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Texas Instruments OPA691IDRG4
- Part No.:
- OPA691IDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA691IDRG4.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,247
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Product details
Overview
OPA691IDRG4 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 OPA691IDRG4 datasheet, OPA691IDRG4 pinout, OPA691IDRG4 application, or OPA691IDRG4 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 industrial temperature range (–40°C to +85°C).
Technical Context
The OPA691IDRG4 employs a current-feedback architecture where bandwidth remains stable across gains - e.g., 225MHz at G = +1, 190MHz at G = +2, and 155MHz at G = +10 under +5V operation. Its transimpedance gain (ZOL) is 200kΩ min at +5V, with input bias currents of ±5µA (inverting) and +20µA (noninverting) at VCM = 2.5V.
It features a dedicated DIS pin that, when pulled LOW, reduces supply current to ≤150µA and places the output in high-impedance state within 400ns. The output stage supports minimal voltage headroom (1V from rails), enabling 1V–4V swing on +5V supply while sourcing/sinking ≥160mA into 100Ω loads at room temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +2) | 190MHz min at +5V supply - enables full HD video signal amplification without gain-dependent bandwidth loss. |
| Slew Rate | 2100V/µs min (±5V), 850V/µs min (+5V) - supports fast transient response for 2VPP pulses in ADC driver applications. |
| Output Current | ±190mA min (±5V), ±160mA min (+5V) - drives heavy capacitive or resistive loads such as 75Ω video cables or 100Ω ADC inputs. |
| Supply Current | 5.1mA max (±5V), 4.5mA max (+5V) - enables low-power portable instrumentation without sacrificing speed. |
| Disable Current | ≤150µA at VDIS = 0V - allows power gating in multi-channel video multiplexers or battery-powered systems. |
| Differential Gain/Phase | 0.07%/0.02° typ (NTSC, RL = 150Ω) - meets broadcast-grade video fidelity requirements for RGB or composite video buffers. |
| Input Voltage Noise | 1.7nV/√Hz typ (>1MHz) - preserves SNR in high-frequency signal chains like IF amplifiers or imaging channels. |
Pinout & Package
OPA691IDRG4 is packaged in an SO-8 (D) surface-mount package with exposed pad for thermal performance. Pinout follows standard current-feedback op amp configuration with dedicated disable control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connection | Unbonded die pad - must be left floating or grounded per layout best practices; no electrical function. |
| 2 (Inverting Input) | Inverting Input Terminal | Low-impedance node (38Ω typ) accepting feedback network; sets closed-loop gain with RF and RG. |
| 3 (Noninverting Input) | Noninverting Input Terminal | High-impedance input (100kΩ || 2pF) used for reference biasing in single-supply configurations. |
| 4 (–VS) | Negative Supply Rail | Connects to ground in single-supply mode or –5V in dual-supply; supports rail-to-rail input common-mode range. |
| 5 (DIS) | Disable Control Input | Active-Low logic input; <1.5V disables amplifier, >3.3V enables; 75µA max input bias ensures easy CMOS interfacing. |
| 6 (+VS) | Positive Supply Rail | Accepts +5V to +12V; internal biasing is supply-independent, enabling stable operation across voltage range. |
| 7 (Output) | Amplifier Output | Capable of ±190mA drive into 100Ω; low 0.03Ω closed-loop output impedance minimizes gain error at high frequencies. |
| 8 (NC) | No Connection | Unbonded die pad - electrically isolated; recommended to tie to ground for EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Wideband current-feedback architecture | Maintains >190MHz bandwidth from G = +1 to G = +10 - eliminates gain-bandwidth trade-off in multi-gain systems. |
| Single-supply optimized output stage | Delivers 1V–4V output swing on +5V supply with <1V headroom - enables direct interface to 10-bit+ ADCs without level-shifting. |
| Low-distortion video performance | dG/dφ = 0.07%/0.02° ensures NTSC/PAL color fidelity - critical for RGB line drivers and broadcast video buffers. |
| Fast enable/disable timing | 25ns enable time and 400ns disable time - supports sub-microsecond channel switching in wired-OR video multiplexers. |
| Thermally enhanced SO-8 package | θJA = 125°C/W with exposed pad - sustains 190mA continuous output current at +85°C ambient without derating. |
Applications
| RGB Line Driver | Single-Supply ADC Driver |
|---|---|
Use Scenario: Driving three parallel 75Ω coaxial cables carrying red, green, and blue analog video signals from graphics processor to display panel. IC Role / Device Role / Timing Role: High-speed current-feedback buffer providing gain-of-1, low-glitch switching, and DC-coupled output swing from 0.3V to 4.7V. Use Value: 0.07%/0.02° dG/dφ preserves color accuracy; 190mA drive capability maintains signal integrity over 10m cable runs. | Use Scenario: Conditioning analog sensor output before digitization by a 10-bit, 60MSPS ADC (e.g., ADS823) in portable test equipment. IC Role / Device Role / Timing Role: AC-coupled G = +4 driver with 2.5V common-mode bias, delivering 2VPP signal with >58dBc SFDR at 20MHz. Use Value: 2100V/µs slew rate prevents slewing-induced distortion; 190MHz bandwidth supports Nyquist zone sampling up to 95MHz. |
| Wired-OR Video Multiplexer | High-Speed Imaging Channel |
Use Scenario: Selecting between two camera video streams using make-before-break switching onto a shared 75Ω coaxial output line. IC Role / Device Role / Timing Role: Dual-channel current-feedback amplifier with active-low DIS pins synchronized to vertical blanking interval. Use Value: ≤±50mV turn-on/off glitch prevents visible artifacts; 70dB off-isolation suppresses crosstalk during transition. | Use Scenario: Amplifying pixel clock-synchronized analog outputs from CMOS image sensors in medical endoscopes or machine vision cameras. IC Role / Device Role / Timing Role: DC-coupled G = +2 buffer with 12ns 0.02% settling time, driving 50Ω transmission lines to FPGA-based digitizers. Use Value: 190MHz bandwidth supports >100MP/s pixel rates; low 1.7nV/√Hz noise preserves dynamic range in low-light imaging. |
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; 1800V/µs slew rate; no disable pin; higher input offset (±1mV). | Better DC accuracy and lower noise (1.6nV/√Hz), but lacks power-down capability and exhibits gain-dependent bandwidth roll-off. | Select OPA690IDR when DC precision and ultra-low noise outweigh need for disable control or constant bandwidth vs. gain. |
| OPA2691IDR | Dual-channel version in SO-8; identical AC specs per channel; shared disable pin; 10.2mA total quiescent current. | Enables dual-path signal conditioning (e.g., differential video or I/Q baseband) in same footprint; requires coordinated DIS control. | Select OPA2691IDR when space-constrained designs require two matched current-feedback amps with synchronized disable. |
Compared with OPA690IDR, OPA691IDRG4 trades minor DC offset degradation for consistent bandwidth across gains and integrated power gating; versus OPA2691IDR, it offers half the quiescent current and single-channel optimization for cost-sensitive point-of-load buffering.
Availability
OPA691IDRG4 is available at Aetrix Electronics and suitable for RGB line driving, single-supply ADC buffering, and high-speed imaging applications requiring stable component supply, industrial temperature support, and SO-8 package compatibility.
Supply support for OPA691IDRG4 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 data converters.
The OPA691IDRG4 belongs to TI's OPAx69x current-feedback op amp family, engineered for wideband signal acquisition in video, communications, and test equipment where bandwidth stability, low distortion, and power efficiency are critical.
FAQ
What is the maximum operating supply voltage for the OPA691IDRG4?
The OPA691IDRG4 supports a maximum operating voltage of ±6V in dual-supply mode or +12V in single-supply mode. Absolute maximum ratings specify ±6.5VDC on power rails; exceeding this risks permanent damage. For reliable long-term operation, TI recommends staying within the specified operating range of ±2.5V to ±6V (dual) or +5V to +12V (single), with thermal derating applied above 70°C ambient.
Does the OPA691IDRG4 require external compensation for unity-gain stability?
No, the OPA691IDRG4 is internally compensated and unity-gain stable, delivering 280MHz small-signal bandwidth at G = +1 with 45° phase margin. This eliminates need for external compensation components in most configurations. However, optimal bandwidth flatness at G = +2 requires RF = 402Ω (±5V) or 453Ω (+5V); deviation from these values may introduce peaking or reduced stability margin.
How does the disable function affect output impedance and isolation in the OPA691IDRG4?
When disabled (DIS pin LOW), the OPA691IDRG4 output enters high-impedance state with typical capacitance of 4pF and 70dB off-isolation at 5MHz. Output impedance rises to >1MΩ, effectively decoupling the amplifier from downstream circuitry. This enables safe wired-OR multiplexing without loading adjacent channels, and prevents signal contention during power sequencing or channel switching.
Can the OPA691IDRG4 drive a 50Ω load directly in single-supply mode?
Yes, the OPA691IDRG4 can drive a 50Ω load directly from a +5V supply, delivering ≥120mA sourcing/sinking current with 1.1V–3.4V output swing (RL = 100Ω to VS/2). For 50Ω, output swing reduces slightly (e.g., ~1.2V–3.3V), but remains sufficient for 2VPP signals. Use series termination (e.g., 25Ω) at the output to match 50Ω source impedance and minimize reflections in high-frequency applications.
What is the thermal resistance (θJA) of the OPA691IDRG4 in its SO-8 package?
The OPA691IDRG4 in SO-8 (D) package has a junction-to-ambient thermal resistance (θJA) of 125°C/W, measured with JEDEC-standard 2-layer board conditions. With proper PCB copper pour (≥1 in² thermal pad connected to all four corners), actual θJA can improve to ~65°C/W, allowing continuous 190mA output current at +85°C ambient without exceeding 125°C junction limit.
OPA691IDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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
OPA691IDRG4 FAQ
1.How can I place an order for OPA691IDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA691IDRG4 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 OPA691IDRG4 reliable?
The price and inventory of OPA691IDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA691IDRG4 is usually 5 days.
3.What payment methods are accepted for OPA691IDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA691IDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA691IDRG4?
OPA691IDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA691IDRG4 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 OPA691IDRG4?
For technical support, including OPA691IDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA691IDRG4 requirements.
6.How does Aetrix verify that OPA691IDRG4 is sourced from the original manufacturer or authorized distributors?
All OPA691IDRG4 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 OPA691IDRG4 meets industry standards.
7.What is the process for return or replacement of OPA691IDRG4?
All OPA691IDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA691IDRG4, 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 OPA691IDRG4 part is unused and in its original packaging.
Return procedure for OPA691IDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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