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Texas Instruments OPA842ID
- Part No.:
- OPA842ID
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA842ID.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:450
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Product details
Overview
OPA842ID from Texas Instruments is a unity-gain stable, voltage-feedback operational amplifier optimized for high-speed, low-distortion signal conditioning. It delivers 400MHz unity-gain bandwidth, 2.6nV/√Hz input voltage noise, –93dBc harmonic distortion at 5MHz, and 22ns 0.01% settling time - enabling precision ADC buffering and professional video line driving in ±5V systems.
For engineers reviewing the OPA842ID datasheet, OPA842ID pinout, OPA842ID application, or OPA842ID equivalent, key selection criteria include its 110dB open-loop gain, ±3.2V common-mode input range, 100mA output drive capability, and SO-8 package compatibility with high-density analog layouts requiring minimal board area and thermal resistance of 125°C/W.
Technical Context
The OPA842ID employs a two-stage voltage-feedback architecture that enables unity-gain stability without external compensation while maintaining 200MHz gain-bandwidth product and 400V/µs slew rate. Its differential input stage provides 95dB CMRR and 100dB PSRR, supporting accurate dc-coupled operation across –40°C to +85°C.
It achieves –93dBc third-harmonic distortion at 5MHz with 2VPP output into 500Ω, and maintains 56MHz bandwidth for 0.1dB gain flatness at G = +2 - making it suitable for wideband active filtering, IF amplification, and differential receiver front-ends where phase linearity and transient fidelity are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 400MHz - supports stable closed-loop operation down to G = +1 with no external compensation required. |
| Gain-Bandwidth Product | 200MHz - defines maximum usable bandwidth at higher gains (e.g., 21MHz at G = +10). |
| Input Voltage Noise | 2.6nV/√Hz - enables high-resolution signal amplification without degrading SNR in 14-bit ADC interfaces like ADS850. |
| Harmonic Distortion | –93dBc (3rd harmonic, 5MHz, 2VPP, 500Ω) - meets professional video and test instrumentation THD requirements. |
| Settling Time | 22ns to 0.01% - ensures accurate sampling in 10MSPS+ data acquisition systems with minimal aperture uncertainty. |
| Open-Loop Gain | 110dB - provides <0.001% gain error in precision buffer configurations with moderate feedback network impedance. |
| Supply Voltage Range | ±3.5V to ±6V - operates reliably from ±5V rails with 20.2mA quiescent current, supporting industrial power budgets. |
Pinout & Package
OPA842ID is packaged in an 8-pin SOIC (SO-8) with standard pin orientation and D package marking "OPA842". Thermal resistance is 125°C/W (junction-to-ambient), and the device requires ESD handling per TI's 2000V HBM specification.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connection | Internally unused; must be left floating or tied to ground per layout best practices. |
| 2 (+VS) | Positive Supply | Connects to +5V rail with local 0.1µF ceramic decoupling capacitor for low-impedance high-frequency return path. |
| 3 (Output) | Amplifier Output | Drives up to ±100mA; requires series isolation resistor when interfacing capacitive loads (e.g., ADC inputs). |
| 4 (NC) | No Connection | Internally unused; no routing or connection recommended. |
| 5 (NC) | No Connection | Internally unused; maintain clearance per TI's SO-8 layout guidelines. |
| 6 (Inverting Input) | Inverting Input Terminal | High-impedance node; match trace length and impedance to noninverting input to preserve CMRR above 1MHz. |
| 7 (Noninverting Input) | Noninverting Input Terminal | DC-biased via matched resistors (e.g., 147Ω to ground in Figure 38) to cancel input bias current effects. |
| 8 (–VS) | Negative Supply | Connects to –5V rail with local 0.1µF ceramic decoupling capacitor adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-Gain Stability | Operates stably at G = +1 without external compensation, simplifying design of low-gain video drivers and integrators. |
| Low Distortion Architecture | –93dBc 3rd-harmonic at 5MHz enables >82dB SFDR in 14-bit ADC buffers like ADS850 without performance degradation. |
| Differential Gain/Phase Performance | 0.003%/0.008° at NTSC frequencies ensures broadcast-grade color fidelity in professional video distribution systems. |
| High Output Drive | ±100mA sourcing/sinking capability supports direct driving of 75Ω video cables and 100Ω test instrumentation loads. |
| Wide Common-Mode Range | ±3.2V input range at ±5V supplies allows rail-to-rail signal handling in ac-coupled and dc-coupled configurations. |
Applications
| ADC/DAC Buffer Driver | Low-Distortion IF Amplifier |
|---|---|
Use Scenario: Driving the analog input of a 14-bit, 10MSPS SAR ADC (e.g., ADS850) in a high-dynamic-range data acquisition system. IC Role / Device Role / Timing Role: Precision voltage buffer providing low-noise, fast-settling signal conditioning ahead of sampling instant. Use Value: 22ns 0.01% settling time and 2.6nV/√Hz noise preserve full 14-bit ENOB; –93dBc distortion prevents harmonic folding into Nyquist band. | Use Scenario: Amplifying intermediate frequency signals in communications receivers operating at 5–10MHz. IC Role / Device Role / Timing Role: High-linearity, wideband gain block in IF chain before demodulation or digitization. Use Value: 400MHz unity-gain bandwidth and –93dBc distortion ensure clean spectral purity; 110dB open-loop gain supports precise gain control via feedback. |
| Professional Video Line Driver | Active Filter Configuration |
Use Scenario: Driving 75Ω coaxial video cables in broadcast equipment with NTSC/PAL composite video signals. IC Role / Device Role / Timing Role: Unity-gain stable voltage amplifier configured as G = +2 line driver to compensate for cable attenuation. Use Value: 0.003%/0.008° differential gain/phase error preserves color fidelity; 100mA output drives long cable runs without sag. | Use Scenario: Implementing high-Q, low-phase-distortion active filters in test instrumentation front-ends. IC Role / Device Role / Timing Role: Core gain element in Sallen-Key or multiple-feedback topologies requiring wide bandwidth and low noise. Use Value: 200MHz GBW and 2.6nV/√Hz noise enable sharp roll-off and minimal group delay variation up to 50MHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA843 | Higher GBP (800MHz), lower input voltage noise (2.0nV/√Hz), but requires minimum G = +5 for stability. | Not unity-gain stable; unsuitable for G = +1 video drivers or integrators without redesign. | Select OPA843 only when gain ≥ +5 is acceptable and ultra-low noise at >10MHz is prioritized over flexibility. |
| OPA642 | Lower GBP (500MHz), higher input voltage noise (3.2nV/√Hz), unity-gain stable, older generation process. | Higher distortion (–82dBc at 5MHz); less suitable for 14-bit ADC buffering or professional video. | Choose OPA642 only for cost-sensitive legacy designs where 400MHz bandwidth and –93dBc are not required. |
Compared with OPA842ID, OPA843 offers superior noise and bandwidth but sacrifices unity-gain stability, while OPA642 trades off distortion and noise for broader legacy support - making OPA842ID the optimal balance of speed, linearity, and design simplicity for G = +1 to +10 applications.
Availability
OPA842ID is available at Aetrix Electronics and suitable for high-speed data acquisition, professional video infrastructure, and test instrumentation requiring stable component supply with guaranteed SO-8 packaging and industrial temperature range (–40°C to +85°C).
Supply support for OPA842ID 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-performance op amps and precision signal chains.
The OPA842ID belongs to TI's OPAx842 family of wideband, low-distortion voltage-feedback op amps designed specifically for demanding applications including ADC buffering, video distribution, and high-fidelity IF amplification.
FAQ
What is the maximum operating supply voltage for OPA842ID?
The OPA842ID supports a maximum operating supply voltage of ±6V, with specified operation from ±3.5V to ±6V. At ±5V, it draws 20.2mA quiescent current and delivers full AC/DC performance across –40°C to +85°C. Exceeding ±6V risks permanent damage per absolute maximum ratings.
Does OPA842ID require external compensation for unity-gain stability?
No, OPA842ID is internally compensated for unity-gain stability and operates robustly at G = +1 without external components. This is confirmed in the datasheet's FEATURES section and validated by 400MHz unity-gain bandwidth and stable frequency response plots (Figures 1–4). External compensation is unnecessary and not recommended.
Can OPA842ID drive a 75Ω video load directly?
Yes, OPA842ID can drive a 75Ω video load directly when configured as a G = +2 line driver, delivering ±3.0V output swing into 100Ω and maintaining 0.003%/0.008° differential gain/phase. For 75Ω systems, replace 50Ω resistors in reference circuits (e.g., Figure 37) with 75Ω values and verify layout parasitics do not degrade flatness above 5MHz.
What is the typical input offset voltage for OPA842ID?
The typical input offset voltage for OPA842ID is ±0.30mV at +25°C, with a maximum of ±1.5mV over the full –40°C to +85°C temperature range. This low offset supports precision dc-coupled applications such as sensor signal conditioning and active filter DC biasing without significant calibration overhead.
How does OPA842ID perform when buffering the ADS850 ADC?
OPA842ID is explicitly referenced in the datasheet as an interface solution for the ADS850 14-bit ADC. With 22ns 0.01% settling time, 2.6nV/√Hz noise, and >92dB SFDR at 5MHz, it preserves the ADS850's dynamic range without degradation - confirmed by the front-page application circuit and SBOS267D Section "Buffering High-Performance ADCs".
OPA842ID 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:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 400V/µs
- Gain Bandwidth Product:
- 200 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 20 µA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 20.2mA
- Current - Output / Channel:
- 100 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA842ID FAQ
1.How can I place an order for OPA842ID through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA842ID 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 OPA842ID reliable?
The price and inventory of OPA842ID are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA842ID is usually 5 days.
3.What payment methods are accepted for OPA842ID?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA842ID transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA842ID?
OPA842ID orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA842ID 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 OPA842ID?
For technical support, including OPA842ID datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA842ID requirements.
6.How does Aetrix verify that OPA842ID is sourced from the original manufacturer or authorized distributors?
All OPA842ID 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 OPA842ID meets industry standards.
7.What is the process for return or replacement of OPA842ID?
All OPA842ID units undergo pre-shipment inspection (PSI). If there is an issue with OPA842ID, 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 OPA842ID part is unused and in its original packaging.
Return procedure for OPA842ID:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
OPA842ID Tags
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