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Texas Instruments OPA842IDR
- Part No.:
- OPA842IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA842IDR.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:19,900
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Product details
Overview
OPA842IDR 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 third-harmonic distortion at 5MHz, and 22ns 0.01% settling time-enabling precision buffering of 14-bit, 10MSPS ADCs like the ADS850.
For engineers reviewing the OPA842IDR datasheet, OPA842IDR pinout, OPA842IDR application, or OPA842IDR equivalent, key selection criteria include its ±5V supply operation, SO-8 package thermal resistance (125°C/W), differential gain/phase error (0.003%/0.008°), and compatibility with ac-coupled high-resolution imaging and professional audio front-ends.
Technical Context
The OPA842IDR employs a two-stage voltage-feedback architecture that enables unity-gain stability while achieving 200MHz gain-bandwidth product and 110dB open-loop gain. Its differential input stage provides bias current cancellation and low inverting current noise-critical for maintaining dc accuracy in transimpedance and differential amplifier configurations.
It supports wideband applications up to 150MHz closed-loop bandwidth (G = +2), exhibits 0.1dB gain flatness to 56MHz, and maintains <0.01% settling in 22ns-making it suitable for fast-settling, low-noise analog signal chains where harmonic distortion and phase linearity directly impact SFDR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-Gain Bandwidth | 400MHz - enables stable G = +1 operation without external compensation, ideal for ADC input buffers and video line drivers. |
| Input Voltage Noise | 2.6nV/√Hz - ensures minimal added noise when amplifying low-level signals in 14-bit data acquisition systems. |
| Harmonic Distortion | –93dBc (3rd harmonic, 5MHz) - preserves signal integrity in professional audio and IF amplifier stages requiring >92dB SFDR. |
| Settling Time (0.01%) | 22ns - supports accurate sampling of fast transient signals in 10MSPS ADC interfaces like ADS850. |
| Differential Gain/Phase | 0.003%/0.008° - meets broadcast-grade video performance for NTSC composite signal distribution. |
| Supply Voltage Range | ±3.5V to ±6V - allows flexible biasing in industrial and test instrumentation systems using standard ±5V rails. |
| Quiescent Current | 20.2mA (typ, ±5V) - balances speed and power efficiency in continuous high-bandwidth operation. |
Pinout & Package
OPA842IDR is housed in an SO-8 (D) package with exposed pad not electrically connected. Thermal resistance θJA is 125°C/W. Pin 1 is marked by a dot or beveled corner per TI package marking convention (OAQI).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connection | Internally unconnected; must remain floating or grounded per layout best practices to avoid parasitic coupling. |
| 2 (+VS) | Positive Supply | Accepts +5V (±3.5V to ±6V range); requires local 0.1µF ceramic decoupling to ground for low-noise operation. |
| 3 (Output) | Amplifier Output | Drives ≥100Ω loads; output swing is ±2.8V (RL = 100Ω) and ±3.2V (RL > 1kΩ) at ±5V supplies. |
| 4 (NC) | No Connection | Internally unconnected; no routing or soldering required. |
| 5 (NC) | No Connection | Internally unconnected; leave unconnected on PCB. |
| 6 (Inverting Input) | Inverting Input Terminal | High-impedance node; matched external resistors required for bias current cancellation in precision circuits. |
| 7 (Noninverting Input) | Noninverting Input Terminal | Used for single-ended or differential input configurations; common-mode range extends to ±3.2V at ±5V supply. |
| 8 (–VS) | Negative Supply | Accepts –5V (±3.5V to ±6V range); requires symmetric decoupling to maintain PSRR >85dB. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stability | Eliminates need for external compensation components in G = +1 configurations-reducing BOM count and board area in ADC buffer designs. |
| Low 0.003%/0.008° differential error | Enables direct use in broadcast video line drivers without post-amplifier correction circuitry or calibration. |
| 22ns 0.01% settling time | Supports full-scale step response fidelity in 10MSPS data converters, preserving effective number of bits (ENOB) in high-resolution imaging. |
| 110dB open-loop gain | Ensures <0.001% gain error in precision gain-of-2 configurations used in professional audio summing and mixing stages. |
| ±5V operation with 20.2mA IQ | Delivers RF-grade bandwidth while remaining compatible with legacy ±5V test equipment and industrial control power domains. |
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 an ac-coupled data acquisition system. IC Role / Device Role / Timing Role: High-speed, low-noise buffer isolating the ADC's switched-capacitor input from source impedance variations and minimizing charge kickback. Use Value: Achieves >92dB SFDR at 5MHz by contributing only –93dBc harmonic distortion and 22ns settling-preserving full ENOB without external RC filtering. | Use Scenario: Amplifying intermediate frequency (IF) signals in communications receivers operating at 5–10MHz. IC Role / Device Role / Timing Role: Low-phase-noise, linear gain block placed between mixer and demodulator to maintain EVM and adjacent channel power ratio (ACPR). Use Value: Delivers –93dBc third-harmonic distortion and 56MHz 0.1dB gain flatness-ensuring minimal spectral regrowth in QAM and OFDM signal paths. |
| Professional Audio Line Driver | High-Resolution Imaging Signal Chain |
Use Scenario: Driving balanced analog outputs in digital audio workstations and studio monitors requiring ultra-low THD+N. IC Role / Device Role / Timing Role: Unity-gain stable output stage delivering high slew rate (400V/µs) and low differential phase error into 150Ω loads. Use Value: Maintains 0.003%/0.008° differential gain/phase and <0.0005% THD+N across 20Hz–20kHz-meeting AES17 and IEC 60268 standards. | Use Scenario: Conditioning analog outputs from X-ray or MRI sensor arrays prior to digitization at 10MSPS. IC Role / Device Role / Timing Role: Low-noise, fast-settling amplifier ensuring minimal temporal blurring and spatial distortion in time-domain signal reconstruction. Use Value: 2.6nV/√Hz input noise and 22ns 0.01% settling preserve dynamic range and spatial resolution in medical-grade image capture. |
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 |
|---|---|---|---|
| OPA843IDR | Lower input voltage noise (2.0nV/√Hz), higher GBP (800MHz), but requires minimum gain of +5 for stability. | Not unity-gain stable; unsuitable for G = +1 ADC buffers unless gain is increased to +5 or higher. | Select OPA843IDR only when gain ≥+5 is acceptable and lower noise is prioritized over unity-gain flexibility. |
| OPA642U | Higher quiescent current (25mA), lower unity-gain bandwidth (350MHz), and higher distortion (–85dBc at 5MHz). | Legacy upgrade path; lacks OPA842IDR's differential gain/phase performance and 0.01% settling speed. | Choose OPA642U only for cost-sensitive, lower-performance replacements where 0.003%/0.008° video specs are not required. |
Compared with OPA842IDR, OPA843IDR offers superior noise and bandwidth but sacrifices unity-gain stability-requiring redesign of feedback networks-while OPA642U trades speed and linearity for lower cost and broader legacy support, making it less suitable for 14-bit, 10MSPS signal chains demanding <22ns settling and <0.01% differential error.
Availability
OPA842IDR is available at Aetrix Electronics and suitable for high-resolution imaging, professional audio line driving, and test instrumentation applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for OPA842IDR 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 data converter interface solutions.
The OPA842IDR belongs to TI's high-speed precision op amp product line, engineered specifically for applications demanding simultaneous wide bandwidth, ultra-low distortion, and dc accuracy-including ADC buffering, video distribution, and communications infrastructure.
FAQ
What is the maximum recommended supply voltage for OPA842IDR?
The absolute maximum supply voltage for OPA842IDR is ±6.5V DC, but the specified operating range is ±3.5V to ±6V. For reliable long-term operation with full parameter guarantees, TI recommends using ±5V supplies. Exceeding ±6V risks permanent damage, and operation below ±3.5V may degrade bandwidth and output swing. The OPA842IDR achieves optimal harmonic distortion and settling performance at ±5V.
Does OPA842IDR require external compensation for unity-gain operation?
No, OPA842IDR is explicitly designed as unity-gain stable and does not require external compensation capacitors. Its internal voltage-feedback architecture ensures stability at G = +1 with 400MHz bandwidth. This eliminates the need for destabilizing series resistors or feedback capacitors-simplifying layout and improving reproducibility in ADC buffer and video driver applications.
Can OPA842IDR drive a 50Ω load directly?
Yes, OPA842IDR can drive a 50Ω load, but output swing is reduced: ±2.6V (positive) and ±3.1V (negative) at ±5V supplies. For full ±3.2V swing, use RL > 1kΩ. When driving 50Ω, ensure proper termination and consider adding a small series resistor (e.g., 5–10Ω) near the output pin to dampen potential peaking caused by PCB trace inductance and load capacitance.
What is the thermal resistance (θJA) of the OPA842IDR SO-8 package?
The junction-to-ambient thermal resistance (θJA) for OPA842IDR in the SO-8 (D) package is 125°C/W under standard JEDEC 2-layer board conditions. This value assumes adequate copper pour and thermal vias beneath the exposed pad (if present). For continuous 20.2mA operation at ±5V, junction temperature rise is ~25°C above ambient-well within the –40°C to +85°C operating range.
How does OPA842IDR compare to OPA642 in ADC buffer applications?
OPA842IDR outperforms OPA642 in ADC buffer applications with 400MHz vs. 350MHz unity-gain bandwidth, –93dBc vs. –85dBc harmonic distortion at 5MHz, and 22ns vs. 35ns 0.01% settling time. Its 0.003%/0.008° differential gain/phase also exceeds OPA642's typical 0.01%/0.05°, making OPA842IDR the preferred choice for 14-bit, 10MSPS systems like ADS850 where SFDR and temporal fidelity are critical.
OPA842IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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
OPA842IDR FAQ
1.How can I place an order for OPA842IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA842IDR 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 OPA842IDR reliable?
The price and inventory of OPA842IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA842IDR is usually 5 days.
3.What payment methods are accepted for OPA842IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA842IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA842IDR?
OPA842IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA842IDR 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 OPA842IDR?
For technical support, including OPA842IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA842IDR requirements.
6.How does Aetrix verify that OPA842IDR is sourced from the original manufacturer or authorized distributors?
All OPA842IDR 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 OPA842IDR meets industry standards.
7.What is the process for return or replacement of OPA842IDR?
All OPA842IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA842IDR, 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 OPA842IDR part is unused and in its original packaging.
Return procedure for OPA842IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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