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Texas Instruments OPA691IDBVR
- Part No.:
- OPA691IDBVR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA691IDBVR.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
OPA691IDBVR from Texas Instruments is a wideband current-feedback operational amplifier optimized for single-supply +5V operation, delivering 190MHz bandwidth (G = +2), 2100 V/µs slew rate, ±4.0V output swing, and 190mA output current. It features an integrated disable pin enabling <150µA power-down mode and is widely deployed as an RGB line driver and ADC input buffer in high-speed data acquisition systems.
For engineers reviewing the OPA691IDBVR datasheet, OPA691IDBVR pinout, OPA691IDBVR application, or OPA691IDBVR equivalent, key selection criteria include its current-feedback architecture's gain-independent bandwidth, low distortion at high frequencies (–74 dBc 3rd-harmonic @ 5 MHz), precise disable timing (25 ns enable / 400 ns disable), and SOT-23-6 package compatibility with space-constrained video and instrumentation designs.
Technical Context
The OPA691IDBVR employs a current-feedback topology where bandwidth remains stable across gains (e.g., 225 MHz at G = +1, 190 MHz at G = +2 on +5V supply), unlike voltage-feedback amplifiers. Its transimpedance gain (ZOL) is 200 kΩ min at +5V, with inverting-input resistance of 38 Ω and noninverting-input impedance of 100 kΩ || 2 pF.
It integrates a low-headroom output stage enabling ±3.9V swing into 100Ω on +5V supply, with differential gain/phase of 0.07%/0.02° (NTSC, RL = 150Ω). The disable function asserts high-impedance output and reduces supply current to ≤150 µA while maintaining 70 dB off-isolation at 5 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +2) | 190 MHz min on +5V supply - enables >100 MHz analog signal paths without gain trade-offs |
| Slew Rate | 2100 V/µs min (±5V) / 850 V/µs min (+5V) - supports fast transient response for pulse and video signals |
| Output Current | ±190 mA min (±5V) / ±160 mA min (+5V) - drives heavy capacitive or resistive loads including 75Ω video lines |
| Differential Gain/Phase | 0.07% / 0.02° (NTSC, RL = 150Ω) - preserves color fidelity in composite video applications |
| Disable Supply Current | ≤150 µA max - reduces system standby power in multiplexed video or channelized ADC front-ends |
| Enable/Disable Time | 25 ns enable / 400 ns disable - ensures clean, glitch-controlled switching in wired-OR multiplexers |
| Input Voltage Noise | 1.7 nV/√Hz typ - maintains SNR integrity in low-noise signal conditioning stages |
Pinout & Package
SOT-23-6 package (DBV), 1.6 mm × 2.9 mm footprint, −40°C to +85°C operating range, thermal resistance θJA = 150°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Output) | Amplifier output node | Delivers high-current, low-distortion signal; high-impedance when DIS = LOW |
| 2 (–VS) | Negative supply connection | Ground reference for single-supply operation or negative rail for dual-supply use |
| 3 (Noninverting Input) | Positive input terminal | High-impedance (100 kΩ || 2 pF); sets common-mode bias point in AC-coupled configurations |
| 4 (+VS) | Positive supply connection | Accepts +5V to +12V; powers internal biasing and output stage |
| 5 (DIS) | Active-low disable control | Pulled LOW disables output and cuts supply current to ≤150 µA; open or HIGH enables normal operation |
| 6 (Inverting Input) | Negative input terminal | Low-impedance (~38 Ω); defines feedback path and sets closed-loop gain with RF/RG |
Key Features
| Feature | Design Value |
|---|---|
| Current-feedback architecture | Bandwidth stable across gains (190–225 MHz) - eliminates bandwidth vs. gain compromise in wideband systems |
| Single-supply +5V operation | 1V headroom to rails (1.1–3.9V output swing) - simplifies power design in portable instruments and embedded ADC interfaces |
| Integrated disable function | 25 ns enable / 400 ns disable with ±50 mV turn-on glitch - enables seamless channel switching in video multiplexers |
| Low distortion at high frequency | –74 dBc 3rd-harmonic @ 5 MHz, RL = 100Ω - meets SFDR requirements for 10-bit+ ADC drivers up to 60 MSPS |
| Optimized output stage | Minimal crossover distortion and ±190 mA drive - delivers linear large-signal performance in RGB and imaging buffers |
Applications
| RGB Line Driver | Single-Supply ADC Buffer |
|---|---|
Use Scenario: Driving three parallel 75Ω coaxial cables carrying red, green, and blue analog video signals from a graphics processor to a display panel. IC Role / Device Role / Timing Role: High-current, low-dG/dφ buffer amplifying each channel independently with disable control for blanking intervals. Use Value: 0.07%/0.02° differential gain/phase error preserves color accuracy; 190mA output sustains 1V–4V swing into 75Ω loads at 100+ MHz. |
Use Scenario: Conditioning analog sensor outputs before digitization by a +5V-powered 10-bit, 60MSPS ADC (e.g., ADS823). IC Role / Device Role / Timing Role: Single-supply, AC-coupled gain-of-+4 driver providing >180MHz bandwidth and >58dBc SFDR at 20MHz input. Use Value: 2100 V/µs slew rate prevents slewing-induced distortion; 1.7 nV/√Hz noise avoids degrading ADC ENOB. |
| Wired-OR Video Multiplexer | Wideband Inverting Summing Amplifier |
Use Scenario: Selecting between two NTSC video sources using make-before-break switching onto a shared 75Ω output line. IC Role / Device Role / Timing Role: Dual-channel OPA691IDBVR configured with synchronized DIS control to avoid output glitches during transitions. Use Value: 70 dB off-isolation prevents crosstalk; ±50 mV turn-on glitch stays below visibility threshold in sync-blanked intervals. |
Use Scenario: Combining five 50Ω RF inputs (e.g., from antenna elements) into a single broadband IF summing node for spectrum analysis. IC Role / Device Role / Timing Role: Inverting summing amplifier with matched 100Ω inputs and 100Ω feedback, optimized for NG = 6 and >200MHz bandwidth. Use Value: Current-feedback architecture maintains flat gain up to 100MHz; –1dB compression at 15dBm supports high-dynamic-range signal aggregation. |
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 |
|---|---|---|---|
| OPA690IDBVR | Voltage-feedback architecture; unity-gain stable; 280 MHz BW at G = 1 but bandwidth drops sharply with gain (e.g., ~120 MHz at G = +2) | Better DC accuracy (lower VOS, higher CMRR) but lower large-signal linearity at high gain | Choose OPA690IDBVR when precision DC performance and moderate bandwidth are prioritized over high-output-current video drive. |
| OPA2691IDGKR | Dual-channel version in VSSOP-8; identical AC specs per channel but higher quiescent current (2 × 5.1 mA) and no disable pin per channel | Enables dual-path signal conditioning (e.g., I/Q channels) but lacks per-channel power gating | Choose OPA2691IDGKR when board space allows dual-channel integration and independent disable is not required. |
Compared with OPA690IDBVR and OPA2691IDGKR, the OPA691IDBVR uniquely combines single-channel SOT-23-6 packaging, per-channel disable, and current-feedback bandwidth stability-making it optimal for space-constrained, multiplexed, or battery-sensitive wideband analog signal paths.
Availability
OPA691IDBVR is available at Aetrix Electronics and suitable for RGB line driving, single-supply ADC buffering, and wideband video multiplexing requiring stable component supply across industrial, test & measurement, and broadcast equipment programs.
Supply support for OPA691IDBVR 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 innovation in high-speed op amps and precision signal chain solutions.
The OPA691IDBVR belongs to TI's high-performance current-feedback op amp product line, engineered specifically for demanding wideband applications including video, imaging, instrumentation, and high-speed data conversion where gain-flexible bandwidth and low-power disable are critical.
FAQ
What is the maximum small-signal bandwidth of the OPA691IDBVR on a +5V supply?
The OPA691IDBVR achieves a minimum small-signal bandwidth of 190 MHz at a noise gain of +2 when operated on a +5V supply, as specified in the Electrical Characteristics table under VS = +5V conditions. This bandwidth remains usable up to 140 MHz across the full –40°C to +85°C temperature range, supporting high-fidelity signal transmission in video and IF applications.
Does the OPA691IDBVR support true rail-to-rail input and output operation?
No, the OPA691IDBVR is not a rail-to-rail device. On a +5V supply, its input common-mode range extends from 1.5V to 3.5V, and its output swings from 1.1V to 3.9V into a 100Ω load referenced to +2.5V. While it requires only ~1V headroom to each rail, this limited range necessitates proper DC biasing-typically achieved via resistive dividers-as shown in Figure 2 of the datasheet.
How does the disable function affect output state and isolation in the OPA691IDBVR?
When the DIS pin is pulled LOW, the OPA691IDBVR output enters a high-impedance state and supply current drops to ≤150 µA. Off-isolation is 70 dB at 5 MHz, ensuring minimal feedthrough from input to output. The output capacitance in disable mode is 4 pF, preserving signal integrity in multiplexed bus architectures without requiring external blocking components.
Can the OPA691IDBVR drive a 75Ω video load while maintaining NTSC video specifications?
Yes. The OPA691IDBVR delivers 0.07% differential gain error and 0.02° differential phase error driving a 150Ω load (standard NTSC test condition), and its 190mA output current easily sustains 1V–4V swings into 75Ω with appropriate series termination. Application circuits in the datasheet confirm compliant performance in RGB and composite video line-driving roles.
What is the recommended feedback resistor value for G = +2 operation on +5V supply?
The datasheet specifies RF = 453 Ω for G = +2 operation on +5V supply (Figure 2), optimized to maintain flat frequency response and maximize bandwidth. This value compensates for the shift in optimal transimpedance due to single-supply biasing and ensures stable performance with typical PCB parasitics and load conditions encountered in video and ADC interface designs.
OPA691IDBVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- 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:
- SOT-23-6
OPA691IDBVR FAQ
1.How can I place an order for OPA691IDBVR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA691IDBVR 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 OPA691IDBVR reliable?
The price and inventory of OPA691IDBVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA691IDBVR is usually 5 days.
3.What payment methods are accepted for OPA691IDBVR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA691IDBVR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA691IDBVR?
OPA691IDBVR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA691IDBVR 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 OPA691IDBVR?
For technical support, including OPA691IDBVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA691IDBVR requirements.
6.How does Aetrix verify that OPA691IDBVR is sourced from the original manufacturer or authorized distributors?
All OPA691IDBVR 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 OPA691IDBVR meets industry standards.
7.What is the process for return or replacement of OPA691IDBVR?
All OPA691IDBVR units undergo pre-shipment inspection (PSI). If there is an issue with OPA691IDBVR, 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 OPA691IDBVR part is unused and in its original packaging.
Return procedure for OPA691IDBVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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