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Analog Devices Inc. LT1814CS#PBF
- Part No.:
- LT1814CS#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1814CS#PBF.pdf
- Description:
- IC VOLTAGE FEEDBACK 4 CIRC 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:293
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Product details
Overview
LT1814CS#PBF from Analog Devices (formerly Linear Technology) is a quad, low-power, high-speed voltage-feedback operational amplifier with 100MHz gain bandwidth, 750V/µs slew rate, and ±3.5V input common-mode range on ±5V supplies. It delivers ±40mA output current into 100Ω loads and operates from –40°C to 85°C, making it suitable for video amplification, active filters, and cable driver circuits requiring fast settling and low distortion.
For engineers reviewing the LT1814CS#PBF datasheet, LT1814CS#PBF pinout, LT1814CS#PBF application, or LT1814CS#PBF equivalent, key selection criteria include unity-gain stability with 1000pF capacitive loads, 8nV/√Hz input noise, 3.6mA per-amplifier supply current, and SO-14 package compatibility in industrial signal conditioning and wideband buffer designs.
Technical Context
The LT1814CS#PBF uses a proprietary voltage-feedback topology with current-feedback slewing behavior, enabling high slew rate without sacrificing DC precision. Its complementary NPN/PNP input stage provides first-order bias current cancellation, while internal compensation dynamically adapts to capacitive loads up to 1000pF.
It features rail-to-rail output swing capability (±3.5V into 100Ω on ±5V supplies), stable operation on single 5V or dual ±2.5V to ±5V supplies, and maintains ≥60MHz gain bandwidth across the full –40°C to 85°C temperature range with guaranteed performance for industrial-grade applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 100MHz - supports closed-loop gains up to 10 at 10MHz without phase margin degradation |
| Slew Rate | 750V/µs - enables <30ns 0.1% settling for 5V steps, critical for pulse fidelity in video and data acquisition |
| Supply Current per Amplifier | 3.6mA max - allows four-channel operation within 14.4mA total, ideal for space-constrained multichannel systems |
| Input Noise Voltage | 8nV/√Hz - preserves SNR in low-level signal amplification stages such as sensor front-ends |
| Output Drive | ±40mA min into 100Ω - directly drives coaxial cables, ADC inputs, or 75Ω video lines without external buffers |
| Capacitive Load Stability | Stable with 0–1000pF - eliminates need for external isolation resistors in cable driver and filter applications |
| Operating Temperature | –40°C to 85°C - qualified for industrial control, test equipment, and communications infrastructure |
Pinout & Package
LT1814CS#PBF is housed in a 14-lead plastic SO (Small Outline) package with standard 0.150-inch body width and 0.050-inch lead pitch. The package is RoHS-compliant and features gull-wing leads for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT A) | Amplifier A output | Drives external load; capable of ±3.5V swing into 100Ω on ±5V supplies |
| 2 (–IN A) | Inverting input A | High-impedance node; differential input voltage tolerance up to ±6V transient |
| 3 (+IN A) | Non-inverting input A | Matches –IN A in bias current cancellation; requires balanced source impedances for minimal offset |
| 4 (V+) | Positive supply rail | Accepts +2.5V to +6.5V (dual-supply mode); decoupling with 0.01µF ceramic required |
| 5 (+IN B) | Non-inverting input B | Independent channel input; shares no internal nodes with Channel A |
| 6 (–IN B) | Inverting input B | Independent channel input; supports separate feedback networks per channel |
| 7 (OUT B) | Amplifier B output | Electrically isolated from OUT A; channel separation >80dB at 1MHz |
| 8 (NC) | No connect | Internally unused; must remain unconnected per datasheet |
| 9 (OUT D) | Amplifier D output | Fourth independent output; identical AC/DC specs to OUT A and OUT B |
| 10 (–IN D) | Inverting input D | Supports fully independent fourth channel; not multiplexed or shared |
| 11 (+IN D) | Non-inverting input D | Enables four-channel parallel processing without crosstalk-induced errors |
| 12 (V–) | Negative supply rail | Accepts –2.5V to –6.5V (dual-supply mode); internally connected to exposed pad in DFN variants |
| 13 (+IN C) | Non-inverting input C | Third channel non-inverting input; enables simultaneous 4-channel signal conditioning |
| 14 (–IN C) | Inverting input C | Third channel inverting input; supports individual gain configuration per channel |
Key Features
| Feature | Design Value |
|---|---|
| Unity-gain stable with 1000pF load | Eliminates need for external compensation components in buffer and line-driver configurations |
| Low 8nV/√Hz input noise | Maintains signal integrity in high-gain sensor interfaces and medical instrumentation front-ends |
| 30ns 0.1% settling time | Meets timing requirements for 33Msps data acquisition and composite video signal reconstruction |
| ±3.5V input CMR on ±5V supplies | Allows direct interfacing with bipolar DAC outputs and legacy analog signal sources |
| Differential input voltage tolerance ±6V | Withstands transient overvoltage events without clamping diodes or series resistors |
| Channel separation >80dB at 1MHz | Prevents inter-channel crosstalk in multi-channel oscilloscopes and spectrum analyzers |
Applications
| Active Filter Design | Video Signal Buffering |
|---|---|
Use Scenario: Implementing a 4th-order Butterworth bandpass filter with independently adjustable gain, Q, and center frequency using two LT1814CS#PBF op-amps in cascade. IC Role / Device Role / Timing Role: Each amplifier serves as a unity-gain buffer between filter sections, preserving phase response and preventing loading effects. Use Value: Achieves <0.12dB peaking and –77dB distortion at 2MHz with 1kΩ load, verified in typical application circuit TA02. | Use Scenario: Driving 75Ω coaxial video lines in broadcast-quality SD/HD video distribution equipment. IC Role / Device Role / Timing Role: Acts as a DC-coupled video line driver with 0.12% differential gain error and 0.07° differential phase error at 10MHz. Use Value: Meets SMPTE 259M specifications for SD-SDI without external termination or equalization circuitry. |
| Cable Driver for Test Equipment | Data Acquisition Front-End |
Use Scenario: Transmitting calibrated analog signals over 10m RG-59 coaxial cable in automated test systems. IC Role / Device Role / Timing Role: Functions as a high-fidelity cable driver with series 75Ω output resistor and matched 75Ω termination at receiver end. Use Value: Delivers <25% overshoot and <30ns settling for 5V step signals, ensuring accurate pulse transmission without ringing. | Use Scenario: Conditioning low-level transducer outputs (e.g., strain gauges, thermocouples) prior to 16-bit SAR ADC sampling. IC Role / Device Role / Timing Role: Provides programmable gain, anti-alias filtering, and drive capability for multiplexed analog input channels. Use Value: Contributes <8nV/√Hz noise and <1.5mV input offset, enabling <12-bit effective resolution in 20kHz bandwidth systems. |
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 |
|---|---|---|---|
| AD8054ARZ | Higher 160MHz GBW but 15mA supply current per amp; 12nV/√Hz noise; only specified for –40°C to 125°C | Better bandwidth for RF IF stages; higher power disqualifies use in battery-powered portable instruments | Select when >120MHz closed-loop bandwidth is required and thermal management permits higher quiescent current |
| OPA4830IPW | Lower 250V/µs slew rate; 4.5mA supply current; 2.5nV/√Hz noise; unity-gain stable to 500pF only | Superior noise performance for precision instrumentation; insufficient slew for video or fast-settling DAQ | Select when ultra-low noise dominates over speed, and capacitive load ≤500pF is guaranteed |
Compared with AD8054ARZ and OPA4830IPW, the LT1814CS#PBF offers optimal balance of 100MHz bandwidth, 750V/µs slew, 3.6mA power, and 1000pF load tolerance-making it uniquely suited for industrial video, active filtering, and multichannel buffer applications where thermal and layout constraints limit alternatives.
Availability
LT1814CS#PBF is available at Aetrix Electronics and suitable for active filter design, video signal buffering, and cable driver applications requiring stable component supply, long-term industrial lifecycle support, and guaranteed extended temperature performance.
Supply support for LT1814CS#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 semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1814CS#PBF belongs to Linear Technology's high-speed precision op-amp product line, designed specifically for applications demanding wide bandwidth, fast settling, low distortion, and robust capacitive load driving capability in compact multichannel configurations.
FAQ
What is the maximum capacitive load the LT1814CS#PBF can drive while remaining stable?
The LT1814CS#PBF is specified as unity-gain stable with capacitive loads from 0pF to 1000pF. This capability is achieved through internal adaptive compensation that senses the load-induced pole and adjusts compensation at the gain node. Stability is maintained across the full –40°C to 85°C temperature range and for supply voltages from ±2.5V to ±5V. For loads exceeding 1000pF, external isolation resistors may be required.
Does the LT1814CS#PBF support single-supply operation?
Yes, the LT1814CS#PBF operates from a single 5V supply. Under this condition, the output swings from 1.1V to 3.9V into a 100Ω load referenced to 2.5V, and the input common-mode range extends from 0.8V to 3.5V. The device maintains 94MHz gain bandwidth and 350V/µs slew rate under single 5V operation, as confirmed in the Electrical Characteristics table for VS = 5V conditions.
What is the input bias current polarity behavior of the LT1814CS#PBF?
The LT1814CS#PBF uses a parallel NPN/PNP bipolar input stage that provides first-order bias current cancellation. Due to beta mismatch between the transistors, the net input bias current polarity (positive or negative) varies unit-to-unit and with temperature. However, the input offset current remains tightly controlled at ≤400nA. For best DC accuracy, balanced source impedances should be used at both inputs to minimize offset voltage contribution from bias current flow.
Can the LT1814CS#PBF be used as a comparator?
No, the LT1814CS#PBF is not intended for comparator use. Although its inputs tolerate ±6V differential voltage transiently, sustained differential input voltages cause excessive internal current (up to 40mA) and power dissipation, risking junction overheating. The device lacks comparator-specific features like open-collector output, hysteresis control, or propagation delay optimization. Dedicated comparators such as the LT1719 should be used instead.
What is the thermal resistance (θJA) of the LT1814CS#PBF in its SO-14 package?
The LT1814CS#PBF in the 14-lead SO package has a junction-to-ambient thermal resistance (θJA) of 150°C/W, as specified in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions. With a maximum junction temperature of 150°C and ambient temperature of 70°C, the device can dissipate up to 533mW before reaching thermal limit under worst-case load conditions.
LT1814CS#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- LT®
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- Voltage Feedback
- Number of Circuits:
- 4
- Output Type:
- -
- Slew Rate:
- 750V/µs
- Gain Bandwidth Product:
- 100 MHz
- -3db Bandwidth:
- 200 MHz
- Current - Input Bias:
- 900 nA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 3mA (x4 Channels)
- Current - Output / Channel:
- 60 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:
- 14-SO
LT1814CS#PBF FAQ
1.How can I place an order for LT1814CS#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1814CS#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 LT1814CS#PBF reliable?
The price and inventory of LT1814CS#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1814CS#PBF is usually 5 days.
3.What payment methods are accepted for LT1814CS#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1814CS#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1814CS#PBF?
LT1814CS#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1814CS#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 LT1814CS#PBF?
For technical support, including LT1814CS#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1814CS#PBF requirements.
6.How does Aetrix verify that LT1814CS#PBF is sourced from the original manufacturer or authorized distributors?
All LT1814CS#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 LT1814CS#PBF meets industry standards.
7.What is the process for return or replacement of LT1814CS#PBF?
All LT1814CS#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1814CS#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 LT1814CS#PBF part is unused and in its original packaging.
Return procedure for LT1814CS#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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