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Texas Instruments OPA846IDR
- Part No.:
- OPA846IDR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
OPA846IDR.pdf
- Description:
- IC VOLTAGE FEEDBACK 1 CIRC 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,726
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Product details
Overview
OPA846IDR from Texas Instruments is a wideband, low-noise, voltage-feedback operational amplifier optimized for high-dynamic-range signal conditioning. It delivers 400MHz bandwidth at G = +10, 1.2nV/√Hz input voltage noise, –100dBc 2nd-harmonic distortion at 5MHz, 625V/µs slew rate, and stable operation down to gain ≥ +7 - enabling precision preamplification in ultrasound channel receivers and high-speed ADC front ends.
For engineers reviewing the OPA846IDR datasheet, OPA846IDR pinout, OPA846IDR application, or OPA846IDR equivalent, this page provides verified specifications, SO-8 package terminal mapping, transimpedance design guidance, DC accuracy metrics (±150µV VIO), and validated alternatives for wideband analog signal chain optimization.
Technical Context
The OPA846IDR employs a classical differential input stage followed by two forward-gain stages and a high-power output stage, delivering exceptional linearity and DC precision. Its voltage-feedback architecture supports standard op amp configurations while maintaining stability at gains ≥ +7 - unlike current-feedback amplifiers requiring fixed feedback impedance.
It achieves 1750MHz gain-bandwidth product with 1.2nV/√Hz input voltage noise and 2.8pA/√Hz input current noise, making it uniquely suited for wideband transimpedance amplifiers where diode capacitance dominates noise contribution. External compensation enables flat frequency response below minimum stable gain, extending utility to low-gain, high-SFDR applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 1750MHz - enables 200MHz closed-loop bandwidth at G = –2 with external compensation, supporting high-fidelity RF/IF signal chains. |
| Input Voltage Noise | 1.2nV/√Hz - sets fundamental SNR floor in low-source-impedance applications like photodiode transimpedance stages. |
| Slew Rate | 625V/µs - ensures faithful reproduction of fast transient signals (e.g., ultrasound pulses) without slewing-induced distortion. |
| Harmonic Distortion | –100dBc (2nd, 5MHz, RL = 500Ω) - meets stringent SFDR requirements for 12–16-bit ADC drivers in medical imaging. |
| Input Offset Voltage | ±150µV - enables accurate DC-coupled gain stages without significant output error in precision sensor interfaces. |
| Supply Current | 12.6mA - balances ultra-wideband performance with power efficiency in multi-channel systems (e.g., ultrasound beamformers). |
| Stable Gain Range | G ≥ +7 - defines minimum closed-loop gain for unconditional stability; lower gains require external compensation networks. |
Pinout & Package
OPA846IDR is housed in an SO-8 (D) package with exposed pad for thermal enhancement. Pin 1 is marked with a dot; pins are numbered counterclockwise. All NC pins are internally unconnected and must remain floating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–) | High-impedance differential input node; connects to feedback network in inverting configurations. |
| 2 | Noninverting Input (+) | High-impedance differential input node; used for reference biasing or noninverting gain paths. |
| 3 | Output | Class-AB output stage capable of ±60mA sourcing/sinking into 100Ω loads with ±3.3V swing. |
| 4 | –VS | Negative supply rail connection; requires local 0.1µF + 6.8µF decoupling per TI layout guidelines. |
| 5 | +VS | Positive supply rail connection; same decoupling as –VS; supports ±5V nominal operation. |
| 6–8 | No Connection (NC) | Internally unconnected; must be left unpopulated or tied to ground only if required for mechanical stability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage noise | 1.2nV/√Hz enables sub-picoampere-equivalent input-referred noise in transimpedance designs with <50pF photodiode capacitance. |
| High slew rate with low distortion | 625V/µs slew rate combined with –100dBc 2nd-harmonic distortion preserves signal integrity in wideband pulse amplification. |
| DC precision at high speed | ±150µV VIO and ±0.4µV/°C drift allow DC-coupled, multi-stage gain without calibration in industrial sensor front ends. |
| External compensation support | Enables stable operation at G = +2 with 142MHz flat bandwidth and full 625V/µs slew rate - critical for low-gain, high-SFDR receivers. |
| Thermal robustness | Specified over –40°C to +85°C with θJA = 125°C/W (SO-8), supporting reliable operation in enclosed medical or test equipment enclosures. |
Applications
| Ultrasound Channel Amplifier | VDSL Line Receiver |
|---|---|
Use Scenario: Amplifying weak echo signals from piezoelectric transducers in portable ultrasound systems with 5–15MHz bandwidth requirements. IC Role / Device Role / Timing Role: First-stage low-noise voltage amplifier in multi-channel receive beamformer ASIC interface. Use Value: 1.2nV/√Hz input noise and 400MHz bandwidth at G = +10 enable >70dB SNR in 12-bit digitization of microvolt-level echoes. |
Use Scenario: Receiving asymmetric upstream/downstream signals in VDSL2 line cards operating up to 30MHz. IC Role / Device Role / Timing Role: High-linearity analog front-end driver for ADSL/VDSL CODEC inputs with precise gain matching. Use Value: –100dBc harmonic distortion at 5MHz and ±150µV VIO ensure minimal crosstalk and baseline wander in multi-pair DSLAM systems. |
| High-Dynamic-Range ADC Preamplifier | Security Sensor Front End |
Use Scenario: Driving 14–16-bit, 100MSPS ADCs in radar warning receivers and spectrum analyzers requiring >90dB SFDR. IC Role / Device Role / Timing Role: Final gain stage before ADC sampling, configured for G = +10 with matched 50Ω source/load termination. Use Value: 1750MHz GBP and 625V/µs slew rate prevent settling errors and maintain ENOB across full Nyquist band. |
Use Scenario: Conditioning low-amplitude signals from passive infrared (PIR) or microwave Doppler sensors in smart building systems. IC Role / Device Role / Timing Role: Low-noise, single-supply-capable amplifier for battery-operated motion detectors with microamp-level quiescent current budgets. Use Value: 12.6mA supply current and 1.2nV/√Hz noise enable >60dB dynamic range in compact, thermally constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wideband, low-noise operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA847 | Lower input voltage noise (0.85nV/√Hz) but higher supply current (17.5mA); GBP = 3900MHz; unstable below G = +15. | Better for ultra-low-noise transimpedance stages with >100pF detector capacitance; unsuitable for G = +7–+10 stable operation. | Select OPA847 only when noise dominates power budget and gain ≥ +15 is acceptable. |
| LMH6624 | Higher input voltage noise (1.3nV/√Hz); lower GBP (1500MHz); stable down to G = +1; 13.5mA supply current. | Preferred for unity-gain buffer or low-gain video distribution; lacks OPA846IDR's distortion performance at 5MHz. | Choose LMH6624 when pin-compatible SO-8 layout reuse is required and –100dBc distortion is not mandatory. |
Compared with OPA846IDR, OPA847 offers superior noise but demands higher gain and power, while LMH6624 trades noise and distortion for universal stability - making OPA846IDR the optimal balance for G = +7–+10, low-distortion, moderate-power wideband amplification.
Availability
OPA846IDR is available at Aetrix Electronics and suitable for ultrasound imaging systems, VDSL line cards, high-speed data acquisition modules, and security sensor front ends requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for OPA846IDR 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 signal chain solutions.
The OPA846IDR belongs to TI's OPAx84x family of ultra-wideband, low-noise voltage-feedback amplifiers, designed specifically for demanding analog front ends in medical imaging, communications infrastructure, and test equipment.
FAQ
What is the minimum stable gain for OPA846IDR?
The OPA846IDR is unconditionally stable for closed-loop gains ≥ +7 in noninverting configuration. Gains below +7 require external compensation - such as the CS/CF network shown in Figure 5 of the datasheet - to maintain phase margin and prevent peaking. This design technique preserves full slew rate while achieving flat 142MHz bandwidth at G = –2.
Can OPA846IDR operate on single-supply rails?
Yes, OPA846IDR supports single-supply operation with proper input common-mode and output swing constraints. At VS = +10V (GND = 0V), its CMIR extends to +3.2V and output swing reaches +3.3V into 400Ω, enabling use in DC-coupled sensor interfaces. However, bipolar supplies (±5V) are recommended for maximum dynamic range and distortion performance in AC-coupled applications like VDSL receivers.
How does OPA846IDR compare to OPA657 in transimpedance applications?
OPA846IDR excels in low-capacitance (<50pF) photodiode applications due to its 1.2nV/√Hz voltage noise, while OPA657 (JFET input) is superior for high-capacitance (>100pF) detectors due to its 0.95pA/√Hz current noise. In a 10kΩ transimpedance stage with 50pF diode capacitance, OPA846IDR yields 4.9pA/√Hz equivalent input noise vs. 7.0pA/√Hz for a 2.0nV/√Hz alternative - confirming its advantage in voltage-noise-limited scenarios.
What PCB layout practices are critical for OPA846IDR performance?
TI specifies strict layout rules for OPA846IDR: ground plane under the SO-8 body, 0.1µF ceramic + 6.8µF tantalum decoupling on each supply pin within 2mm, short high-impedance traces to inputs, and symmetric routing for inverting/noninverting paths. Parasitic capacitance at the inverting input must be minimized - exceeding 0.5pF degrades bandwidth and stability, especially in transimpedance configurations.
Is OPA846IDR suitable for driving ADC inputs directly?
Yes, OPA846IDR is explicitly qualified as a premier driver for 12–16-bit ADCs. Its 625V/µs slew rate, 15ns 0.01% settling time, and –100dBc distortion at 5MHz ensure minimal code-dependent errors and high effective number of bits (ENOB). When driving ADCs with 50Ω input impedance, configure as G = +10 with matched 50Ω source/load termination per Figure 1 in SBOS250E.
OPA846IDR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 625V/µs
- Gain Bandwidth Product:
- 1.75 GHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 10 µA
- Voltage - Input Offset:
- 150 µV
- Current - Supply:
- 12.6mA
- Current - Output / Channel:
- 80 mA
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 12 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
OPA846IDR FAQ
1.How can I place an order for OPA846IDR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA846IDR 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 OPA846IDR reliable?
The price and inventory of OPA846IDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA846IDR is usually 5 days.
3.What payment methods are accepted for OPA846IDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA846IDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA846IDR?
OPA846IDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA846IDR 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 OPA846IDR?
For technical support, including OPA846IDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA846IDR requirements.
6.How does Aetrix verify that OPA846IDR is sourced from the original manufacturer or authorized distributors?
All OPA846IDR 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 OPA846IDR meets industry standards.
7.What is the process for return or replacement of OPA846IDR?
All OPA846IDR units undergo pre-shipment inspection (PSI). If there is an issue with OPA846IDR, 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 OPA846IDR part is unused and in its original packaging.
Return procedure for OPA846IDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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