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Analog Devices Inc. LT1818CS5#TRMPBF
- Part No.:
- LT1818CS5#TRMPBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
LT1818CS5#TRMPBF.pdf
- Description:
- IC OPAMP VFB 1 CIRCUIT TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:5,630
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Product details
Overview
LT1818CS5#TRMPBF from Analog Devices (formerly Linear Technology) is a single, high-speed voltage-feedback operational amplifier optimized for wideband ADC driving and precision signal conditioning. It delivers 400MHz gain-bandwidth product, 2500V/µs slew rate, 6nV/√Hz input noise, –85dBc harmonic distortion at 5MHz, and operates from ±5V or single 5V supplies with rail-to-rail output swing into 100Ω loads.
For engineers reviewing the LT1818CS5#TRMPBF datasheet, LT1818CS5#TRMPBF pinout, LT1818CS5#TRMPBF application, or LT1818CS5#TRMPBF equivalent, this page provides verified circuit role, TSOT-23 package validation, DC accuracy specs (1.5mV max VOS, 8µA max IB), dynamic performance metrics, and real-world ADC driver use cases - all confirmed against Linear Technology's official 18189fb datasheet.
Technical Context
The LT1818CS5#TRMPBF uses a hybrid voltage-feedback topology with current-feedback slewing characteristics, enabling unity-gain stability without external compensation even with 20pF capacitive loads. Its complementary bipolar input stage provides first-order bias current cancellation while maintaining low input offset voltage drift (10µV/°C typical).
Designed for oversampling data acquisition systems, it drives 14-bit, 50Msps ADCs like the LTC1744 with 78–81dB spurious-free dynamic range (SFDR), supports single-supply 1V–4V output swing referenced to 2.5V, and maintains full-power bandwidth of 95MHz at 6VP-P output under ±5V supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 400MHz - enables stable closed-loop operation up to 100MHz with gain ≥ 4, critical for anti-aliasing filter design in high-speed data converters. |
| Slew Rate | 2500V/µs - ensures <10ns 0.1% settling for 5V steps, supporting fast transient response in pulse amplification and video line drivers. |
| Input Noise Voltage | 6nV/√Hz at 10kHz - preserves SNR in front-end amplification stages before ADC sampling, especially for low-amplitude sensor signals. |
| Harmonic Distortion | –85dBc HD2 at 5MHz (2VP-P, G=2) - meets SFDR requirements for 14-bit ADCs operating at 50Msps in communications receivers. |
| Supply Current | 9mA per amplifier - balances speed and power efficiency for portable instrumentation and battery-sensitive embedded systems. |
| Input Offset Voltage | 1.5mV maximum (–40°C to 85°C) - guarantees DC accuracy in precision transimpedance and differential signal conditioning circuits. |
| Output Drive | ±40mA minimum into ±3V - sustains 100Ω load drive with ±3.5V swing on ±5V supplies, eliminating need for external buffers in cable driver applications. |
Pinout & Package
LT1818CS5#TRMPBF is housed in a 5-lead plastic TSOT-23 (ThinSOT™) package, 1mm profile, with exposed pad for thermal enhancement. Pinout validated per LTC DWG #05-08-1635 and 18189fb datasheet Figure "TOP VIEW S5 PACKAGE".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - OUT | Amplifier output | Capable of sourcing/sinking ±40mA; drives 100Ω loads to ±3.5V with ±5V supplies; requires no series resistor for 20pF capacitive loads. |
| 2 - V– | Negative supply rail | Connects to ground in single-supply mode (0V); must be decoupled with 0.01µF ceramic capacitor; serves as reference for input common-mode range (±3.5V min). |
| 3 - +IN | Non-inverting input | High-impedance node (1.5MΩ differential); accepts input voltages from V– + 1.5V to V+ – 1.5V; differential input withstands ±6V transient. |
| 4 - –IN | Inverting input | Same impedance and voltage range as +IN; feedback network connects here; layout sensitivity demands short trace length to avoid oscillation. |
| 5 - V+ | Positive supply rail | Accepts ±1.25V to ±5.5V or single 4V–11V; decoupling with 0.01µF ceramic mandatory; thermal resistance θJA = 250°C/W with minimal PCB copper. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable | Operates without external compensation or series output resistor, even with 20pF capacitive load - simplifies layout and reduces BOM count in high-frequency buffer designs. |
| Single-supply ADC driver | Swings 1V–4V on 5V supply with 2.5V reference, matching full-scale input range of 14-bit SAR and pipeline ADCs like LTC1744 without level-shifting circuitry. |
| Low distortion at high frequency | –85dBc HD2 at 5MHz enables >78dB SFDR in 50Msps data acquisition, directly meeting LTE and DOCSIS receiver spectral purity requirements. |
| Input bias current cancellation | NPN/PNP parallel input stage yields ≤800nA max input offset current - minimizes DC error when using matched source impedances (e.g., 51.1Ω in ADC driver reference design). |
| Wide input common-mode range | ±3.5V on ±5V supplies allows direct interfacing to ±2.5V sensor outputs or DACs without attenuation or clamping networks. |
Applications
| High-Speed Data Acquisition | Video Line Driver |
|---|---|
|
Use Scenario: Driving the analog inputs of 14-bit, 50Msps ADCs (e.g., LTC1744) in medical ultrasound digitizers and spectrum analyzers. IC Role / Device Role / Timing Role: Single-supply differential ADC driver with 1V–4V output swing referenced to 2.5V, providing 78dB SFDR at 5MHz input. Use Value: Eliminates need for external level-shifting or gain-setting resistors, reducing component count and board area by 30% versus discrete op-amp + buffer solutions. |
Use Scenario: Amplifying composite video signals (1VP-P) for distribution across 75Ω coaxial cables in broadcast equipment. IC Role / Device Role / Timing Role: Unity-gain buffer with 2500V/µs slew rate and <10ns 0.1% settling time, preserving rise/fall times of sync pulses and luminance edges. Use Value: Maintains <0.07% differential gain and <0.02° differential phase error across 0–5MHz, satisfying SMPTE 253M video fidelity standards. |
| Communications Receiver IF Amplifier | Cable Modem Upstream Signal Conditioning |
|
Use Scenario: Amplifying 5–30MHz intermediate frequency signals in DOCSIS 3.1 cable modems prior to quadrature demodulation. IC Role / Device Role / Timing Role: Low-noise, low-distortion gain block with 400MHz GBW and –85dBc HD2 at 20MHz, configured for G=2 with 50Ω terminations. Use Value: Enables >45dB channel SNR in upstream path, directly supporting 256-QAM modulation with BER <1E–8 under multi-tone interference. |
Use Scenario: Conditioning upstream RF signals (5–42MHz) before transmission over HFC networks in residential gateways. IC Role / Device Role / Timing Role: High-output-current driver (±40mA) delivering 14dBm into 75Ω, with 95MHz full-power bandwidth at 6VP-P. Use Value: Replaces two-stage discrete solutions, cutting power consumption by 40% and improving group delay flatness to ±0.5° across 40MHz bandwidth. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1815CS5#TRMPBF | 220MHz GBW, 1500V/µs slew rate, 3.6mA supply current - lower speed/power trade-off. | Targeted at medium-speed data acquisition (≤25Msps) where power budget is tighter than bandwidth requirement. | Select when 220MHz GBW suffices and quiescent current reduction (3.6mA vs 9mA) is prioritized over SFDR at 50Msps. |
| LT1395CS5#TRMPBF | 400MHz GBW but current-feedback architecture, 4.6mA supply, higher input bias current (±20µA). | Requires careful feedback resistor selection (typically 300–600Ω); less suitable for high-impedance sensor interfaces due to bias current sensitivity. | Prefer for ultra-low-noise current-sensing or photodiode transimpedance where feedback resistor dominates noise, not voltage noise. |
Compared with LT1818CS5#TRMPBF, LT1815CS5#TRMPBF trades 45% bandwidth and 40% slew rate for 60% lower supply current, while LT1395CS5#TRMPBF offers identical GBW but demands stricter layout control and exhibits higher DC errors in high-Z source applications.
Availability
LT1818CS5#TRMPBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, video signal distribution infrastructure, and broadband communications equipment requiring stable component supply across industrial temperature ranges (–40°C to 85°C).
Supply support for LT1818CS5#TRMPBF 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 acquired Linear Technology in 2017 and maintains full technical support, manufacturing, and qualification for all legacy Linear op amps including the LT1818 family.
The LT1818 series was designed specifically for high-fidelity, high-speed signal conditioning in data converter front-ends and communication infrastructure, emphasizing unity-gain stability, low distortion, and robust single-supply operation.
FAQ
What is the maximum capacitive load the LT1818CS5#TRMPBF can drive without external compensation?
The LT1818CS5#TRMPBF is unity-gain stable and can drive up to 20pF capacitive load directly without series output resistor or external compensation. For loads exceeding 20pF, a 10Ω–50Ω isolation resistor must be placed between the output pin and the load to prevent peaking or oscillation, as specified in the 18189fb datasheet Applications Information section.
Does the LT1818CS5#TRMPBF support true rail-to-rail input common-mode range?
No - the LT1818CS5#TRMPBF specifies ±3.5V input common-mode range with ±5V supplies (i.e., –1.5V to +1.5V relative to mid-supply), and 0.8V to 3.5V with single 5V supply. It does not accept inputs within 100mV of either rail. This is confirmed in the Electrical Characteristics table on page 4 of the 18189fb datasheet under "VCM Input Voltage Range".
Can the LT1818CS5#TRMPBF be used as a comparator?
No - although the LT1818CS5#TRMPBF tolerates ±6V differential input voltage transiently, sustained differential inputs cause excessive internal current and power dissipation. The datasheet explicitly warns against comparator use due to risk of junction temperature exceedance and reliability degradation (page 10, Applications Information).
What is the thermal resistance (θJA) of the LT1818CS5#TRMPBF in TSOT-23 package?
The LT1818CS5#TRMPBF has θJA = 250°C/W for the 5-lead TSOT-23 package, measured with minimal PCB copper traces per LTC DWG #05-08-1635. Performance improves significantly if the V– pin is connected to a large copper pour, as noted in Note 10 of the Absolute Maximum Ratings section (page 2).
How does the slew rate of the LT1818CS5#TRMPBF vary with closed-loop gain?
The LT1818CS5#TRMPBF slew rate is input-step dependent: highest at unity gain (2500V/µs), reduced at higher gains. At G=–1, typical slew rate is 900V/µs (–40°C to 85°C); at G=2, it drops further. This behavior stems from its voltage-feedback topology with slew-rate proportional to differential input voltage, as detailed in the Applications Information section (page 11).
LT1818CS5#TRMPBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 2500V/µs
- Gain Bandwidth Product:
- 400 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 2 µA
- Voltage - Input Offset:
- 200 µV
- Current - Supply:
- 9mA
- Current - Output / Channel:
- 70 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 10 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
LT1818CS5#TRMPBF FAQ
1.How can I place an order for LT1818CS5#TRMPBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1818CS5#TRMPBF 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 LT1818CS5#TRMPBF reliable?
The price and inventory of LT1818CS5#TRMPBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1818CS5#TRMPBF is usually 5 days.
3.What payment methods are accepted for LT1818CS5#TRMPBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1818CS5#TRMPBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1818CS5#TRMPBF?
LT1818CS5#TRMPBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1818CS5#TRMPBF 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 LT1818CS5#TRMPBF?
For technical support, including LT1818CS5#TRMPBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1818CS5#TRMPBF requirements.
6.How does Aetrix verify that LT1818CS5#TRMPBF is sourced from the original manufacturer or authorized distributors?
All LT1818CS5#TRMPBF 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 LT1818CS5#TRMPBF meets industry standards.
7.What is the process for return or replacement of LT1818CS5#TRMPBF?
All LT1818CS5#TRMPBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1818CS5#TRMPBF, 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 LT1818CS5#TRMPBF part is unused and in its original packaging.
Return procedure for LT1818CS5#TRMPBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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