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Analog Devices Inc. LTC6268IS8#TRPBF
- Part No.:
- LTC6268IS8#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC6268IS8#TRPBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:634
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Product details
Overview
LTC6268IS8#TRPBF from Analog Devices (formerly Linear Technology) is a single-channel, 500MHz gain-bandwidth FET-input operational amplifier optimized for ultra-low input bias current (±3fA typ. at 25°C), 450fF common-mode input capacitance, and rail-to-rail output swing. It operates from 3.1V to 5.25V supply, draws 16.5mA quiescent current, and features active-low shutdown. It is used in high-speed transimpedance amplifiers for photodiode signal conditioning in optical sensing systems.
For engineers reviewing the LTC6268IS8#TRPBF datasheet, LTC6268IS8#TRPBF pinout, LTC6268IS8#TRPBF application, or LTC6268IS8#TRPBF equivalent, key selection criteria include confirmed fA-level input bias current, validated 350MHz –3dB bandwidth at unity gain, verified 4.3nV/√Hz voltage noise at 1MHz, and SO-8 package compatibility with guard-ring layout for leakage-sensitive sensor interfaces.
Technical Context
The LTC6268IS8#TRPBF employs a CMOS buffer stage followed by a complementary differential input pair, enabling stable operation across its full input common-mode range (0V to 4.5V at 5V supply) while maintaining ultra-low input current. Its architecture includes bootstrapped ESD protection diodes and a cascode output stage delivering 400V/µs slew rate and rail-to-rail output swing.
It supports dual-supply (±2.5V) or single-supply (3.1V–5.25V) operation, with shutdown control via SHDN pin (VIH = 1.5V, VIL = 0.75V). Input-referred voltage noise is 4.3nV/√Hz at 1MHz and 13µVP-P (0.1Hz–10Hz); current noise is 5.5fA/√Hz at 100kHz. Full-power bandwidth is 21MHz at 4VP-P.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 500MHz - enables stable closed-loop operation up to 350MHz at AV = 1, critical for high-speed TIA and ADC driver designs. |
| Input Bias Current | ±3fA typical at 25°C - ensures minimal DC error in picoampere-level photodiode or electrophysiology sensor front-ends. |
| Input Capacitance | 450fF common-mode - minimizes phase shift and instability in transimpedance configurations with low-CIN photodiodes. |
| Slew Rate | 400V/µs - supports fast settling of large-signal transients without distortion in SAR ADC driving applications. |
| Supply Range | 3.1V to 5.25V - compatible with standard 3.3V and 5V logic rails; allows direct interfacing with ADC reference voltages. |
| Operating Temp Range | –40°C to 125°C - qualified for industrial and automotive under-hood environments where thermal stability is essential. |
| Rail-to-Rail Output | Swings within 140mV of V+ and V– at 10mA load - maximizes dynamic range in single-supply systems without level-shifting circuitry. |
Pinout & Package
The LTC6268IS8#TRPBF is housed in an 8-lead plastic SOIC (SO-8) package with two unconnected pins (Pin 5 and Pin 8) intended for use as input guard ring traces to suppress PCB surface leakage currents.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Active-low shutdown control | Drives amplifier into 0.85mA shutdown mode when pulled ≤0.75V; left open for normal operation. |
| 2 (V+) | Positive power supply | Accepts 3.1V–5.25V; requires local 0.1µF bypass capacitor to ground for high-frequency stability. |
| 3 (OUT) | Amplifier output | Delivers rail-to-rail voltage swing; capable of sourcing/sinking 135mA peak (thermally limited). |
| 4 (V–) | Negative power supply | Typically grounded; may be biased to negative voltage if total V+–V– remains within 3.1V–5.25V range. |
| 5 (NC) | No connect | Reserved for guard ring routing around +IN/–IN to reduce board leakage paths in high-impedance nodes. |
| 6 (–IN) | Inverting input | Input voltage range: V– to V+ – 0.5V; differential CIN = 100fF, common-mode CIN = 450fF. |
| 7 (+IN) | Non-inverting input | Same voltage range and capacitance specs as –IN; matched to ±6fA offset current over temperature. |
| 8 (NC) | No connect | Second guard ring terminal; recommended to tie both NC pins to same guard potential for optimal leakage suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low input bias current | ±3fA typical at 25°C enables accurate measurement of sub-picoampere photocurrents without significant DC error. |
| Low input capacitance | 450fF common-mode input capacitance reduces feedback pole formation in TIAs, preserving bandwidth with low-CPD sensors. |
| Rail-to-rail output | Output swings within 140mV of each rail at 10mA load, maximizing signal headroom in 3.3V or 5V single-supply systems. |
| High-speed precision | –100dB harmonic distortion at 1MHz and 4.3nV/√Hz voltage noise support clean signal acquisition in high-resolution ADC drivers. |
| Integrated shutdown | 0.85mA shutdown current per amplifier enables power gating in battery-powered optical modules during idle periods. |
Applications
| Photodiode Transimpedance Amplifier | High-Speed SAR ADC Driver |
|---|---|
Use Scenario: Converting weak photocurrents from low-capacitance photodiodes (e.g., OSI FCI-125G-006) into stable voltage signals for optical power monitoring. IC Role / Device Role / Timing Role: Primary transimpedance amplifier with 20kΩ feedback resistor achieving 65MHz bandwidth and <13µVP-P 0.1Hz–10Hz noise floor. Use Value: Enables >100dB dynamic range in optical receivers by minimizing input current noise (5.5fA/√Hz) and parasitic capacitance sensitivity. | Use Scenario: Driving the input of 16-bit+ SAR ADCs (e.g., LTC2378-20) requiring fast settling, low distortion, and wide bandwidth. IC Role / Device Role / Timing Role: Unity-gain buffer with 350MHz –3dB bandwidth and 17ns 0.1% settling time for 3.5V step transitions. Use Value: Delivers –100dB THD+N at 1MHz, ensuring no degradation of effective number of bits (ENOB) in precision data acquisition systems. |
| CCD Output Buffer | Photomultiplier Tube Post-Amplifier |
Use Scenario: Conditioning analog video outputs from scientific-grade CCD image sensors with high output impedance and low signal amplitude. IC Role / Device Role / Timing Role: Low-noise, high-slew-rate buffer isolating CCD pixel clock feedthrough and preserving signal integrity across 10–50MHz bandwidth. Use Value: 400V/µs slew rate and 4.3nV/√Hz noise ensure minimal smearing and SNR loss in high-frame-rate imaging pipelines. | Use Scenario: Amplifying microampere-level pulses from photomultiplier tubes in radiation detection or fluorescence lifetime systems. IC Role / Device Role / Timing Role: Fast, low-bias-current post-amplifier with 21MHz full-power bandwidth supporting pulse widths down to ~15ns. Use Value: 450fF input capacitance and ±3fA bias current prevent pulse amplitude droop and baseline shift in time-critical PMT signal chains. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low bias current op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4817-1ARMZ | Higher input bias current (2pA max), lower GBW (1GHz), higher supply current (18mA), no shutdown pin. | Better suited for general-purpose high-speed buffering where fA-level bias isn't required; lacks integrated shutdown. | Select when >100MHz bandwidth is prioritized over femtoampere input leakage and power gating capability. |
| OPA858IDSGT | Lower input bias current (0.5fA typ.), higher GBW (5.5GHz), higher supply current (24mA), different SO-8 pinout (no NC guard pins). | Optimized for RF/IF TIAs with GHz-range bandwidth; not pin-compatible and lacks guard-ring layout support. | Select for >500MHz closed-loop bandwidth needs where PCB leakage is mitigated by layout, not guard rings. |
Compared with ADA4817-1ARMZ and OPA858IDSGT, the LTC6268IS8#TRPBF uniquely combines femtoampere input bias, SO-8 guard-ring terminals, and integrated shutdown-making it the only choice for leakage-critical, power-aware, medium-bandwidth optical front-ends.
Availability
LTC6268IS8#TRPBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, high-speed SAR ADC drivers, and CCD output buffers requiring stable component supply across industrial temperature ranges (–40°C to 125°C).
Supply support for LTC6268IS8#TRPBF 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
Analog Devices, Inc. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, formed through the acquisition of Linear Technology in 2017.
The LTC6268 product line was designed specifically for ultra-low input bias current, high-speed precision signal conditioning in optical, scientific, and medical instrumentation where femtoampere-level leakage and sub-picofarad input capacitance are mandatory.
FAQ
What is the maximum operating temperature specification for the LTC6268IS8#TRPBF?
The LTC6268IS8#TRPBF is rated for operation from –40°C to 125°C (H-grade), with all electrical specifications guaranteed across this extended industrial temperature range. Its junction temperature must not exceed 150°C, and thermal resistance θJA is 120°C/W for the SO-8 package under standard PCB conditions.
Does the LTC6268IS8#TRPBF support single-supply operation?
Yes, the LTC6268IS8#TRPBF supports true single-supply operation from 3.1V to 5.25V. Its input common-mode range extends from V– (typically 0V) to V+ – 0.5V, and its rail-to-rail output delivers full swing from V– to V+, enabling direct interfacing with 3.3V or 5V ADC references without level-shifting circuitry.
How does the guard ring functionality work on the LTC6268IS8#TRPBF SO-8 package?
The LTC6268IS8#TRPBF SO-8 package includes two unconnected pins (Pin 5 and Pin 8) explicitly designated for guard ring routing. When tied together and driven to the same potential as the +IN/–IN common-mode voltage (e.g., via a unity-gain buffer), they surround the sensitive input traces to divert PCB surface leakage currents away from the amplifier inputs-reducing effective input bias current in humid or contaminated environments.
What is the typical input voltage noise density of the LTC6268IS8#TRPBF at 1MHz?
The typical input voltage noise density of the LTC6268IS8#TRPBF is 4.3nV/√Hz at 1MHz and VCM = 2.75V. This value increases slightly to 4.9nV/√Hz at VCM = 4.0V due to process-dependent channel noise contributions, and is specified over the full –40°C to 125°C temperature range.
Can the LTC6268IS8#TRPBF drive heavy capacitive loads without instability?
The LTC6268IS8#TRPBF is not unity-gain stable into arbitrary capacitive loads. For loads >10pF, external compensation (e.g., series R + small C at output) or feedback network adjustment is required. The datasheet specifies performance with CL = 10pF; stability margins degrade above this value unless compensated per Application Note AN149 and Figure 12's layout guidelines.
LTC6268IS8#TRPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 400V/µs
- Gain Bandwidth Product:
- 500 MHz
- -3db Bandwidth:
- 350 MHz
- Current - Input Bias:
- 0.9 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 16.5mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 3.1 V
- Voltage - Supply Span (Max):
- 5.25 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LTC6268IS8#TRPBF FAQ
1.How can I place an order for LTC6268IS8#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6268IS8#TRPBF 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 LTC6268IS8#TRPBF reliable?
The price and inventory of LTC6268IS8#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6268IS8#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6268IS8#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6268IS8#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6268IS8#TRPBF?
LTC6268IS8#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6268IS8#TRPBF 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 LTC6268IS8#TRPBF?
For technical support, including LTC6268IS8#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6268IS8#TRPBF requirements.
6.How does Aetrix verify that LTC6268IS8#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6268IS8#TRPBF 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 LTC6268IS8#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6268IS8#TRPBF?
All LTC6268IS8#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6268IS8#TRPBF, 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 LTC6268IS8#TRPBF part is unused and in its original packaging.
Return procedure for LTC6268IS8#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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