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Texas Instruments OPA4228PA
- Part No.:
- OPA4228PA
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
OPA4228PA.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,207
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Product details
Overview
OPA4228PA from Texas Instruments is a quad, high-precision, low-noise operational amplifier optimized for closed-loop gains ≥5. It delivers 33 MHz gain-bandwidth product, 11 V/µs slew rate, 3 nV/√Hz input voltage noise at 1 kHz, 138 dB CMRR, and ±75 µV max input offset voltage across –40°C to 85°C. It is used in spectral analysis instrumentation requiring simultaneous high-speed signal conditioning and DC accuracy.
For engineers reviewing the OPA4228PA datasheet, OPA4228PA pinout, OPA4228PA application, or OPA4228PA equivalent, key selection criteria include closed-loop gain stability ≥5, thermal performance in PDIP-14 packages, channel separation >110 dB at 1 kHz, and compatibility with ±2.5 V to ±18 V dual supplies.
Technical Context
The OPA4228PA implements a compensated bipolar input stage enabling stable operation at closed-loop gains of 5 or higher-unlike the unity-gain-stable OPA4227. Its internal compensation avoids external components while maintaining phase margin >60° under specified load conditions.
It features laser-trimmed input offset voltage and drift (±0.1 µV/°C typical), differential input impedance of 10⁷ Ω || 12 pF, and common-mode rejection that remains ≥120 dB over –40°C to 85°C. Output drive capability supports ±45 mA short-circuit current and rail-to-rail loading into 600 Ω with ±3.5 V headroom.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 33 MHz - enables stable closed-loop amplification up to 5× gain with bandwidth >6 MHz |
| Slew Rate | 11 V/µs - supports 10 V step settling in ≤1.5 µs at G = 5 with 100 pF load |
| Input Voltage Noise | 3 nV/√Hz @ 1 kHz - preserves SNR in low-level audio and sensor signal chains |
| CMRR | 138 dB - rejects >99.9998% of common-mode interference in precision measurement |
| Input Offset Voltage | ±75 µV max - ensures <0.00075% error in 10 V full-scale DC-coupled systems |
| Supply Range | ±2.5 V to ±18 V - operates from single 5 V up to ±18 V rails without derating |
| Quiescent Current | ±4.2 mA per amplifier - balances speed and power in multi-channel portable instruments |
Pinout & Package
OPA4228PA is supplied in a 14-pin plastic DIP (PDIP-14) package with nominal body size 19.30 mm × 6.35 mm. Thermal resistance is RθJA = 65.5 °C/W (PDIP), suitable for through-hole mounting on standard FR-4 PCBs with moderate copper area.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Out A) | Output channel A | Amplified output for first op amp; capable of ±45 mA short-circuit current |
| 2 (–In A) | Inverting input channel A | Differential input node with 10⁷ Ω || 12 pF impedance; referenced to V– |
| 3 (+In A) | Noninverting input channel A | Differential input node with 10⁹ Ω || 3 pF common-mode impedance |
| 4 (V+) | Positive supply rail | Highest potential supply connection; accepts up to +18 V relative to V– |
| 5 (+In B) | Noninverting input channel B | Independent input for second amplifier; electrically isolated from other channels |
| 6 (–In B) | Inverting input channel B | Second differential pair input; shares no internal nodes with channel A or C |
| 7 (Out B) | Output channel B | Second independent output; channel separation >110 dB at 1 kHz |
| 8 (Out C) | Output channel C | Third output; enables three simultaneous signal paths without inter-channel crosstalk |
| 9 (–In C) | Inverting input channel C | Third differential input; maintains same bias current spec (±10 nA max) as A/B |
| 10 (+In C) | Noninverting input channel C | Third noninverting input; identical DC specs and noise profile to channel A |
| 11 (V–) | Negative supply rail | Lowest potential supply connection; accepts down to –18 V relative to V+ |
| 12 (+In D) | Noninverting input channel D | Fourth input; completes quad configuration with matched gain-bandwidth and noise |
| 13 (–In D) | Inverting input channel D | Fourth differential input; fully isolated with same input voltage range (V– +2 V to V+ –2 V) |
| 14 (Out D) | Output channel D | Fourth output; all four channels share identical AC/DC specifications per datasheet |
Key Features
| Feature | Design Value |
|---|---|
| Closed-loop gain optimization | Stable at G ≥ 5 - eliminates need for external compensation in high-speed filter stages |
| Low 1/f noise | 90 nVp-p (0.1–10 Hz) - critical for DC-coupled geophysical and vibration sensors |
| High channel separation | ≥110 dB at 1 kHz - prevents signal leakage between parallel data acquisition channels |
| Rail-sensing output swing | (V–)+3.5 V to (V+)-3.5 V into 600 Ω - maximizes dynamic range in ±15 V systems |
| Wide temperature specification | –40°C to +85°C operating range - qualified for industrial control and telecom equipment |
Applications
| Professional Audio Equipment | Spectral Analysis |
|---|---|
Use Scenario: Multi-channel microphone preamplification with simultaneous analog peak detection and FFT preprocessing. IC Role / Device Role / Timing Role: Quad OPA4228PA provides four independent, low-noise, high-slew-rate gain stages before ADC sampling. Use Value: 3 nV/√Hz noise floor and 33 MHz GBW enable clean 20 kHz bandwidth capture with >110 dB SNR at 1 Vpp input. | Use Scenario: Real-time frequency-domain analysis of mechanical vibration signals from accelerometers. IC Role / Device Role / Timing Role: Signal conditioning front-end for 4-channel simultaneous sampling in portable spectrum analyzers. Use Value: Matched channel specs and >110 dB channel separation ensure accurate cross-channel coherence measurements. |
| Geophysical Analysis | Telecom Equipment |
Use Scenario: Low-frequency seismic signal amplification in battery-powered field data loggers. IC Role / Device Role / Timing Role: DC-coupled, low-drift gain block for sub-1 Hz earth motion sensing with 24-bit ADC interface. Use Value: ±75 µV max offset and ±0.1 µV/°C drift minimize baseline wander during extended outdoor deployments. | Use Scenario: Line driver and receive-path amplification in DSL line cards with multi-tone testing capability. IC Role / Device Role / Timing Role: High-linearity buffer and active filter stage supporting ADSL2+ upstream/downstream bands. Use Value: 0.00005% THD+N at 1 kHz and 33 MHz GBW support clean multi-carrier signal generation up to 2.2 MHz. |
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 |
|---|---|---|---|
| OPA4227PA | Unity-gain stable; 8 MHz GBW, 2.3 V/µs slew rate; lower speed but broader gain flexibility | Better suited for G = 1–2 instrumentation amplifiers and integrators where stability at low gain is required | Select OPA4227PA when closed-loop gain < 5 or when driving capacitive loads without isolation resistors |
| AD8676ARUZ | Rail-to-rail output; 10 MHz GBW; 2.5 V/µs slew rate; 2.8 nV/√Hz noise; single-supply capable (±2.5 V to ±6 V) | Preferred for low-voltage, space-constrained designs needing rail-to-rail swing and lower quiescent current (1.3 mA/ch) | Select AD8676ARUZ for battery-powered portable test equipment requiring single-supply operation and minimal board area |
Compared with OPA4227PA and AD8676ARUZ, the OPA4228PA uniquely delivers 33 MHz bandwidth and 11 V/µs slew rate in a quad PDIP-14 package while maintaining <75 µV offset and 3 nV/√Hz noise-making it optimal for multi-channel, high-fidelity, medium-to-high-gain signal chains where speed and precision coexist.
Availability
OPA4228PA is available at Aetrix Electronics and suitable for professional audio equipment, spectral analysis instrumentation, geophysical data loggers, and telecom line card designs requiring stable component supply across extended production cycles.
Supply support for OPA4228PA 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 company specializing in analog and embedded processing technologies, with leadership in precision amplifiers, data converters, and power management ICs.
The OPAx22x product line was designed for applications demanding simultaneous high AC performance and DC precision-including test & measurement, audio, and industrial sensing-where low noise, low drift, and wide bandwidth must coexist.
FAQ
What is the minimum closed-loop gain required for stable operation of the OPA4228PA?
The OPA4228PA is internally compensated for stable operation at closed-loop gains of 5 or greater. Attempting to use it at unity gain or G = 2 will result in peaking, overshoot, or oscillation. For lower-gain configurations, the OPA4227PA is the recommended alternative within the same family.
Does the OPA4228PA support single-supply operation?
Yes, the OPA4228PA supports single-supply operation with total supply voltage ranging from 5 V to 36 V. For example, it functions correctly with V+ = +5 V and V– = 0 V, provided input common-mode and output swing constraints (V– +2 V to V+ –2 V) are respected.
What is the thermal resistance (RθJA) of the OPA4228PA in its PDIP-14 package?
The OPA4228PA in PDIP-14 package has a junction-to-ambient thermal resistance (RθJA) of 65.5 °C/W, as specified in the TI datasheet SBOS110B. This value assumes standard JEDEC 2S2P test board conditions and guides heatsinking requirements for continuous 4-channel operation at full quiescent current.
How does the OPA4228PA compare to the OPA228 in terms of noise performance?
The OPA4228PA matches the OPA228's noise performance exactly: 3 nV/√Hz at 1 kHz, 90 nVp-p (0.1–10 Hz), and 0.4 pA/√Hz current noise. As a quad version of the OPA228, it maintains identical per-channel electrical characteristics including offset, drift, CMRR, and THD+N.
Can the OPA4228PA drive a 600 Ω load across its full output voltage range?
Yes-the OPA4228PA delivers ±3.5 V output swing into a 600 Ω load with ±15 V supplies, meeting the full-swing requirement for professional audio line drivers and telecom interface circuits. This is verified in the Electrical Characteristics table under "Voltage Output" with RL = 600 Ω.
OPA4228PA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 4
- 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 (x4 Channels)
- Current - Output / Channel:
- 45 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -55°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-PDIP
OPA4228PA FAQ
1.How can I place an order for OPA4228PA through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4228PA 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 OPA4228PA reliable?
The price and inventory of OPA4228PA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4228PA is usually 5 days.
3.What payment methods are accepted for OPA4228PA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4228PA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4228PA?
OPA4228PA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4228PA 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 OPA4228PA?
For technical support, including OPA4228PA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4228PA requirements.
6.How does Aetrix verify that OPA4228PA is sourced from the original manufacturer or authorized distributors?
All OPA4228PA 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 OPA4228PA meets industry standards.
7.What is the process for return or replacement of OPA4228PA?
All OPA4228PA units undergo pre-shipment inspection (PSI). If there is an issue with OPA4228PA, 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 OPA4228PA part is unused and in its original packaging.
Return procedure for OPA4228PA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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