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Texas Instruments OPA856IDSGR
- Part No.:
- OPA856IDSGR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-WFDFN Exposed Pad
- Datasheet:
-
OPA856IDSGR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8WSON
- Quantity:
- Payment:
- Shipping:
Inventory:1,100
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Product details
Overview
OPA856IDSGR from Texas Instruments is a 1.1-GHz unity-gain bandwidth, bipolar-input operational amplifier optimized for transimpedance and high-speed voltage amplification in optical time-of-flight (ToF) systems. It delivers 0.9 nV/√Hz input voltage noise, 350 V/µs slew rate, and operates from 3.3 V to 5.25 V supply - enabling high-bandwidth photodiode signal conditioning in LIDAR receiver front ends.
For engineers reviewing the OPA856IDSGR datasheet, OPA856IDSGR pinout, OPA856IDSGR application, or OPA856IDSGR equivalent, this device is selected for ultra-low-noise, wideband analog signal acquisition where closed-loop bandwidth >200 MHz and integrated input-referred noise <1.2 nV/√Hz are required in photodetector interfaces.
Technical Context
The OPA856IDSGR implements a voltage-feedback op amp architecture with bipolar input stage, delivering 1.1 GHz gain-bandwidth product and 110 MHz large-signal bandwidth at 2 VPP. Its feedback (FB) pin-internally tied to the output-enables compact, low-parasitic feedback routing directly adjacent to the inverting input (IN–), isolated by an NC pin to suppress capacitive coupling.
Designed specifically for optical ToF receivers, it interfaces with time-to-digital converters (e.g., TDC7201) and differential ADC drivers (e.g., THS4541), supporting transimpedance configurations with photodiode capacitances up to 20 pF while maintaining >135 MHz closed-loop bandwidth and <135 nARMS integrated input-referred noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Unity-gain bandwidth | 1.1 GHz - enables stable unity-gain operation with >175 MHz 0.1-dB flatness for precision pulse fidelity. |
| Input voltage noise | 0.9 nV/√Hz at 1 MHz - minimizes contribution to total system noise floor in weak-signal photodiode applications. |
| Slew rate | 350 V/µs - supports accurate reproduction of sub-ns optical pulses (e.g., OTDR, LIDAR return signals). |
| Input capacitance | 0.7 pF differential / 0.4 pF common-mode - reduces phase margin degradation in high-Z photodiode nodes. |
| Supply range | 3.3 V to 5.25 V - compatible with standard industrial and automotive single-supply rails, including 3.3 V and 5 V systems. |
| Operating temperature | –40°C to +125°C - qualified for under-hood, industrial, and outdoor LIDAR environments. |
| Power-down current | 70–85 µA - enables low-power idle mode in battery-operated drone or robotic vision systems. |
Pinout & Package
OPA856IDSGR is housed in an 8-pin WSON (DSG) package measuring 2.00 mm × 2.00 mm with exposed thermal pad. The package supports high-frequency layout integrity via optimized pin spacing and dedicated FB pin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - FB | Feedback connection | Internally tied to output; enables direct, low-inductance RF routing to IN– without crossing package edges. |
| 2 - NC | No connect | Floating isolation pin; increases physical separation between FB and IN– to reduce high-frequency capacitive coupling. |
| 3 - IN– | Inverting input | Primary input node for transimpedance configuration; low 0.7 pF differential capacitance preserves stability. |
| 4 - IN+ | Noninverting input | Used for bias cancellation or reference level setting; common-mode range extends to within 1.1 V of rails. |
| 5 - VS– | Negative supply | Ground or negative rail; thermal pad must be connected to VS– for optimal thermal performance. |
| 6 - OUT | Amplifier output | Capable of sourcing/sinking ±80 mA linearly; swing limited to ~3 V for optimal slew rate and noise trade-off. |
| 7 - VS+ | Positive supply | 3.3 V to 5.25 V input; PSRR+ >80 dB ensures immunity to supply ripple in noisy digital environments. |
| 8 - PD | Power-down control | Logic-compatible enable: <0.65 V = off (85 µA), >1.5 V = active; 15 ns turnon/250 ns turnoff support burst-mode operation. |
Key Features
| Feature | Design Value |
|---|---|
| Optimized TIA layout topology | FB pin adjacent to IN– with NC isolation reduces parasitic CFB–IN–, enabling stable >200 MHz closed-loop bandwidth with 10–20 pF photodiode capacitance. |
| Bipolar input stage | Delivers 0.9 nV/√Hz noise and –15 µA typical input bias current - ideal for low-leakage photodiode and SiPM interfaces requiring minimal DC error. |
| High-speed power-down | 250 ns turnoff and 15 ns turnon allow precise gating of amplifier activity during laser pulse windows, reducing system power by >99% in standby. |
| Thermal-enhanced WSON | Exposed thermal pad connected to VS– achieves RθJB = 45 °C/W - critical for maintaining <125°C junction temperature in compact LIDAR modules. |
| Robust ESD protection | ±1500 V HBM/CDM rating on all pins - withstands handling and board-level ESD events without latch-up or parametric shift. |
Applications
| Optical Time-Domain Reflectometry (OTDR) | Laser Distance Measurement |
|---|---|
Use Scenario: Detecting backscattered light pulses from fiber-optic faults over distances up to 100 km with nanosecond timing resolution. IC Role / Device Role / Timing Role: Transimpedance amplifier converting photodiode current to high-fidelity voltage waveform with <1 ns edge fidelity. Use Value: 350 V/µs slew rate and 1.1 GHz bandwidth preserve pulse rise time, enabling <1 m spatial resolution in long-haul fiber testing. | Use Scenario: Measuring distance to static or moving objects using pulsed laser time-of-flight in handheld survey tools. IC Role / Device Role / Timing Role: Front-end amplifier for avalanche photodiode (APD) or SiPM in compact, battery-powered distance meters. Use Value: 0.9 nV/√Hz noise and 0.7 pF input capacitance maximize SNR in low-light conditions, extending measurement range beyond 50 m. |
| Solid-State Scanning LIDAR | SiPM Buffer Amplifier |
Use Scenario: Real-time 3D mapping in autonomous mobile robots using MEMS-mirror-based scanning LIDAR. IC Role / Device Role / Timing Role: High-speed voltage amplifier driving differential ADC inputs after TIA stage in multi-channel receiver ASICs. Use Value: 110 MHz large-signal bandwidth and 2.5 pA/√Hz current noise ensure accurate digitization of fast-return pulses across full field-of-view. | Use Scenario: Signal conditioning for silicon photomultiplier arrays used in medical PET scanners and radiation detection. IC Role / Device Role / Timing Role: Low-noise, high-bandwidth buffer amplifying SiPM output before time-over-threshold discrimination. Use Value: Bipolar input stage provides –15 µA bias current compatibility with SiPM cathode biasing, avoiding signal distortion from leakage currents. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, low-noise amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA855IDSGR | Higher minimum stable gain (7 V/V vs 1 V/V); 0.98 nV/√Hz noise; 8 GHz GBWP but requires gain ≥7 for stability. | Not suitable for unity-gain TIA configurations; better for fixed-gain post-amplification stages. | Select OPA855IDSGR only when closed-loop gain ≥7 V/V is acceptable and higher GBWP justifies reduced noise margin. |
| LMH5401RTWT | Differential output; 18 GHz GBWP; 2.2 nV/√Hz noise; requires external common-mode feedback network. | Designed for driving high-speed ADCs directly; lacks integrated FB pin and photodiode-optimized input capacitance. | Choose LMH5401RTWT when driving fully differential ADC inputs with >1 GSPS sampling; not drop-in for single-ended TIA designs. |
Compared with OPA855IDSGR and LMH5401RTWT, the OPA856IDSGR uniquely combines unity-gain stability, 0.9 nV/√Hz noise, and photodiode-optimized pinout - making it the only option among the three for low-capacitance, single-supply, unity-gain transimpedance amplifiers in portable ToF systems.
Availability
OPA856IDSGR is available at Aetrix Electronics and suitable for optical time-domain reflectometry (OTDR), solid-state scanning LIDAR, and silicon photomultiplier (SiPM) buffer amplifier applications requiring stable component supply across automotive, industrial, and medical design cycles.
Supply support for OPA856IDSGR 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 delivering analog and embedded processing solutions for industrial, automotive, and communications markets.
The OPA856IDSGR belongs to TI's high-speed precision amplifier portfolio, engineered specifically for optical sensing front ends where bandwidth, noise, and layout robustness jointly determine system-level time-of-flight accuracy.
FAQ
What is the maximum photodiode capacitance supported by OPA856IDSGR in transimpedance configuration?
The OPA856IDSGR maintains >135 MHz closed-loop bandwidth with integrated input-referred noise <135 nARMS for photodiode capacitances up to 20 pF when configured with RF = 5 kΩ, as validated in Figure 1 of the SBOS623 datasheet. Stability is preserved across this range due to its low 0.7 pF differential input capacitance and FB/IN– pin isolation.
Does OPA856IDSGR require external compensation for unity-gain stability?
No, the OPA856IDSGR is internally compensated for unity-gain stability, with 57° phase margin verified in Figure 8-5 of the datasheet. It operates stably at G = 1 V/V without external compensation components, unlike the OPA855IDSGR which requires minimum gain of 7 V/V.
Can OPA856IDSGR operate from a single 3.3-V supply?
Yes, OPA856IDSGR is fully specified for 3.3 V to 5.25 V total supply range. At 3.3 V, it delivers VOH = 2.4 V and VOL = 1.15 V (typical), with common-mode input range extending from 1.1 V to 2.9 V - sufficient for midsupply-biased photodiode interfaces in space-constrained 3.3-V systems.
How does the FB pin improve PCB layout for high-frequency TIA designs?
The FB pin (Pin 1) on OPA856IDSGR allows the feedback resistor to route directly to the adjacent IN– pin (Pin 3) on the same side of the package, minimizing loop area and parasitic inductance. Combined with the NC pin (Pin 2) isolating FB from IN–, this reduces high-frequency capacitive coupling that could degrade phase margin in >200 MHz designs.
What is the typical power-down quiescent current of OPA856IDSGR?
The typical power-down quiescent current of OPA856IDSGR is 70–85 µA, as specified in Section 7.5 of the SBOS623 datasheet. This low standby current enables energy-efficient burst-mode operation in battery-powered LIDAR and drone vision systems where the amplifier is gated synchronously with laser pulses.
OPA856IDSGR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 350V/µs
- Gain Bandwidth Product:
- 1.08 GHz
- -3db Bandwidth:
- 1.1 GHz
- Current - Input Bias:
- 15 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 17.2mA
- Current - Output / Channel:
- 105 mA
- Voltage - Supply Span (Min):
- 3.3 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-WSON (2x2)
OPA856IDSGR FAQ
1.How can I place an order for OPA856IDSGR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA856IDSGR 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 OPA856IDSGR reliable?
The price and inventory of OPA856IDSGR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA856IDSGR is usually 5 days.
3.What payment methods are accepted for OPA856IDSGR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA856IDSGR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA856IDSGR?
OPA856IDSGR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA856IDSGR 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 OPA856IDSGR?
For technical support, including OPA856IDSGR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA856IDSGR requirements.
6.How does Aetrix verify that OPA856IDSGR is sourced from the original manufacturer or authorized distributors?
All OPA856IDSGR 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 OPA856IDSGR meets industry standards.
7.What is the process for return or replacement of OPA856IDSGR?
All OPA856IDSGR units undergo pre-shipment inspection (PSI). If there is an issue with OPA856IDSGR, 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 OPA856IDSGR part is unused and in its original packaging.
Return procedure for OPA856IDSGR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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