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Texas Instruments OPA691IDG4
- Part No.:
- OPA691IDG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA691IDG4.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,642
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Product details
Overview
OPA691IDG4 from Texas Instruments is a wideband current-feedback operational amplifier optimized for high-speed, low-distortion signal conditioning in single-supply systems. 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 ADC input buffering with <0.07% differential gain error and 0.02° phase error in NTSC video applications.
For engineers reviewing the OPA691IDG4 datasheet, OPA691IDG4 pinout, OPA691IDG4 application, or OPA691IDG4 equivalent, key selection criteria include disable-enabled power management (150µA shutdown current), wideband inverting summing capability, single-supply +5V operation with 1V headroom, and precise DC accuracy (±0.5mV offset) across –40°C to +85°C.
Technical Context
The OPA691IDG4 employs a current-feedback architecture where bandwidth remains stable across gains (280MHz at G = 1, 190MHz at G = +2), unlike voltage-feedback op amps. Its transimpedance gain (ZOL) is 225kΩ min at ±5V, with RI ≈ 35Ω at the inverting input - enabling predictable gain-setting via RF and RG without stability trade-offs.
It integrates a high-current, low-crossover-distortion output stage delivering ±190mA into 100Ω while maintaining 190MHz small-signal bandwidth and <–70dBc harmonic distortion at 5MHz. The DIS pin enables fast enable/disable (25ns/400ns) with <±50mV turn-on glitch and 70dB off-isolation at 5MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +2) | 190MHz min at ±5V - supports >100MHz video and IF signals with flat gain response. |
| Slew Rate | 2100V/µs min - enables clean 5VPP step response in <2ns without slewing artifacts. |
| Output Current | ±190mA min - drives 100Ω loads directly without external buffers in ADC front-ends. |
| Differential Gain/Phase | 0.07%/0.02° typ - meets broadcast video specs for NTSC/PAL without post-correction. |
| Supply Current | 5.1mA max at ±5V - enables low-power portable instrumentation with disable reducing to 150µA. |
| Input Offset Voltage | ±0.5mV max at 25°C - ensures <1LSB error when driving 10-bit ADCs with 2VPP full-scale range. |
| Disable Enable Time | 25ns typ - supports high-speed channel switching in multiplexed video or RF summing systems. |
Pinout & Package
OPA691IDG4 is packaged in an SO-8 (D) surface-mount package with exposed pad for thermal performance (θJA = 125°C/W). Pin 1 is NC; Pin 2 is inverting input; Pin 3 is noninverting input; Pin 4 is –VS; Pin 5 is DIS; Pin 6 is +VS; Pin 7 is output; Pin 8 is NC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1, Pin 8 | No Connection | Internally unconnected - must be left floating or tied to ground per layout best practices. |
| Pin 2 | Inverting Input | Current-summing node with 35Ω input resistance - sets feedback gain with RF and defines inverting configuration. |
| Pin 3 | Noninverting Input | Voltage-sensing node with 100kΩ || 2pF impedance - used for biasing, reference, or noninverting gain paths. |
| Pin 4 | Negative Supply | Return path for internal current sources - requires local 0.1µF decoupling to minimize PSRR degradation. |
| Pin 5 | Disable Control | Active-low TTL-compatible input - pulls output to high-Z and reduces supply current to <150µA when LOW. |
| Pin 6 | Positive Supply | Power rail for internal bias and output stage - accepts +5V to +12V or ±2.5V to ±6V operation. |
| Pin 7 | Output | Class-AB output stage capable of ±190mA - designed for direct drive into 50Ω/75Ω/100Ω loads with minimal headroom. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable | 280MHz bandwidth at G = 1 - eliminates need for external compensation in buffer configurations. |
| Low distortion at high frequency | –74dBc 3rd-harmonic at 5MHz, RL ≥ 500Ω - preserves SFDR in IF amplification and ADC driver stages. |
| Single-supply +5V operation | 1V to 4V output swing with >150mA drive - enables direct interface to 5V ADCs without level-shifting. |
| Fast disable control | 25ns enable / 400ns disable timing - supports sub-microsecond channel selection in video multiplexers. |
| Precision DC performance | ±0.5mV offset and ±12µV/°C drift - maintains accuracy over temperature in precision sensor signal chains. |
Applications
| RGB Line Driver | ADC Input Buffer |
|---|---|
Use Scenario: Driving three parallel 75Ω coaxial cables from a graphics controller's analog RGB outputs in embedded displays. IC Role / Device Role / Timing Role: High-fidelity, low-phase-error voltage buffer with disable for hot-plug detection and power gating. Use Value: Delivers 0.07% dG / 0.02° dP across NTSC bandwidth, eliminating external calibration while supporting 1920×1080@60Hz pixel rates. | Use Scenario: Conditioning analog sensor signals before digitization in a 10-bit, 60MSPS ADC (e.g., ADS823) within portable test equipment. IC Role / Device Role / Timing Role: Single-supply, AC-coupled driver providing 2VPP swing with >180MHz bandwidth and <±50mV turn-on glitch. Use Value: Achieves >58dBc SFDR at 20MHz input frequency, meeting dynamic range requirements without post-processing. |
| Wideband Inverting Summing | Video Multiplexer |
Use Scenario: Combining five 50Ω RF inputs (e.g., from antenna array elements) into one broadband IF output in communications receivers. IC Role / Device Role / Timing Role: Current-feedback summing amplifier with noise gain-independent bandwidth and matched 100Ω inputs. Use Value: Provides >200MHz small-signal bandwidth and –1dB compression at 15dBm into 50Ω, enabling multi-channel signal fusion without bandwidth loss. | Use Scenario: Switching between two composite video sources onto a shared 75Ω monitor feed in broadcast switchers or medical imaging systems. IC Role / Device Role / Timing Role: Wired-OR multiplexer using "make-before-break" disable timing to prevent signal dropout during transitions. Use Value: Ensures continuous line control with <±20mV turn-off glitch and 70dB off-isolation, eliminating visible sync glitches in real-time video routing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA681ID | Lower bandwidth (150MHz G=+2), no disable pin, 3.5mA supply current | Lacks power-down mode and video-grade dG/dP specs - suitable only for fixed-gain, always-on summing. | Select when disable functionality and NTSC compliance are unnecessary and cost is prioritized. |
| OPA2691IDR | Dual-channel version in SO-8, same bandwidth/slew but shared disable pin per channel | Enables dual-path signal conditioning (e.g., Y/C separation) with independent enable control per channel. | Select when space-constrained designs require two matched OPA691-like amplifiers in one package. |
Compared with OPA681ID and OPA2691IDR, the OPA691IDG4 uniquely combines single-channel disable control, broadcast-grade video linearity, and highest bandwidth in its supply current class - making it optimal for power-aware, high-fidelity signal routing where channel independence and precision matter.
Availability
OPA691IDG4 is available at Aetrix Electronics and suitable for RGB line drivers, ADC input buffers, wideband summing amplifiers, and video multiplexers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for OPA691IDG4 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 OPA691IDG4 belongs to TI's OPAx69x current-feedback amplifier family, engineered specifically for demanding video, communications, and data acquisition systems requiring wide bandwidth, low distortion, and robust single-supply operation.
FAQ
What is the maximum operating supply voltage for the OPA691IDG4?
The OPA691IDG4 supports a maximum operating voltage of ±6V for dual-supply use or +12V for single-supply operation, as specified in its Absolute Maximum Ratings. Exceeding these limits risks permanent damage. Operation at ±5V or +5V is recommended for optimal AC performance and thermal safety in standard PCB layouts.
Does the OPA691IDG4 require external compensation for unity-gain stability?
No, the OPA691IDG4 is internally compensated and unity-gain stable, delivering 280MHz bandwidth at G = 1 without external components. This eliminates compensation network design effort and ensures consistent performance across board variants - a key advantage over many competing current-feedback op amps that require careful RF/RI tuning for stability.
How does the disable function affect output state in the OPA691IDG4?
When the DIS pin of the OPA691IDG4 is pulled LOW, the output enters a high-impedance state and supply current drops to <150µA. The output does not short or clamp - it floats - allowing safe wired-OR connection of multiple OPA691IDG4 outputs. This behavior is confirmed in the Electrical Characteristics table under "DISABLE" parameters and verified in Figure 6 of the datasheet.
Can the OPA691IDG4 drive a 50Ω load directly in single-supply +5V mode?
Yes, the OPA691IDG4 can drive a 50Ω load directly from a +5V supply, delivering up to 160mA sourcing/sinking current with 1.1V to 3.9V output swing (min) and >140MHz bandwidth at G = +2. Layout best practices - including local 0.1µF VS/VSS decoupling and controlled-impedance routing - are required to maintain this performance per Figure 2 in the datasheet.
What is the typical differential phase error of the OPA691IDG4 in NTSC video applications?
The OPA691IDG4 achieves a typical differential phase error of 0.02° at G = +2, VO = 1.4Vp, RL = 150Ω under NTSC conditions - matching broadcast-grade video amplifier requirements. This value is measured and published in the Electrical Characteristics table and is critical for preserving color fidelity in analog video signal chains without external correction circuitry.
OPA691IDG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
OPA691IDG4 FAQ
1.How can I place an order for OPA691IDG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA691IDG4 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 OPA691IDG4 reliable?
The price and inventory of OPA691IDG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA691IDG4 is usually 5 days.
3.What payment methods are accepted for OPA691IDG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA691IDG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA691IDG4?
OPA691IDG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA691IDG4 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 OPA691IDG4?
For technical support, including OPA691IDG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA691IDG4 requirements.
6.How does Aetrix verify that OPA691IDG4 is sourced from the original manufacturer or authorized distributors?
All OPA691IDG4 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 OPA691IDG4 meets industry standards.
7.What is the process for return or replacement of OPA691IDG4?
All OPA691IDG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA691IDG4, 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 OPA691IDG4 part is unused and in its original packaging.
Return procedure for OPA691IDG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA691IDG4 Tags
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