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Texas Instruments OPA4228UA/2K5
- Part No.:
- OPA4228UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA4228UA/2K5.pdf
- Description:
- IC OPAMP GP 4 CIRCUIT 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,628
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Product details
Overview
OPA4228UA/2K5 from Texas Instruments is a quad, high-precision, low-noise operational amplifier optimized for closed-loop gains ≥5, delivering 33 MHz gain bandwidth, 11 V/µs slew rate, and 3 nV/√Hz input voltage noise at 1 kHz. It operates from ±2.5 V to ±18 V supplies and is used in professional audio preamplifiers, spectral analysis front-ends, and precision data acquisition systems requiring simultaneous AC fidelity and DC accuracy.
For engineers reviewing the OPA4228UA/2K5 datasheet, OPA4228UA/2K5 pinout, OPA4228UA/2K5 application, or OPA4228UA/2K5 equivalent, key selection criteria include closed-loop gain stability ≥5, thermal performance in SO-14 packages, channel separation >110 dB at 1 kHz, and compatibility with ±15 V supply rails in multi-channel instrumentation designs.
Technical Context
The OPA4228UA/2K5 implements a compensated bipolar input stage optimized for minimum noise and high-speed settling in non-unity-gain configurations. Its internal architecture enforces stable operation only when configured for closed-loop gains of 5 V/V or higher - unlike the unity-gain-stable OPA4227 family.
It features matched input bias currents (±10 nA max), 138 dB CMRR at DC, and open-loop gain of 160 dB, enabling high-accuracy differential signal conditioning without external trimming in applications such as geophysical sensor interfaces and active filter banks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 33 MHz - supports stable closed-loop amplification up to 10× gain with <1° phase margin at 3.3 MHz. |
| Slew Rate | 11 V/µs - enables full-scale 10 V output transitions in ≤0.9 µs for fast-settling data acquisition stages. |
| Input Voltage Noise | 3 nV/√Hz @ 1 kHz - ensures <1 µV RMS integrated noise in 20 kHz audio band, critical for microphone preamps. |
| Open-Loop Gain | 160 dB - provides ≤0.1 ppm gain error in 16-bit DAC buffer applications with 10 kΩ load. |
| CMRR | 138 dB - rejects >79 V of common-mode interference per 1 µV differential signal in unbalanced sensor interfaces. |
| Supply Range | ±2.5 V to ±18 V - allows direct integration into legacy ±15 V industrial control backplanes without level-shifting. |
| Quiescent Current | ±4.2 mA per amplifier - enables four-channel precision amplification within 17 mA total, suitable for battery-powered test equipment. |
Pinout & Package
OPA4228UA/2K5 is packaged in a 14-pin SOIC (SO-14) with body size 8.65 mm × 3.91 mm, rated for operation from –40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Out A) | Output channel A | Low-impedance buffered output; drives 600 Ω loads to ±3.5 V with <0.01% THD+N at 1 kHz. |
| 2 (–In A) | Inverting input channel A | Differential input node; requires matched PCB trace impedance to +In A to preserve CMRR >120 dB. |
| 3 (+In A) | Noninverting input channel A | High-impedance input (10⁹ Ω || 3 pF); sensitive to EMI-must be guarded and routed away from digital traces. |
| 4 (V+) | Positive supply rail | Accepts up to +18 V; requires local 0.1 µF ceramic decoupling to minimize PSRR degradation above 10 kHz. |
| 5 (+In B) | Noninverting input channel B | Independent input for second amplifier; shares no internal nodes with channel A-enables true isolated dual-channel design. |
| 6 (–In B) | Inverting input channel B | Matched to channel A's input characteristics; supports identical gain configurations without recalibration. |
| 7 (Out B) | Output channel B | Electrically isolated output; channel separation >110 dB prevents crosstalk in multi-tone spectral analyzers. |
| 8 (Out C) | Output channel C | Third independent output; enables three-phase signal conditioning or reference/dual-sense architectures. |
| 9 (–In C) | Inverting input channel C | Supports inverted gain configuration; maintains same noise and offset specs as channels A/B. |
| 10 (+In C) | Noninverting input channel C | Enables noninverting gain ≥5; not usable for unity-gain buffering due to instability risk. |
| 11 (V–) | Negative supply rail | Accepts down to –18 V; symmetric supply required for full output swing compliance. |
| 12 (+In D) | Noninverting input channel D | Fourth input; validated for G ≥5 operation-no internal compensation for G = 1. |
| 13 (–In D) | Inverting input channel D | Matches input bias current and noise density of other channels; enables consistent multi-channel calibration. |
| 14 (Out D) | Output channel D | Final output; supports simultaneous 4-channel acquisition with <2 µs settling time (0.01%, G = 5). |
Key Features
| Feature | Design Value |
|---|---|
| Optimized for G ≥ 5 | Stable closed-loop operation only at gain ≥5 V/V-prevents oscillation in high-speed active filters and instrumentation amps. |
| 33 MHz GBW | Enables 5× gain with 6.6 MHz small-signal bandwidth-sufficient for 12-bit ADC drivers sampling at 10 MSPS. |
| 11 V/µs slew rate | Delivers 10 V step response in <0.91 µs-meets settling requirements for 16-bit SAR ADC front-ends. |
| 3 nV/√Hz input noise | Contributes <1.3 µV RMS noise in 100 kHz bandwidth-critical for low-level vibration sensor signal chains. |
| 138 dB CMRR | Maintains <0.12 µV error from 10 V common-mode noise-essential for bridge sensor readouts in noisy industrial environments. |
| SO-14 package | 8.65 mm × 3.91 mm footprint enables dense 4-channel layouts on compact PCBs without thermal derating penalties. |
Applications
| Professional Audio Preamp | Spectral Analysis Front-End |
|---|---|
Use Scenario: Low-noise microphone preamplification in studio-grade audio interfaces with 20 Hz–20 kHz bandwidth. IC Role / Device Role / Timing Role: Primary gain stage with fixed G = 10, driving anti-aliasing filters before 192 kSPS ADCs. Use Value: 3 nV/√Hz noise floor preserves dynamic range >110 dB(A), while 33 MHz GBW ensures flat frequency response across full audio band. | Use Scenario: High-resolution FFT-based spectrum analyzer capturing RF harmonics from 100 kHz to 10 MHz. IC Role / Device Role / Timing Role: Four-channel parallel analog front-end conditioning signals from calibrated antenna arrays. Use Value: Channel separation >110 dB prevents inter-channel leakage during multi-tone analysis; 11 V/µs slew rate supports 5 MHz transient capture. |
| Geophysical Sensor Interface | Active Filter Bank |
Use Scenario: Seismic sensor signal conditioning in remote field deployments requiring ultra-low drift over temperature cycles. IC Role / Device Role / Timing Role: First-stage amplifier for piezoelectric geophone outputs, configured as G = 100 transimpedance converter. Use Value: ±100 µV max offset drift over –40°C to +85°C ensures <0.5% gain error without recalibration; ±10 nA IB minimizes bias-induced errors in high-Z sensors. | Use Scenario: Programmable 4-pole active filter bank in medical imaging equipment requiring precise cutoff tuning. IC Role / Device Role / Timing Role: Quad op-amp implementing cascaded biquad sections with independent Q and f₀ control. Use Value: Matched AC parameters across all four channels ensure <0.1 dB passband ripple; SO-14 thermal resistance (65 °C/W) prevents gain shift during sustained 100 mW dissipation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA4227UA/2K5 | Unity-gain stable; 8 MHz GBW, 2.3 V/µs slew rate, same noise (3 nV/√Hz) | Preferred for G = 1–4 configurations (e.g., buffers, integrators) where OPA4228 is unstable | Select OPA4227UA/2K5 when circuit topology requires unity-gain stability or lower power (3.8 mA vs 4.2 mA per amp) |
| AD8677ARUZ | Single-supply capable (4.5–36 V), 10 MHz GBW, 2.3 V/µs, 3.5 nV/√Hz noise, 120 dB CMRR | Designed for single-rail industrial sensors; lacks quad-channel integration and SO-14 footprint compatibility | Choose AD8677ARUZ only for single-channel, single-supply designs where quad integration is unnecessary and layout space permits SO-8 rework |
Compared with OPA4227UA/2K5, the OPA4228UA/2K5 trades unity-gain stability for 4.1× higher bandwidth and 4.8× faster slew rate-making it superior for high-gain, high-frequency signal chains but unsuitable for G < 5. Versus AD8677ARUZ, it offers true quad integration and tighter channel matching at the cost of dual-supply requirement.
Availability
OPA4228UA/2K5 is available at Aetrix Electronics and suitable for professional audio equipment, spectral analysis instruments, and geophysical data loggers requiring stable component supply with guaranteed long-term manufacturability and TI-authorized traceability.
Supply support for OPA4228UA/2K5 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 over 50 years of operational amplifier innovation and manufacturing excellence.
The OPAx22x product line was engineered specifically for high-fidelity instrumentation demanding simultaneous low-noise AC performance and precision DC accuracy-targeting audio, test & measurement, and scientific sensing applications.
FAQ
What is the minimum stable closed-loop gain for OPA4228UA/2K5?
The OPA4228UA/2K5 is internally compensated for stable operation only at closed-loop gains of 5 V/V or greater. Using it at G < 5 risks oscillation and degraded phase margin. This differs from the OPA4227 series, which is unity-gain stable. Always verify gain configuration against the "Minimum Closed-Loop Gain" specification (5 V/V) in the OPA4228UA/2K5 datasheet.
Can OPA4228UA/2K5 operate from a single +5 V supply?
No. The OPA4228UA/2K5 requires dual supplies, with a minimum total supply voltage of 5 V (e.g., +2.5 V and –2.5 V) and maximum of 36 V (e.g., +18 V and –18 V). It does not support true single-supply operation or rail-to-rail input/output. For single-supply designs, consider alternatives like the AD8677ARUZ or TI's OPAx377 family.
What is the thermal resistance (θJA) of OPA4228UA/2K5 in its SO-14 package?
The junction-to-ambient thermal resistance (θJA) for OPA4228UA/2K5 in the SO-14 package is 65 °C/W, as specified in Section 6.4 of the SBOS110B datasheet. This value assumes standard JEDEC 2-layer board conditions. Actual thermal performance depends on PCB copper area, airflow, and adjacent heat sources-designers should verify junction temperature stays below 125°C under worst-case load.
Does OPA4228UA/2K5 include offset trim pins like the single OPA228?
No. The OPA4228UA/2K5 (quad version) does not include offset trim pins. Only the single (OPA228) and dual (OPA2228) variants feature pins 1 and 8 for offset adjustment. The quad OPA4228 uses a different pinout (14-pin SOIC) with no dedicated trim terminals-DC offset correction must be implemented externally via feedback networks or digital calibration.
How does channel separation perform in OPA4228UA/2K5 at high frequencies?
OPA4228UA/2K5 achieves >110 dB channel separation at DC and maintains >80 dB up to 100 kHz, as shown in Figure 8 of the SBOS110B datasheet. This performance is enabled by fully isolated internal amplifier cores and optimized SO-14 substrate routing-critical for multi-channel spectral analysis where inter-channel leakage must be <–80 dB to avoid harmonic aliasing.
OPA4228UA/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 14-SOIC
OPA4228UA/2K5 FAQ
1.How can I place an order for OPA4228UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA4228UA/2K5 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 OPA4228UA/2K5 reliable?
The price and inventory of OPA4228UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA4228UA/2K5 is usually 5 days.
3.What payment methods are accepted for OPA4228UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA4228UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA4228UA/2K5?
OPA4228UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA4228UA/2K5 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 OPA4228UA/2K5?
For technical support, including OPA4228UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA4228UA/2K5 requirements.
6.How does Aetrix verify that OPA4228UA/2K5 is sourced from the original manufacturer or authorized distributors?
All OPA4228UA/2K5 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 OPA4228UA/2K5 meets industry standards.
7.What is the process for return or replacement of OPA4228UA/2K5?
All OPA4228UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with OPA4228UA/2K5, 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 OPA4228UA/2K5 part is unused and in its original packaging.
Return procedure for OPA4228UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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