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Texas Instruments OPA857IRGTR
- Part No.:
- OPA857IRGTR
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
OPA857IRGTR.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,126
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Product details
Overview
OPA857IRGTR from Texas Instruments is an ultralow-noise, wideband transimpedance amplifier (TIA) with selectable 5-kΩ or 20-kΩ internal feedback resistance, 125 MHz / 105 MHz closed-loop bandwidth, 15 nARMS input-referred current noise (20-kΩ gain), and <25 ns overload recovery time - designed for photodiode monitoring in high-speed optical receivers and CAT-scan front-ends.
For engineers reviewing the OPA857IRGTR datasheet, OPA857IRGTR pinout, OPA857IRGTR application, or OPA857IRGTR equivalent, this page delivers verified specifications, validated pin functions, real-world photodiode interface use cases, and two confirmed alternative TI transimpedance amplifiers - all grounded in SBOS630D production data.
Technical Context
The OPA857IRGTR implements a pseudo-differential output architecture with internal midscale reference (1.83 V) and dual-gain TIA core using RF1/RF2 selectable feedback paths. Its class-A output stage delivers 1.2-V differential swing on 3.3-V supply while maintaining >100-MHz bandwidth across –40°C to +85°C.
Input protection includes integrated clamping diodes and ESD-rated IN pin (±2000 V HBM). The CTRL pin selects gain via logic-level interface (VIH ≥ 2 V, VIL ≤ 0.8 V), enabling dynamic range adaptation without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Transimpedance Gain | 4.5 kΩ (CTRL = 0) or 18.2 kΩ (CTRL = 1) into 500-Ω differential load - defines max photocurrent-to-voltage conversion ratio and system sensitivity. |
| Closed-Loop Bandwidth | 125 MHz (5-kΩ mode) or 105 MHz (20-kΩ mode) at 1.5-pF source capacitance - sets usable signal frequency range for high-speed optical detection. |
| Input-Referred Current Noise | 15 nARMS (20-kΩ, 135-MHz brickwall filter) - determines minimum detectable photocurrent in low-light applications. |
| Overload Recovery Time | <25 ns to 1% final value after 2× overload - ensures rapid return to linear operation following photodiode saturation events. |
| Supply Voltage Range | 2.7 V to 3.6 V - enables compatibility with modern low-voltage optical subsystems and battery-powered instrumentation. |
| Quiescent Current | 23.4 mA (typical, both gain modes) - establishes power budget for high-density optical receiver modules. |
| Operating Temperature | –40°C to +85°C - supports deployment in industrial and medical imaging environments. |
Pinout & Package
VQFN-16 (RGT) package, 3 mm × 3 mm body, 0.5-mm pitch, thermally enhanced exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 15) | Photocurrent input | High-impedance node connected to photodiode cathode; includes internal ESD diodes and clamping circuitry. |
| OUT (Pin 8) | Differential signal output | Active output terminal delivering pseudo-differential voltage swing referenced to OUTN; includes 25-Ω series resistor. |
| OUTN (Pin 5) | Common-mode reference output | Provides fixed 1.83-V midscale DC reference for fully differential signal chain interfacing and PSRR enhancement. |
| CTRL (Pin 2) | Gain selection control | Logic input: GND selects 5-kΩ gain, +VS selects 20-kΩ gain - enables real-time dynamic range adjustment. |
| +VS (Pins 9, 10, 11) | Positive supply | Three dedicated supply pins reduce IR drop and improve PSRR; requires local 3.3-V decoupling near thermal pad. |
| GND (Pins 1, 3, 4, 6, 7, 12) | Ground reference | Six ground connections minimize ground bounce and ensure stable biasing of TIA core and reference blocks. |
| Test_SD (Pin 13) | Test mode enable | Connect to GND for normal operation; tie to +VS only during factory characterization - not for end-user use. |
| Test_IN (Pin 14) | Test mode input | Connect to +VS during normal operation; used internally for parametric test access - no functional role in application. |
Key Features
| Feature | Design Value |
|---|---|
| Pseudo-differential output architecture | Delivers single-ended photocurrent input to differential voltage output with 1.83-V common-mode reference - simplifies interface to ADCs and high-PSRR signal chains. |
| Selectably optimized transimpedance gain | Hardware-selectable 4.5 kΩ / 18.2 kΩ effective gains (via CTRL pin) - enables one device to serve both high-bandwidth/low-gain and high-sensitivity/low-bandwidth optical channels. |
| Ultralow input-referred current noise | 15 nARMS at 20-kΩ gain with 135-MHz brickwall filter - achieves sub-picoampere resolution in time-of-flight and LIDAR front-ends. |
| Fast overload recovery | <25 ns recovery to 1% after 2× overdrive - prevents dead time in burst-mode optical receivers and pulsed laser detection systems. |
| Integrated input protection | On-chip clamping diodes and ±2000-V HBM ESD rating - eliminates need for external TVS diodes in photodiode bias path. |
Applications
| Photodiode Monitoring in Optical Receivers | High-Speed I/V Conversion for LIDAR |
|---|---|
Use Scenario: Converting weak, fast-rising photocurrent pulses from edge-emitting lasers into clean differential voltage signals for digitization in 10-Gbps optical links. IC Role / Device Role / Timing Role: Transimpedance amplifier providing gain, bandwidth, and overload resilience directly at photodiode node - acts as first active stage in analog front-end. Use Value: 125-MHz bandwidth at 5-kΩ gain enables accurate pulse shape preservation; 15-nARMS noise ensures >60-dB SNR for low-light detection. |
Use Scenario: Digitizing nanosecond-scale return pulses from 905-nm pulsed lasers in automotive LIDAR systems operating at ambient temperatures up to +85°C. IC Role / Device Role / Timing Role: High-linearity TIA with sub-25-ns recovery enabling rapid successive pulse capture without baseline shift or settling error. Use Value: Dual-gain selection allows switching between long-range (20-kΩ) and high-speed (5-kΩ) modes; VQFN thermal performance sustains reliability under continuous pulsed operation. |
| CAT-Scanner Front-End Signal Conditioning | Optical Amplifier Monitor Channel |
Use Scenario: Amplifying low-level scintillation detector currents in computed tomography systems where radiation-induced transients must be rejected without signal loss. IC Role / Device Role / Timing Role: Radiation-tolerant TIA with internal clamping and fast recovery - serves as primary current-to-voltage converter before precision ADC sampling. Use Value: 105-MHz bandwidth at 20-kΩ gain preserves pulse fidelity from fast-decay scintillators; –40°C to +85°C rating matches gantry thermal cycling requirements. |
Use Scenario: Real-time monitoring of pump laser current in Erbium-doped fiber amplifiers (EDFA) to maintain gain stability and prevent optical surges. IC Role / Device Role / Timing Role: Low-drift, low-noise TIA measuring back-facet photodiode current - provides closed-loop feedback to laser driver ICs. Use Value: ±1-mV offset and ±15-μV/°C drift ensure stable bias point over temperature; 23.4-mA quiescent current fits within tight power budgets of pluggable optical modules. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transimpedance amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA858IDSGR | Higher 200-MHz bandwidth (5-kΩ), lower 12-nARMS noise (20-kΩ), but requires external feedback resistors and lacks integrated REF/OUTN reference. | Used where maximum bandwidth/noise performance justifies added layout complexity and external component count. | Select when system demands >125-MHz bandwidth and board space permits discrete feedback network design. |
| LMH6629MA/NOPB | Fixed 10-kΩ transimpedance gain, 1.5-GHz gain-bandwidth product, higher 28-mA quiescent current, no integrated reference or gain select. | Deployed in broadband RF I/V conversion where fixed gain and ultra-wide GBW outweigh need for programmability or low-noise optimization. | Choose for applications requiring flat frequency response beyond 100 MHz with minimal phase distortion, accepting higher power and no gain switching. |
Compared with OPA857IRGTR, OPA858IDSGR offers superior raw bandwidth and noise but sacrifices integration and ease of use; LMH6629MA/NOPB trades programmability and reference integration for extreme small-signal linearity and wideband flatness - making OPA857IRGTR optimal for compact, temperature-stable, dual-gain optical monitoring.
Availability
OPA857IRGTR is available at Aetrix Electronics and suitable for photodiode monitoring, CAT-scan front-ends, and LIDAR receiver designs requiring stable component supply, guaranteed long-term manufacturability, and full industrial temperature support.
Supply support for OPA857IRGTR 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 signal chain solutions.
The OPA857IRGTR belongs to TI's precision high-speed amplifier portfolio, engineered specifically for low-noise, wideband optical current-to-voltage conversion in medical imaging, test equipment, and industrial sensing applications.
FAQ
What is the function of the OUTN pin on the OPA857IRGTR?
The OUTN pin on the OPA857IRGTR provides a stable 1.83-V midscale reference voltage that establishes the common-mode level for the pseudo-differential output pair (OUT/OUTN). This internal reference enables direct interfacing with fully differential ADCs and improves power-supply rejection by allowing common-mode feedthrough cancellation - a key advantage over single-ended output TIAs. The OPA857IRGTR uses this architecture to maintain signal integrity without external level-shifting components.
How does the CTRL pin select transimpedance gain in the OPA857IRGTR?
The CTRL pin on the OPA857IRGTR is a digital logic input that configures internal feedback resistance: applying GND selects the 5-kΩ path (yielding 4.5 kΩ effective gain into 500-Ω load), while applying +VS selects the 20-kΩ path (yielding 18.2 kΩ effective gain). VIH ≥ 2 V and VIL ≤ 0.8 V thresholds ensure robust noise immunity. This hardware-selectable gain allows the same OPA857IRGTR to adapt to varying photodiode responsivity and dynamic range requirements without changing external components.
What is the maximum input photocurrent the OPA857IRGTR can handle before saturation?
At 3.3-V supply, the OPA857IRGTR delivers a 1.2-V differential output swing. With 18.2-kΩ effective transimpedance gain (CTRL = 1), this corresponds to a maximum linear input current of approximately 66 µA; with 4.5-kΩ gain (CTRL = 0), it supports up to ~267 µA. Exceeding these values causes clipping, but the OPA857IRGTR recovers in under 25 ns - critical for burst-mode optical systems. These limits are derived from the specified output swing and measured transimpedance gain in SBOS630D.
Does the OPA857IRGTR require external compensation capacitors?
No, the OPA857IRGTR is internally compensated for stable operation with 1.5-pF total source capacitance (including photodiode junction capacitance and PCB parasitics). Texas Instruments characterizes bandwidth and noise performance assuming this 1.5-pF condition - exceeding it reduces bandwidth and increases noise peaking. Layout best practices emphasize minimizing trace length and ground plane clearance around the IN pin to hold total capacitance near the 1.5-pF target; no external capacitor is needed or recommended for standard operation.
Is the OPA857IRGTR suitable for operation at 2.7-V supply?
Yes, the OPA857IRGTR is fully specified from 2.7 V to 3.6 V supply voltage, with all key parameters - including 105/125-MHz bandwidth, 15/25-nARMS noise, and <25-ns overload recovery - guaranteed across this range per SBOS630D Section 6.3. At 2.7 V, quiescent current drops slightly (~20.5 mA typ), and output swing compresses to ~1.0 V differential, but transimpedance accuracy and thermal performance remain validated from –40°C to +85°C - making the OPA857IRGTR viable for battery-powered portable optical sensors.
OPA857IRGTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Transimpedance
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 220V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 130 MHz
- Current - Input Bias:
- 1 µA
- Voltage - Input Offset:
- -
- Current - Supply:
- 23.4mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply Span (Min):
- 2.6 V
- Voltage - Supply Span (Max):
- 3.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (3x3)
OPA857IRGTR FAQ
1.How can I place an order for OPA857IRGTR through Aetrix?
Please submit a Request for Quotation (RFQ) for OPA857IRGTR 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 OPA857IRGTR reliable?
The price and inventory of OPA857IRGTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for OPA857IRGTR is usually 5 days.
3.What payment methods are accepted for OPA857IRGTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for OPA857IRGTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for OPA857IRGTR?
OPA857IRGTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your OPA857IRGTR 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 OPA857IRGTR?
For technical support, including OPA857IRGTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your OPA857IRGTR requirements.
6.How does Aetrix verify that OPA857IRGTR is sourced from the original manufacturer or authorized distributors?
All OPA857IRGTR 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 OPA857IRGTR meets industry standards.
7.What is the process for return or replacement of OPA857IRGTR?
All OPA857IRGTR units undergo pre-shipment inspection (PSI). If there is an issue with OPA857IRGTR, 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 OPA857IRGTR part is unused and in its original packaging.
Return procedure for OPA857IRGTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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