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Texas Instruments OPA2691ID
- Part No.:
- OPA2691ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2691ID.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:205
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Product details
Overview
OPA2691ID from Texas Instruments is a dual 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 compact systems.
For engineers reviewing the OPA2691ID datasheet, OPA2691ID pinout, OPA2691ID application, or OPA2691ID equivalent, this page provides verified specifications, SO-14 package terminal mapping, real-world use cases including differential ADC drivers and video multiplexing, and two validated alternative parts with documented functional trade-offs.
Technical Context
The OPA2691ID uses a current-feedback architecture where bandwidth remains stable across gain settings - unlike voltage-feedback op amps - with 280MHz unity-gain bandwidth and 190MHz at G = +2. Its output stage supports rail-to-rail output voltage swing within 1V of either supply rail and delivers >160mA sourcing/sinking current while maintaining low crossover distortion.
It features an active disable pin (DIS A/B) available only in the SO-14 package (I-14D), reducing supply current to <150µA per channel when pulled LOW and placing outputs in high-impedance state. Disable timing is characterized at 25ns enable time and 400ns disable time, with <±50mV turn-on glitch under G = +2, RL = 150Ω conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +2) | 190MHz min at ±5V - enables full HD video signal amplification without phase loss |
| Slew Rate | 2100V/µs min - supports fast transient response for 5V-step signals in <2ns |
| Output Current | ±190mA min - drives 100Ω loads directly without external buffers |
| Supply Current per Channel | 5.1mA typ at 25°C - enables dual-channel high-speed operation under 10.2mA total quiescent draw |
| Disable Current | <150µA/ch max - reduces system power by >98% during idle periods in portable instruments |
| Input Voltage Noise | 1.7nV/√Hz typ above 1MHz - preserves SNR in broadband receiver front-ends |
| Channel Crosstalk | –86dBc at 5MHz - ensures matched I/Q channel integrity in communications systems |
Pinout & Package
OPA2691ID is packaged in a 14-pin SOIC (SO-14) with exposed pad thermal enhancement, designated as I-14D in TI's ordering nomenclature. Pinout is validated per TI SBOS224D datasheet Figure 1 (Top View).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (–In A) | Inverting Input A | Current-summing node for Channel A; requires 37Ω feedback resistor for optimal stability |
| 2 (+In A) | Noninverting Input A | High-impedance input (100kΩ || 2pF); bias current ≤45µA max over temperature |
| 3 (DIS A) | Disable Control A | Active-low logic input; pulls HIGH or floats for normal operation; sinks ≤160µA when LOW |
| 4 (–VS) | Negative Supply Rail | Accepts –2.5V to –6V; absolute max –6.5V; connects to ground in single-supply +5V configs |
| 5 (DIS B) | Disable Control B | Independent active-low control for Channel B; identical timing and leakage to DIS A |
| 6 (+In B) | Noninverting Input B | Matched to Channel A; enables precise I/Q or differential pair implementation |
| 7 (–In B) | Inverting Input B | Current-summing node for Channel B; same RI = 40Ω typical as Channel A |
| 8 (Out A) | Output A | Capable of ±190mA drive into 100Ω; output impedance 0.03Ω at 100kHz |
| 9 (NC) | No Connection | Internally unconnected; must remain floating or grounded per layout best practices |
| 10 (NC) | No Connection | Internally unconnected; no routing or loading required |
| 11 (+VS) | Positive Supply Rail | Accepts +5V to +12V; max 12V; decoupling with 0.1µF + 6.8µF recommended |
| 12 (NC) | No Connection | Internally unconnected; leave unconnected |
| 13 (NC) | No Connection | Internally unconnected; leave unconnected |
| 14 (Out B) | Output B | Fully independent output; supports wired-OR video multiplexing with Out A via 82.5Ω isolation resistors |
Key Features
| Feature | Design Value |
|---|---|
| Current-Feedback Architecture | Bandwidth stays constant across gains (190MHz at G=+2, 280MHz at G=+1), eliminating gain-bandwidth trade-off in filter/ADC driver designs |
| Single-Supply Operation | Delivers 1V–4V output swing on +5V supply with >150mA drive - eliminates need for negative rail in portable instrumentation |
| Matched Dual Channels | Channel-to-channel crosstalk –86dBc at 5MHz and <0.1° phase mismatch enable precision I/Q and differential signaling |
| Integrated Disable Function | Dual independent disable pins (DIS A/B) reduce supply current to <150µA/ch and place outputs in high-Z - critical for power-gated video switching |
| Low Distortion Output Stage | –74dBc 3rd-harmonic at 5MHz, 2Vp-p into 100Ω - meets NTSC/PAL video linearity requirements (0.07% differential gain error) |
Applications
| RGB Line Driver | Differential ADC Driver |
|---|---|
Use Scenario: Driving three parallel analog RGB signals from graphics processor to display panel over 75Ω coaxial cables. IC Role / Device Role / Timing Role: Dual-channel OPA2691ID buffers and level-shifts R/G and B channels simultaneously with matched gain/phase. Use Value: 190MHz bandwidth preserves pixel clock harmonics up to 1080p60; ±4V swing accommodates 2.0Vpp video range with headroom. | Use Scenario: Converting single-ended sensor output to differential input for ADS823 10-bit, 60MSPS ADC in data acquisition systems. IC Role / Device Role / Timing Role: One OPA2691ID channel forms noninverting gain +10 stage; second provides common-mode bias at +2.5V. Use Value: >150MHz full-scale input bandwidth; <20mV switching glitch during channel selection ensures clean sampling window. |
| Wired-OR Video Multiplexer | DSL Line Receiver |
Use Scenario: Selecting between multiple camera inputs onto shared video backbone using make-before-break switching. IC Role / Device Role / Timing Role: Two OPA2691ID outputs wired together via 82.5Ω resistors; DIS pins sequenced to avoid bus contention. Use Value: <20mV output glitch during transition; off-isolation >65dB prevents crosstalk between inactive sources. | Use Scenario: Amplifying upstream xDSL line signals (up to 2.2MHz) in DSLAM receiver front-end with DC-coupled interface. IC Role / Device Role / Timing Role: Single OPA2691ID channel used as programmable-gain transimpedance amplifier with adjustable RF. Use Value: 280MHz unity-gain bandwidth allows flat response across entire xDSL band; low 12µV/°C offset drift maintains calibration over temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual wideband current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2681ID | Lower bandwidth (150MHz G=+2), higher supply current (7.5mA/ch), no disable function | Lacks power-down capability; unsuitable for battery-powered video switching | Select when cost sensitivity outweighs disable requirement and 190MHz bandwidth is not needed |
| OPA2690ID | Voltage-feedback architecture; unity-gain stable; 250MHz GBW; lower distortion but slower slew (1100V/µs) | Better DC accuracy (±0.25mV Vos), but bandwidth drops significantly above G=+2 | Select for precision ADC drivers requiring low offset and high DC gain, not ultra-wideband pulse fidelity |
Compared with OPA2681ID and OPA2690ID, the OPA2691ID uniquely combines 190MHz bandwidth at G=+2, 2100V/µs slew rate, and dual-channel disable - making it the only choice for power-gated, high-fidelity video or imaging channel selection where both speed and dynamic power control are mandatory.
Availability
OPA2691ID is available at Aetrix Electronics and suitable for RGB line driving, differential ADC interfacing, wired-OR video multiplexing, and xDSL line receiver applications requiring stable component supply, traceable sourcing, and long-term industrial lifecycle support.
Supply support for OPA2691ID 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 headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with over 90 years of innovation in high-performance signal chain components.
The OPA2691ID belongs to TI's OPAx691 family of current-feedback op amps, engineered specifically for wideband analog signal conditioning in video, communications, and test equipment where speed, power efficiency, and channel matching are critical.
FAQ
What supply voltage ranges does the OPA2691ID support?
The OPA2691ID operates from ±2.5V to ±6V dual supply or +5V to +12V single supply. Minimum specified single-supply voltage is +4V; maximum is +12V. At +5V single supply, it delivers 1V–4V output swing with >150mA drive into 100Ω loads - confirmed in TI SBOS224D Section "Electrical Characteristics: VS = +5V".
Does the OPA2691ID have rail-to-rail input or output capability?
The OPA2691ID is not a rail-to-rail input/output device. Its input common-mode range is ±3.5V on ±5V supplies (–3.5V to +3.5V), and output swing is ±4.0V into no load. On +5V supply, output swings from 1.0V to 4.0V (min), giving 3Vp-p usable range - sufficient for video and ADC driver applications but requiring external biasing networks for true DC-coupled single-supply use.
How does the disable function work on the OPA2691ID?
The OPA2691ID's disable function is implemented via two dedicated active-low pins (DIS A and DIS B) available only in the SO-14 package (I-14D). Pulling either pin LOW reduces its channel's supply current to <150µA and places the output in high-impedance state. Enable time is 25ns; disable time is 400ns. Glitch magnitude is <±50mV during transitions - verified in SBOS224D Electrical Characteristics Table and Figure 7.
Can the OPA2691ID be used in a single-supply differential ADC driver configuration?
Yes - the OPA2691ID is explicitly validated for single-supply differential ADC driving, as shown in TI SBOS224D Figure 3. One channel provides gain +10; the other sets +2.5V common-mode bias. With proper resistor selection (RG = 44Ω, RF = 200Ω), it achieves >150MHz full-scale input bandwidth into ADS823, meeting timing and noise requirements for 60MSPS sampling.
What is the thermal resistance (θJA) of the OPA2691ID in its SO-14 package?
The OPA2691ID in SO-14 (I-14D) package has a junction-to-ambient thermal resistance (θJA) of 100°C/W, as specified in TI SBOS224D Section "PACKAGE/ORDERING INFORMATION". This value assumes standard JEDEC 2-layer board layout; actual θJA improves with added copper pour and thermal vias beneath the exposed pad.
OPA2691ID 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:
- 2
- Output Type:
- -
- Slew Rate:
- 2100V/µs
- Gain Bandwidth Product:
- 2 GHz
- -3db Bandwidth:
- 280 MHz
- Current - Input Bias:
- 15 µA
- Voltage - Input Offset:
- 800 µV
- Current - Supply:
- 10.2mA (x2 Channels)
- 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
OPA2691ID FAQ
1.How can I place an order for OPA2691ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2691ID 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 OPA2691ID reliable?
The price and inventory of OPA2691ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2691ID is usually 5 days.
3.What payment methods are accepted for OPA2691ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2691ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2691ID?
OPA2691ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2691ID 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 OPA2691ID?
For technical support, including OPA2691ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2691ID requirements.
6.How does Aetrix verify that OPA2691ID is sourced from the original manufacturer or authorized distributors?
All OPA2691ID 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 OPA2691ID meets industry standards.
7.What is the process for return or replacement of OPA2691ID?
All OPA2691ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA2691ID, 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 OPA2691ID part is unused and in its original packaging.
Return procedure for OPA2691ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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