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Analog Devices Inc. LT1819IS8#PBF
- Part No.:
- LT1819IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1819IS8#PBF.pdf
- Description:
- IC OPAMP GP 2 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:258
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Product details
Overview
LT1819IS8#PBF from Analog Devices (formerly Linear Technology) is a dual high-speed voltage-feedback operational amplifier optimized for wideband, low-distortion signal conditioning. It delivers 400MHz gain-bandwidth product, 2500V/µs slew rate, –85dBc harmonic distortion at 5MHz, 6nV/√Hz input noise, and 1.5mV max input offset voltage across –40°C to 85°C. It drives ±3.5V into 100Ω on ±5V supplies and operates stably with 20pF capacitive load-ideal for single-supply ADC driver applications in data acquisition systems.
For engineers reviewing the LT1819IS8#PBF datasheet, LT1819IS8#PBF pinout, LT1819IS8#PBF application, or LT1819IS8#PBF equivalent, key selection criteria include unity-gain stability without series output resistor, differential input voltage tolerance up to ±6V (transient), channel separation ≥80dB, and guaranteed performance over industrial temperature range with SO-8 package compatibility.
Technical Context
The LT1819IS8#PBF employs a hybrid voltage-feedback architecture with current-feedback slewing characteristics, enabling simultaneous high bandwidth and excellent DC precision. Its input stage uses complementary NPN/PNP bipolar transistors for first-order bias current cancellation, while the output stage features robust emitter-follower buffering capable of sourcing/sinking ≥40mA into 100Ω loads.
It is specified for both dual ±5V and single 5V operation, supporting rail-to-rail input common-mode range (±3.5V on ±5V, 0.8V–3.5V on 5V) and delivering full-swing output (±3.5V into 100Ω on ±5V; 1V–4V into 100Ω referenced to 2.5V on 5V). Stability is ensured up to 20pF capacitive loading at unity gain without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 400MHz typical - enables stable closed-loop operation up to ~300MHz at AV = 2 with 500Ω load |
| Slew Rate | 2500V/µs (AV = 1) - supports fast transient response for 6VP-P signals without slewing distortion |
| Harmonic Distortion | –85dBc HD2 at 5MHz, AV = 2, 2VP-P - meets SFDR >78dB in 50Msps ADC front-ends |
| Input Noise Voltage | 6nV/√Hz at 10kHz - preserves SNR in low-level signal amplification stages |
| Supply Current | 9mA per amplifier - balances speed and power efficiency for dual-channel high-speed designs |
| Input Offset Voltage | 1.5mV maximum (–40°C to 85°C) - ensures DC accuracy in precision gain blocks and sensor interfaces |
| Channel Separation | 80dB minimum (–40°C to 85°C) - maintains crosstalk isolation in dual-path signal chains like differential ADC drivers |
| Operating Temperature | –40°C to 85°C - qualified for industrial-grade embedded systems and instrumentation |
Pinout & Package
LT1819IS8#PBF is housed in an 8-lead plastic SO (Small Outline) package with 150°C/W junction-to-ambient thermal resistance, standard .150-inch body width, and gull-wing leads compatible with IPC-7351B land patterns.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Capable of ±3.5V swing into 100Ω on ±5V supplies; requires no series resistor for 20pF capacitive load stability |
| 2 (–IN A) | Inverting input A | Differential input voltage rating ±6V (transient only); matched impedance critical for DC accuracy due to ±8μA input bias current |
| 3 (+IN A) | Non-inverting input A | Same differential voltage rating as Pin 2; balanced source resistances recommended to minimize offset error from input offset current |
| 4 (V–) | Negative supply rail | Connects to ground in single-supply mode; must be bypassed with 0.01µF ceramic capacitor for high-frequency PSRR |
| 5 (V+) | Positive supply rail | Accepts ±1.25V to ±5.5V or single 4V–11V; bypassing required to maintain 76dB PSRR above 10kHz |
| 6 (+IN B) | Non-inverting input B | Electrically identical to Pin 3; independent channel allows fully differential configurations without external coupling |
| 7 (–IN B) | Inverting input B | Electrically identical to Pin 2; channel separation ≥80dB prevents interference between A/B paths at 10MHz |
| 8 (OUT B) | Amplifier B output | Matches Pin 1 performance; enables true differential drive for LTC1744-style 14-bit, 50Msps ADC interfaces |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable with 20pF load | Eliminates need for series output resistor in ADC driver layouts, preserving bandwidth and reducing component count |
| Low 6nV/√Hz input noise | Minimizes added noise floor in front-end amplifiers for 14-bit+ data acquisition systems operating up to 25MHz |
| ±6V differential input tolerance | Withstands transient overvoltage events without clamping diodes, simplifying protection circuitry in noisy environments |
| 80dB channel separation | Enables accurate differential signaling in dual-amplifier configurations such as I/Q demodulators or transformerless ADC drivers |
| Guaranteed –40°C to 85°C operation | Validated performance across full industrial temperature range-no derating required for embedded instrumentation deployments |
| SO-8 package compatibility | Direct drop-in replacement for legacy dual op amps (e.g., LT1363, AD8042) using standard PCB footprints and reflow profiles |
Applications
| High-Speed Data Acquisition | Differential ADC Driver |
|---|---|
Use Scenario: Driving the analog inputs of a 14-bit, 50Msps ADC (e.g., LTC1744) in oversampling architectures requiring >78dB SFDR. IC Role / Device Role / Timing Role: Dual-channel single-supply amplifier configured as fully differential driver with 51.1Ω termination and 18pF compensation. Use Value: Achieves 81dB spurious-free dynamic range at 5MHz input via –85dBc distortion and 6nV/√Hz noise, eliminating need for external filtering. | Use Scenario: Converting single-ended sensor outputs (e.g., piezoelectric accelerometers) to differential signals for noise-immune transmission to ADCs. IC Role / Device Role / Timing Role: One LT1819IS8#PBF channel buffers reference voltage while the other conditions and inverts the sensor signal to form true differential pair. Use Value: 80dB channel separation prevents crosstalk-induced common-mode error; 2500V/µs slew rate handles fast transients without distortion. |
| Video Signal Conditioning | Communication Receiver IF Amplifier |
Use Scenario: Amplifying composite video signals (e.g., NTSC/PAL) in broadcast equipment requiring <0.1% differential gain/phase error. IC Role / Device Role / Timing Role: Unity-gain buffer with 150Ω load matching, operating on ±5V supplies to preserve DC restoration and sync tip integrity. Use Value: 0.07% differential gain and 0.02° differential phase error at 5MHz ensure broadcast-grade color fidelity without post-correction. | Use Scenario: Intermediate frequency (IF) amplification in SDR receivers where 5–25MHz band signals require low-noise, high-linearity gain before digitization. IC Role / Device Role / Timing Role: Fixed-gain (AV = 2) amplifier stage with 500Ω feedback network, leveraging 400MHz GBW for flat group delay across 20MHz bandwidth. Use Value: –85dBc HD2/HD3 at 5MHz preserves adjacent-channel selectivity; 6nV/√Hz noise maintains receiver sensitivity below –110dBm. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD8042ARZ | Lower GBW (160MHz), higher supply current (12.5mA), no guaranteed –40°C to 85°C spec for all parameters | Less suitable for >30MHz closed-loop designs; requires tighter layout control for stability at high gains | Select when cost sensitivity outweighs bandwidth needs and ambient temperature stays within 0°C–70°C |
| LT1363CS8#PBF | Lower slew rate (1000V/µs), higher input offset (2mV max), same SO-8 package but not unity-gain stable with 20pF load | Requires series output resistor for capacitive loads; limited to ≤100MHz applications demanding lower distortion | Select for legacy designs where board space prohibits layout changes and bandwidth requirements are ≤125MHz |
Compared with AD8042ARZ and LT1363CS8#PBF, the LT1819IS8#PBF provides 2.5× higher gain-bandwidth, 2.5× faster slew rate, and guaranteed industrial temperature performance-making it optimal for new high-fidelity data acquisition and communications front-ends where signal integrity is critical.
Availability
LT1819IS8#PBF is available at Aetrix Electronics and suitable for high-speed data acquisition systems, differential ADC driver circuits, and communication receiver IF amplifiers requiring stable component supply with full industrial temperature qualification.
Supply support for LT1819IS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors for precision instrumentation, industrial automation, and communications infrastructure.
The LT1819IS8#PBF belongs to Linear Technology's high-speed op amp product line, engineered specifically for applications demanding simultaneous wide bandwidth, low distortion, and robust DC precision-including oversampling ADC drivers, video signal conditioning, and RF/IF amplification.
FAQ
What is the maximum capacitive load the LT1819IS8#PBF can drive without external compensation?
The LT1819IS8#PBF is unity-gain stable with up to 20pF capacitive load on its output without requiring a series resistor or external compensation network. This capability simplifies PCB layout for ADC driver applications and eliminates potential phase margin degradation caused by output RC networks. For loads exceeding 20pF, a 10Ω–50Ω isolation resistor must be placed between the output and the capacitance to maintain stability, with feedback taken directly from the amplifier output pin.
Does the LT1819IS8#PBF support single-supply operation, and what is its input/output voltage range under 5V supply?
Yes, the LT1819IS8#PBF is fully specified for single 5V operation. With V+ = 5V and V– = 0V, its input common-mode range extends from 0.8V to 3.5V (guaranteed), and its output swings from 1.0V to 4.0V into a 100Ω load referenced to 2.5V. This rail-to-rail input/output behavior enables direct interfacing with 3.3V logic and ADC references without level-shifting circuitry, as demonstrated in the LTC1744 ADC driver reference design.
How does the slew rate of the LT1819IS8#PBF vary with closed-loop gain configuration?
The LT1819IS8#PBF exhibits gain-dependent slew rate due to its input-stage architecture: it achieves 2500V/µs at AV = 1 (non-inverting), 900V/µs at AV = –1 (inverting), and lower values at higher gains. This occurs because slew rate is proportional to differential input voltage-larger input steps occur at lower gains. For example, a 6V output step yields a 6V input step at unity gain but only 0.6V at AV = 10, directly scaling the available charging current into the internal compensation node.
What is the channel separation specification for the LT1819IS8#PBF, and why is it important in differential applications?
The LT1819IS8#PBF guarantees ≥80dB channel separation over –40°C to 85°C at 10MHz. This metric quantifies isolation between Amplifier A and Amplifier B-critical in differential ADC driver topologies where one channel processes the inverted signal and the other the non-inverted signal. High channel separation prevents crosstalk-induced common-mode rejection ratio (CMRR) degradation, ensuring accurate differential signal reconstruction and maintaining SFDR performance in high-resolution sampling systems.
Can the LT1819IS8#PBF be used as a comparator, and what are the limitations?
No, the LT1819IS8#PBF is not designed for comparator operation. Although its inputs tolerate ±6V differential voltage transiently, sustained differential input voltages cause excessive internal current flow (up to 50mA) and power dissipation, risking thermal damage. The device lacks internal hysteresis, open-collector output, or propagation delay optimization required for reliable comparator functionality. Its unity-gain stability and precision DC specs are optimized for linear amplification-not saturated switching-so dedicated comparators (e.g., LT1719) should be used instead.
LT1819IS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1819IS8#PBF FAQ
1.How can I place an order for LT1819IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1819IS8#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 LT1819IS8#PBF reliable?
The price and inventory of LT1819IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1819IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1819IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1819IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1819IS8#PBF?
LT1819IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1819IS8#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 LT1819IS8#PBF?
For technical support, including LT1819IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1819IS8#PBF requirements.
6.How does Aetrix verify that LT1819IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1819IS8#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 LT1819IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1819IS8#PBF?
All LT1819IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1819IS8#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 LT1819IS8#PBF part is unused and in its original packaging.
Return procedure for LT1819IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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