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Analog Devices Inc. LT1819CMS8#PBF
- Part No.:
- LT1819CMS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LT1819CMS8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:324
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Product details
Overview
LT1819CMS8#PBF from Analog Devices (formerly Linear Technology) is a dual high-speed voltage-feedback operational amplifier optimized for wideband, low-distortion signal conditioning in precision data acquisition and ADC driver applications. It delivers 400MHz gain-bandwidth product, 2500V/µs slew rate, –85dBc harmonic distortion at 5MHz, 9mA per amplifier supply current, and operates from ±5V or single 5V supplies with rail-to-rail output swing into 100Ω loads.
For engineers reviewing the LT1819CMS8#PBF datasheet, LT1819CMS8#PBF pinout, LT1819CMS8#PBF application, or LT1819CMS8#PBF equivalent, key selection criteria include unity-gain stability with 20pF capacitive load, input offset voltage ≤1.5mV, channel separation ≥82dB, and MSOP-8 package compatibility with space-constrained high-frequency PCB layouts.
Technical Context
The LT1819CMS8#PBF employs a hybrid voltage-feedback architecture with current-feedback slewing characteristics, enabling simultaneous high DC accuracy and wide dynamic range. Its complementary NPN/PNP input stage provides first-order bias current cancellation while maintaining low input noise (6nV/√Hz) and tight input offset drift (10μV/°C).
Designed for unity-gain stability without external compensation, it drives 100Ω loads to ±3.5V with ±5V supplies and swings 1V to 4V on single 5V rails with 2.5V common-mode reference. Harmonic distortion remains below –85dBc up to 5MHz at AV = 2 with 2VP-P output into 500Ω.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 400MHz - enables stable closed-loop operation up to 200MHz at AV = 2 for high-resolution video or RF IF amplification |
| Slew Rate | 2500V/µs - supports full-scale transient response for 14-bit ADCs sampling at 50Msps without slewing-induced distortion |
| Input Offset Voltage | 1.5mV max - ensures <0.1% gain error in precision instrumentation amplifier front-ends |
| Harmonic Distortion | –85dBc at 5MHz - meets SFDR requirements for oversampling ADC drivers in communications receivers |
| Supply Current | 9mA per amplifier - balances speed and power efficiency for dual-channel portable test equipment |
| Channel Separation | 82dB min - prevents crosstalk between differential ADC inputs in single-supply systems |
| Input Noise Density | 6nV/√Hz - preserves SNR in low-level sensor signal amplification stages |
Pinout & Package
LT1819CMS8#PBF is housed in an 8-lead plastic MSOP (MS8) package, 3.0mm × 3.0mm × 0.86mm profile, with exposed pad for thermal enhancement. Pin 1 marked by dot; lead pitch 0.65mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | V+ | Positive supply connection - must be decoupled with 0.01µF ceramic capacitor placed within 2mm |
| 2 | OUT A | Amplifier A output - capable of sourcing/sinking ±40mA into 100Ω load at ±3.5V swing |
| 3 | –IN A | Inverting input of Amplifier A - requires matched source impedance to +IN A to minimize offset due to input bias current mismatch |
| 4 | +IN A | Non-inverting input of Amplifier A - differential input voltage withstands ±6V transients without damage |
| 5 | +IN B | Non-inverting input of Amplifier B - shares same layout constraints as +IN A for dual-channel symmetry |
| 6 | –IN B | Inverting input of Amplifier B - input capacitance 1.5pF limits high-Z feedback network bandwidth |
| 7 | OUT B | Amplifier B output - independent channel operation allows differential drive of ADC inputs |
| 8 | V– | Negative supply connection - recommended to connect to large copper pour for θJA = 250°C/W thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable with 20pF load | Eliminates need for series output resistor in ADC driver configurations, preserving signal integrity |
| Single-supply operation (5V) | Enables direct interface with 3.3V/5V logic and SAR ADCs without level-shifting circuitry |
| Low input offset drift (10μV/°C) | Maintains calibration stability across industrial temperature range (0°C to 70°C) |
| High channel separation (82dB) | Prevents inter-channel interference in dual-path signal chains such as I/Q demodulators |
| Specified distortion at 5MHz | Validates performance for 5G NR sub-6GHz receiver IF stages and cable modem upstream paths |
Applications
| High-Speed Data Acquisition | Differential ADC Driver |
|---|---|
Use Scenario: 14-bit, 50Msps LTC1744 ADC digitizing baseband signals in software-defined radio front-ends. IC Role / Device Role / Timing Role: Dual op-amp configured as single-ended-to-differential converter driving AIN+ and AIN– inputs. Use Value: 81dB spurious-free dynamic range achieved at 5MHz input using LT1819CMS8#PBF, meeting LTE-A receiver linearity requirements. | Use Scenario: Single 5V supply system where ADC common-mode voltage is fixed at 2.5V. IC Role / Device Role / Timing Role: Each amplifier drives one leg of differential input with rail-to-rail swing (1V to 4V) referenced to 2.5V. Use Value: Output swing compliance eliminates need for external biasing networks, reducing component count and board area. |
| Video Signal Buffering | Communication Receiver IF Amplifier |
Use Scenario: SDI/HDMI analog video path requiring 0.07% differential gain and 0.02° differential phase accuracy. IC Role / Device Role / Timing Role: Unity-gain buffer isolating source from 75Ω coaxial cable load. Use Value: Measured dG/dP of 0.07%/0.02° at 5MHz ensures broadcast-grade color fidelity without post-correction. | Use Scenario: 70MHz IF stage in cellular base station receiver after downconversion. IC Role / Device Role / Timing Role: Fixed-gain (AV = 2) amplifier with 50Ω input/output matching. Use Value: –85dBc HD2/HD3 at 5MHz enables >15-bit ENOB in multi-carrier WCDMA signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1819CS8#PBF | SO-8 package, same electrical specs, higher θJA (150°C/W), rated for 0°C to 70°C | Better thermal performance in high-power-density layouts; requires larger PCB footprint | Select when board space permits and thermal management via heatsink is preferred over MSOP compactness |
| LT1819IMS8#PBF | Identical MSOP-8 package but specified for –40°C to 85°C industrial temperature range | Required for automotive or outdoor infrastructure deployments outside commercial temperature envelope | Select when extended temperature qualification is mandatory; no electrical trade-offs versus LT1819CMS8#PBF |
Compared with LT1819CS8#PBF, LT1819CMS8#PBF offers 3× smaller footprint and superior high-frequency layout control, while LT1819IMS8#PBF extends operating range without altering speed, noise, or distortion performance-making LT1819CMS8#PBF optimal for cost-sensitive commercial data acquisition designs.
Availability
LT1819CMS8#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, communication receiver IF stages, video signal buffering, and differential ADC driver circuits requiring stable component supply with guaranteed lead-free compliance and traceable lot history.
Supply support for LT1819CMS8#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 acquired Linear Technology in 2017 and maintains its legacy high-performance analog portfolio. Linear Technology was founded in 1981 and specialized in precision, high-speed, and power-efficient analog ICs.
The LT1819CMS8#PBF belongs to Linear Technology's LT1818/LT1819 family of dual high-speed op-amps engineered for wideband, low-distortion signal conditioning in data acquisition, communications, and video systems where unity-gain stability and rail-to-rail output swing are critical.
FAQ
What is the maximum capacitive load the LT1819CMS8#PBF can drive in unity-gain configuration without external compensation?
The LT1819CMS8#PBF is unity-gain stable with up to 20pF capacitive load directly at the output. Driving larger loads (e.g., >20pF) requires a 10Ω–50Ω isolation resistor between the output and the load to prevent peaking or oscillation, while maintaining feedback connection directly at the amplifier output pin.
Does the LT1819CMS8#PBF support true single-supply operation with input common-mode voltage extending to the negative rail?
No. With single 5V supply, the LT1819CMS8#PBF input common-mode range is specified from 0.8V to 4.2V (min/max), not to the negative rail (0V). Input voltages below 0.8V are not guaranteed to meet CMRR or offset specifications, and operation near V– may degrade distortion performance.
What is the typical harmonic distortion performance of the LT1819CMS8#PBF at 10MHz?
While the LT1819CMS8#PBF is characterized for –85dBc HD2/HD3 at 5MHz, distortion degrades above this frequency. At 10MHz, typical HD2 is –72dBc and HD3 is –74dBc under identical conditions (AV = 2, 2VP-P, RL = 500Ω), as confirmed in the device's Electrical Characteristics table for single-supply operation.
Can the LT1819CMS8#PBF be used as a comparator?
No. Although the LT1819CMS8#PBF tolerates ±6V differential input transients, sustained differential inputs cause excessive internal power dissipation and risk junction overheating. Its design lacks comparator-specific features like open-collector output or propagation delay optimization, and it is not characterized for comparator use.
How does the slew rate of the LT1819CMS8#PBF vary with closed-loop gain?
The LT1819CMS8#PBF slew rate is input-step dependent: highest at unity gain (2500V/µs), reduced at higher gains. For example, at AV = –1, typical slew rate is 900V/µs (0°C to 70°C); at AV = 2, it drops further due to smaller input step for same output swing-consistent with its voltage-feedback topology with current-feedback slewing behavior.
LT1819CMS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 2
- 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 (x2 Channels)
- Current - Output / Channel:
- 70 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-MSOP
LT1819CMS8#PBF FAQ
1.How can I place an order for LT1819CMS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1819CMS8#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 LT1819CMS8#PBF reliable?
The price and inventory of LT1819CMS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1819CMS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1819CMS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1819CMS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1819CMS8#PBF?
LT1819CMS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1819CMS8#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 LT1819CMS8#PBF?
For technical support, including LT1819CMS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1819CMS8#PBF requirements.
6.How does Aetrix verify that LT1819CMS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1819CMS8#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 LT1819CMS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1819CMS8#PBF?
All LT1819CMS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1819CMS8#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 LT1819CMS8#PBF part is unused and in its original packaging.
Return procedure for LT1819CMS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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