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Texas Instruments OPA847IDBVTG4
- Part No.:
- OPA847IDBVTG4
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-6
- Datasheet:
-
OPA847IDBVTG4.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:3,999
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Product details
Overview
OPA847IDBVTG4 from Texas Instruments is a wideband, ultra-low-noise voltage-feedback operational amplifier in SOT-23-6 package with shutdown control, 3.9GHz gain bandwidth, 0.85nV/√Hz input voltage noise, and –105dBc harmonic distortion at 5MHz - optimized for high-dynamic-range ADC preamplifiers and differential receiver interfaces.
For engineers reviewing the OPA847IDBVTG4 datasheet, OPA847IDBVTG4 pinout, OPA847IDBVTG4 application, or OPA847IDBVTG4 equivalent, key selection criteria include stability at gains ≥12V/V, sub-2ns settling time to 0.1%, shutdown quiescent current <370µA, and compatibility with ±5V supplies in space-constrained RF/medical front-ends.
Technical Context
The OPA847IDBVTG4 employs a voltage-feedback architecture with unity-gain unstable design (stable only for G ≥ +12), enabling flat frequency response up to 350MHz at G = +20 while maintaining 950V/µs slew rate and 20ns settling to 0.01%. Its internal compensation supports external tuning for inverting configurations down to G = –1 and differential gain stages with >100dB SFDR.
It integrates a dedicated power-down pin (Pin 5) that reduces supply current to <0.2% of active mode (<370µA) with 60ns power-up time, and features matched input impedance in inverting mode via 50Ω RG termination - critical for broadband transimpedance and ADC driver applications requiring minimal signal reflection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 3.9GHz - enables 350MHz closed-loop bandwidth at G=+20, supporting 125MSPS ADC interfaces without bandwidth limiting. |
| Input Voltage Noise Density | 0.85nV/√Hz @ f >1MHz - sets fundamental sensitivity floor in photodiode transimpedance amplifiers with CD ≤100pF. |
| Harmonic Distortion | –105dBc (2nd/3rd, 5MHz, RL=500Ω) - ensures <–90dBc SFDR through 30MHz in differential ADC drivers. |
| Slew Rate | 950V/µs - preserves large-signal fidelity for 2VPP outputs at >100MHz without slewing-induced distortion. |
| Supply Current | 18.1mA @ ±5V - balances ultra-wideband performance with thermal management in compact SOT-23 layouts. |
| Shutdown Quiescent Current | <370µA - reduces system standby power by >98%, enabling burst-mode operation in portable ultrasound receivers. |
| Stable Gain Minimum | G ≥ +12V/V - mandates external compensation for lower gains but avoids phase-margin trade-offs in precision gain stages. |
Pinout & Package
SOT-23-6 package (DBV), 2.9mm × 1.6mm footprint, 0.95mm height, thermal resistance θJA = 150°C/W - suitable for high-density PCBs with localized thermal relief.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–) | Differential node for inverting gain configuration; requires 50Ω source termination for optimal bandwidth/noise matching. |
| 2 | Noninverting Input (+) | High-impedance input node; 12kΩ-to-ground bias resistor minimizes DC offset in transimpedance designs. |
| 3 | Output | Capable of ±3.4V swing into 100Ω; drives 50Ω transmission lines directly with <0.1dB gain flatness to 60MHz. |
| 4 | –VS | Negative supply rail; decoupling with 0.1µF ceramic + 6.8µF tantalum required within 5mm for PSRR >90dB. |
| 5 | DIS (Shutdown) | Active-low enable; floats to enable, pulled low (<1.5V) to disable amplifier and reduce IQ to <370µA. |
| 6 | +VS | Positive supply rail; same decoupling requirements as –VS; supports ±5V nominal, ±6V absolute max. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input voltage noise | 0.85nV/√Hz enables sub-picoamp input-referred noise in 20kΩ transimpedance stages with 100pF diode capacitance. |
| High-speed shutdown control | 60ns power-up / 200ns power-down timing allows synchronous gating in time-of-flight ultrasound beamforming. |
| External compensation support | Enables stable operation at G = –1 to –50 via RF/CS/CF tuning - critical for matched 50Ω inverting ADC interfaces. |
| Differential output capability | Paired OPA847IDBVTG4 units achieve >100dB CMRR and <–90dBc distortion in ADS5500 14-bit 125MSPS differential driver circuits. |
| Low distortion at high frequencies | –105dBc 3rd-harmonic at 5MHz (RL=500Ω) sustains ENOB >11.5 in 125MSPS sampling systems up to Nyquist. |
Applications
| High-Dynamic-Range ADC Preamplifier | Wideband Transimpedance Amplifier |
|---|---|
Use Scenario: Driving ADS5500 14-bit 125MSPS ADC with 24.6dB gain and <5.1dB noise figure in communications baseband receivers. IC Role / Device Role / Timing Role: Differential voltage gain stage providing 350MHz bandwidth, 0.85nV/√Hz noise floor, and –105dBc distortion to maximize SNR and SFDR. Use Value: Enables >74dBFS SNR at 10MHz input with 2VPP full-scale, exceeding ADC's intrinsic 72.5dB SNR limit. | Use Scenario: Converting photocurrent from 155Mbps OC-3 fiber receiver PIN diodes (CD ≈ 1pF) into amplified voltage with 104MHz flat bandwidth. IC Role / Device Role / Timing Role: Transimpedance amplifier with externally compensated CF = 0.18pF and RF = 12kΩ, leveraging 3.9GHz GBP and 0.85nV/√Hz noise. Use Value: Achieves 3.0pA/√Hz equivalent input noise - 23% lower than alternative OPA657-based designs at same bandwidth. |
| Low-Noise Differential Receiver | Ultrasound Channel Amplifier |
Use Scenario: Front-end gain block in medical ultrasound beamformers requiring matched gain/phase across 128 channels with <1ps skew. IC Role / Device Role / Timing Role: Single-ended-to-differential converter using transformer-coupled inputs and dual OPA847IDBVTG4 outputs with 8.5V/V gain. Use Value: Delivers <–90dBc distortion through 30MHz and 20ns settling to 0.01%, supporting 15MHz imaging bandwidth. | Use Scenario: Time-gain-control (TGC) amplifier in portable ultrasound probes operating from ±5V battery supplies. IC Role / Device Role / Timing Role: Variable-gain post-amplifier with shutdown-enabled channel muting during transmit/receive switching cycles. Use Value: Reduces idle power per channel by 98% (18.1mA → 370µA), extending probe battery life by >40% in handheld systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-noise, wideband op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA846IDBVR | 1.2nV/√Hz input noise, 1.75GHz GBP, no shutdown pin, SO-8 only | Lacks power-down control and SOT-23 packaging; higher noise limits sensitivity in low-light photodiode apps | Select when board space permits SO-8 and shutdown is unnecessary; avoid for battery-powered TGC stages |
| LMH6624MF/NOPB | 1.3nV/√Hz noise, 1.5GHz GBP, no shutdown, SOT-23-5 (no DIS pin) | 5-pin SOT-23 lacks dedicated shutdown; lower GBP restricts >100MHz ADC interface use | Use only in cost-sensitive, non-battery applications where 350MHz bandwidth is not required |
Compared with OPA847IDBVTG4, OPA846IDBVR trades 0.45nV/√Hz noise and shutdown capability for higher integration density in SO-8, while LMH6624MF/NOPB offers lower cost but sacrifices 2.4GHz GBP headroom and power-gating - making OPA847IDBVTG4 uniquely suited for space-constrained, high-SFDR, low-power medical/RF front-ends.
Availability
OPA847IDBVTG4 is available at Aetrix Electronics and suitable for high-dynamic-range ADC preamplifiers, wideband transimpedance amplifiers, low-noise differential receivers, and ultrasound channel amplifiers requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for OPA847IDBVTG4 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 innovation in high-performance op amps and data converters.
The OPA847IDBVTG4 belongs to TI's Ultra-Wideband, Low-Noise Op Amp product line, designed specifically for demanding signal-chain applications including medical imaging, test equipment, and high-speed communications where dynamic range, speed, and power efficiency are co-optimized.
FAQ
What is the minimum stable gain for OPA847IDBVTG4, and why does it matter?
The OPA847IDBVTG4 is stable only for noninverting gains ≥ +12V/V. This is due to its internal compensation optimized for ultra-wideband performance - attempting lower gains without external compensation causes peaking and potential oscillation. In practice, this means designers must use external RC networks for G < +12, especially in inverting configurations where noise gain determines stability. The OPA847IDBVTG4 datasheet provides specific compensation guidelines for gains down to –1V/V.
How does the shutdown pin (Pin 5) function on OPA847IDBVTG4?
Pin 5 (DIS) is an active-low shutdown control: pulling it below 1.5V disables the amplifier core and reduces quiescent current to <370µA, while floating or driving it >3.5V enables normal operation. Power-up time is 60ns and power-down time is 200ns - fast enough for burst-mode ultrasound receive gating. The OPA847IDBVTG4 maintains off-isolation >70dB at 5MHz, preventing signal leakage during shutdown.
Can OPA847IDBVTG4 drive 50Ω loads directly, and what layout considerations apply?
Yes - the OPA847IDBVTG4 delivers ±3.4V into 100Ω and maintains <0.1dB gain flatness to 60MHz into 50Ω loads when properly decoupled. Critical layout practices include placing 0.1µF ceramic + 6.8µF tantalum capacitors within 5mm of Pins 4 and 6, routing +VS/–VS traces symmetrically, and using ground vias adjacent to all pins. For 50Ω transmission lines, series termination at the output (not source) is recommended to preserve bandwidth.
What is the maximum input common-mode voltage range for OPA847IDBVTG4 at ±5V supplies?
At ±5V supplies, the OPA847IDBVTG4 supports a common-mode input range of ±2.9V minimum (±3.3V typical) - meaning inputs can swing from –3.3V to +3.3V while maintaining specified performance. This exceeds the ±2.5V range of many competing amplifiers, allowing direct interfacing with ±3.3V logic or attenuated RF signals without level-shifting. The OPA847IDBVTG4 maintains >90dB CMRR across this full range.
How does OPA847IDBVTG4 compare to OPA657 in transimpedance applications?
The OPA847IDBVTG4 (0.85nV/√Hz, 2.5pA/√Hz) excels in low-capacitance photodiode applications (CD < 50pF) where voltage noise dominates, while the JFET-input OPA657 (4.8nV/√Hz, 0.75pA/√Hz) is superior for high-capacitance detectors (CD > 200pF) where current noise dominates. In a 12kΩ, 100pF OC-3 receiver, OPA847IDBVTG4 achieves 3.0pA/√Hz equivalent input noise vs. 3.7pA/√Hz for a hypothetical 2.0nV/√Hz op amp - confirming its advantage in moderate-CD scenarios.
OPA847IDBVTG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 950V/µs
- Gain Bandwidth Product:
- 3.9 GHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 19 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 18.1mA
- Current - Output / Channel:
- 100 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:
- SOT-23-6
OPA847IDBVTG4 FAQ
1.How can I place an order for OPA847IDBVTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA847IDBVTG4 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 OPA847IDBVTG4 reliable?
The price and inventory of OPA847IDBVTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA847IDBVTG4 is usually 5 days.
3.What payment methods are accepted for OPA847IDBVTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA847IDBVTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA847IDBVTG4?
OPA847IDBVTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA847IDBVTG4 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 OPA847IDBVTG4?
For technical support, including OPA847IDBVTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA847IDBVTG4 requirements.
6.How does Aetrix verify that OPA847IDBVTG4 is sourced from the original manufacturer or authorized distributors?
All OPA847IDBVTG4 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 OPA847IDBVTG4 meets industry standards.
7.What is the process for return or replacement of OPA847IDBVTG4?
All OPA847IDBVTG4 units undergo pre-shipment inspection (PSI). If there is an issue with OPA847IDBVTG4, 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 OPA847IDBVTG4 part is unused and in its original packaging.
Return procedure for OPA847IDBVTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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