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Analog Devices Inc. LTC6268IS8-10#TRPBF
- Part No.:
- LTC6268IS8-10#TRPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LTC6268IS8-10#TRPBF.pdf
- Description:
- IC OPAMP JFET 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,794
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Product details
Overview
LTC6268IS8-10#TRPBF from Analog Devices (formerly Linear Technology) is a single-channel, decompensated FET-input operational amplifier optimized for ultra-low input bias current (±3 fA typ. at 25°C), 0.45 pF common-mode input capacitance, and 4 GHz gain-bandwidth product. It operates from 3.1V to 5.25V, delivers rail-to-rail output swing, and is gain-of-10 stable-making it ideal for high-speed transimpedance amplifiers in photodiode and photomultiplier tube signal chains.
For engineers reviewing the LTC6268IS8-10#TRPBF datasheet, LTC6268IS8-10#TRPBF pinout, LTC6268IS8-10#TRPBF application, or LTC6268IS8-10#TRPBF equivalent, key selection criteria include femtoamp-level input bias current stability over temperature, sub-0.5 pF input capacitance for TIA bandwidth optimization, shutdown functionality with 360 ns turn-on time, and SOIC-8 packaging with guard-ring-capable NC pins.
Technical Context
The LTC6268IS8-10#TRPBF employs a CMOS input buffer stage that bootstraps protection diodes to suppress leakage, enabling ±3 fA typical input bias current. Its complementary differential input stage covers full input common-mode range (–0.1 V to 4.5 V on 5 V supply) while maintaining low voltage noise (4.0 nV/√Hz at 1 MHz) and ultra-low current noise (7 fA/√Hz at 100 kHz).
As a decompensated op amp, it requires minimum closed-loop gain of 10 for stability and achieves 210 MHz transimpedance bandwidth with 20 kΩ feedback. Its rail-to-rail output uses common-emitter topology, delivering +1500 V/µs slew rate (positive edge) and –1000 V/µs (negative edge) into 500 Ω loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 4 GHz - Enables stable 210 MHz transimpedance bandwidth with 20 kΩ RF and minimal CF compensation. |
| Input Bias Current | ±3 fA typ. at 25°C - Critical for femtoamp photocurrent measurement without signal corruption. |
| Input Capacitance | 0.45 pF common-mode - Minimizes pole formation with feedback resistor, preserving TIA bandwidth. |
| Slew Rate | +1500 V/µs / –1000 V/µs - Supports fast large-signal settling in pulse-amplification applications. |
| Supply Range | 3.1 V to 5.25 V - Compatible with standard 3.3 V and 5 V systems; supports split-supply operation. |
| Shutdown Current | 0.39 mA max - Reduces quiescent power by >97% during idle periods in battery-sensitive designs. |
| Operating Temp | –40°C to 125°C - Qualified for industrial and automotive under-hood sensor front-ends. |
Pinout & Package
The LTC6268IS8-10#TRPBF is housed in an 8-lead plastic SOIC (S8) package with two unconnected pins (Pin 5 and Pin 8) usable as guard rings to mitigate PCB surface leakage-critical for femtoamp signal integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (SHDN) | Active-low shutdown control | Drives amplifier into high-Z output state when pulled ≤0.75 V; enables fast 360 ns wake-up. |
| 2 (V+) | Positive supply rail | Accepts 3.1 V to 5.25 V; requires local 0.1 µF bypass capacitor for high-frequency PSRR. |
| 3 (OUT) | Amplifier output | Rail-to-rail capable; drives 10 mA load within 200 mV of rails; supports 135 mA short-circuit peak. |
| 4 (V–) | Negative supply rail | Typically grounded; supports split supplies if total V+–V– remains within 3.1 V–5.25 V range. |
| 5 (NC) | No connect | Guard ring candidate-tied to low-impedance ground plane to shield inverting input from board leakage. |
| 6 (–IN) | Inverting input | 0.45 pF common-mode capacitance; input voltage range extends to V– and up to V+ – 0.5 V. |
| 7 (+IN) | Non-inverting input | Matches –IN specs; differential input capacitance is only 0.1 pF (DC to 200 MHz). |
| 8 (NC) | No connect | Second guard ring option-used with Pin 5 to encircle both inputs in ultra-high-impedance layouts. |
Key Features
| Feature | Design Value |
|---|---|
| Femtoamp input bias current | ±3 fA typ. at 25°C ensures <1 µV error across 1 GΩ source impedance-enabling direct photodiode connection. |
| Sub-0.5 pF input capacitance | 0.45 pF common-mode capacitance minimizes feedback pole frequency degradation in TIAs. |
| Gain-of-10 stability | Decompensated architecture allows 4 GHz GBW while maintaining phase margin ≥45° at AV = 10. |
| Rail-to-rail output | Swings within 200 mV of either rail at 10 mA load-maximizes dynamic range in single-supply 3.3 V/5 V systems. |
| Integrated shutdown | 360 ns turn-on / 183 ns turn-off enables microsecond-scale power gating in pulsed-sensing applications. |
Applications
| Photodiode Transimpedance Amplifier | Photomultiplier Tube Post-Amplifier |
|---|---|
Use Scenario: Converting weak photocurrents (fA–nA) from silicon PIN or avalanche photodiodes into measurable voltage signals. IC Role / Device Role / Timing Role: Primary transimpedance amplifier with 20 kΩ–402 kΩ feedback resistors; sets system bandwidth and noise floor. Use Value: 0.45 pF input capacitance and ±3 fA bias current enable >210 MHz bandwidth at 20 kΩ gain while suppressing dark-current-induced offset drift. | Use Scenario: Amplifying fast, low-current pulses (ns rise time) from photomultiplier tubes used in radiation detection and time-of-flight mass spectrometry. IC Role / Device Role / Timing Role: High-speed post-amplifier following PMT anode; preserves pulse fidelity and timing resolution. Use Value: +1500 V/µs slew rate and 4 GHz GBW support sub-10 ns pulse response; rail-to-rail output maximizes ADC input utilization. |
| Low-IBIAS Sensor Interface | High-Speed ADC Driver |
Use Scenario: Interfacing ultra-high-impedance chemical or biological sensors (e.g., ion-selective electrodes, DNA sequencers) where leakage must be <1 fA. IC Role / Device Role / Timing Role: Front-end buffer isolating sensor node from downstream circuitry; maintains DC accuracy and low-frequency stability. Use Value: Guard-ring-capable SOIC-8 package (Pins 5 & 8) and 0.1 pF differential CIN prevent board-level leakage from corrupting fA-level measurements. | Use Scenario: Driving high-resolution, high-speed SAR or pipeline ADCs requiring wide bandwidth, low distortion, and precise settling. IC Role / Device Role / Timing Role: Buffer and level-shifter between signal source and ADC input; manages charge injection and back-driving. Use Value: –91 dB HD2/–96 dB HD3 at 10 MHz (2 VP-P) ensures <16-bit ENOB; 73 MHz full-power bandwidth supports 10 MSPS+ sampling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-bias-current, high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4817-1ARMZ-R7 | Lower GBW (1 GHz), higher input bias current (2 pA), no shutdown, SOT-23-6 package | Not suitable for >100 MHz TIA designs or fA-level precision; lacks guard-ring capability | Select when cost sensitivity outweighs femtoamp performance and layout complexity is constrained. |
| LTC6268HS8-10#TRPBF | Identical electrical specs but rated for –40°C to 125°C (vs. –40°C to 85°C for I-grade) | Same functional use; differs only in extended temperature qualification and part marking (H vs. I) | Choose for automotive or industrial environments exceeding 85°C ambient. |
Compared with ADA4817-1ARMZ-R7 and LTC6268HS8-10#TRPBF, the LTC6268IS8-10#TRPBF uniquely balances 4 GHz bandwidth, ±3 fA bias current, and SOIC-8 guard-ring flexibility for production-ready, high-fidelity photodetection front-ends operating up to 85°C.
Availability
LTC6268IS8-10#TRPBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, photomultiplier tube post-amplifiers, and low-IBIAS sensor interfaces requiring stable component supply across industrial, test & measurement, and medical OEM programs.
Supply support for LTC6268IS8-10#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 family was designed specifically for ultra-low-noise, ultra-low-input-bias-current applications in optical sensing, scientific instrumentation, and precision metrology-where femtoamp leakage and sub-picofarad capacitance directly determine system resolution.
FAQ
What is the maximum operating temperature for the LTC6268IS8-10#TRPBF?
The LTC6268IS8-10#TRPBF is specified for operation from –40°C to +85°C ambient temperature. Its junction temperature must not exceed 150°C, and thermal resistance (θJA) is 120°C/W for the SOIC-8 package. Derating is required above 85°C ambient unless heatsinking or airflow is applied per the Absolute Maximum Ratings table.
Does the LTC6268IS8-10#TRPBF require external compensation for stability?
Yes-the LTC6268IS8-10#TRPBF is a decompensated op amp and is only stable for closed-loop gains ≥10. For transimpedance amplifier configurations, a small feedback capacitor (CF) must be added in parallel with RF to ensure adequate phase margin; minimum CF values depend on RF and total input capacitance (CIN), as detailed in the Applications Information section.
Can the NC pins (5 and 8) on the LTC6268IS8-10#TRPBF be left floating?
No-while Pins 5 and 8 are internally unconnected, they are intended for guard-ring implementation. Leaving them floating increases susceptibility to board leakage currents. For optimal femtoamp performance, tie both NC pins to a clean, low-impedance ground plane surrounding the input traces to shield the –IN and +IN nodes.
What is the typical input offset voltage drift of the LTC6268IS8-10#TRPBF?
The LTC6268IS8-10#TRPBF has a typical input offset voltage drift of 4 µV/°C, measured at VCM = 2.75 V. This low drift ensures minimal DC error accumulation over temperature in precision DC-coupled sensor interfaces, especially when combined with its ±3 fA input bias current.
How does the shutdown feature affect output behavior in the LTC6268IS8-10#TRPBF?
When SHDN (Pin 1) is pulled ≤0.75 V, the LTC6268IS8-10#TRPBF disables its output stage and places OUT (Pin 3) in high-impedance state within 183 ns. Output leakage in shutdown is ≤400 nA, preserving signal integrity in multiplexed or shared-bus architectures. The amplifier fully re-enables in 360 ns when SHDN rises above 1.5 V.
LTC6268IS8-10#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:
- 1500V/µs
- Gain Bandwidth Product:
- 4 GHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 0.003 pA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 16.5mA
- Current - Output / Channel:
- 90 mA
- 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
LTC6268IS8-10#TRPBF FAQ
1.How can I place an order for LTC6268IS8-10#TRPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6268IS8-10#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 LTC6268IS8-10#TRPBF reliable?
The price and inventory of LTC6268IS8-10#TRPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6268IS8-10#TRPBF is usually 5 days.
3.What payment methods are accepted for LTC6268IS8-10#TRPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6268IS8-10#TRPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6268IS8-10#TRPBF?
LTC6268IS8-10#TRPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6268IS8-10#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 LTC6268IS8-10#TRPBF?
For technical support, including LTC6268IS8-10#TRPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6268IS8-10#TRPBF requirements.
6.How does Aetrix verify that LTC6268IS8-10#TRPBF is sourced from the original manufacturer or authorized distributors?
All LTC6268IS8-10#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 LTC6268IS8-10#TRPBF meets industry standards.
7.What is the process for return or replacement of LTC6268IS8-10#TRPBF?
All LTC6268IS8-10#TRPBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6268IS8-10#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 LTC6268IS8-10#TRPBF part is unused and in its original packaging.
Return procedure for LTC6268IS8-10#TRPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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