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Analog Devices Inc. LTC6269IDD-10#PBF
- Part No.:
- LTC6269IDD-10#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LTC6269IDD-10#PBF.pdf
- Description:
- IC OPAMP JFET 2 CIRCUIT 10DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,147
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Product details
Overview
LTC6269IDD-10#PBF from Analog Devices (formerly Linear Technology) is a dual-channel, decompensated FET-input operational amplifier optimized for ultra-low input bias current (±3 fA typ. at 25°C), 4 GHz gain-bandwidth product, and 0.45 pF common-mode input capacitance. It operates from 3.1V to 5.25V, delivers rail-to-rail output swing, and features active shutdown - making it ideal for high-speed transimpedance amplifiers in photodiode-based optical receivers and low-leakage sensor front-ends.
For engineers reviewing the LTC6269IDD-10#PBF datasheet, LTC6269IDD-10#PBF pinout, LTC6269IDD-10#PBF application, or LTC6269IDD-10#PBF equivalent, key selection criteria include femtoamp-level input bias stability over temperature, gain-of-10 minimum stability requirement, 10-lead DFN package thermal performance (θJA = 43°C/W), and verified 210 MHz transimpedance bandwidth with 20 kΩ feedback.
Technical Context
The LTC6269IDD-10#PBF employs a CMOS input buffer stage that bootstraps protection diodes to suppress leakage, enabling its ±3 fA typical input bias current. Its complementary input stage covers full input voltage range (V– to V+ – 0.5 V) while maintaining low input capacitance via differential and common-mode capacitance separation (0.1 pF diff / 0.45 pF cm).
This dual op amp uses a cascode topology with rail-to-rail output stage (Q1/Q2 common-emitter configuration) and internal compensation tailored for AV ≥ 10 stability. Its 4 GHz GBW and ±1500 V/µs slew rate support fast settling in high-gain TIA configurations where noise gain peaking must be controlled by precise CF selection per CIN/CF ≥ 10 ratio.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 4 GHz - enables stable 210 MHz transimpedance bandwidth with 20 kΩ RF and 1 pF total CIN. |
| Input Bias Current | ±3 fA typ. at 25°C - preserves signal integrity in femtoamp photodiode or ion-sensor applications. |
| Input Capacitance | 0.45 pF common-mode - minimizes noise gain peaking and stabilizes high-RF TIAs without excessive CF. |
| Slew Rate | +1500 V/µs / –1000 V/µs - supports fast large-signal settling in pulsed optical detection circuits. |
| Supply Range | 3.1 V to 5.25 V - compatible with standard 3.3 V and 5 V systems; split-supply operation permitted. |
| Operating Temp | –40°C to 85°C - qualified for industrial-grade embedded optical sensing and test equipment. |
| Shutdown Current | 0.39 mA max per amplifier - reduces power to <1% of active quiescent current (16.5 mA) during idle periods. |
Pinout & Package
The LTC6269IDD-10#PBF is housed in a 10-lead (3 mm × 3 mm) plastic DFN package with exposed V– pad (Pin 11, soldered to PCB ground plane). Thermal resistance θJA = 43°C/W enables high-power-density layout in compact optical modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | +INA, –INA, OUTA, V– | Channel A non-inverting input, inverting input, output, and negative supply - forms first independent amplifier section. |
| 5, 6, 7, 8 | V+, OUTB, –INB, +INB | Positive supply, Channel B output, inverting input, and non-inverting input - second independent amplifier with identical specs. |
| 9, 10 | SDB, SDA | Active-low shutdown controls for Channel B and Channel A - each disables respective amplifier when pulled ≤0.75 V relative to V–. |
| 11 | Exposed Pad | Internally connected to V– - must be soldered to PCB ground plane for thermal and electrical performance. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail output swing | Delivers full dynamic range into 1 kΩ loads with <200 mV saturation at ±25 mA, critical for ADC driver headroom. |
| Ultra-low input current noise | 7 fA/√Hz at 100 kHz - dominates total input-referred noise in high-RF TIAs above ~100 kHz. |
| Low voltage noise density | 4.0 nV/√Hz at 1 MHz - ensures minimal contribution to wideband TIA noise floor when RF < 860 Ω. |
| Gain-of-10 stability | Decompensated architecture eliminates need for external compensation in AV ≥ 10 configurations, simplifying layout. |
| Independent shutdown control | Dual SHDN pins (SDA/SDB) allow per-channel power gating - essential for multi-channel optical receivers with burst-mode operation. |
Applications
| Photodiode Transimpedance Amplifier | High-Speed ADC Driver |
|---|---|
Use Scenario: Converting photocurrent from low-capacitance silicon photodiodes (e.g., OSI FCI-125G-006) into voltage signals for digitization in optical time-domain reflectometers. IC Role / Device Role / Timing Role: Dual-channel TIA core with 20 kΩ RF achieving 210 MHz bandwidth and <1% harmonic distortion at 10 MHz. Use Value: Enables 4.7 ns pulse resolution in fiber fault location while maintaining ±3 fA input bias for sub-picoamp dark current rejection. | Use Scenario: Driving 12-bit, 105 MSPS SAR ADC inputs in portable laser rangefinders requiring low THD and fast settling. IC Role / Device Role / Timing Role: Single-ended to differential converter and gain stage with 4 GHz GBW ensuring <0.1 LSB error at full-scale step transitions. Use Value: Delivers –91 dB HD2/–96 dB HD3 at 10 MHz, preserving ENOB in high-frequency sampling paths without external filtering. |
| Photomultiplier Tube Post-Amplifier | Low IBias Precision Sensor Interface |
Use Scenario: Amplifying nanosecond-scale anode pulses from PMTs in radiation detection systems operating at –40°C to 85°C ambient. IC Role / Device Role / Timing Role: Fast-settling post-amplifier with 1500 V/µs slew rate and 360 ns turn-on time after shutdown activation. Use Value: Captures single-photon events with <10 ps jitter contribution and maintains <4 pA max IBias at 125°C for long-term calibration stability. | Use Scenario: Front-end conditioning for electrochemical sensors (e.g., pH, ion-selective electrodes) where leakage currents must remain below 10 fA. IC Role / Device Role / Timing Role: Ultra-high-impedance buffer with >1000 GΩ input resistance and guard-ring-compatible SOIC variant (not this DFN). Use Value: Prevents measurement drift in humid environments via 0.45 pF CIN and CMOS input architecture that minimizes surface leakage coupling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual FET-input op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4817-2ARMZ | Lower GBW (1 GHz), higher IBias (2 pA typ.), no shutdown, 8-lead MSOP | Not suitable for fA-level photodiode TIAs; better for general-purpose high-speed buffering | Select when 1 GHz bandwidth suffices and shutdown is unnecessary |
| LTC6268IS8-10#PBF | Single-channel, 8-lead SOIC, includes two NC pins usable as guard ring | Requires separate devices for dual-channel use; larger footprint but superior board leakage mitigation | Select when board-level leakage control is prioritized over space-constrained layouts |
Compared with ADA4817-2ARMZ and LTC6268IS8-10#PBF, the LTC6269IDD-10#PBF uniquely combines dual-channel integration, femtoamp bias, 4 GHz bandwidth, and per-channel shutdown in a thermally efficient 3 mm × 3 mm DFN - making it the only option for space-constrained, low-noise, multi-channel optical front-ends.
Availability
LTC6269IDD-10#PBF is available at Aetrix Electronics and suitable for photodiode transimpedance amplifiers, high-speed ADC drivers, photomultiplier tube post-amplifiers, and low IBias precision sensor interfaces requiring stable component supply across industrial temperature ranges.
Supply support for LTC6269IDD-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. (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, acquired Linear Technology in 2017 to expand precision amplifier and power management portfolios.
The LTC6269 series belongs to ADI's ultra-low bias current op amp product line, designed specifically for optical sensing, scientific instrumentation, and high-impedance measurement systems where femtoamp leakage and GHz bandwidth are simultaneously required.
FAQ
What is the minimum stable gain for LTC6269IDD-10#PBF?
The LTC6269IDD-10#PBF is decompensated and specified as gain-of-10 stable. It requires closed-loop gain ≥10 (AV ≥ 10) for unconditional stability. Using lower gains without external compensation risks oscillation due to phase margin erosion - confirmed in the datasheet's "Gain-Bandwidth Product" and "Stability" sections under 5 V supply conditions.
Does LTC6269IDD-10#PBF support split-supply operation?
Yes, LTC6269IDD-10#PBF supports split supplies as long as the total voltage between V+ and V– remains within 3.1 V to 5.25 V. For example, ±2.5 V (5 V total) is valid. Input common-mode range extends from V– to V+ – 0.5 V, and rail-to-rail output swing functions across the full supply range - verified in Absolute Maximum Ratings and Electrical Characteristics tables.
How does the shutdown function work on LTC6269IDD-10#PBF?
LTC6269IDD-10#PBF has two independent active-low shutdown pins: SDA controls Channel A, SDB controls Channel B. Each pin enables its amplifier when >1.5 V relative to V–, and disables it when ≤0.75 V. Shutdown reduces supply current per channel to ≤1.5 mA, and places the output in high-impedance state with 183 ns turn-off delay - detailed in the "Shutdown Pin Current" and "tOFF" specifications.
What is the maximum allowable input capacitance for stable 20 kΩ transimpedance operation with LTC6269IDD-10#PBF?
For stable 20 kΩ transimpedance operation, LTC6269IDD-10#PBF requires CF ≥ CIN/10 per design guidelines. With typical CIN = 0.45 pF (common-mode), maximum total CIN (including PCB trace and photodiode capacitance) should not exceed 5 pF to ensure CF ≥ 0.5 pF - validated in Applications Information Section "Optimizing the Bandwidth for TIA Application" and Table 1.
Is LTC6269IDD-10#PBF pin-compatible with other LTC6269 variants?
No, LTC6269IDD-10#PBF is not pin-compatible with LTC6269IMS8E-10#PBF (8-lead MSOP) or LTC6269HDD-10#PBF (same 10-lead DFN but –40°C to 125°C grade). The 10-lead DFN pinout is unique to the IDD package - confirmed by Pin Configuration diagrams showing SDA/SDB placement and exposed pad (Pin 11) connection to V–, which differs from MSOP's 8-pin layout and thermal pad assignment.
LTC6269IDD-10#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 10-WFDFN 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:
- 10-DFN (3x3)
LTC6269IDD-10#PBF FAQ
1.How can I place an order for LTC6269IDD-10#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LTC6269IDD-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 LTC6269IDD-10#PBF reliable?
The price and inventory of LTC6269IDD-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 LTC6269IDD-10#PBF is usually 5 days.
3.What payment methods are accepted for LTC6269IDD-10#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LTC6269IDD-10#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LTC6269IDD-10#PBF?
LTC6269IDD-10#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LTC6269IDD-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 LTC6269IDD-10#PBF?
For technical support, including LTC6269IDD-10#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LTC6269IDD-10#PBF requirements.
6.How does Aetrix verify that LTC6269IDD-10#PBF is sourced from the original manufacturer or authorized distributors?
All LTC6269IDD-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 LTC6269IDD-10#PBF meets industry standards.
7.What is the process for return or replacement of LTC6269IDD-10#PBF?
All LTC6269IDD-10#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LTC6269IDD-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 LTC6269IDD-10#PBF part is unused and in its original packaging.
Return procedure for LTC6269IDD-10#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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