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Texas Instruments OPA694IDRG4
- Part No.:
- OPA694IDRG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA694IDRG4.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,363
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Product details
Overview
OPA694IDRG4 from Texas Instruments is a current-feedback operational amplifier optimized for wideband video line driving, ADC buffering, and RF signal conditioning. It delivers 690MHz bandwidth at +2V/V gain, 1700V/µs slew rate, ±80mA output drive, and 0.03%/0.015° NTSC differential gain/phase error - enabling high-fidelity analog video transmission over RG-59 coaxial cable.
For engineers reviewing the OPA694IDRG4 datasheet, OPA694IDRG4 pinout, OPA694IDRG4 application, or OPA694IDRG4 equivalent, this page provides verified technical context, package-specific pin mapping, real-world application constraints, and validated alternative options for video routing, differential receiver, and SAW pre-amplifier designs.
Technical Context
The OPA694IDRG4 uses a current-feedback architecture with ~30Ω inverting input impedance and open-loop transimpedance of 145kΩ at 25°C. Its bandwidth remains stable across gains (e.g., 200MHz at G=+10) due to noise-gain–dependent feedback resistor optimization rather than voltage-gain dependency.
It features an improved output stage delivering ±80mA into 100Ω with <1.5V headroom at ±5V supplies, low 2.1nV/√Hz input voltage noise, and 22pA/√Hz inverting input current noise - making it suitable for driving 75Ω/100Ω video loads and high-speed ADC inputs without external level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-Signal Bandwidth (G=+2) | 690MHz typical - supports full HD video baseband and IF signals up to 350MHz with ≤0.1dB gain flatness. |
| Slew Rate | 1700V/µs minimum - enables clean 2VPP pulse response with 0.8ns rise/fall time and 13ns settling to 0.1%. |
| Output Drive | ±80mA into 100Ω load - sufficient to drive dual 75Ω video lines or 50Ω RF paths without external buffers. |
| Differential Gain/Phase Error | 0.03%/0.015° at 1.4VPP into 150Ω - meets broadcast-grade NTSC/PAL timing fidelity requirements. |
| Supply Current | 5.8mA typical at ±5V - enables high-density video router designs with >500MHz per-channel bandwidth and low thermal load. |
| Input Voltage Noise Density | 2.1nV/√Hz above 1MHz - preserves SNR in 12-bit ADC driver applications where noise floor dominates resolution. |
| Harmonic Distortion (2nd/3rd) | –68dBc/–72dBc at 5MHz, 2VPP, 100Ω - ensures minimal intermodulation in multi-tone RF and composite video systems. |
Pinout & Package
SOT-23-5 package (DBV), 5-pin surface-mount, exposed pad not electrically connected. Pin 1 marked by dot; pin orientation matches TI standard top-view marking "BIA".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Output) | Amplifier output node | Drives 50Ω/75Ω/100Ω loads directly; requires series 50Ω termination for RF matching or 75Ω for video line driving. |
| 2 (–VS) | Negative supply rail | Connect to –5V with local 0.1µF decoupling to ground; optional 0.1µF capacitor between +VS and –VS improves 2nd-harmonic distortion. |
| 3 (Noninverting Input) | High-impedance reference input | DC-coupled input path; common-mode range ±2.5V at 25°C; bias current ±5µA max limits high-Z source use. |
| 4 (+VS) | Positive supply rail | Connect to +5V with local 0.1µF decoupling to ground; supports operation from ±3.5V to ±6.3V supplies. |
| 5 (Inverting Input) | Low-impedance summing node | ~30Ω dynamic impedance; sets closed-loop bandwidth via RF value; requires matched RF/RG for gain accuracy and stability. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable | 1.5GHz bandwidth at G=+1 - eliminates need for external compensation in buffer configurations. |
| Current-feedback architecture | Bandwidth independent of closed-loop gain - maintains 200MHz at G=+10, unlike voltage-feedback op amps. |
| Low differential gain/phase error | 0.03%/0.015° - meets SMPTE 253M and ITU-R BT.470 broadcast video linearity standards. |
| Pb-free SOT-23-5 package | RoHS-compliant, green marking "BIA" - compatible with lead-free reflow profiles and high-density PCB layouts. |
| High output current | ±80mA sink/source - drives back-terminated 75Ω video lines or 50Ω RF paths without external emitter followers. |
Applications
| Video Line Driver | ADC Driver |
|---|---|
Use Scenario: Driving composite NTSC/PAL video signals over 100m RG-59 coaxial cable in broadcast routing switchers. IC Role / Device Role / Timing Role: Unity-gain buffer with DC coupling, maintaining signal integrity across 0–5.5MHz baseband. Use Value: 0.03% differential gain error ensures color fidelity; 675MHz large-signal bandwidth prevents edge ringing on sync pulses. |
Use Scenario: Buffering 100MHz IF signals into 12-bit, 105MSPS ADCs in software-defined radio front ends. IC Role / Device Role / Timing Role: Single-ended-to-differential driver with 2VPP swing and low harmonic distortion. Use Value: –72dBc 3rd-harmonic distortion at 5MHz preserves SFDR; 2.1nV/√Hz noise avoids degrading ENOB below 11.2 bits. |
| Differential Receiver | SAW Filter Buffer |
Use Scenario: Reconstructing balanced IF signals after passive hybrid couplers in satellite LNB downconverters. IC Role / Device Role / Timing Role: Inverting summing amplifier converting two 50Ω single-ended paths into one differential output. Use Value: 200MHz flat bandwidth supports 24MHz DVB-S2 channel bandwidth; ±80mA drive sustains 50Ω termination on both legs. |
Use Scenario: Isolating mixer output from narrowband SAW filter input in 450MHz IF strips with 12dB insertion loss. IC Role / Device Role / Timing Role: High-Z gain-of-–8 inverting amplifier providing 50Ω input match and 50Ω output drive. Use Value: 250MHz bandwidth exceeds SAW passband; low 22pA/√Hz current noise minimizes degradation of filter's noise figure. |
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 (+26dBm vs +22dBm), 1.7GHz G=+1 bandwidth, but 7.5mA supply current. | Better suited for >70MHz RF amplification where spurious suppression is critical; less optimal for low-power video routing. | Select OPA695ID only when >200MHz 3rd-harmonic suppression is required and 29% higher quiescent current is acceptable. |
| OPA683ID | Lower power (3.5mA), 1.5GHz G=+1 bandwidth, but reduced output drive (±45mA) and higher differential phase (0.05°). | Targeted at portable video equipment where thermal density matters more than broadcast-level timing fidelity. | Choose OPA683ID for battery-powered or space-constrained designs where 0.015° phase margin is noncritical. |
Compared with OPA694IDRG4, OPA695ID trades 1.7mA extra supply current for superior RF linearity, while OPA683ID reduces power by 40% at the cost of video timing precision and output current - making OPA694IDRG4 the balanced choice for professional video infrastructure requiring both fidelity and efficiency.
Availability
OPA694IDRG4 is available at Aetrix Electronics and suitable for wideband video line driver, matrix switch buffer, and ADC driver applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.
Supply support for OPA694IDRG4 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 conditioning.
The OPA694IDRG4 belongs to TI's high-performance current-feedback op amp product line, engineered specifically for broadcast video infrastructure, high-density video routers, and RF signal chain buffering where bandwidth, linearity, and low power must coexist.
FAQ
What is the maximum operating supply voltage for the OPA694IDRG4?
The OPA694IDRG4 supports a maximum operating voltage range of ±6.3V, with absolute maximum ratings of ±6.5V for the power supply pins. Operation beyond ±6.3V risks exceeding internal junction temperature limits and may degrade long-term reliability. For robust design, TI recommends staying within ±5V nominal supply with ±10% tolerance, as all key AC specifications (e.g., 690MHz bandwidth, 1700V/µs slew rate) are characterized at ±5V.
Can the OPA694IDRG4 drive a 75Ω video load directly?
Yes, the OPA694IDRG4 can drive a 75Ω video load directly using a series 75Ω output resistor (e.g., Figure 31 test circuit). At ±5V supplies, it delivers ±3.4V output swing into 100Ω and maintains 0.03%/0.015° NTSC differential gain/phase error - meeting broadcast video linearity standards. For RG-59 coaxial runs, ensure proper termination and minimize stub lengths to preserve 675MHz large-signal bandwidth.
Is the OPA694IDRG4 pin-compatible with the OPA658?
No, the OPA694IDRG4 is not pin-compatible with the OPA658. The OPA658 uses an SO-8 package with different pin assignments (e.g., NC pins at 1 and 5), while the OPA694IDRG4 uses SOT-23-5 with Output/–VS/Noninv/+VS/Inv pinout. Though both are current-feedback amplifiers and the OPA694IDRG4 is positioned as an "improved replacement," PCB layout changes are required for substitution due to differing footprint, pin count, and terminal functions.
What feedback resistor value gives optimal bandwidth for G=+2 in the OPA694IDRG4?
For G=+2 noninverting configuration, TI specifies RF = 402Ω as the optimal feedback resistor value to achieve 690MHz small-signal bandwidth and 675MHz large-signal bandwidth. This value balances noise gain, stability, and parasitic capacitance effects. Deviating significantly (e.g., RF < 300Ω or > 500Ω) causes peaking or bandwidth roll-off, as shown in Figure 1 and the "Setting Resistor Values to Optimize Bandwidth" section of the SBOS319G datasheet.
Does the OPA694IDRG4 require external compensation for unity-gain stability?
No, the OPA694IDRG4 is unity-gain stable with 1.5GHz bandwidth at G=+1 and does not require external compensation. However, the unity-gain frequency response exhibits ~2dB peaking (Figure 37), which can cause overshoot in pulse applications. TI recommends the bootstrapped RG circuit in Figure 36 to flatten response and improve pulse fidelity - especially critical in digital video clock recovery and fast-edge ADC sampling.
OPA694IDRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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
OPA694IDRG4 FAQ
1.How can I place an order for OPA694IDRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA694IDRG4 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 OPA694IDRG4 reliable?
The price and inventory of OPA694IDRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA694IDRG4 is usually 5 days.
3.What payment methods are accepted for OPA694IDRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA694IDRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA694IDRG4?
OPA694IDRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA694IDRG4 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 OPA694IDRG4?
For technical support, including OPA694IDRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA694IDRG4 requirements.
6.How does Aetrix verify that OPA694IDRG4 is sourced from the original manufacturer or authorized distributors?
All OPA694IDRG4 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 OPA694IDRG4 meets industry standards.
7.What is the process for return or replacement of OPA694IDRG4?
All OPA694IDRG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA694IDRG4, 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 OPA694IDRG4 part is unused and in its original packaging.
Return procedure for OPA694IDRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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