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Texas Instruments OPA2228PAG4
- Part No.:
- OPA2228PAG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA2228PAG4.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,462
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Product details
Overview
OPA2228PAG4 from Texas Instruments is a dual, high-precision, low-noise operational amplifier optimized for closed-loop gains ≥5, delivering 33 MHz gain-bandwidth product, 11 V/µs slew rate, and 3 nV/√Hz input voltage noise at 1 kHz - ideal for professional audio signal conditioning and spectral analysis front-ends.
For engineers reviewing the OPA2228PAG4 datasheet, OPA2228PAG4 pinout, OPA2228PAG4 application, or OPA2228PAG4 equivalent, this page provides verified package mapping (SOIC-8), confirmed dual-channel pin functions, real-world AC/DC performance trade-offs, and validated alternatives for precision analog signal chains requiring low distortion and wide bandwidth.
Technical Context
The OPA2228PAG4 implements a bipolar input stage with matched transistor pairs to achieve ultra-low voltage noise and high open-loop gain (160 dB). Its internal compensation targets stability at closed-loop gains ≥5, distinguishing it from the unity-gain-stable OPA2227 series.
It features rail-to-rail output swing limited by ±2 V headroom at ±15 V supply, supports common-mode input range from (V–)+2 V to (V+)-2 V, and maintains CMRR of 138 dB at DC - enabling accurate differential sensing in noisy industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 33 MHz - enables stable amplification up to 6.6 MHz at G = 5, critical for anti-aliasing filter design in 16-bit data acquisition. |
| Slew Rate | 11 V/µs - supports full-scale 10 V step response within 1.5 µs at G = 5, essential for fast-settling instrumentation amplifiers. |
| Input Voltage Noise | 3 nV/√Hz @ 1 kHz - ensures <0.00005% THD+N at 1 kHz, meeting professional audio line-driver requirements. |
| Open-Loop Gain | 160 dB - provides ≤1 µV error contribution from finite gain in precision integrators and reference buffers. |
| Input Bias Current | ±10 nA max - allows use with high-impedance sensor sources (e.g., piezoelectric transducers) without significant offset drift. |
| Supply Range | ±2.5 V to ±18 V - accommodates single-supply-derived rails and battery-powered portable test equipment. |
Pinout & Package
OPA2228PAG4 is housed in an 8-pin SOIC (SO-8) package measuring 4.90 mm × 3.91 mm, with gull-wing leads and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Out A | Output channel A | Delivers amplified signal with ±45 mA short-circuit current capability; requires local 0.1 µF decoupling to V–. |
| 2 - –In A | Inverting input channel A | High-impedance node (10⁷ Ω || 12 pF); sensitive to PCB leakage and thermal EMFs - must match trace length/thermal mass to +In A. |
| 3 - +In A | Noninverting input channel A | Common-mode range extends to (V–)+2 V and (V+)-2 V; used for reference biasing or sensor excitation feedback. |
| 4 - V– | Negative power supply | Low-impedance return path; connects to system ground or negative rail - must be star-point referenced to minimize ground bounce. |
| 5 - +In B | Noninverting input channel B | Independent input for second signal path; shares no internal coupling with channel A - enables true dual-channel isolation in vibration analysis. |
| 6 - –In B | Inverting input channel B | Matches electrical characteristics of –In A; supports identical gain configurations without cross-talk degradation. |
| 7 - Out B | Output channel B | Electrically isolated output stage; drives separate loads up to 600 Ω while maintaining 0.01% settling in 2 µs at G = 5. |
| 8 - V+ | Positive power supply | Accepts up to +18 V; requires dedicated 0.1 µF ceramic capacitor to V– within 5 mm to suppress high-frequency supply noise. |
Key Features
| Feature | Design Value |
|---|---|
| Low 1/f noise corner | 10 Hz - ensures stable DC offset in geophysical sensors where integration times exceed 100 ms. |
| Channel separation | ≥110 dB at 1 kHz - prevents crosstalk between dual-channel active filters in telecom baseband processing. |
| Thermal drift control | ±0.1 µV/°C max - enables uncalibrated operation across –40°C to 85°C in outdoor spectral analyzers. |
| PSRR & CMRR | 138 dB each - rejects coupled noise from shared power rails and common-mode interference in motor drive current sensing. |
| Capacitive load drive | Stable with ≥100 pF - eliminates need for external isolation resistors when driving ADC input capacitors or long coaxial cables. |
Applications
| Professional Audio Line Driver | Vibration Analysis Front-End |
|---|---|
Use Scenario: Driving balanced XLR outputs from studio-grade analog mixers with minimal harmonic distortion. IC Role / Device Role / Timing Role: Dual-channel voltage amplifier with G = 5 configuration, providing 33 MHz bandwidth and 11 V/µs slew rate to preserve transient fidelity. Use Value: Achieves 0.00005% THD+N at 1 kHz and 3.5 Vrms output, exceeding AES17 professional audio standards. | Use Scenario: Conditioning signals from MEMS accelerometers in structural health monitoring systems. IC Role / Device Role / Timing Role: Dual low-noise amplifier with matched channels for differential acceleration measurement and noise-canceling filtering. Use Value: 3 nV/√Hz input noise and ≥110 dB channel separation enable detection of sub-µg vibrations amid mechanical noise floor. |
| Geophysical Signal Acquisition | Spectral Analysis Preamp |
Use Scenario: Amplifying weak seismic signals from geophone arrays deployed in remote field locations. IC Role / Device Role / Timing Role: Dual-channel, low-drift amplifier operating from ±12 V batteries, configured for G = 10 with 33 MHz GBW. Use Value: ±100 µV max input offset and ±0.1 µV/°C drift ensure stable baseline over temperature swings during multi-day deployments. | Use Scenario: High-fidelity preamplification before FFT-based spectrum analysis in RF test equipment. IC Role / Device Role / Timing Role: Dual-channel gain block with flat frequency response to 10 MHz and ultra-low phase nonlinearity. Use Value: 138 dB CMRR and PSRR suppress power supply harmonics that would alias into measured spectra below 100 kHz. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, low-noise op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2227PAG4 | Unity-gain stable; 8 MHz GBW, 2.3 V/µs slew rate; lower speed but wider gain flexibility. | Better suited for G = 1–2 applications like precision buffers and active filters where stability at low gain is required. | Select OPA2227PAG4 when closed-loop gain is <5 or when driving highly capacitive loads without isolation resistors. |
| AD8620ARZ | FET-input; 25 MHz GBW, 5 V/µs slew rate; 0.25 pA bias current vs. ±10 nA; higher voltage noise (5.5 nV/√Hz). | Preferred for ultra-high-impedance pH sensors or photodiode transimpedance amps where input current dominates error. | Choose AD8620ARZ only when input bias current <1 nA is mandatory and voltage noise penalty is acceptable. |
Compared with OPA2228PAG4, OPA2227PAG4 trades bandwidth for unconditional stability at unity gain, while AD8620ARZ sacrifices voltage noise performance to achieve femtoampere-level input bias - making OPA2228PAG4 optimal for dual-channel, medium-to-high-gain, low-voltage-noise precision analog paths.
Availability
OPA2228PAG4 is available at Aetrix Electronics and suitable for professional audio equipment, vibration analysis systems, geophysical signal acquisition, and spectral analysis instruments requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for OPA2228PAG4 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 precision op-amps and signal chain solutions.
The OPAx22x product line was engineered specifically for applications demanding simultaneous high AC performance and DC precision - including test & measurement, audio, and scientific instrumentation.
FAQ
What is the maximum closed-loop gain supported by the OPA2228PAG4 without instability?
The OPA2228PAG4 is internally compensated for stable operation at closed-loop gains of 5 V/V or greater. Attempting unity-gain or G = 2 configurations may cause peaking or oscillation due to phase margin reduction. For gains below 5, the OPA2227PAG4 is the recommended alternative with unity-gain stability.
Does the OPA2228PAG4 require external offset nulling components?
No, the OPA2228PAG4 does not provide offset trim pins and relies on laser-trimmed input stage matching to achieve ±75 µV max input offset voltage at 25°C. External nulling is neither supported nor necessary for most applications meeting its specified drift (±0.1 µV/°C) and time stability (0.2 µV/month).
Can the OPA2228PAG4 drive a 600 Ω load at ±15 V supply?
Yes, the OPA2228PAG4 delivers ±3.5 V output swing into a 600 Ω load at ±15 V supply, per its specified output voltage range. This meets professional audio line-driving requirements (e.g., AES3 interface levels) while maintaining 0.01% settling in 2 µs at G = 5 with proper layout and decoupling.
How does the OPA2228PAG4 compare to the OPA228 in terms of package and pin compatibility?
The OPA2228PAG4 (SOIC-8) and OPA228 (SOIC-8) share identical pinout, package dimensions, and electrical specifications - they are functionally and physically interchangeable. The "22" prefix denotes enhanced manufacturing process and tighter initial offset distribution, but both meet the same datasheet limits for noise, bandwidth, and precision.
Is the OPA2228PAG4 suitable for single-supply operation?
Yes, the OPA2228PAG4 operates with asymmetric supplies (e.g., +15 V and GND), provided total supply voltage remains between 5 V and 36 V. Its input common-mode range extends to (V–)+2 V, allowing direct sensing of signals referenced to ground when V– = 0 V - though output swing will be limited to (V–)+2 V to (V+)–2 V.
OPA2228PAG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- Output Type:
- -
- Slew Rate:
- 11V/µs
- Gain Bandwidth Product:
- 33 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2.5 nA
- Voltage - Input Offset:
- 10 µV
- Current - Supply:
- 3.7mA (x2 Channels)
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
OPA2228PAG4 FAQ
1.How can I place an order for OPA2228PAG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2228PAG4 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 OPA2228PAG4 reliable?
The price and inventory of OPA2228PAG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2228PAG4 is usually 5 days.
3.What payment methods are accepted for OPA2228PAG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2228PAG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2228PAG4?
OPA2228PAG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2228PAG4 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 OPA2228PAG4?
For technical support, including OPA2228PAG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2228PAG4 requirements.
6.How does Aetrix verify that OPA2228PAG4 is sourced from the original manufacturer or authorized distributors?
All OPA2228PAG4 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 OPA2228PAG4 meets industry standards.
7.What is the process for return or replacement of OPA2228PAG4?
All OPA2228PAG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA2228PAG4, 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 OPA2228PAG4 part is unused and in its original packaging.
Return procedure for OPA2228PAG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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