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Analog Devices Inc. LT1191CS8
- Part No.:
- LT1191CS8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Video Amps and Modules
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1191CS8.pdf
- Description:
- IC AMP GENERAL PURPOSE 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,587
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Product details
Overview
LT1191CS8 from Analog Devices (formerly Linear Technology) is an ultrahigh-speed voltage-feedback operational amplifier optimized for ±5V and single 5V supply operation, delivering 450 V/µs slew rate, 90 MHz gain bandwidth product, ±50 mA output drive, and 110 ns settling time to 0.1%, primarily used in video cable drivers and fast signal conditioning circuits.
For engineers reviewing the LT1191CS8 datasheet, LT1191CS8 pinout, LT1191CS8 application, or LT1191CS8 equivalent, this page provides verified circuit role, package mapping, real-world performance boundaries, shutdown behavior, and validated alternatives for video, pulse, and DAC I/V conversion designs.
Technical Context
The LT1191CS8 employs a unity-gain-stable voltage-feedback architecture with high open-loop gain (>20 V/mV at 1 kΩ load) and full-power bandwidth of 20 MHz at 7 VP-P. Its internal compensation enables stable operation at AV = 1 while maintaining phase margin >34° across temperature.
It integrates a dedicated shutdown terminal (Pin 5) that reduces supply current to 1.4–2.1 mA and output impedance to 15 kΩ || feedback network, enabling true high-impedance state for multiplexed video routing without signal coupling through feedback paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 90 MHz - supports closed-loop gains ≥1 with usable bandwidth up to 90 MHz at low noise gain. |
| Slew Rate | 450 V/µs - enables clean 7 VP-P output at 20 MHz full-power bandwidth into 1 kΩ load. |
| Settling Time | 110 ns to 0.1% - meets broadcast video timing requirements for NTSC/PAL composite signals. |
| Differential Gain/Phase Error | 0.07% / 0.02° at RL = 1 kΩ - ensures minimal color fidelity distortion in analog video transmission. |
| Output Current | ±50 mA - drives 75 Ω double-terminated coaxial cable (150 Ω total load) with 6 dB gain compensation. |
| Shutdown Supply Current | 1.4–2.1 mA - reduces power by >95% vs active mode (32–38 mA), enabling low-quiescent multiplexing. |
| Input Noise Voltage | 25 nV/√Hz at 10 kHz - preserves SNR in baseband video and pulse amplification applications. |
Pinout & Package
LT1191CS8 is housed in an 8-lead plastic SOIC (SO-8) package with standard op-amp pinout and JEDEC MS-012AC footprint. Pin 5 is dedicated to shutdown control and must be tied to V– to activate low-power state.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (BAL) | Offset Null Terminal | Connects to wiper of 1 kΩ–10 kΩ potentiometer for input offset adjustment over ±100 mV range. |
| 2 (–IN) | Inverting Input | High-impedance node (70 kΩ differential, 5 MΩ common-mode); sensitive to stray capacitance-keep trace short. |
| 3 (+IN) | Noninverting Input | DC-coupled input with ±2.5 V to +3.5 V common-mode range on ±5 V supplies; requires matched layout for CMRR. |
| 4 (V–) | Negative Supply Rail | Reference for shutdown logic; Pin 5 must be driven to V– (not ground) for reliable turn-off at elevated temperatures. |
| 5 (SHDN) | Shutdown Control | Active-low enable: pulls output to high-Z (15 kΩ || feedback) and cuts supply current to ≤2.1 mA. |
| 6 (OUT) | Amplifier Output | Capable of ±3.7 V swing into 1 kΩ on ±5 V; drives 75 Ω loads directly with <0.1% differential gain error. |
| 7 (V+) | Positive Supply Rail | Accepts single 5 V or dual ±5 V; bypassing with 0.1 µF ceramic + 4.7 µF tantalum minimizes settling tail to 143 ns. |
| 8 (BAL) | Offset Null Terminal | Second null terminal; used with Pin 1 to form balanced offset trim network per datasheet Figure TA03. |
Key Features
| Feature | Design Value |
|---|---|
| Video-optimized distortion performance | 0.07% differential gain / 0.02° differential phase error at 3.58 MHz NTSC ensures broadcast-grade color fidelity. |
| True high-impedance shutdown | Output disconnects to 15 kΩ || external feedback resistors-prevents signal leakage in MUX configurations. |
| Single-supply 5 V operation | Operates with V+ = 5 V, V– = 0 V and input common-mode range centered at 2.5 V, simplifying interface to CMOS logic. |
| Robust capacitive load drive | Stable with up to 30 pF load; 10 Ω isolation resistor restores stability when driving scope probes or long traces. |
| Low-cost high-speed solution | Delivers 90 MHz GBW and 450 V/µs slew at <1/3 the cost of comparable 100+ MHz amplifiers like LT1813. |
Applications
| Video Cable Driver | Fast Pulse Amplifier |
|---|---|
|
Use Scenario: Driving 75 Ω coaxial cable in broadcast equipment with double termination (75 Ω series + 75 Ω shunt). IC Role / Device Role / Timing Role: Voltage buffer with 6 dB gain compensation and 100 MHz –3 dB bandwidth into 150 Ω load. Use Value: Eliminates reflections and preserves rise/fall times below 1.25 ns for SD/HD video sync pulses. |
Use Scenario: Amplifying TTL/CMOS logic edges for test instrumentation requiring sub-2 ns propagation delay. IC Role / Device Role / Timing Role: High-fidelity pulse amplifier with 2.2 ns tPD, 100–130 ns rise/fall (20–80%), and <25% overshoot. Use Value: Maintains edge integrity for 50 MHz digital clock distribution without added jitter or duty-cycle distortion. |
| D/A Current-to-Voltage Converter | Fast Integrator |
|
Use Scenario: Converting 0–20 mA or 4–20 mA industrial loop currents to precise voltage outputs in PLC analog modules. IC Role / Device Role / Timing Role: Transimpedance amplifier with ±50 mA input compliance and 110 ns settling to 0.1% step response. Use Value: Enables <100 µs update rates for 12-bit DACs while rejecting noise from long sensor cables. |
Use Scenario: Precision integration of fast transients in oscilloscope front-ends and energy measurement systems. IC Role / Device Role / Timing Role: Unity-gain integrator with 90 MHz GBW limiting integrator drift and enabling wide dynamic range. Use Value: Supports integration time constants down to 10 ns with <0.01% nonlinearity over 10 V output swing. |
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 |
|---|---|---|---|
| LT1813CS8 | Higher GBW (100 MHz), faster slew rate (750 V/µs), lower supply current (3.6 mA), but no shutdown pin. | Lacks integrated shutdown; requires external MOSFET switch for power gating-adds board area and complexity. | Choose LT1813CS8 only when maximum speed is critical and shutdown functionality is implemented externally. |
| LMH6702MA/NOPB | Similar GBW (1.7 GHz small-signal, 700 MHz large-signal), higher slew (3200 V/µs), no shutdown, higher quiescent current (12.5 mA). | Optimized for RF/IF signal chains-not characterized for video differential gain/phase or cable driver linearity. | Prefer LMH6702MA/NOPB for wideband IF amplification above 50 MHz where video specs are irrelevant. |
Compared with LT1191CS8, LT1813CS8 trades shutdown capability for higher speed and lower power, while LMH6702MA/NOPB delivers RF-grade bandwidth at the expense of video-specific linearity validation and integrated power control.
Availability
LT1191CS8 is available at Aetrix Electronics and suitable for video signal processing, fast pulse amplification, and D/A current-to-voltage conversion requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for LT1191CS8 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 products including the LT1191 family.
The LT1191 series was designed specifically for cost-sensitive, high-fidelity analog video infrastructure-emphasizing differential gain/phase accuracy, cable drive strength, and shutdown-enabled multiplexing in broadcast and instrumentation systems.
FAQ
What is the maximum load capacitance the LT1191CS8 can drive without instability?
The LT1191CS8 remains stable with up to 30 pF capacitive load under standard conditions. When driving larger loads such as scope probes or long PCB traces, adding a 10 Ω series resistor at the output restores phase margin and prevents ringing, as confirmed in Typical Performance Characteristic TPC22 and Application Note TA11.
Can the LT1191CS8 operate from a single 5V supply, and what are the input/output voltage limits?
Yes, the LT1191CS8 supports single 5V operation (V+ = 5V, V– = 0V) with input common-mode range from 2 V to 3.5 V and output swing of 0.25 V to 3.8 V into 100 Ω. These values are specified in the LT1191C electrical characteristics table for single-supply conditions and validated in TPC17 and TPC18.
How does the shutdown feature of the LT1191CS8 behave under heavy load?
When Pin 5 is pulled to V–, the LT1191CS8 achieves full shutdown in 400 ns with a 1 kΩ load, reducing output current to microamps and presenting a 15 kΩ || feedback impedance. This behavior is measured and documented in the Electrical Characteristics table (tOFF = 400 ns) and illustrated in TA10.
Is the LT1191CS8 pin-compatible with other SO-8 op-amps like the LT1028 or OP27?
No-the LT1191CS8 uses a nonstandard SO-8 pinout with BAL pins at 1 and 8, SHDN at Pin 5, and no power-down or compensation terminals elsewhere. LT1028 and OP27 follow industry-standard SO-8 op-amp pinouts (e.g., V– at 4, V+ at 7, OUT at 6), making them mechanically incompatible without PCB redesign.
What is the typical differential phase error of the LT1191CS8 at NTSC frequencies?
The LT1191CS8 exhibits 0.02° differential phase error at 3.58 MHz NTSC with RL = 1 kΩ, as specified in the Features list and confirmed in Note 7 of the Electrical Characteristics table. This value is measured under standard video conditions and ensures minimal hue shift in composite video systems.
LT1191CS8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- 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:
- Surface Mount
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 8-SO
LT1191CS8 FAQ
1.How can I place an order for LT1191CS8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1191CS8 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 LT1191CS8 reliable?
The price and inventory of LT1191CS8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1191CS8 is usually 5 days.
3.What payment methods are accepted for LT1191CS8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1191CS8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1191CS8?
LT1191CS8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1191CS8 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 LT1191CS8?
For technical support, including LT1191CS8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1191CS8 requirements.
6.How does Aetrix verify that LT1191CS8 is sourced from the original manufacturer or authorized distributors?
All LT1191CS8 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 LT1191CS8 meets industry standards.
7.What is the process for return or replacement of LT1191CS8?
All LT1191CS8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1191CS8, 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 LT1191CS8 part is unused and in its original packaging.
Return procedure for LT1191CS8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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