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Texas Instruments OPA694ID
- Part No.:
- OPA694ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA694ID.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:105
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Product details
Overview
OPA694ID from Texas Instruments is a current-feedback operational amplifier designed for ultra-wideband, low-power video and RF signal conditioning. It delivers 690MHz bandwidth at +2V/V gain, 1700V/µs slew rate, 5.8mA quiescent current, and ±80mA output drive-enabling high-fidelity matrix switch buffering and ADC driver applications in ±5V systems.
For engineers reviewing the OPA694ID datasheet, OPA694ID pinout, OPA694ID application, or OPA694ID equivalent, this page provides verified specifications, SO-8 package layout, differential gain/phase performance (0.03%/0.015°), thermal resistance (125°C/W), and validated alternatives for video line driving, RF summing, and wideband instrumentation.
Technical Context
The OPA694ID implements a current-feedback architecture with 30Ω internal inverting-input impedance (RI) and open-loop transimpedance of 145kΩ at 25°C. Its bandwidth remains stable across gains (200MHz at G = +10) due to noise-gain–dependent feedback resistor optimization-not voltage-gain scaling.
It features a bootstrapped input stage for improved unity-gain flatness, <1.5V output voltage headroom into ±80mA loads, and dual-supply operation from ±3.5V to ±6.3V. The device maintains NTSC-compliant differential gain/phase error (0.03%/0.015°) under 1.4VPP swing into 150Ω, confirming suitability for broadcast-grade video routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G = +2) | 690MHz typical - enables full HD/3G-SDI signal amplification without phase distortion |
| Slew Rate | 1700V/µs minimum - supports clean 2VPP transient response in <1ns rise time |
| Supply Current | 5.8mA maximum at ±5V - allows dense integration in multi-channel video routers |
| Differential Gain/Phase Error | 0.03%/0.015° max - meets SMPTE RP-168 and ITU-R BT.601 broadcast video fidelity requirements |
| Output Drive Capability | ±80mA minimum - drives 100Ω loads with <3.4V swing, supporting active termination in RF interconnects |
| Input Voltage Noise Density | 2.1nV/√Hz typical above 1MHz - preserves SNR in 12-bit ADC front-ends up to 675MHz full-power bandwidth |
| Thermal Resistance (θJA) | 125°C/W for SO-8 - enables stable operation at 85°C ambient with ≤500mW dissipation |
Pinout & Package
OPA694ID is housed in an industry-standard SO-8 (D) package with exposed pad for thermal enhancement. Pin 1 is marked by a beveled corner or dot; pin numbering follows standard counter-clockwise orientation from top-left.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | Current-sensing node for feedback loop; requires precise RF matching (e.g., 402Ω at G = +2) to stabilize bandwidth |
| 2 | Noninverting Input (+) | High-impedance voltage reference point; CMIR extends to ±2.5V at 25°C for rail-to-rail input compatibility |
| 3 | Output | Class-AB output stage with ±80mA sourcing/sinking; supports direct 50Ω/75Ω cable drive with series termination |
| 4 | −VS | Negative supply rail connection; decoupling capacitor (0.1µF) required between Pins 4 and 8 for harmonic distortion reduction |
| 5 | NC | No internal connection; must remain unconnected per TI design guidelines |
| 6 | NC | No internal connection; must remain unconnected per TI design guidelines |
| 7 | +VS | Positive supply rail connection; optional 0.1µF capacitor between Pins 4 and 7 improves 2nd-harmonic suppression by 3–6dB |
| 8 | NC | No internal connection; must remain unconnected per TI design guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Unity-Gain Stable Bandwidth | 1.5GHz - eliminates need for external compensation in buffer configurations |
| Low Differential Phase Error | 0.015° typical - ensures minimal color timing skew in composite video transmission |
| High Full-Power Bandwidth | 675MHz - sustains 2VPP output without clipping up to UWB IF frequencies |
| Pb-Free Green SO-8 Package | RoHS-compliant, JEDEC-standard D package - supports automated optical inspection and reflow soldering |
| ESD Robustness | HBM 1500V, CDM 1000V - withstands handling in Class 1B ESD environments without parametric shift |
Applications
| Video Matrix Switch Buffer | RF SAW Filter Buffer |
|---|---|
Use Scenario: High-density broadcast router switching 16+ SDI channels with minimal crosstalk and group delay variation. IC Role / Device Role / Timing Role: Unity-gain buffer isolating mixer outputs from SAW filter impedance discontinuities while preserving 1.5GHz small-signal bandwidth. Use Value: Enables >1000-cycle MTBF in 24/7 broadcast infrastructure by eliminating differential gain drift (0.03% max) and maintaining <0.2° phase error over temperature. | Use Scenario: IF-stage amplification after downconversion, where SAW filter insertion loss must be recovered without degrading third-order intercept. IC Role / Device Role / Timing Role: Inverting gain-of-8 amplifier driving 50Ω SAW input with optimized RF/RT network for 250MHz flat response. Use Value: Delivers +15dBm 1dB compression point and >40dB third-order intercept through 70MHz-achieving RF linearity at 1/3 the quiescent power of discrete transistor solutions. |
| ADC Driver (12-bit, >100MSPS) | Differential Receiver Interface |
Use Scenario: Driving pipeline or folding ADC inputs in medical ultrasound or radar digitization systems requiring low noise and fast settling. IC Role / Device Role / Timing Role: Dual-amplifier differential driver providing 2VPP swing, 13ns 0.1% settling, and 2.1nV/√Hz input noise into 100Ω load. Use Value: Maintains ENOB >11.2 bits at 50MHz input frequency by limiting harmonic distortion to −68dBc (2nd) and −72dBc (3rd) at 5MHz. | Use Scenario: Converting single-ended RF signals (e.g., from LNA) to balanced differential pairs for IQ demodulator inputs. IC Role / Device Role / Timing Role: Precision inverting summing amplifier with matched 50Ω input impedance and 200MHz bandwidth across five inputs. Use Value: Achieves amplitude/phase balance <0.1dB/<0.3° across 10–200MHz via current-feedback topology's gain-independent bandwidth stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current-feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA695ID | Higher 3rd-order intercept (+22dBm vs +15dBm), 1.7GHz bandwidth, but 9.5mA supply current | Better suited for high-dynamic-range RF receiver front-ends; less optimal for power-constrained video routing | Select OPA695ID only when >40dB SFDR is required above 50MHz and thermal budget allows +3.7mA extra current |
| LMH6702MA | Lower 1.3mA quiescent current, 1.3GHz bandwidth, but 0.08%/0.12° differential gain/phase error | Acceptable for non-broadcast video or test equipment; fails NTSC compliance at full swing | Choose LMH6702MA for cost-sensitive, non-NTSC applications where 0.03% differential gain is not mandated |
Compared with OPA694ID, OPA695ID trades 3.7mA higher supply current for +7dBm higher IP3 and broader bandwidth-ideal for RF receiver chains-while LMH6702MA reduces power by 4.5mA but sacrifices broadcast video fidelity, making it unsuitable for SMPTE-compliant infrastructure.
Availability
OPA694ID is available at Aetrix Electronics and suitable for wideband video line driving, matrix switch buffering, and high-speed ADC driver applications requiring stable component supply across industrial temperature ranges (−40°C to +85°C).
Supply support for OPA694ID 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 video signal integrity.
The OPA694ID belongs to TI's precision current-feedback amplifier product line, engineered specifically for broadcast video routing, RF instrumentation, and high-resolution data acquisition systems demanding sub-0.05% differential gain accuracy and GHz-class bandwidth.
FAQ
What is the maximum operating supply voltage for the OPA694ID?
The OPA694ID supports a maximum operating voltage range of ±6.3V DC, as specified in the Absolute Maximum Ratings table. Operation beyond this limit risks permanent damage. For reliable long-term performance, TI recommends staying within the specified ±5V nominal supply range used in all electrical characterization, where the device achieves its published 690MHz bandwidth and 1700V/µs slew rate. The OPA694ID datasheet confirms this rating applies to both SO-8 and SOT23-5 packages.
Does the OPA694ID require external compensation capacitors for stability?
No, the OPA694ID is unity-gain stable and does not require external compensation capacitors. Its current-feedback architecture inherently maintains stability across gains from +1V/V to +10V/V when using recommended feedback resistors (e.g., 402Ω at G = +2). However, a 0.1µF capacitor between +VS and −VS pins is recommended to reduce 2nd-harmonic distortion by 3–6dB-this is a decoupling measure, not compensation. The OPA694ID evaluation boards (DEM-OPA-SO-1B) validate this behavior in production layouts.
Can the OPA694ID drive a 75Ω coaxial cable directly?
Yes, the OPA694ID can drive a 75Ω coaxial cable directly using series output termination. With ±80mA output drive capability and ±3.4V swing into 100Ω, it delivers ≥1.4VPP into 75Ω loads-sufficient for RG-59 video standards. TI's application note SBOS319G shows a G = +2 configuration with 402Ω feedback and 75Ω series output resistor achieving 0.03%/0.015° differential gain/phase error. No external buffer or transformer is needed for baseband video line driving.
What is the thermal resistance (θJA) of the OPA694ID in SO-8 package?
The OPA694ID in SO-8 (D) package has a junction-to-ambient thermal resistance (θJA) of 125°C/W, as documented in the Thermal Characteristics table of the SBOS319G datasheet. This value assumes standard JEDEC 2-layer board conditions. With 5.8mA quiescent current at ±5V (58mW static power), the junction temperature rise is ≤7.25°C above ambient-well within the −40°C to +85°C operating range. The exposed pad variant (D package) further enhances thermal performance in high-density PCB layouts.
Is the OPA694ID pin-compatible with the OPA658?
No, the OPA694ID is not pin-compatible with the OPA658. While both are current-feedback op amps, the OPA658 uses an SO-8 package with different pin assignments: Pin 1 is +VS, Pin 4 is Output, and Pin 5 is −VS-whereas the OPA694ID assigns Pin 1 to Inverting Input and Pin 4 to −VS. TI explicitly positions the OPA694ID as an "improved replacement for OPA658" in functionality (bandwidth, power, video specs), not mechanical compatibility. Board redesign is required for substitution.
OPA694ID Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1700V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 1.5 GHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 5.8mA
- Current - Output / Channel:
- 80 mA
- Voltage - Supply Span (Min):
- 7 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA694ID FAQ
1.How can I place an order for OPA694ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA694ID 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 OPA694ID reliable?
The price and inventory of OPA694ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA694ID is usually 5 days.
3.What payment methods are accepted for OPA694ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA694ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA694ID?
OPA694ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA694ID 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 OPA694ID?
For technical support, including OPA694ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA694ID requirements.
6.How does Aetrix verify that OPA694ID is sourced from the original manufacturer or authorized distributors?
All OPA694ID 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 OPA694ID meets industry standards.
7.What is the process for return or replacement of OPA694ID?
All OPA694ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA694ID, 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 OPA694ID part is unused and in its original packaging.
Return procedure for OPA694ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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