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Texas Instruments OPA691IDR
- Part No.:
- OPA691IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA691IDR.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,070
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Product details
Overview
OPA691IDR 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 OPA691IDR datasheet, OPA691IDR pinout, OPA691IDR application, or OPA691IDR equivalent, key selection criteria include its 5.1mA quiescent current, 150µA disabled supply current, low dG/dφ (0.07%/0.02°), unity-gain stability (280MHz), and SO-8 package compatibility with high-density PCB layouts.
Technical Context
The OPA691IDR uses a current-feedback architecture where bandwidth remains stable across gains - unlike voltage-feedback op amps - enabling consistent 190MHz small-signal bandwidth at G = +2 and 225MHz at G = +1 on ±5V supplies. Its output stage minimizes crossover distortion while delivering ±190mA into 100Ω loads with only 1V headroom to each rail.
Integrated disable functionality allows active-low control (VDIS < 1.5V) to reduce supply current to ≤150µA and place the output in high-impedance state within 400ns, supporting power-gated signal routing in multi-channel video multiplexers and battery-powered test equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +2) | 190MHz min at ±5V - supports >100MHz video baseband and IF amplification without gain-dependent bandwidth roll-off. |
| Slew Rate | 2100V/µs min - enables clean 5VPP transient response in <2ns, critical for fast-settling ADC drivers and pulse applications. |
| Output Current (Sourcing/Sinking) | ±190mA min - drives 100Ω loads directly without external buffers, reducing component count in line-driver designs. |
| Differential Gain/Phase | 0.07%/0.02° typ at NTSC - meets broadcast-grade video fidelity requirements for RGB and composite video paths. |
| Supply Current (Active) | 5.1mA max at ±5V - achieves high performance with ultra-low static power, ideal for thermally constrained portable instruments. |
| Disable Current | ≤150µA max - cuts system power by >97% during idle periods, extending battery life in handheld test gear. |
| Input Voltage Noise | 1.7nV/√Hz typ above 1MHz - preserves SNR in wideband receiver front-ends and IF amplifiers up to 200MHz. |
Pinout & Package
OPA691IDR is packaged in an SO-8 (D) surface-mount package with exposed pad thermal enhancement, rated for –40°C to +85°C operation and compatible with standard reflow profiles.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | No Connection | Internally unconnected; must be left floating or tied to ground per layout best practices. |
| 2 | Inverting Input (–) | Current-summing node for feedback network; requires matched impedance (e.g., 402Ω) to maintain bandwidth flatness. |
| 3 | Noninverting Input (+) | High-impedance input (100kΩ || 2pF); bias current ≤45µA ensures minimal DC error in precision gain stages. |
| 4 | –VS | Negative supply pin; decoupling capacitor (0.1µF) required adjacent to pin for stability at >100MHz. |
| 5 | DIS | Active-low disable control; pulls output to Hi-Z and reduces IQ to ≤150µA when driven <1.5V. |
| 6 | +VS | Positive supply pin; accepts +5V to +12V single or ±2.5V to ±6V dual supply; 0.1µF inter-rail capacitor improves 2nd-harmonic distortion. |
| 7 | Output | Capable of ±190mA drive into 100Ω; closed-loop output impedance is 0.03Ω at 100kHz - suitable for direct cable driving. |
| 8 | No Connection | Internally unconnected; no external connection required. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable at 280MHz | Enables G = +1 configurations without external compensation - simplifies design of wideband buffers and gain-of-one signal isolators. |
| 190mA output drive capability | Eliminates need for external emitter/source followers in RGB line drivers and ADC input stages driving 75Ω/100Ω loads. |
| Low dG/dφ (0.07%/0.02°) | Preserves color fidelity in NTSC/PAL video systems without post-correction circuitry or calibration routines. |
| 2100V/µs slew rate | Supports full-scale transitions in <2ns for 5VPP signals - essential for high-resolution, high-speed data acquisition front-ends. |
| 150µA disable current | Reduces total system power in multi-amplifier architectures (e.g., video multiplexers) without requiring PCB-level power gating. |
Applications
| RGB Line Driver | Single-Supply ADC Driver |
|---|---|
|
Use Scenario: Driving three parallel 75Ω coaxial cables from an FPGA or graphics processor RGB output in embedded displays. IC Role / Device Role / Timing Role: High-current, low-distortion buffer that maintains pixel timing integrity and minimizes crosstalk between R/G/B channels. Use Value: Delivers 190MHz bandwidth and 0.07%/0.02° dG/dφ to preserve color accuracy over 10m cable runs without equalization. |
Use Scenario: Conditioning analog sensor outputs before digitization in portable spectrum analyzers or ultrasound front-ends. IC Role / Device Role / Timing Role: Single-supply input driver providing >180MHz bandwidth and 58dBc SFDR at 20MHz input frequency. Use Value: Enables 10-bit, 60MSPS ADCs (e.g., ADS823) to achieve full dynamic range without clipping or harmonic corruption. |
| Wideband Video Multiplexer | High-Speed Imaging Channel |
|
Use Scenario: Selecting between two camera inputs using wired-OR topology with make-before-break switching during vertical blanking. IC Role / Device Role / Timing Role: Channel-select amplifier with sub-400ns disable/enable timing and <±50mV turn-on glitch. Use Value: Ensures seamless video switching with no visible artifacts or sync loss - compliant with SMPTE 259M timing budgets. |
Use Scenario: Amplifying fast transient pulses from photodiode arrays or time-of-flight sensors in industrial inspection systems. IC Role / Device Role / Timing Role: Low-glitch, high-slew-rate amplifier capturing sub-10ns edge transitions with minimal overshoot. Use Value: Maintains pulse fidelity for accurate time-domain analysis - critical for laser distance measurement and LIDAR signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA690IDR | Voltage-feedback architecture; 280MHz GBW but lower slew rate (1800V/µs); higher input bias current (±10µA). | Better DC accuracy and lower noise floor; less suited for >100MHz inverting summing or video multiplexing due to gain-dependent bandwidth. | Select OPA690IDR when DC precision and low 1/f noise outweigh bandwidth stability requirements. |
| OPA2691IDR | Dual-channel version in SO-8; identical AC specs per channel but shares thermal resistance (θJA = 125°C/W), limiting simultaneous full-power operation. | Reduces board space for dual-path signal conditioning (e.g., differential ADC inputs), but requires careful thermal derating. | Choose OPA2691IDR only when dual-channel integration justifies ~15% higher per-channel thermal load vs. two OPA691IDRs. |
Compared with OPA690IDR and OPA2691IDR, the OPA691IDR uniquely balances ultra-low quiescent current (5.1mA), 2100V/µs slew rate, and 190MHz bandwidth at G = +2 - making it optimal for single-channel, high-dynamic-range, battery-sensitive applications where gain stability and disable control are mandatory.
Availability
OPA691IDR is available at Aetrix Electronics and suitable for RGB line driving, single-supply ADC buffering, and wideband video multiplexing requiring stable component supply, traceable sourcing, and long-term production continuity.
Supply support for OPA691IDR 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 amp design and manufacturing.
The OPA691IDR belongs to TI's Precision High-Speed Operational Amplifier product line, engineered specifically for demanding wideband signal conditioning in video, imaging, instrumentation, and communications infrastructure.
FAQ
What supply voltage ranges does the OPA691IDR support?
The OPA691IDR operates from ±2.5V to ±6V dual supplies or +5V to +12V single supply. At +5V single supply, it delivers 190MHz bandwidth and ±160mA output current with 1V headroom to each rail - validated per SBOS226D Electrical Characteristics tables under VS = +5V conditions.
How does the disable function work on the OPA691IDR?
The OPA691IDR disable pin (Pin 5) is active-low: pulling it below 1.5V disables the amplifier, reducing supply current to ≤150µA and placing the output in high-impedance state within 400ns. Leaving it open or holding it ≥3.3V enables normal operation - confirmed in the Disable section of SBOS226D.
Is the OPA691IDR unity-gain stable?
Yes, the OPA691IDR is unity-gain stable with 280MHz small-signal bandwidth at G = +1 (RF = 453Ω), as specified in the AC Performance table of SBOS226D. This eliminates need for external compensation in buffer configurations.
What is the maximum output current capability of the OPA691IDR?
The OPA691IDR delivers ±190mA minimum sourcing/sinking current into 100Ω loads at ±5V supplies, with short-circuit current of ±250mA. Output voltage swing remains ≥±3.9V under this load - verified in the OUTPUT section of SBOS226D Electrical Characteristics.
Does the OPA691IDR support single-supply ADC interface applications?
Yes - the OPA691IDR is explicitly recommended for single-supply ADC drivers (e.g., ADS823) in SBOS226D Applications Information. It achieves >180MHz bandwidth at G = +4 with 2VPP output swing and >58dBc SFDR at 20MHz, meeting requirements for 10-bit, 60MSPS converters.
OPA691IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
OPA691IDR FAQ
1.How can I place an order for OPA691IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA691IDR 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 OPA691IDR reliable?
The price and inventory of OPA691IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA691IDR is usually 5 days.
3.What payment methods are accepted for OPA691IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA691IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA691IDR?
OPA691IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA691IDR 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 OPA691IDR?
For technical support, including OPA691IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA691IDR requirements.
6.How does Aetrix verify that OPA691IDR is sourced from the original manufacturer or authorized distributors?
All OPA691IDR 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 OPA691IDR meets industry standards.
7.What is the process for return or replacement of OPA691IDR?
All OPA691IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA691IDR, 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 OPA691IDR part is unused and in its original packaging.
Return procedure for OPA691IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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