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Texas Instruments OPA820IDR
- Part No.:
- OPA820IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA820IDR.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,036
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Product details
Overview
OPA820IDR from Texas Instruments is a unity-gain stable, low-noise voltage-feedback operational amplifier optimized for high-speed precision signal conditioning. It delivers 240 MHz small-signal bandwidth at G = 2, 2.5 nV/√Hz input voltage noise, ±110 mA output current, and operates from ±2.5 V to ±6 V or single 5 V to 12 V supplies - enabling use in ADC preamplifiers, video line drivers, and portable test equipment.
For engineers reviewing the OPA820IDR datasheet, OPA820IDR pinout, OPA820IDR application, or OPA820IDR equivalent, key selection criteria include its 800-MHz unity-gain bandwidth with <1-dB peaking, rail-compatible output swing on 5-V supply (±3.5 V no-load), differential gain/phase of 0.01%/0.03° for composite video, and SOIC-8 package compatibility with industry-standard layouts.
Technical Context
The OPA820IDR employs a voltage-feedback architecture with fully compensated internal compensation for guaranteed unity-gain stability. Its high slew rate (240 V/µs typ. at ±5 V) and low distortion (–85 dBc 2nd-harmonic at 1 MHz) support fast settling (18 ns to 0.1%) and accurate pulse amplification without overshoot.
Designed for wide common-mode range (±3.8 V at ±5 V supply) and high DC precision (±750 µV max input offset voltage, ±400 nA max input offset current), it maintains performance across –40°C to +85°C while delivering 5.6 mA quiescent current - balancing speed, noise, and power efficiency in analog front-end stages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Small-signal BW (G = 2) | 240 MHz typical at ±5 V - enables >10 MSPS signal chain sampling with minimal phase lag |
| Input voltage noise | 2.5 nV/√Hz - preserves SNR in low-level sensor and CCD channel amplification |
| Output current | ±110 mA typical - drives 100 Ω loads directly, eliminating external buffers in video/ADC interfaces |
| Unity-gain bandwidth | 800 MHz with <1-dB peaking - supports stable G = 1 configurations for transimpedance or buffer use |
| Supply range | Single 5–12 V or dual ±2.5–±6 V - fits industrial, portable, and mixed-supply systems without level-shifting |
| DC accuracy (25°C) | ±750 µV max VOS, ±400 nA max IOS - ensures <0.1% absolute error in 14-bit ADC preamp applications |
| Differential gain/phase | 0.01% / 0.03° - meets NTSC/PAL video line driver specs without external calibration |
Pinout & Package
OPA820IDR is supplied in an 8-pin SOIC (D package) with 4.90 mm × 3.91 mm body size, optimized for thermal performance (RθJA = 125°C/W) and PCB layout compatibility with legacy op-amp footprints.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | NC | No connection - must be left floating; not internally bonded |
| 2 | Inverting Input (–) | Differential input node; high-impedance (6 MΩ || 1 pF) for feedback network attachment |
| 3 | Noninverting Input (+) | Differential input node; matched impedance to Pin 2 for common-mode rejection |
| 4 | –VS | Negative supply rail - requires low-ESR decoupling ≤10 cm from pin for stability |
| 5 | NC | No connection - must be left floating; not internally bonded |
| 6 | Output | Class-AB output stage capable of ±110 mA sink/source into 100 Ω load |
| 7 | +VS | Positive supply rail - accepts 5–12 V single or ±2.5–±6 V dual supply |
| 8 | NC | No connection - must be left floating; not internally bonded |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable | Guaranteed stability at G = 1 without external compensation - simplifies buffer and transimpedance designs |
| Low-noise architecture | 2.5 nV/√Hz input voltage noise + 1.7 pA/√Hz current noise - optimal for high-Z sensor interfaces |
| High-output drive | ±110 mA output current into 100 Ω - eliminates need for external driver stages in video/ADC circuits |
| Video-optimized dG/dP | 0.01% differential gain / 0.03° differential phase - meets broadcast-grade composite video line driver requirements |
| Wide supply flexibility | Operates from single 5 V up to 12 V or dual ±2.5 V to ±6 V - supports both portable and industrial rails |
| Industrial temp range | Specified over –40°C to +85°C - enables deployment in automotive infotainment and industrial data acquisition |
Applications
| ADC Preamplifier | Composite Video Line Driver |
|---|---|
Use Scenario: Signal conditioning before a 14-bit, 10 MSPS SAR ADC (e.g., ADS850) with 2-VPP input range. IC Role / Device Role / Timing Role: High-fidelity gain stage providing low-noise amplification, fast settling, and precise DC offset control. Use Value: 2.5 nV/√Hz noise and ±750 µV VOS preserve effective resolution; 85 MHz large-signal BW supports full 10 MSPS throughput without aliasing. |
Use Scenario: Driving 75-Ω coaxial cable in consumer set-top boxes or security DVRs using NTSC/PAL signals. IC Role / Device Role / Timing Role: Final-stage video buffer with minimal group delay variation across baseband spectrum. Use Value: 0.01%/0.03° dG/dP ensures color fidelity; ±110 mA drive sustains 1-VPP into 75 Ω with <1% distortion at 4.43 MHz. |
| Active Filter (2nd-order Butterworth) | Optical Channel Amplifier |
Use Scenario: Low-pass filtering at 5 MHz in medical ultrasound receive paths requiring linear phase response. IC Role / Device Role / Timing Role: Unity-gain stable gain block implementing Sallen-Key topology with precise pole placement. Use Value: 800-MHz GBW ensures filter Q and cutoff accuracy remain unaffected by op-amp limitations; low distortion avoids harmonic artifacts. |
Use Scenario: Transimpedance amplification of photodiode current in fiber-optic receiver modules. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth current-to-voltage converter with wide dynamic range. Use Value: 2.5 nV/√Hz input noise minimizes total input-referred noise; 240 V/µs slew rate supports >100 Mbps optical data rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-feedback operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA690ID | Higher slew rate (1800 V/µs), wider bandwidth (500 MHz G=2), but higher noise (4.6 nV/√Hz) and supply current (12.5 mA) | Better for ultrafast pulse amplification; less suitable for low-noise, low-power ADC front ends | Select OPA690ID only when >500-MHz bandwidth and >1000-V/µs slew are mandatory; OPA820IDR preferred for noise-sensitive, power-constrained designs |
| OPA2822IDR | Dual-channel, lower bandwidth (200 MHz G=2), lower noise (2.1 nV/√Hz), same SOIC-8 package, but higher quiescent current (7.5 mA per channel) | Enables dual-path signal conditioning (e.g., I/Q channels); not drop-in compatible due to different pinout and dual configuration | Choose OPA2822IDR for space-constrained dual-amplifier needs; OPA820IDR remains optimal for single-channel, high-output-current applications |
Compared with OPA690ID and OPA2822IDR, the OPA820IDR uniquely balances 240-MHz bandwidth, 2.5-nV/√Hz noise, ±110-mA drive, and 5.6-mA quiescent current in a standard SOIC-8 footprint - making it the most versatile choice for precision high-speed analog front ends where power, noise, and drive capability must coexist.
Availability
OPA820IDR is available at Aetrix Electronics and suitable for ADC preamplifiers, composite video line drivers, and active filter designs requiring stable component supply, consistent parametric performance, and long-term industrial temperature support.
Supply support for OPA820IDR 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-chain solutions.
The OPA820IDR belongs to TI's high-speed precision op-amp product line, engineered specifically for applications demanding simultaneous wide bandwidth, low noise, high output drive, and robust DC accuracy - such as data acquisition, video infrastructure, and optical sensing.
FAQ
What supply voltages does the OPA820IDR support?
The OPA820IDR operates from single 5 V to 12 V supplies or dual ±2.5 V to ±6 V supplies. At ±5 V, it delivers 240 MHz small-signal bandwidth and ±3.5 V output swing into no load; at 5 V single supply, it provides 1.2 V to 3.9 V output range with 230 MHz bandwidth - enabling flexible integration across portable and industrial systems without level-shifting circuitry.
Is the OPA820IDR unity-gain stable?
Yes, the OPA820IDR is internally compensated for unity-gain stability. It achieves >800 MHz bandwidth at G = 1 with less than 1-dB peaking, verified across –40°C to +85°C. This eliminates the need for external compensation networks in buffer, transimpedance, or gain-of-one configurations - reducing BOM count and layout complexity.
What is the input voltage noise specification for the OPA820IDR?
The OPA820IDR has a typical input voltage noise of 2.5 nV/√Hz at frequencies above 100 kHz, with a maximum of 2.9 nV/√Hz over –40°C to +85°C. This low noise floor, combined with 1.7 pA/√Hz input current noise, makes it especially suitable for high-impedance sensor interfaces, CCD imaging channels, and precision ADC front ends where signal integrity is critical.
Can the OPA820IDR drive 75-Ω video loads?
Yes, the OPA820IDR delivers ±110 mA output current and achieves 0.01% differential gain and 0.03° differential phase at 1.4 VPP into 150 Ω - exceeding broadcast video line driver requirements. When configured as a gain-of-two inverter with proper termination, it reliably drives 75-Ω coaxial cables in NTSC/PAL systems without external emitter followers or transformers.
Does the OPA820IDR have disable functionality?
No, the OPA820IDR does not include an enable/disable pin. All eight pins in its SOIC-8 package are either power, input, output, or no-connect (Pins 1, 5, and 8). Power-down must be implemented externally via supply sequencing or series FET switching - a design choice reflecting its optimization for continuous high-performance operation rather than intermittent duty cycling.
OPA820IDR 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:
- 240V/µs
- Gain Bandwidth Product:
- 280 MHz
- -3db Bandwidth:
- 800 MHz
- Current - Input Bias:
- 9 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 5.6mA
- Current - Output / Channel:
- 110 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
OPA820IDR FAQ
1.How can I place an order for OPA820IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA820IDR 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 OPA820IDR reliable?
The price and inventory of OPA820IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA820IDR is usually 5 days.
3.What payment methods are accepted for OPA820IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA820IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA820IDR?
OPA820IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA820IDR 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 OPA820IDR?
For technical support, including OPA820IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA820IDR requirements.
6.How does Aetrix verify that OPA820IDR is sourced from the original manufacturer or authorized distributors?
All OPA820IDR 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 OPA820IDR meets industry standards.
7.What is the process for return or replacement of OPA820IDR?
All OPA820IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA820IDR, 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 OPA820IDR part is unused and in its original packaging.
Return procedure for OPA820IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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