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Texas Instruments OPA2691IDR
- Part No.:
- OPA2691IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2691IDR.pdf
- Description:
- IC OPAMP CFA 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,090
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Product details
Overview
OPA2691IDR 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 OPA2691IDR datasheet, OPA2691IDR pinout, OPA2691IDR application, or OPA2691IDR equivalent, key selection criteria include its current-feedback architecture's gain-independent bandwidth, low 5.1mA/ch quiescent current, SO-8 package footprint, and integrated disable functionality for power-gated channel management in video, imaging, and instrumentation designs.
Technical Context
The OPA2691IDR employs a current-feedback topology with transimpedance gain (ZOL) of 225kΩ (min), enabling stable operation across gains from +1 to +10 without external compensation. Its output stage supports rail-to-rail output voltage swing within 1V of supply rails and delivers >160mA sourcing/sinking current into 100Ω loads while maintaining <0.2dB gain flatness up to 90MHz at G = +2.
It features a dedicated disable pin (DIS) only in SO-14 variants - not present in the SO-8 OPA2691IDR - so the OPA2691IDR operates in permanent-enable mode. DC performance includes ±0.8mV input offset voltage (max), 56dB CMRR, and ±12µV/°C drift, supporting precision broadband amplification without enable/disable sequencing overhead.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +2) | 190MHz min - enables full HD video signal amplification with headroom for filter roll-off. |
| Slew Rate | 2100V/µs min - supports clean 5Vp-p step response in <2ns, critical for pulse fidelity in imaging channels. |
| Output Current (sourcing/sinking) | ±190mA min - drives 100Ω loads directly without external buffers, reducing BOM count in line drivers. |
| Supply Current per Channel | 5.1mA max at +25°C - enables dual-channel high-speed amplification under 10.2mA total, ideal for portable instruments. |
| Input Voltage Noise Density | 1.7nV/√Hz typ - preserves SNR in front-end ADC driver stages where noise folding dominates system noise floor. |
| Harmonic Distortion (2nd, 5MHz) | –70dBc max (RL ≥ 500Ω) - meets broadcast-grade video differential gain/phase specs (<0.07%/0.02°). |
| Common-Mode Input Range | ±3.5V min (±5V supply) - accommodates large-swing AC-coupled signals without clipping in bipolar configurations. |
Pinout & Package
OPA2691IDR is housed in an 8-pin SOIC (SO-8) package with standard dual op amp pinout and no disable pin. Thermal resistance θJA is 125°C/W, suitable for surface-mount PCB layouts with moderate copper pour.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input A | Current-summing node for Channel A; requires matched feedback resistor for stable current-feedback operation. |
| 2 | Noninverting Input A | High-impedance (+) input for Channel A; bias current ≤ +45µA ensures minimal DC error in high-Z sensor interfaces. |
| 3 | Output A | Low-impedance output capable of ±190mA drive; closed-loop ZOUT = 0.03Ω at 100kHz minimizes load-induced phase shift. |
| 4 | –VS | Negative supply rail connection; must be decoupled with 0.1µF ceramic capacitor near pin for stability. |
| 5 | –VS | Shared negative supply pin for both channels; internal bonding ensures matched thermal path and PSRR. |
| 6 | Output B | Independent output for Channel B; channel-to-channel crosstalk ≤ –86dBc at 5MHz enables I/Q signal integrity. |
| 7 | Noninverting Input B | Matched to Pin 2; enables precise differential gain matching in ADC driver or active filter applications. |
| 8 | +VS | Positive supply rail; accepts +5V to +12V single supply or ±2.5V to ±6V dual supply per specification. |
Key Features
| Feature | Design Value |
|---|---|
| Gain-independent bandwidth | Bandwidth varies <10% from G = +1 (280MHz) to G = +10 (200MHz), simplifying multi-gain system design. |
| Single-supply operation | Delivers 1V–4V output swing on +5V supply with >150mA drive - eliminates need for level-shifting in embedded ADC front ends. |
| Low distortion at high frequency | –74dBc 3rd-harmonic at 5MHz/2Vp-p into 100Ω enables composite video and xDSL upstream line driving. |
| Matched dual-channel performance | Channel-to-channel crosstalk ≤ –86dBc and <0.1° phase mismatch support I/Q demodulation accuracy. |
| Robust input protection | ±1.2V differential input rating and 2000V HBM ESD rating allow direct interface to unconditioned video or RF sources. |
Applications
| RGB Video Line Driver | Differential ADC Input Driver |
|---|---|
|
Use Scenario: Driving three parallel 75Ω coaxial cables from graphics controller outputs in industrial HMIs. IC Role / Device Role / Timing Role: Dual-channel OPA2691IDR configures as two independent unity-gain buffers (one per R/G channel), with third channel implemented via second device. Use Value: 190MHz bandwidth and <0.07% differential gain error preserve color fidelity across full 1080p pixel clock spectrum. |
Use Scenario: Conditioning single-ended sensor signals before digitization by 10-bit, 60MSPS ADS823 ADC. IC Role / Device Role / Timing Role: Dual amplifier forms active filter + gain block in single-supply differential driver circuit with transformer-coupled inputs. Use Value: >150MHz full-scale input bandwidth and –70dBc harmonic distortion meet ADS823 SFDR requirements at Nyquist. |
| High-Speed Imaging Channel | Active Wideband Filter Stage |
|
Use Scenario: Amplifying fast transient pulses from CMOS image sensor column outputs in medical ultrasound beamforming. IC Role / Device Role / Timing Role: OPA2691IDR acts as low-noise, high-slew-rate gain stage preceding correlated double sampling (CDS) circuitry. Use Value: 2100V/µs slew rate resolves sub-5ns pixel pulses without edge rounding; 1.7nV/√Hz noise maintains dynamic range. |
Use Scenario: Implementing 2nd-order Sallen-Key low-pass filter at 100MHz cutoff in optical time-of-flight receiver front end. IC Role / Device Role / Timing Role: Fixed-gain current-feedback op amp replaces voltage-feedback part to decouple filter Q-factor from amplifier bandwidth limitations. Use Value: Gain-flat bandwidth ensures predictable pole placement; 0.03Ω output impedance prevents RC network interaction. |
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 |
|---|---|---|---|
| OPA2690IDR | Voltage-feedback architecture; unity-gain stable; 280MHz GBW; 1000V/µs slew rate; higher DC accuracy (±0.2mV VOS). | Better for precision DC-coupled gain blocks where bandwidth stability across temperature matters more than raw speed. | Select OPA2690IDR when system requires lower input offset drift and tighter DC matching over wide temperature range. |
| OPA2681IDR | Current-feedback; 220MHz bandwidth at G = +2; 1900V/µs slew rate; 4.5mA/ch supply current; no disable pin; SO-8 package. | Lower power and slightly reduced bandwidth vs OPA2691IDR; optimized for cost-sensitive portable test equipment. | Select OPA2681IDR when 190MHz bandwidth is marginally sufficient and quiescent current reduction below 5mA/ch is critical. |
Compared with OPA2690IDR, the OPA2691IDR trades DC precision for superior AC performance and slew rate; compared with OPA2681IDR, it delivers higher bandwidth and output current at modestly higher supply current - making it optimal for demanding video and high-fidelity imaging paths.
Availability
OPA2691IDR is available at Aetrix Electronics and suitable for RGB video line driving, differential ADC input conditioning, high-speed imaging channel amplification, and active wideband filter design requiring stable component supply across industrial, medical, and test equipment programs.
Supply support for OPA2691IDR 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 OPA2691IDR belongs to TI's high-performance current-feedback op amp product line, engineered specifically for broadband video, communications, and instrumentation applications demanding simultaneous high speed, low distortion, and robust output drive.
FAQ
What is the maximum operating supply voltage for the OPA2691IDR?
The OPA2691IDR supports a maximum operating voltage range of ±6V for dual-supply use or +12V for single-supply operation. Exceeding these limits risks permanent damage, as confirmed by Absolute Maximum Ratings in the SBOS224D datasheet. Operation at ±5V or +5V is recommended for optimal AC performance and thermal safety in the SO-8 package.
Does the OPA2691IDR have a disable function?
No, the OPA2691IDR does not include a disable pin. The disable feature is exclusive to the SO-14 variant (OPA2691I-14DR). The OPA2691IDR is an SO-8 packaged version with fixed-enable operation - all pins are signal or power connections, and no DIS terminal exists. This simplifies layout but removes power-gating capability.
What is the typical input bias current for the OPA2691IDR at +25°C?
The typical noninverting input bias current for the OPA2691IDR is +15µA, and the inverting input bias current is ±5µA, both specified at +25°C with ±5V supplies. These values increase with temperature, reaching +45µA (noninverting) and ±40µA (inverting) over the full –40°C to +85°C range, as documented in the Electrical Characteristics table.
Can the OPA2691IDR drive a 50Ω load effectively?
Yes, the OPA2691IDR can drive a 50Ω load with ±190mA output current capability. At ±5V supply, it delivers ±3.9V swing into 100Ω and ±3.3V into 100Ω at +85°C - extrapolating to ~±3.0V into 50Ω. For optimal 50Ω matching, use series output resistors (e.g., 25Ω) to isolate capacitive loads and maintain stability, as shown in TI's Figure 1 test circuit.
What is the small-signal bandwidth of the OPA2691IDR at G = +1?
The small-signal bandwidth of the OPA2691IDR is 280MHz (typical) at G = +1 with ±5V supplies and RF = 453Ω. This value is tested under conditions defined in Figure 1 of SBOS224D and represents the –3dB point for 0.5Vp-p output. Bandwidth remains >200MHz even at G = +10, confirming true current-feedback behavior.
OPA2691IDR 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:
- 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
OPA2691IDR FAQ
1.How can I place an order for OPA2691IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2691IDR 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 OPA2691IDR reliable?
The price and inventory of OPA2691IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2691IDR is usually 5 days.
3.What payment methods are accepted for OPA2691IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2691IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2691IDR?
OPA2691IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2691IDR 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 OPA2691IDR?
For technical support, including OPA2691IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2691IDR requirements.
6.How does Aetrix verify that OPA2691IDR is sourced from the original manufacturer or authorized distributors?
All OPA2691IDR 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 OPA2691IDR meets industry standards.
7.What is the process for return or replacement of OPA2691IDR?
All OPA2691IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2691IDR, 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 OPA2691IDR part is unused and in its original packaging.
Return procedure for OPA2691IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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