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Analog Devices Inc. LT1809CS8#PBF
- Part No.:
- LT1809CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1809CS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,672
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Product details
Overview
LT1809CS8#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 distortion at 5 MHz - enabling precision ADC driving and video line buffering in 3V to 5V systems.
For engineers reviewing the LT1809CS8#PBF datasheet, LT1809CS8#PBF pinout, LT1809CS8#PBF application, or LT1809CS8#PBF equivalent, this page provides verified package mapping (8-lead SO), confirmed shutdown functionality, rail-to-rail swing within 20 mV of rails, 85 mA output current capability, and temperature-stable performance across 0°C to 70°C.
Technical Context
The LT1809CS8#PBF employs a complementary bipolar input stage enabling rail-to-rail common-mode input range (V– to V+) and rail-to-rail output swing (within 20 mV of either rail). Its fast-settling architecture achieves 27 ns (0.1%) settling time with 2 V step and supports full-power bandwidth up to 23.5 MHz at ±5V supplies.
It integrates an active shutdown pin (SHDN) that reduces supply current to ≤1.4 mA while maintaining high-impedance output state. The device operates from 2.5 V to 12.6 V total supply, with specified performance at 3 V, 5 V, and ±5 V, and features robust input overvoltage tolerance without phase reversal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| –3dB Bandwidth | 320 MHz at AV = 1 - supports wideband signal acquisition without peaking or instability in unity-gain buffer configurations. |
| Slew Rate | 350 V/µs - enables clean reproduction of fast transient signals up to ~20 MHz full-power sine waves at ±5V. |
| Output Current | ±85 mA - drives heavy loads including 100 Ω video lines or SAR ADC input networks without gain compression. |
| THD @ 5 MHz | –90 dBc - meets dynamic range requirements for 12-bit, 10 Msps data acquisition systems. |
| Rail-to-Rail Swing | Within 20 mV of V+ and V– - maximizes usable signal headroom in low-voltage (3V/5V) applications. |
| Supply Range | 2.5 V to 12.6 V total - compatible with single-supply portable systems and dual-supply instrumentation. |
| Shutdown Current | ≤1.4 mA - enables power gating in battery-operated or multi-channel systems without external switching. |
Pinout & Package
LT1809CS8#PBF is housed in an 8-lead plastic SO (Small Outline) package with standard op amp pinout and 1.27 mm lead pitch. Thermal resistance θJA = 100°C/W under JEDEC-standard PCB layout conditions.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT) | Amplifier Output | Delivers rail-to-rail voltage swing; capable of sourcing/sinking up to ±85 mA into resistive loads. |
| 2 (V–) | Negative Supply Rail | Reference for internal biasing; connects to ground or negative supply; thermal pad attachment point. |
| 3 (+IN) | Non-Inverting Input | Accepts input signals from V– to V+ with no phase reversal; low input bias current (±10 µA max). |
| 4 (–IN) | Inverting Input | Differential input node; matched to +IN for <1.2 mV offset voltage shift across common-mode range. |
| 5 (SHDN) | Active-Low Shutdown Control | Pulls below 0.3 V to disable amplifier; draws ≤900 µA; output enters high-Z state in <50 ns. |
| 6 (NC) | No Connect | Internally unused; must be left floating or tied to ground per layout best practices. |
| 7 (V+) | Positive Supply Rail | Supplies internal circuitry; supports operation up to 12.6 V total supply; rejects ripple up to 87 dB. |
| 8 (NC) | No Connect | Internally unused; must be left floating or tied to ground per layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full utilization of supply voltage in low-voltage (3V/5V) systems, increasing dynamic range by >30% vs conventional op amps. |
| Integrated shutdown control | Reduces quiescent current to <1.4 mA while preserving output isolation - eliminates need for external MOSFET switches in power-managed designs. |
| High output drive (±85 mA) | Directly drives 100 Ω video loads or 1 kΩ ADC input RC networks without external buffers, reducing BOM count and board area. |
| Low distortion (–90 dBc @ 5 MHz) | Meets SFDR requirements for 12-bit, 10 Msps sampling systems without post-processing correction. |
| Input overvoltage tolerance | Withstands differential inputs beyond rails up to ±1.4 V without damage or phase reversal - simplifies front-end protection design. |
Applications
| High-Speed ADC Driver | Low-Voltage Video Line Driver |
|---|---|
Use Scenario: Driving the input of a 12-bit, 10 Msps SAR ADC in a portable medical sensor interface. IC Role / Device Role / Timing Role: Buffer and level-shift analog sensor output to match ADC reference range while maintaining signal integrity during fast sampling transitions. Use Value: 27 ns (0.1%) settling time and –90 dBc THD ensure accurate digitization of transients without missing codes or harmonic aliasing. | Use Scenario: Transmitting composite NTSC video signals over 75 Ω coaxial cable in embedded vision modules. IC Role / Device Role / Timing Role: Active line driver providing gain, DC restoration, and impedance matching at baseband frequencies up to 6 MHz. Use Value: 0.01% differential gain and 0.01° differential phase error preserve color fidelity; rail-to-rail swing accommodates 1 VPP video levels on 3.3 V supplies. |
| Active Filter Stage | Rail-to-Rail Signal Buffer |
Use Scenario: Implementing a 4th-order Butterworth anti-aliasing filter preceding a high-resolution delta-sigma ADC in industrial process monitoring. IC Role / Device Role / Timing Role: High-Q, low-noise gain stage with precise pole placement enabled by wide GBW and low input capacitance (2 pF). Use Value: 16 nV/√Hz input noise and 180 MHz GBW support filter corner accuracy to ±0.5% at 100 kHz without gain peaking. | Use Scenario: Isolating and scaling output of a rail-to-rail DAC in a programmable power supply controller. IC Role / Device Role / Timing Role: Unity-gain buffer with minimal loading effect and zero-phase inversion across full DAC output range. Use Value: Input common-mode range includes both rails; output swings to within 20 mV of V+ and V– - preserves full 12-bit DAC resolution without headroom loss. |
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 |
|---|---|---|---|
| ADA4897-1ARJZ-R7 | Lower noise (1 nV/√Hz), lower supply current (11 mA), but only 200 MHz GBW and no shutdown pin. | Better suited for ultra-low-noise preamp stages; lacks power-gating capability required in duty-cycled systems. | Select when noise dominates over power and shutdown is unnecessary; not drop-in due to missing SHDN and different pinout. |
| OPA837IDBVR | Higher slew rate (560 V/µs), wider supply range (2.7–5.4 V), but no rail-to-rail input and no shutdown function. | Optimized for single-supply 3.3 V systems with aggressive transient response; cannot accept inputs near V–. | Select for maximum speed in narrow supply applications where input range is constrained; requires redesign for rail-to-rail input handling. |
Compared with ADA4897-1ARJZ-R7 and OPA837IDBVR, the LT1809CS8#PBF uniquely combines rail-to-rail I/O, integrated shutdown, and 350 V/µs slew rate in an industry-standard SO-8 package - making it the only option among the three that supports low-voltage, power-gated, full-swing signal chain stages without layout changes.
Availability
LT1809CS8#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition, video signal routing, active filtering, and rail-to-rail buffering applications requiring stable component supply and long-term production continuity.
Supply support for LT1809CS8#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 LT1809CS8#PBF belongs to ADI's legacy Linear Technology high-speed op amp portfolio, engineered specifically for precision, low-distortion, rail-to-rail signal conditioning in space-constrained, low-voltage systems.
FAQ
What is the operating temperature range for the LT1809CS8#PBF?
The LT1809CS8#PBF is specified for operation from 0°C to 70°C. It is part of the 'C' grade series, with guaranteed performance across this commercial temperature range. While functional at –40°C to 85°C, those limits apply only to the 'I' grade variant (LT1809IS8#PBF), not the LT1809CS8#PBF.
Does the LT1809CS8#PBF support true rail-to-rail input and output operation?
Yes, the LT1809CS8#PBF supports rail-to-rail input (common-mode range extends from V– to V+) and rail-to-rail output (swings within 20 mV of both V+ and V– under load). This behavior is verified across all specified supply voltages (3 V, 5 V, ±5 V) and ensures maximum dynamic range in low-voltage applications.
How does the shutdown feature of the LT1809CS8#PBF behave during activation?
When the SHDN pin of the LT1809CS8#PBF is pulled low (<0.3 V), supply current drops to ≤1.4 mA and the output enters a high-impedance state within 50 ns. The amplifier resumes normal operation in ≤80 ns after SHDN returns high (>VS – 0.5 V), with no latch-up or startup overshoot observed in validated test circuits.
Can the LT1809CS8#PBF drive a 100 Ω load at 5 V supply without clipping?
Yes, the LT1809CS8#PBF can deliver ±85 mA output current and swings within 20 mV of each rail. At 5 V supply (0 V to 5 V), it sustains >4.9 VPP into 100 Ω with <0.1% THD at 1 MHz - confirmed in Electrical Characteristics tables and typical performance curves (Figures G08/G09).
What is the gain-bandwidth product of the LT1809CS8#PBF and how is it defined?
The LT1809CS8#PBF has a gain-bandwidth product of 180 MHz, specified for closed-loop gains ≥10. This value is measured at 2 MHz with AV ≥ 10 and reflects small-signal bandwidth scaling - e.g., at AV = 10, –3dB bandwidth ≈ 18 MHz; at AV = 100, ≈ 1.8 MHz. Unity-gain bandwidth is higher (320 MHz) but not used for GBW calculation per datasheet convention.
LT1809CS8#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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1809CS8#PBF FAQ
1.How can I place an order for LT1809CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1809CS8#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 LT1809CS8#PBF reliable?
The price and inventory of LT1809CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1809CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1809CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1809CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1809CS8#PBF?
LT1809CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1809CS8#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 LT1809CS8#PBF?
For technical support, including LT1809CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1809CS8#PBF requirements.
6.How does Aetrix verify that LT1809CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1809CS8#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 LT1809CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1809CS8#PBF?
All LT1809CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1809CS8#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 LT1809CS8#PBF part is unused and in its original packaging.
Return procedure for LT1809CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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