ±5V supply, it delivers ±3.6V swing into 50Ω (min), supporting >150MHz bandwidth. For optimal 50Ω matching, use series output resistor (e.g., 25Ω) to isolate capacitive load effects and maintain flat frequency response up to 200MHz.
What is the thermal performance difference between OPA691ID and OPA691IDBV?
The OPA691ID (SO-8) has θJA = 125°C/W, while OPA691IDBV (SOT-23-6) has θJA = 150°C/W - a 20% higher thermal resistance. Under identical 190mA continuous output, the SO-8 package runs ~10°C cooler. This makes OPA691ID preferable for sustained high-current operation, whereas OPA691IDBV suits intermittent or lower-average-power applications where board space is constrained.
OPA691ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2100V/µs
- Gain Bandwidth Product:
- 2 GHz
- -3db Bandwidth:
- 280 MHz
- Current - Input Bias:
- 15 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 5.1mA
- Current - Output / Channel:
- 190 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
OPA691ID FAQ
1.How can I place an order for OPA691ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA691ID 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 OPA691ID reliable?
The price and inventory of OPA691ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA691ID is usually 5 days.
3.What payment methods are accepted for OPA691ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA691ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA691ID?
OPA691ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA691ID 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 OPA691ID?
For technical support, including OPA691ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA691ID requirements.
6.How does Aetrix verify that OPA691ID is sourced from the original manufacturer or authorized distributors?
All OPA691ID 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 OPA691ID meets industry standards.
7.What is the process for return or replacement of OPA691ID?
All OPA691ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA691ID, 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 OPA691ID part is unused and in its original packaging.
Return procedure for OPA691ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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