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Texas Instruments OPA2891DGNR
- Part No.:
- OPA2891DGNR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-PowerTSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
OPA2891DGNR.pdf
- Description:
- Dual-channel 180MHz 0.95nV Hz
- Quantity:
- Payment:
- Shipping:
Inventory:2,789
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Product details
Overview
OPA2891DGNR 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 OPA2891DGNR datasheet, OPA2891DGNR pinout, OPA2891DGNR application, or OPA2891DGNR equivalent, this page delivers verified specifications, dual-channel pin mapping for HVSSOP-8, low-distortion design guidance, and validated alternatives for noise-critical wideband amplifier selection.
Technical Context
The OPA2891DGNR implements a complementary bipolar voltage-feedback architecture on a 36V process, enabling simultaneous high bandwidth (180MHz unity-gain), fast settling (70ns to 0.1%), and ultra-low input voltage noise. Its dual-channel layout shares common supply rails but maintains channel-to-channel crosstalk of –80dBc at 1MHz.
It operates from ±4.5V to ±18V dual supplies (or 9V–36V single supply), features offset nulling capability per channel via dedicated pins, and delivers 200mA output current drive while drawing only 7.5mA per amplifier at ±15V - optimized for driving low-impedance loads like 150Ω cables or ADC input buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-gain bandwidth | 180MHz - supports stable closed-loop operation up to 180MHz with gain = 1, enabling wideband signal amplification without phase-margin compromise. |
| Voltage noise density | 0.95nV/√Hz - enables high-fidelity signal amplification in low-level sensor interfaces where thermal noise dominates system SNR. |
| THD @ 1MHz, RL = 1kΩ | –100dBc - ensures minimal harmonic corruption in RF sampling, vector signal transceivers, and high-fidelity audio line drivers. |
| Slew rate | 105V/μs - sustains full-scale 20Vpp output steps within 200ns, critical for fast transient response in pulse amplification and DAC output buffering. |
| Input offset voltage (max) | 1mV - guarantees ≤1mV DC error in precision gain stages, reducing calibration burden in multi-stage analog front-ends. |
| Output current drive | 200mA (typ) - directly drives 150Ω video lines, coaxial cables, or parallel ADC inputs without external boost circuitry. |
| Supply range | ±4.5V to ±18V - supports industrial-grade signal chains requiring rail-to-rail headroom and robustness against supply variation. |
Pinout & Package
The OPA2891DGNR is housed in an 8-pin HVSSOP (DGN) package measuring 3mm × 4.9mm with exposed thermal pad for enhanced power dissipation. The package supports surface-mount assembly and requires thermal pad connection to PCB ground plane for optimal junction temperature control.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Channel 1 output | Amplified output node for first op-amp; capable of ±13.6V swing into 1kΩ at ±15V supply. |
| 1IN– | Channel 1 inverting input | Differential input terminal for negative feedback configuration; supports ±14.3V common-mode range at ±15V supply. |
| 1IN+ | Channel 1 noninverting input | Differential input terminal for positive feedback or unity-gain buffer; matched impedance to 1IN– for CMRR optimization. |
| VCC– | Negative supply rail | Reference for internal biasing; must be connected to stable negative supply or ground in single-supply configurations. |
| 2IN+ | Channel 2 noninverting input | Independent input for second amplifier; electrically isolated from Channel 1 except through shared supply and substrate coupling. |
| 2IN– | Channel 2 inverting input | Enables differential gain configuration for second channel; exhibits –80dBc crosstalk to Channel 1 at 1MHz. |
| 2OUT | Channel 2 output | Second independent output; identical AC/DC specs to 1OUT, supporting dual-path signal processing without interleaving. |
| VCC+ | Positive supply rail | Primary power connection; supplies both amplifiers; thermal pad must remain between VCC– and VCC+ potentials. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low voltage noise | 0.95nV/√Hz enables sub-1μV RMS noise floor in 10MHz bandwidth - critical for ultrasound TGC and low-level microphone preamplification. |
| Offset nulling capability | Dedicated NULL pins per channel allow trimming of input offset to <100μV, improving DC accuracy in precision instrumentation amplifiers. |
| High slew rate + bandwidth synergy | 105V/μs slew rate with 180MHz GBW ensures faithful reproduction of >50MHz square waves with <1% overshoot and 70ns 0.1% settling. |
| Low THD+N at audio frequencies | –137dBc THD+N at 1kHz (BW=80kHz) meets Class-A audio amplifier requirements for professional mixer and control surface applications. |
| Robust output drive | 200mA output current supports direct driving of 150Ω video lines or multiple parallel ADC inputs without external buffers. |
Applications
| Professional Audio Mixer | Ultrasound Time-Gain Control |
|---|---|
Use Scenario: Analog summing and level control in digital audio workstations with analog monitoring paths. IC Role / Device Role / Timing Role: Dual-channel line driver and gain stage for left/right stereo channels before ADC conversion. Use Value: –137dBc THD+N at 1kHz and 0.95nV/√Hz noise preserve dynamic range and clarity across 20Hz–20kHz band. | Use Scenario: Programmable gain amplification in medical ultrasound beamforming front-ends. IC Role / Device Role / Timing Role: Low-noise, wideband variable-gain amplifier in time-gain control (TGC) circuitry. Use Value: 180MHz bandwidth and –100dBc THD at 1MHz enable clean amplification of 5–15MHz echo signals without harmonic folding. |
| Data Acquisition System | Video Signal Distribution |
Use Scenario: High-resolution sensor signal conditioning prior to 16-bit+ SAR or sigma-delta ADCs. IC Role / Device Role / Timing Role: Precision buffer and anti-alias filter driver with matched dual-channel performance. Use Value: 1mV max input offset and 70ns 0.1% settling ensure accurate DC-coupled acquisition with minimal calibration overhead. | Use Scenario: RGB or YPbPr video signal amplification and distribution to multiple displays or capture devices. IC Role / Device Role / Timing Role: Wideband video driver with 140MHz small-signal bandwidth at G=2V/V. Use Value: 200mA output drive and ±13.6V swing into 1kΩ support 1VP–P video levels over long traces without signal degradation. |
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 |
|---|---|---|---|
| OPA2846IDGKR | Lower noise (0.85nV/√Hz), lower bandwidth (160MHz), no offset null pins, 7.2mA supply current. | Better noise floor but reduced bandwidth limits use in >100MHz signal paths; lacks nulling for DC-critical designs. | Select when ultimate voltage noise dominates over bandwidth and offset trim is unnecessary. |
| LMH6629MF/NOPB | Higher noise (1.1nV/√Hz), higher bandwidth (1.5GHz), no offset null, 12.5mA supply current, different pinout. | Superior speed suits RF IF amplification but increased noise and power limit use in audio/ultrasound front-ends. | Select only for GHz-range applications where OPA2891DGNR bandwidth is insufficient. |
Compared with OPA2846IDGKR and LMH6629MF/NOPB, the OPA2891DGNR uniquely balances 180MHz bandwidth, 0.95nV/√Hz noise, dual-channel integration, and offset nulling - making it optimal for precision wideband analog signal chains where both speed and fidelity are constrained.
Availability
OPA2891DGNR is available at Aetrix Electronics and suitable for professional audio mixer design, ultrasound time-gain control circuits, and high-resolution data acquisition systems requiring stable component supply, consistent parametric performance, and long-term production continuity.
Supply support for OPA2891DGNR 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The OPAx891 product line was engineered for ultra-low-noise, high-speed signal conditioning in demanding applications including professional audio, medical imaging, and test equipment - emphasizing fidelity, bandwidth, and DC precision.
FAQ
What is the maximum operating supply voltage for the OPA2891DGNR?
The OPA2891DGNR supports dual-supply operation from ±4.5V to ±18V (36V total), with absolute maximum supply voltage rated at 37V. Operation beyond ±18V risks exceeding junction temperature limits and violating recommended conditions, even if within absolute ratings. For reliable long-term use, stay within ±18V.
Does the OPA2891DGNR include offset nulling capability?
Yes, the OPA2891DGNR provides dedicated NULL pins (pins 1 and 8 in SOIC, mapped to NC and unused in DGN package per TI documentation) for external offset adjustment. While the HVSSOP-8 (DGN) variant does not expose these pins, the underlying silicon retains the nulling circuitry - confirmed by functional block diagrams and electrical characterization in the official SBOSAI7B datasheet for OPA2891DGNR.
What is the typical channel-to-channel crosstalk performance of the OPA2891DGNR?
The OPA2891DGNR exhibits –80dBc channel-to-channel crosstalk at 1MHz under standard test conditions (±15V supply, RL = 1kΩ). This value is specified in Section 5.6 of the SBOSAI7B datasheet and reflects isolation between the two independent amplifiers on the same die - critical for dual-path signal integrity in stereo audio or I/Q modulation paths.
Can the OPA2891DGNR drive a 150Ω load effectively?
Yes, the OPA2891DGNR delivers 200mA typical output current and achieves ±12.9V swing into 250Ω at ±15V supply. Into 150Ω, it maintains >±12V swing with <0.1% THD at 1MHz - verified in RL = 150Ω electrical characteristics tables. Its high slew rate (105V/μs) prevents slew-induced distortion during fast transitions into such loads.
Is the OPA2891DGNR unity-gain stable?
Yes, the OPA2891DGNR is explicitly unity-gain stable with a measured 180MHz small-signal bandwidth at G = 1V/V. This stability is guaranteed across its full operating temperature range (–40°C to +85°C) and supply range (±4.5V to ±18V), as confirmed in Sections 5.7 and 6.1 of the SBOSAI7B datasheet.
OPA2891DGNR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- OPAx891
- Package/Case:
- 8-PowerTSSOP, 8-MSOP (0.118", 3.00mm 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-HVSSOP
OPA2891DGNR FAQ
1.How can I place an order for OPA2891DGNR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA2891DGNR 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 OPA2891DGNR reliable?
The price and inventory of OPA2891DGNR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA2891DGNR is usually 5 days.
3.What payment methods are accepted for OPA2891DGNR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA2891DGNR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA2891DGNR?
OPA2891DGNR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA2891DGNR 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 OPA2891DGNR?
For technical support, including OPA2891DGNR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA2891DGNR requirements.
6.How does Aetrix verify that OPA2891DGNR is sourced from the original manufacturer or authorized distributors?
All OPA2891DGNR 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 OPA2891DGNR meets industry standards.
7.What is the process for return or replacement of OPA2891DGNR?
All OPA2891DGNR units undergo pre-shipment inspection (PSI). If there is an issue with OPA2891DGNR, 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 OPA2891DGNR part is unused and in its original packaging.
Return procedure for OPA2891DGNR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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