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Analog Devices Inc. LT1191CN8
- Part No.:
- LT1191CN8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Video Amps and Modules
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1191CN8.pdf
- Description:
- IC AMP GENERAL PURPOSE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,430
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Product details
Overview
LT1191CN8 from Analog Devices (formerly Linear Technology) is an ultrahigh-speed voltage-feedback operational amplifier optimized for ±5V and single 5V supply operation, delivering 90MHz gain-bandwidth product, 450V/µs slew rate, ±50mA output drive, 110ns 0.1% settling time, and integrated output shutdown. It serves as a video cable driver, fast integrator, and pulse amplifier in broadcast video routing and high-resolution analog signal paths.
For engineers reviewing the LT1191CN8 datasheet, LT1191CN8 pinout, LT1191CN8 application, or LT1191CN8 equivalent, key selection criteria include full-power bandwidth into 75Ω loads, differential gain/phase error under video conditions, shutdown leakage and turn-off timing, input offset drift over temperature, and stability with capacitive loads up to 30pF.
Technical Context
The LT1191CN8 employs a voltage-feedback architecture with unity-gain-stable 90MHz bandwidth and >20V/mV large-signal open-loop gain. Its internal compensation enables stable operation at AV = 1 while driving 1kΩ loads and tolerating 30pF capacitive loads when isolated with 10Ω series resistance.
Pin 5 implements a true high-impedance shutdown mode, reducing supply current to 1.4mA typ and dissipation to 15mW while maintaining 15kΩ output impedance. The amplifier supports both inverting and noninverting configurations but requires noninverting topology for multiplexing applications due to feedback path coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 90MHz - Enables stable closed-loop gain ≥1 with bandwidth sufficient for NTSC/PAL video (4.2–6MHz) and fast pulse amplification. |
| Slew Rate | 450V/µs - Supports clean 7VP-P output swing at 20MHz full-power bandwidth into 1kΩ, critical for composite video fidelity. |
| Output Current | ±50mA - Drives 75Ω double-terminated coaxial cables to 7.5VP-P on ±5V supplies without clipping or distortion. |
| Settling Time | 110ns to 0.1% - Meets high-speed data acquisition and DAC reconstruction timing requirements with minimal transient error. |
| Differential Gain/Phase Error | 0.07%/0.02° at RL = 1kΩ - Preserves color fidelity in RGB or Y/C video signal paths per NTSC 3.58MHz standard. |
| Input Offset Voltage | 2–6mV (N8 package, 0°C to 70°C) - Allows DC-coupled video gain stages without significant baseline shift in multi-stage designs. |
| Shutdown Supply Current | 1.4mA typical - Enables low-power multiplexing of multiple LT1191CN8 amplifiers onto shared video buses with <400ns turn-off delay. |
Pinout & Package
LT1191CN8 is housed in an 8-pin plastic DIP (PDIP) package with industry-standard op-amp pinout and 0.300-inch width. Pin 5 is dedicated to shutdown control; all other pins match conventional dual-supply op-amp assignments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BAL) | Offset Null Input | Connects to wiper of 1kΩ–10kΩ potentiometer for manual input offset trimming; unused in most video applications. |
| 2 (–IN) | Inverting Input | Primary feedback node; sensitive to stray capacitance-requires low-impedance feedback network (≤1kΩ) for stability. |
| 3 (+IN) | Noninverting Input | Reference input for single-ended or differential configurations; common-mode range extends to ±VS rails. |
| 4 (V–) | Negative Supply Rail | Accepts –5V (dual supply) or 0V (single supply); shutdown pin referenced to this rail. |
| 5 (SHDN) | Shutdown Control | Pull to V– to disable output and reduce quiescent current; must remain ≤0.4V above V– for reliable activation. |
| 6 (OUT) | Amplifier Output | Capable of ±50mA sink/source; presents 15kΩ high-Z state in shutdown-no external pull-down required. |
| 7 (V+) | Positive Supply Rail | Accepts +5V (single supply) or +5V (dual supply); bypassing with 0.1µF ceramic + 4.7µF tantalum minimizes settling degradation. |
| 8 (BAL) | Offset Null Input | Second terminal for offset nulling potentiometer; tied to Pin 1 for symmetric adjustment. |
Key Features
| Feature | Design Value |
|---|---|
| Video-optimized performance | 0.07% differential gain / 0.02° phase error at 3.58MHz ensures broadcast-grade color reproduction in RGB/YUV systems. |
| True high-Z shutdown | 15kΩ output impedance in shutdown mode eliminates need for external isolation switches in video MUX architectures. |
| Single-supply capability | Operates from +5V only with input common-mode range from –2.5V to +3.5V and output swing to ±3.7V into 1kΩ. |
| Capacitive load tolerance | Stable with up to 30pF load when 10Ω isolation resistor is added-critical for driving scope probes and long PCB traces. |
| Low-cost precision speed | Delivers 90MHz GBW and 450V/µs slew rate at <1/3 the price of comparable high-speed op-amps like LT1363 or LT1813. |
Applications
| Video Cable Driver | Fast Integrator |
|---|---|
|
Use Scenario: Driving 75Ω coaxial cable between video switcher and monitor in broadcast production equipment. IC Role / Device Role / Timing Role: Final-stage buffer and level shifter delivering 7.5VP-P signal with <0.1% gain flatness to 100MHz. Use Value: Eliminates need for external line drivers or transformers; double termination preserves signal integrity without reflections. |
Use Scenario: Precision integration of pulsed laser diode current feedback in medical imaging systems. IC Role / Device Role / Timing Role: High-linearity integrator with 110ns settling enabling sub-microsecond pulse width measurement. Use Value: Maintains accuracy across wide dynamic range due to 20V/mV open-loop gain and low input bias current (±0.5µA). |
| Pulse Amplifier | D/A Current-to-Voltage Converter |
|
Use Scenario: Amplifying TTL/CMOS logic pulses for high-speed test instrumentation triggering. IC Role / Device Role / Timing Role: Low-jitter pulse conditioner with 2.2ns propagation delay and <25% overshoot at 10%–90% edges. Use Value: Preserves edge fidelity for timing-critical applications where rise time <1.25ns (AV = 1) is mandatory. |
Use Scenario: Converting 12-bit DAC current output to ±3V analog signal in industrial PLC analog output modules. IC Role / Device Role / Timing Role: Precision I-to-V converter with 2pF input capacitance minimizing settling degradation from DAC capacitance. Use Value: Achieves 0.1% settling in 110ns even with 10pF DAC output capacitance, enabling >1MSPS update rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1363CS8 | Higher 70MHz GBW, 1000V/µs slew rate, lower 7.5mA IS, but no shutdown pin and higher cost. | Lacks integrated shutdown; unsuitable for video MUX or power-gated signal paths requiring rapid enable/disable. | Select LT1363CS8 only when absolute speed >450V/µs is required and shutdown functionality is implemented externally. |
| LT1813CS8 | 100MHz GBW, 750V/µs slew rate, 3.6mA IS, rail-to-rail output, but no BAL pins and narrower input CMR (1.2V to VS–1.2V). | Cannot replace LT1191CN8 in ±5V dual-supply video systems requiring full rail input swing or offset nulling. | Choose LT1813CS8 for single-supply, low-quiescent-current, high-speed applications where offset trim and wide CMR are not needed. |
Compared with LT1363CS8 and LT1813CS8, the LT1191CN8 uniquely combines video-grade differential error specs, integrated shutdown, offset nulling, and ±5V compatibility at lower cost-making it irreplaceable in legacy broadcast and industrial analog video infrastructure.
Availability
LT1191CN8 is available at Aetrix Electronics and suitable for broadcast video routing, high-speed test instrumentation, industrial analog signal conditioning, and medical imaging subsystems requiring stable component supply across extended product lifecycles.
Supply support for LT1191CN8 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 and manufacturing continuity for legacy Linear op-amps including the LT1191 family.
The LT1191 product line was designed specifically for cost-sensitive, high-fidelity analog video signal processing-including cable driving, MUX buffering, and fast pulse conditioning-where speed, DC precision, and robustness coexist.
FAQ
What is the maximum capacitive load the LT1191CN8 can drive without instability?
The LT1191CN8 remains stable with up to 30pF capacitive load when a 10Ω isolation resistor is placed in series with the output. Without this resistor, oscillation may occur due to phase margin degradation-especially in inverting configurations where stray capacitance at the inverting input interacts with feedback resistance. For probe or cable driving, always use the 10Ω resistor unless layout and layout parasitics are rigorously controlled. The LT1191CN8 datasheet confirms this behavior in TA11 and TA12 test circuits.
Does the LT1191CN8 support single-supply operation, and what is its input common-mode range?
Yes, the LT1191CN8 operates from a single +5V supply with input common-mode voltage range from –2.5V to +3.5V and output swing of ±3.7V into 1kΩ. This allows direct interfacing with ground-referenced sensors or DACs without level-shifting circuitry. The input stage is fully rail-to-rail capable on the negative side, enabling accurate handling of signals near 0V-a key advantage over many competing high-speed op-amps that require ≥1.5V headroom.
How does the shutdown feature of the LT1191CN8 behave under load, and what is its turn-off time?
When Pin 5 is pulled to V–, the LT1191CN8 enters shutdown with output impedance rising to 15kΩ in parallel with feedback resistors and supply current dropping to 1.4mA typical. Turn-off time is 400ns into a 1kΩ load, as verified in TA10 waveform capture. Under no-load (open-circuit), the output decays slowly toward ground due to internal leakage-confirming true high-Z behavior. This makes the LT1191CN8 ideal for video multiplexing where fast, low-distortion channel switching is required.
What are the differential gain and phase error specifications of the LT1191CN8, and under what conditions do they apply?
The LT1191CN8 achieves 0.07% differential gain error and 0.02° differential phase error at 3.58MHz (NTSC standard) with RL = 1kΩ, as stated in the "Features" section and confirmed in Note 7 of the Electrical Characteristics table. These values degrade to 0.15% and 0.09° when driving 150Ω loads-relevant for professional video distribution. Both metrics were measured under standard video conditions and directly validate suitability for RGB, Y/C, and composite video signal chains without external correction.
Can the LT1191CN8 be used in inverting configurations with the shutdown pin active?
No-the LT1191CN8 must be used in noninverting configurations when implementing multiplexing or power-gating via the shutdown pin. In inverting topologies, the input signal couples directly to the output through the feedback network even during shutdown, violating the high-Z requirement. The datasheet explicitly states this limitation in the "Using the Shutdown Feature" section and illustrates the issue in TA09–TA10 waveforms. For inverting applications requiring shutdown, external analog switches or separate enable logic are necessary.
LT1191CN8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Applications:
- General Purpose
- Output Type:
- -
- Number of Circuits:
- 1
- -3db Bandwidth:
- -
- Slew Rate:
- 450V/µs
- Current - Supply:
- 32 mA
- Current - Output / Channel:
- 50 mA
- Voltage - Supply, Single/Dual (±):
- 4.75V ~ 16V, ±2.38V ~ 8V
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-PDIP
LT1191CN8 FAQ
1.How can I place an order for LT1191CN8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1191CN8 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 LT1191CN8 reliable?
The price and inventory of LT1191CN8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1191CN8 is usually 5 days.
3.What payment methods are accepted for LT1191CN8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1191CN8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1191CN8?
LT1191CN8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1191CN8 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 LT1191CN8?
For technical support, including LT1191CN8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1191CN8 requirements.
6.How does Aetrix verify that LT1191CN8 is sourced from the original manufacturer or authorized distributors?
All LT1191CN8 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 LT1191CN8 meets industry standards.
7.What is the process for return or replacement of LT1191CN8?
All LT1191CN8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1191CN8, 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 LT1191CN8 part is unused and in its original packaging.
Return procedure for LT1191CN8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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