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Analog Devices Inc. LT1222IS8
- Part No.:
- LT1222IS8
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1222IS8.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,864
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Product details
Overview
LT1222IS8 from Analog Devices (formerly Linear Technology) is a high-speed, low-noise, precision operational amplifier in an 8-lead SOIC package, featuring 500MHz gain-bandwidth, 200V/μs slew rate, and 3nV/√Hz input voltage noise. It operates stably at noise gain ≥10 without external compensation and supports output clamping via its dedicated COMP pin. It is widely used in high-fidelity video amplification, data acquisition buffers, and RF signal conditioning circuits.
For engineers reviewing the LT1222IS8 datasheet, LT1222IS8 pinout, LT1222IS8 application, or LT1222IS8 equivalent, key selection considerations include its uncompensated stability at AV ≥10, C-load drive capability, external compensation flexibility, ±12V output swing into 500Ω, and guaranteed –40°C to +85°C industrial temperature operation.
Technical Context
The LT1222IS8 employs a single-stage complementary bipolar architecture with proprietary DC gain enhancement, enabling both high speed (500MHz GBW) and precision (≤300μV VOS, ≤300nA IB). Its internal compensation node (Pin 5) allows bandwidth/slew-rate trade-offs via external capacitor, while bias current cancellation ensures matched input bias and offset currents.
It achieves fast settling (75ns to 0.1%, 120ns to 0.01%) and low distortion (0.4% differential gain, 0.1° differential phase at 3.58MHz), making it suitable for 10–12-bit data acquisition and composite video signal paths where fidelity and timing accuracy are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 500MHz - Enables 5MHz bandwidth at noise gain of 100; supports wideband closed-loop designs without instability. |
| Slew Rate | 200V/μs - Supports full-scale 10V transitions in under 50ns; essential for fast pulse and video signal fidelity. |
| Input Voltage Noise | 3nV/√Hz - Low-noise performance preserves SNR in sensor front-ends and precision gain stages. |
| Input Offset Voltage | Max 300μV - Enables accurate DC-coupled amplification in instrumentation and calibration circuits. |
| Output Swing | ±12V into 500Ω - Delivers rail-to-rail usable dynamic range with standard ±15V supplies. |
| Settling Time (0.1%) | 75ns for 10V step - Meets timing requirements of 10-bit ADC drivers and high-speed multiplexed systems. |
| Common-Mode Rejection | 100–120dB - Rejects supply and ground noise in noisy industrial environments. |
Pinout & Package
LT1222IS8 is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC dimensions (body width 3.9mm, lead pitch 1.27mm). Thermal resistance θJA = 190°C/W enables operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V+) | Positive Supply | Accepts +4.5V to +18V; must be bypassed with 0.1μF ceramic capacitor near pin. |
| 2 (–IN) | Inverting Input | Differential input node; high impedance (≥20MΩ); bias current ≤300nA. |
| 3 (+IN) | Noninverting Input | Differential input node; matched bias current to Pin 2 enables zero-impedance error cancellation. |
| 4 (V–) | Negative Supply | Accepts –4.5V to –18V; symmetric dual-supply operation required for full output swing. |
| 5 (COMP) | Compensation Node | Internal gain-stage node; external capacitor adjusts bandwidth/slew rate; also enables output clamping. |
| 6 (VOUT) | Amplifier Output | Capable of ±12V swing into 500Ω; drives >24mA; stable with ≥1000pF capacitive loads. |
| 7 (NULL) | Offset Null Connection | Unused in standard configurations; tied to V– or left open per layout guidelines. |
| 8 (NULL) | Unused Terminal | No internal connection; electrically isolated; recommended to tie to V– for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Stable at noise gain ≥10 | Eliminates need for external compensation in most high-gain applications, reducing component count and board area. |
| External compensation pin (Pin 5) | Enables precise bandwidth/slew-rate tuning and output clamping-no additional op-amps or diodes required. |
| C-load drive capability | Stable driving of coaxial cables and ADC input capacitance (up to 10,000pF), avoiding peaking or oscillation. |
| Bias current cancellation | Matches input bias and offset currents (≤300nA), removing need for input impedance balancing resistors. |
| Low distortion at video frequencies | 0.4% differential gain / 0.1° differential phase at 3.58MHz ensures broadcast-quality NTSC/PAL signal integrity. |
Applications
| Video Signal Amplification | Data Acquisition Buffering |
|---|---|
Use Scenario: Amplifying composite video signals (NTSC/PAL) in broadcast equipment and medical imaging displays. IC Role / Device Role / Timing Role: High-fidelity voltage amplifier with unity or low-noise-gain configuration, preserving luminance/chrominance timing alignment. Use Value: 0.4% differential gain and 0.1° differential phase ensure color fidelity and minimal cross-luminance artifacts at 3.58MHz. | Use Scenario: Driving the input of 10- to 12-bit SAR or pipeline ADCs in automated test equipment and industrial PLC modules. IC Role / Device Role / Timing Role: Fast-settling buffer isolating multiplexer output from ADC sampling capacitance. Use Value: 75ns settling to 0.1% guarantees accurate sampling of 10V full-scale steps within one ADC conversion cycle. |
| Cable Driver | RF Signal Conditioning |
Use Scenario: Driving 75Ω coaxial video or analog sensor cables up to 10m in security camera systems and machine vision interfaces. IC Role / Device Role / Timing Role: Impedance-matched line driver with controlled slew and low output impedance (<0.1Ω). Use Value: Direct 75Ω series termination capability maintains signal integrity and minimizes reflections without external components. | Use Scenario: Intermediate frequency (IF) amplification in SDR receivers and spectrum analyzers operating up to 50MHz. IC Role / Device Role / Timing Role: Wideband gain block with flat frequency response and low additive noise. Use Value: 3nV/√Hz input noise and 500MHz GBW support high dynamic range and resolution in narrowband IF chains. |
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 |
|---|---|---|---|
| LT1220CN8 | Unity-gain stable; lower GBW (45MHz); higher slew rate (250V/μs); no COMP pin. | Preferred for AV = 1–2 applications (e.g., transimpedance amps); unsuitable for AV ≥10 without added stability risk. | Select LT1220CN8 only when unity-gain operation is mandatory and bandwidth <50MHz suffices. |
| LT1221CS8 | Stable at AV ≥4; GBW = 150MHz; same slew rate (250V/μs); no COMP pin; identical SOIC-8 footprint. | Balances speed and stability for medium-gain (4–10) video and instrumentation; lacks external compensation flexibility. | Choose LT1221CS8 when noise gain is 4–9 and external bandwidth tuning is unnecessary. |
Compared with LT1222IS8, LT1220CN8 trades bandwidth and compensation control for unconditional unity-gain stability, while LT1221CS8 offers reduced GBW but broader stable gain range and identical packaging-neither provides the LT1222IS8's combination of 500MHz bandwidth, AV ≥10 stability, and programmable compensation.
Availability
LT1222IS8 is available at Aetrix Electronics and suitable for video signal amplification, high-speed data acquisition buffering, and RF signal conditioning requiring stable component supply across industrial temperature ranges.
Supply support for LT1222IS8 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 product support, manufacturing, and documentation for legacy Linear parts including the LT1222 family.
The LT1222IS8 belongs to Linear Technology's high-speed precision op-amp product line, designed specifically for applications demanding simultaneous wide bandwidth, low noise, fast settling, and robust capacitive load drive-especially in video, instrumentation, and data acquisition systems.
FAQ
What is the operating temperature range for the LT1222IS8?
The LT1222IS8 is specified for industrial operation from –40°C to +85°C. This range is fully tested and guaranteed-not just characterized-making it suitable for harsh environments such as factory automation, outdoor video systems, and industrial data loggers. The "I" grade designation explicitly confirms this extended temperature qualification, unlike the commercial-grade LT1222CN8.
Can the LT1222IS8 drive a 75Ω coaxial cable directly?
Yes, the LT1222IS8 can drive a 75Ω coaxial cable directly. For optimal pulse fidelity, place a 75Ω series resistor at the output (Pin 6) and terminate the far end with a 75Ω resistor to ground. This configuration prevents reflections and preserves rise time, leveraging the LT1222IS8's low output impedance (<0.1Ω) and 200V/μs slew rate to maintain signal integrity over distances up to 10 meters.
Does the LT1222IS8 require external compensation for gain-of-10 operation?
No, the LT1222IS8 is unconditionally stable at noise gains of 10 or greater without any external compensation. This is a defining feature confirmed in the datasheet's Electrical Characteristics and Applications Information sections. External compensation (via Pin 5) is optional and used only when lower noise gains (e.g., AV = –1 or AV = 5) or bandwidth limiting are required.
What is the purpose of Pin 5 (COMP) on the LT1222IS8?
Pin 5 is the internal compensation node of the LT1222IS8. It serves two primary functions: (1) adding an external capacitor to adjust bandwidth and slew rate for specific closed-loop gain requirements, and (2) connecting back-to-back Schottky diodes to clamp the output swing (e.g., to ±0.5V). This dual-use node eliminates the need for external clamping circuitry in settling-time measurement setups or overvoltage protection schemes.
How does the LT1222IS8 compare to the LT1221 in terms of stability and bandwidth?
The LT1222IS8 is stable only at noise gains ≥10 and delivers 500MHz GBW, whereas the LT1221 is stable at noise gains ≥4 and offers 150MHz GBW. Thus, the LT1222IS8 supports higher closed-loop bandwidth at high gains (e.g., 5MHz at AV = 100), while the LT1221 provides greater flexibility for medium-gain applications (AV = 4–9) with improved phase margin and no need for external compensation-making them complementary, not interchangeable, solutions.
LT1222IS8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- C-Load™
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Amplifier Type:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 200V/µs
- Gain Bandwidth Product:
- 500 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 nA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 8mA
- Current - Output / Channel:
- 26 mA
- Voltage - Supply Span (Min):
- 10 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1222IS8 FAQ
1.How can I place an order for LT1222IS8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1222IS8 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 LT1222IS8 reliable?
The price and inventory of LT1222IS8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1222IS8 is usually 5 days.
3.What payment methods are accepted for LT1222IS8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1222IS8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1222IS8?
LT1222IS8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1222IS8 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 LT1222IS8?
For technical support, including LT1222IS8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1222IS8 requirements.
6.How does Aetrix verify that LT1222IS8 is sourced from the original manufacturer or authorized distributors?
All LT1222IS8 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 LT1222IS8 meets industry standards.
7.What is the process for return or replacement of LT1222IS8?
All LT1222IS8 units undergo pre-shipment inspection (PSI). If there is an issue with LT1222IS8, 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 LT1222IS8 part is unused and in its original packaging.
Return procedure for LT1222IS8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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