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Analog Devices Inc. LT1809IS8#PBF
- Part No.:
- LT1809IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1809IS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:576
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Product details
Overview
LT1809IS8#PBF from Analog Devices (formerly Linear Technology) is a single, rail-to-rail input and output operational amplifier optimized for high-speed, low-distortion signal conditioning. It delivers 350 V/µs slew rate, 320 MHz –3dB bandwidth at unity gain, 180 MHz gain-bandwidth product (AV ≥ 10), and –90 dBc harmonic distortion at 5 MHz - enabling precise ADC driving and video line buffering in ±5V or single 5V systems.
For engineers reviewing the LT1809IS8#PBF datasheet, LT1809IS8#PBF pinout, LT1809IS8#PBF application, or LT1809IS8#PBF equivalent, key selection criteria include rail-to-rail swing capability (20 mV from rails), shutdown functionality, 85 mA output current, wide 2.5V–12.6V supply range, and guaranteed operation from –40°C to 85°C in the 8-lead SO package.
Technical Context
The LT1809IS8#PBF employs a complementary bipolar input stage enabling rail-to-rail common-mode input range (V– to V+) and output swing within 20 mV of either rail. Its fast-settling architecture supports 0.1% settling in 27 ns (2V step, AV = –1, RL = 500 Ω) and full-power bandwidth of 23.5 MHz at 4 VP-P output under ±5V supplies.
It integrates an active shutdown pin (SHDN) with 80 ns turn-on and 50 ns turn-off times, reducing supply current from 15–21 mA to ≤1.6 mA while maintaining high-impedance output state. Input bias current remains stable across the full common-mode range, supporting precision DC-coupled designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3dB Bandwidth | 320 MHz at AV = 1 - enables direct drive of high-speed ADCs without external compensation. |
| Slew Rate | 350 V/µs - ensures faithful reproduction of fast transient signals up to ~55 MHz fundamental. |
| Output Current | ±85 mA - drives heavy loads including 150 Ω video lines or 100 Ω transmission lines. |
| THD @ 5 MHz | –90 dBc - meets dynamic range requirements for 12-bit, 10 Msps data acquisition systems. |
| Supply Range | 2.5 V to 12.6 V - supports battery-powered, industrial, and dual-supply applications without redesign. |
| Operating Temp | –40°C to +85°C - qualified for automotive under-hood and industrial control environments. |
| Shutdown Current | ≤1.6 mA - reduces system power during idle cycles while preserving fast wake-up response. |
Pinout & Package
LT1809IS8#PBF is housed in an 8-lead plastic SO (Small Outline) package with standard op amp pinout and 1.27 mm lead pitch. The package is RoHS-compliant, lead-free, and rated for 100°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT (Pin 1) | Amplifier Output | Delivers rail-to-rail voltage swing (within 20 mV of V+ or V–) and ±85 mA sourcing/sinking capability. |
| V– (Pin 2) | Negative Supply | Reference for internal biasing; connects to ground (single supply) or negative rail (dual supply). |
| +IN (Pin 3) | Non-Inverting Input | Accepts input signals from V– to V+ with no phase reversal or damage, even when overdriven. |
| –IN (Pin 4) | Inverting Input | Differential input node; matched to +IN for low offset drift and high CMRR (89 dB typ). |
| SHDN (Pin 5) | Shutdown Control | Active-low digital input; pulls output to high-impedance state when ≤0.3 V, drawing <1 mA total. |
| V+ (Pin 6) | Positive Supply | Supports up to 12.6 V total supply; enables operation from 2.5 V single supply to ±5 V dual supply. |
| NC (Pin 7) | No Connect | Internally unused; must be left floating or tied to ground per layout best practices. |
| NC (Pin 8) | No Connect | Internally unused; no electrical function; avoid routing critical signals nearby. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables maximum dynamic range in low-voltage systems (e.g., 3.3 V or 5 V ADC front-ends) without level-shifting circuitry. |
| 350 V/µs slew rate | Preserves signal fidelity for fast edges in pulse amplification, laser diode drivers, and test equipment outputs. |
| –90 dBc THD at 5 MHz | Meets SNR requirements for 12-bit+ data converters operating at multi-MHz sampling rates. |
| Shutdown mode with 50 ns turn-off | Allows rapid power gating in portable instruments or time-multiplexed channel architectures. |
| Input common-mode range includes both rails | Eliminates need for external bias resistors in AC- or DC-coupled sensor interfaces and single-supply transimpedance amps. |
Applications
| High-Speed ADC Driver | Video Line Driver |
|---|---|
Use Scenario: Driving the analog input of a 12-bit, 10 Msps successive-approximation ADC in a medical imaging front-end. IC Role / Device Role / Timing Role: Buffer and amplify sensor output while maintaining low noise, low distortion, and fast settling to prevent aperture error. Use Value: Achieves –90 dBc THD at 5 MHz and 27 ns 0.1% settling, ensuring >70 dB SNR and accurate digitization of fast-rising pulses. | Use Scenario: Driving 75 Ω coaxial video lines in broadcast-grade SD/HD camera signal chains. IC Role / Device Role / Timing Role: Unity-gain buffer with high output current and low differential gain/phase error. Use Value: Delivers ΔG = 0.015% and Δθ = 0.05° (NTSC), preserving color fidelity and sync integrity over long cable runs. |
| Rail-to-Rail Buffer Amplifier | Low-Voltage Active Filter |
Use Scenario: Isolating and scaling output of a 3.3 V rail-to-rail DAC in a battery-powered IoT sensor node. IC Role / Device Role / Timing Role: Precision voltage follower with minimal headroom loss and low quiescent current. Use Value: Swings within 20 mV of 0 V and 3.3 V rails, maximizing usable DAC range and eliminating clipping at supply extremes. | Use Scenario: Implementing a 4th-order Sallen-Key anti-aliasing filter in a 5 V portable data logger. IC Role / Device Role / Timing Role: High-speed, low-distortion gain stage with wide GBW to maintain filter Q and cutoff accuracy. Use Value: 180 MHz GBW ensures minimal phase shift and gain error up to 10× filter cutoff frequency, preserving stopband rejection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed, rail-to-rail op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADA4897-1ARZ-R7 | Lower 1 nV/√Hz input noise, 225 MHz GBW, no shutdown pin, 105 mA IOUT. | Better for ultra-low-noise photodiode preamps; lacks power-gating capability for duty-cycled systems. | Select when noise dominates performance budget and shutdown is unnecessary. |
| OPA695IDBVR | Higher 3.5 GHz GBW, 4300 V/µs slew rate, fixed-gain stability, no rail-to-rail input. | Optimized for RF IF amplification and non-inverting gain ≥2; unsuitable for DC-coupled or single-supply rail-to-rail inputs. | Select for >100 MHz small-signal amplification where input common-mode range is not constrained. |
Compared with ADA4897-1ARZ-R7 and OPA695IDBVR, the LT1809IS8#PBF uniquely balances rail-to-rail input/output, integrated shutdown, and robust 350 V/µs slew rate across 2.5–12.6 V supplies - making it optimal for mixed-signal systems requiring flexibility, low distortion, and power-aware operation.
Availability
LT1809IS8#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, video signal routing, and low-voltage precision instrumentation requiring stable component supply, extended temperature support, and long-term manufacturing continuity.
Supply support for LT1809IS8#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 technologies, serving industrial, automotive, communications, and healthcare markets.
The LT1809IS8#PBF belongs to ADI's legacy Linear Technology high-speed op amp portfolio, designed specifically for demanding signal chain applications requiring wide bandwidth, low distortion, rail-to-rail operation, and robust shutdown control.
FAQ
What is the maximum supply voltage rating for LT1809IS8#PBF?
The LT1809IS8#PBF has an absolute maximum total supply voltage (V+ to V–) of 12.6 V. Operation beyond this rating risks permanent device damage. For reliable long-term use, Analog Devices specifies functional operation across 2.5 V to 12.6 V, with full characterization at ±5 V, +5 V, and +3 V supplies. The LT1809IS8#PBF maintains specified performance-including 350 V/µs slew rate and –90 dBc THD-at all supported supply levels.
Does LT1809IS8#PBF support true rail-to-rail input and output operation?
Yes, the LT1809IS8#PBF supports true rail-to-rail input common-mode range (V– to V+) and rail-to-rail output swing (within 20 mV of either supply rail under load). This is confirmed in the datasheet's "Features" and "Electrical Characteristics" sections, where input range is explicitly stated as "Includes Both Rails" and output swing is characterized at ISINK/ISOURCE = 25 mA. The LT1809IS8#PBF achieves this using complementary bipolar input transistors and a Class AB output stage.
What is the purpose and behavior of the SHDN pin on LT1809IS8#PBF?
The SHDN (shutdown) pin on LT1809IS8#PBF is an active-low digital control that places the amplifier in low-power standby mode. When pulled ≤0.3 V, it reduces supply current to ≤1.6 mA while forcing the output into a high-impedance state-no loading of downstream circuitry. Turn-on and turn-off times are 80 ns and 50 ns respectively. The LT1809IS8#PBF datasheet confirms this behavior across temperature and supply conditions, making it suitable for power-gated signal paths.
Can LT1809IS8#PBF drive a 150 Ω video load with low distortion?
Yes, the LT1809IS8#PBF is explicitly characterized for video line driving: at AV = 2, RL = 150 Ω, it achieves ΔG = 0.015% and Δθ = 0.05° (NTSC), confirming suitability for SD/HD video. Its ±85 mA output current and –90 dBc THD at 5 MHz ensure minimal signal degradation. The LT1809IS8#PBF maintains these metrics under ±5 V supplies, as verified in the "Typical Performance Characteristics" section (Figures G34–G36) and "Applications" list.
Is LT1809IS8#PBF pin-compatible with other op amps in the same SO-8 package?
The LT1809IS8#PBF uses the industry-standard SO-8 op amp pinout (OUT, V–, +IN, –IN, SHDN, V+, NC, NC), matching pin-for-pin layouts of many single op amps like the LT1361 or ADA4000-1. However, the SHDN pin (Pin 5) is not present on most legacy op amps; if replacing a non-shutdown device, Pin 5 must be tied to V+ to disable shutdown. The LT1809IS8#PBF datasheet confirms this configuration and warns against floating SHDN.
LT1809IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 350V/µs
- Gain Bandwidth Product:
- 180 MHz
- -3db Bandwidth:
- 320 MHz
- Current - Input Bias:
- 12.5 µA
- Voltage - Input Offset:
- 800 µV
- Current - Supply:
- 15mA
- Current - Output / Channel:
- 85 mA
- Voltage - Supply Span (Min):
- 2.5 V
- Voltage - Supply Span (Max):
- 12.6 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1809IS8#PBF FAQ
1.How can I place an order for LT1809IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1809IS8#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 LT1809IS8#PBF reliable?
The price and inventory of LT1809IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1809IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1809IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1809IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1809IS8#PBF?
LT1809IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1809IS8#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 LT1809IS8#PBF?
For technical support, including LT1809IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1809IS8#PBF requirements.
6.How does Aetrix verify that LT1809IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1809IS8#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 LT1809IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1809IS8#PBF?
All LT1809IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1809IS8#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 LT1809IS8#PBF part is unused and in its original packaging.
Return procedure for LT1809IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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