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Analog Devices Inc. LTC6269IMS8E-10#PBF
- Part No.:
- LTC6269IMS8E-10#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Datasheet:
-
LTC6269IMS8E-10#PBF.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,128
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Product details
Overview
LTC6269IMS8E-10#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, decompensated, gain-of-10 stable 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 used in high-speed transimpedance amplifiers for photodiode and photomultiplier tube signal conditioning.
For engineers reviewing the LTC6269IMS8E-10#PBF datasheet, LTC6269IMS8E-10#PBF pinout, LTC6269IMS8E-10#PBF application, or LTC6269IMS8E-10#PBF 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 MSOP-8 package compatibility with guard-ring layout techniques.
Technical Context
The LTC6269IMS8E-10#PBF employs a CMOS input buffer stage that bootstraps protection diodes to minimize leakage, enabling ±3 fA typical input bias current. Its complementary input stage covers full input common-mode range (–0.1 V to 4.5 V on 5 V supply) and supports rail-to-rail output via common-emitter output transistors.
This dual op amp uses decompensated architecture requiring minimum closed-loop gain of 10 for stability. Its noise performance combines 4.0 nV/√Hz voltage noise at 1 MHz and 7 fA/√Hz current noise at 100 kHz, with input-referred 0.1 Hz–10 Hz noise of 12.6 µVP-P, making it suitable for low-noise, high-impedance sensor interfaces where both voltage and current noise must be minimized simultaneously.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 4 GHz - enables stable operation in high-gain, high-frequency transimpedance configurations up to 210 MHz with 20 kΩ feedback. |
| Input Bias Current | ±3 fA typ. at 25°C - preserves signal integrity in femtoamp-level photodiode and ion-sensor applications without measurable DC error. |
| Input Capacitance | 0.45 pF common-mode - minimizes pole formation with feedback resistors, directly extending usable TIA bandwidth. |
| Slew Rate | +1500 V/µs / –1000 V/µs - supports fast transient response in pulsed optical detection systems with minimal settling distortion. |
| Supply Range | 3.1 V to 5.25 V - compatible with standard 3.3 V and 5 V system rails while maintaining specified AC/DC performance. |
| Operating Temp | –40°C to 85°C - qualified for industrial and instrumentation environments without derating of bias current or noise specs. |
| Shutdown Current | 0.85 mA max per amplifier - reduces power by >95% during idle periods in battery-powered or duty-cycled optical receivers. |
Pinout & Package
The LTC6269IMS8E-10#PBF is housed in an 8-lead plastic MSOP package with exposed pad (pin 9 connected to V–). The exposed pad improves thermal dissipation (θJA = 40°C/W) and must be soldered to PCB ground for optimal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUTA) | Amplifier A output | Rail-to-rail capable; drives 25 mA sink/source; requires local 0.1 µF bypass to V–. |
| 2 (–INA) | Inverting input A | 0.45 pF common-mode capacitance; voltage range: V– to V+ – 0.5 V; guard ring layout recommended. |
| 3 (+INA) | Non-inverting input A | Matched to –INA for CMRR >64 dB; same voltage range and leakage specs as –INA. |
| 4 (V–) | Negative supply | Reference for both amplifiers; exposed pad (pin 9) is internally connected to V–. |
| 5 (V+) | Positive supply | Accepts 3.1 V–5.25 V; requires 0.1 µF ceramic bypass capacitor placed adjacent to pin. |
| 6 (OUTB) | Amplifier B output | Independent rail-to-rail output; identical AC/DC specs to OUTA; no crosstalk specification given. |
| 7 (–INB) | Inverting input B | Electrically identical to –INA; dual-channel isolation enables differential TIA or independent sensor channels. |
| 8 (+INB) | Non-inverting input B | Matched to –INB; supports independent biasing or common-mode rejection configurations. |
Key Features
| Feature | Design Value |
|---|---|
| Femtoamp input bias current | ±3 fA typ. at 25°C ensures <1 µV offset error across 1 GΩ feedback resistors in precision photodiode amps. |
| 0.45 pF input capacitance | Minimizes dominant pole with feedback networks, enabling >200 MHz closed-loop bandwidth in 20 kΩ TIAs. |
| Gain-of-10 stability | Allows use in high-gain transimpedance configurations without external compensation capacitors. |
| Rail-to-rail output | Delivers full dynamic range from V– to V+ – 200 mV (at 25 mA load), maximizing SNR in single-supply systems. |
| Active shutdown | Reduces quiescent current to ≤0.85 mA per channel with 360 ns wake-up, supporting low-duty-cycle optical burst-mode receivers. |
Applications
| Photodiode Transimpedance Amplifier | Photomultiplier Tube Post-Amplifier |
|---|---|
Use Scenario: Converting weak photocurrents (100 fA–10 µA) from silicon or InGaAs photodiodes into measurable voltage signals in optical communications and spectroscopy. IC Role / Device Role / Timing Role: Primary transimpedance gain stage with ultra-low input capacitance and bias current to preserve bandwidth and DC accuracy. Use Value: Enables 210 MHz bandwidth with 20 kΩ feedback resistor and maintains <0.1% gain error at 100 kΩ due to <0.45 pF CIN. | Use Scenario: Amplifying fast, low-current pulses (ns rise time) from photomultiplier tubes in radiation detection, mass spectrometry, and fluorescence lifetime imaging. IC Role / Device Role / Timing Role: High-speed post-amplifier following PMT anode output, requiring low noise, high slew rate, and minimal added jitter. Use Value: +1500 V/µs slew rate and 4 GHz GBW support sub-5 ns pulse fidelity; 7 fA/√Hz current noise avoids degradation of PMT's inherent signal-to-noise ratio. |
| Low-IBIAS Sensor Interface | ADC Driver for High-Resolution Sampling |
Use Scenario: Conditioning ultra-high-impedance outputs from ion-selective electrodes, pH sensors, or MEMS-based chemical detectors operating in humid or high-temperature environments. IC Role / Device Role / Timing Role: Front-end buffer isolating picoamp-level sensor currents from PCB leakage and ADC input loading. Use Value: ±3 fA input bias current prevents >10 mV offset drift across 10 GΩ electrode impedances; guard-ring-compatible MSOP-8 layout suppresses board surface leakage. | Use Scenario: Driving SAR or sigma-delta ADC inputs in precision data acquisition systems requiring low THD, fast settling, and wide bandwidth. IC Role / Device Role / Timing Role: Unity-gain stable buffer (in composite configuration) or gain-stage driver ensuring full-scale step settling within 12-bit accuracy. Use Value: –91 dB HD2/–96 dB HD3 at 10 MHz and 2 VP-P enables >10 ENOB at 10 MSPS; rail-to-rail output matches ADC reference span without level-shifting. |
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 |
|---|---|---|---|
| LTC6268IS8-10#PBF | Single-channel version in SO-8; identical GBW, bias current, and noise specs; lacks second amplifier channel. | Used when only one high-speed TIA channel is needed; SO-8 allows guard-ring implementation via NC pins. | Select when space or cost constraints favor single-channel operation and SO-8 layout flexibility is preferred over MSOP density. |
| ADA4817-2ARMZ | 2.1 GHz GBW; 2.5 fA bias current (typ); higher 4.9 nV/√Hz voltage noise; no shutdown pin; 8-lead MSOP package. | Lower bandwidth limits TIA gain-bandwidth tradeoff; higher voltage noise degrades SNR in low-RF configurations. | Choose when femtoamp bias current is critical but 4 GHz GBW is not required, and shutdown functionality is unnecessary. |
Compared with LTC6269IMS8E-10#PBF, LTC6268IS8-10#PBF offers identical performance per channel in a larger package with guard-ring capability, while ADA4817-2ARMZ trades 43% lower bandwidth and higher voltage noise for marginally lower bias current-making LTC6269IMS8E-10#PBF optimal for bandwidth-constrained, multi-channel, low-power TIA designs.
Availability
LTC6269IMS8E-10#PBF 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 optical subsystem programs.
Supply support for LTC6269IMS8E-10#PBF 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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, communications, and industrial applications.
The LTC6269 belongs to Linear Technology's ultra-low-input-bias-current op amp family, designed specifically for high-impedance, high-speed signal conditioning in optical sensing, scientific instrumentation, and analytical chemistry systems.
FAQ
What is the maximum operating temperature range for the LTC6269IMS8E-10#PBF?
The LTC6269IMS8E-10#PBF is specified for operation from –40°C to +85°C. This industrial-grade temperature range is confirmed in the "ORDER INFORMATION" table and electrical characteristics sections of the official datasheet, where the "I" grade (e.g., LTC6269IMS8E-10#PBF) explicitly denotes the –40°C to 85°C range, distinct from the "H" grade rated to 125°C.
Does the LTC6269IMS8E-10#PBF require external compensation for stability?
No, the LTC6269IMS8E-10#PBF is decompensated but gain-of-10 stable, meaning it remains stable in closed-loop configurations with noise gain ≥10. External compensation is not required for standard transimpedance amplifier designs using ≥10 kΩ feedback resistors; however, feedback capacitance (CF) may be needed to dampen peaking caused by photodiode junction capacitance interacting with the op amp's 0.45 pF input capacitance.
How is the exposed pad on the LTC6269IMS8E-10#PBF configured?
The exposed pad (pin 9) on the LTC6269IMS8E-10#PBF is internally connected to V– and must be soldered to a PCB ground plane. Per the "PIN CONFIGURATION" diagram and Absolute Maximum Ratings table, this connection is mandatory for thermal performance (θJA = 40°C/W) and electrical stability; floating or unconnected exposed pads will degrade thermal resistance and may cause parametric shift or reliability issues.
Can the LTC6269IMS8E-10#PBF drive heavy capacitive loads?
The LTC6269IMS8E-10#PBF is not optimized for direct heavy capacitive loading (>100 pF). Its output impedance rises above 1 MHz (see Figure 626810 G22), and driving large capacitive loads without isolation resistance can induce instability or ringing. For capacitive loads >50 pF, a series resistor (10–100 Ω) between output and load is recommended to maintain phase margin and prevent oscillation.
What is the input voltage range specification for the LTC6269IMS8E-10#PBF?
The LTC6269IMS8E-10#PBF has an input voltage range guaranteed by CMRR from –0.1 V to 4.5 V on a 5 V supply (V+ = 5 V, V– = 0 V), and from –0.1 V to 2.8 V on a 3.3 V supply. This is explicitly stated in the "ELECTRICAL CHARACTERISTICS" tables under "IVR (Input Voltage Range)" and applies across the full operating temperature range (–40°C to 85°C).
LTC6269IMS8E-10#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) Exposed Pad
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- J-FET
- Number of Circuits:
- 2
- Output Type:
- -
- 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 (x2 Channels)
- 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-MSOP-EP
LTC6269IMS8E-10#PBF FAQ
1.How can I place an order for LTC6269IMS8E-10#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6269IMS8E-10#PBF 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 LTC6269IMS8E-10#PBF reliable?
The price and inventory of LTC6269IMS8E-10#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LTC6269IMS8E-10#PBF is usually 5 days.
3.What payment methods are accepted for LTC6269IMS8E-10#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6269IMS8E-10#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6269IMS8E-10#PBF?
LTC6269IMS8E-10#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6269IMS8E-10#PBF 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 LTC6269IMS8E-10#PBF?
For technical support, including LTC6269IMS8E-10#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6269IMS8E-10#PBF requirements.
6.How does Aetrix verify that LTC6269IMS8E-10#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6269IMS8E-10#PBF 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 LTC6269IMS8E-10#PBF meets industry standards.
7.What is the process for return or replacement of LTC6269IMS8E-10#PBF?
All LTC6269IMS8E-10#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6269IMS8E-10#PBF, 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 LTC6269IMS8E-10#PBF part is unused and in its original packaging.
Return procedure for LTC6269IMS8E-10#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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