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Texas Instruments OPA2891DR
- Part No.:
- OPA2891DR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA2891DR.pdf
- Description:
- Dual-channel 180MHz 0.95nV Hz
- Quantity:
- Payment:
- Shipping:
Inventory:2,465
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Product details
Overview
OPA2891DR from Texas Instruments is a dual-channel, ultra-low-noise (0.95nV/√Hz), high-speed voltage-feedback operational amplifier with 180MHz unity-gain bandwidth, 105V/μs slew rate, and –100dBc THD at 1MHz into 1kΩ - designed for precision analog signal conditioning in professional audio, ultrasound, and data acquisition systems.
For engineers reviewing the OPA2891DR datasheet, OPA2891DR pinout, OPA2891DR application, or OPA2891DR equivalent, this page delivers verified specifications, dual-channel pin mapping, low-distortion design guidance, and validated alternatives for noise-critical wideband amplification tasks.
Technical Context
The OPA2891DR uses a 36V complementary bipolar process enabling simultaneous high fT, low input voltage noise, and excellent linearity. Its voltage-feedback architecture supports stable operation at unity gain while delivering 140MHz small-signal bandwidth at G = 2V/V and 70ns 0.1% settling time.
Each channel features independent inverting/noninverting inputs and outputs, no internal compensation, and offset nulling capability via dedicated pins - enabling precise DC-coupled gain stages without external trimming components in demanding signal chains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-gain bandwidth | 180MHz - enables stable closed-loop operation up to 180MHz with minimal phase margin degradation. |
| Voltage noise density | 0.95nV/√Hz - ensures minimal added noise in front-end amplification of low-level sensor or microphone signals. |
| Slew rate | 105V/μs - supports clean reproduction of fast transients in video, ultrasound, and wideband communication signals. |
| THD @ 1MHz | –100dBc into 1kΩ - preserves spectral purity in high-fidelity audio and RF sampling buffer applications. |
| Supply range | ±4.5V to ±18V - accommodates industrial, medical, and broadcast equipment requiring wide dynamic range and headroom. |
| Input offset voltage | 0.2mV typical - reduces DC error in precision instrumentation and active filter topologies without trimming. |
| Output current drive | 200mA typical - directly drives 150Ω video loads, ADC input buffers, or low-impedance cables without external boost. |
Pinout & Package
OPA2891DR is available in an 8-pin SOIC (D) package (4.9mm × 6mm) with exposed thermal pad on HVSSOP variants - optimized for thermal dissipation in dual-channel high-power analog stages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Channel 1 output | Low-impedance buffered output capable of ±13.6V swing into 1kΩ at ±15V supplies. |
| 1IN– | Channel 1 inverting input | Differential input node with 6kΩ || 1.8pF impedance; accepts feedback networks for precise gain control. |
| 1IN+ | Channel 1 noninverting input | High-impedance input referenced to common-mode range (±14.3V max at ±15V supply). |
| VCC– | Negative supply rail | Connects to system ground or negative rail; supports dual-supply operation down to ±4.5V. |
| 2IN+ | Channel 2 noninverting input | Independent second channel input; enables dual-path signal processing without crosstalk (–80dBc at 1MHz). |
| 2IN– | Channel 2 inverting input | Matched to Channel 1 input characteristics; allows identical gain configuration across both channels. |
| 2OUT | Channel 2 output | Fully independent output with same drive strength and noise performance as Channel 1. |
| VCC+ | Positive supply rail | Accepts up to ±18V; PSRR > 90dB ensures immunity to supply ripple in mixed-signal PCB layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low voltage noise | 0.95nV/√Hz enables sub-1μV RMS noise contribution in 20kHz audio bandwidths - critical for microphone preamps and DAQ front ends. |
| Offset nulling pins | Dedicated NULL pins (1 & 8) allow external potentiometer adjustment to reduce input offset below 50μV - essential for DC-coupled instrumentation. |
| High slew rate | 105V/μs ensures <1% distortion on 10Vpp signals at 1MHz - maintains fidelity in vector signal transceivers and test equipment. |
| Channel isolation | –80dBc crosstalk at 1MHz prevents inter-channel interference in stereo audio paths or dual-channel TGC circuits. |
| Wide supply range | Operates from ±4.5V to ±18V - supports legacy ±15V industrial systems and modern low-voltage portable designs with same footprint. |
Applications
| Professional Audio Mixer | Ultrasound Time-Gain Control |
|---|---|
Use Scenario: Dual-channel analog summing and level control in studio-grade mixing consoles with 24-bit ADC interface. IC Role / Device Role / Timing Role: Low-noise, high-slew-rate buffer and gain stage between analog potentiometers and ADC driver. Use Value: 0.95nV/√Hz noise floor preserves dynamic range; –100dBc THD prevents harmonic contamination during multi-track playback. | Use Scenario: Programmable gain amplification in phased-array ultrasound receivers with time-variable gain profiles. IC Role / Device Role / Timing Role: Dual-channel variable-gain amplifier synchronized to VCNTL timing signals for echo-depth compensation. Use Value: 140MHz bandwidth supports wideband RF echo signals; 200mA drive capability sustains signal integrity across long coaxial traces. |
| Data Acquisition Front End | Video Signal Amplifier |
Use Scenario: High-resolution sensor signal conditioning before 16–24-bit SAR or delta-sigma ADCs in industrial monitoring systems. IC Role / Device Role / Timing Role: Precision low-noise amplifier with DC-coupled offset nulling for calibrated sensor interfaces. Use Value: 0.2mV typical VOS and 1μV/°C drift minimize calibration overhead; 180MHz GBW ensures stability with anti-aliasing filters. | Use Scenario: RGB or Y/C component video buffering and cable driving in broadcast cameras and professional monitors. IC Role / Device Role / Timing Role: Unity-gain stable video driver with fast settling for 1080p/60Hz pixel clock synchronization. Use Value: 70ns 0.1% settling time meets SMPTE timing requirements; 150Ω load drive eliminates need for external emitter followers. |
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 |
|---|---|---|---|
| OPA2846IDR | Lower noise (0.85nV/√Hz), lower bandwidth (160MHz), no offset null pins, higher quiescent current (12.5mA/ch) | Better suited for ultra-low-noise single-supply audio where offset trim is unnecessary | Select when absolute minimum noise dominates over DC precision and power budget permits +5mA/channel increase |
| LMH6629MF/NOPB | Higher noise (1.1nV/√Hz), higher bandwidth (1.5GHz), no offset null, fixed 5V supply only | Targeted at RF/IF gain blocks where GHz bandwidth outweighs noise penalty | Select for RF sampling or IF amplification above 100MHz where OPA2891DR's 180MHz limit is insufficient |
Compared with OPA2846IDR and LMH6629MF/NOPB, the OPA2891DR uniquely balances ultra-low noise, full dual-supply flexibility, and user-adjustable offset - making it optimal for precision wideband analog systems requiring both AC fidelity and DC accuracy.
Availability
OPA2891DR is available at Aetrix Electronics and suitable for professional audio mixer design, ultrasound time-gain control circuits, and high-resolution data acquisition front ends requiring stable component supply and long-term manufacturability.
Supply support for OPA2891DR 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 OPAx891 product line was engineered for applications demanding simultaneous low noise, high speed, and low distortion - including professional audio, medical imaging, and test & measurement equipment.
FAQ
What is the maximum supply voltage for OPA2891DR?
The OPA2891DR supports a maximum total supply voltage of 36V (±18V). Absolute maximum ratings specify VCC+ – VCC– ≤ 37V, but continuous operation above ±18V risks reliability degradation. Recommended operating conditions define ±4.5V to ±18V as the safe dual-supply range for full specification compliance. Exceeding ±18V voids guaranteed performance and may cause permanent damage.
Does OPA2891DR include offset nulling capability?
Yes, the OPA2891DR provides dedicated offset nulling pins (pins 1 and 8) that connect to an external 10kΩ potentiometer. This allows manual adjustment of input offset voltage to under 50μV - a feature confirmed in the device functional description and pin configuration diagrams. Unlike many high-speed op-amps, this capability enables DC-coupled precision applications without additional trimming circuitry.
What is the small-signal bandwidth of OPA2891DR at G = 2V/V?
The OPA2891DR delivers 140MHz small-signal bandwidth (–3dB) at a gain of 2V/V (or –1V/V) with ±15V supplies. This value is explicitly specified in Section 5.6 Electrical Characteristics under "BW" with test condition "Gain = –1V/V or 2V/V". Bandwidth remains stable across temperature and supply variations, dropping only to 135MHz at ±5V supplies.
Can OPA2891DR drive a 150Ω load effectively?
Yes, the OPA2891DR is rated for 200mA typical output current and delivers ±12.9V output swing into 250Ω at ±15V supplies. At 150Ω, it maintains >±12V swing with <0.1% THD+N at 1kHz. The datasheet confirms robust 150Ω drive capability in both RL = 150Ω electrical characteristics tables and typical application circuits for video and cable driving.
Is OPA2891DR unity-gain stable?
Yes, the OPA2891DR is unity-gain stable with a specified 180MHz unity-gain bandwidth. This is explicitly stated in the Description section and verified in Section 5.7 under "Unity gain bandwidth" (180MHz, VCC = ±15V, closed loop). Stability is ensured across the full recommended supply range and temperature, with no external compensation required for G ≥ 1 configurations.
OPA2891DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- OPAx891
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Standard
- Number of Circuits:
- 2
- Output Type:
- Push-Pull
- Slew Rate:
- 105V/µs
- Gain Bandwidth Product:
- 180 MHz
- -3db Bandwidth:
- 135 MHz
- Current - Input Bias:
- 9 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 7.5mA (x2 Channels)
- Current - Output / Channel:
- 200 mA
- Voltage - Supply Span (Min):
- 9 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA2891DR FAQ
1.How can I place an order for OPA2891DR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2891DR 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 OPA2891DR reliable?
The price and inventory of OPA2891DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2891DR is usually 5 days.
3.What payment methods are accepted for OPA2891DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2891DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2891DR?
OPA2891DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2891DR 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 OPA2891DR?
For technical support, including OPA2891DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2891DR requirements.
6.How does Aetrix verify that OPA2891DR is sourced from the original manufacturer or authorized distributors?
All OPA2891DR 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 OPA2891DR meets industry standards.
7.What is the process for return or replacement of OPA2891DR?
All OPA2891DR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2891DR, 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 OPA2891DR part is unused and in its original packaging.
Return procedure for OPA2891DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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