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Analog Devices Inc. LT1222CN8#PBF
- Part No.:
- LT1222CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1222CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,488
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Product details
Overview
LT1222CN8#PBF from Analog Devices (formerly Linear Technology) is a high-speed, low-noise voltage-feedback operational amplifier optimized for precision wideband applications. It delivers 500MHz gain-bandwidth, 200V/μs slew rate, and 3nV/√Hz input voltage noise at 10kHz, with stable operation at noise gain ≥10. It is used in 10-bit data acquisition systems, video line drivers, and active filter stages requiring fast settling (75ns to 0.1%) and ±12V output swing into 500Ω.
For engineers reviewing the LT1222CN8#PBF datasheet, LT1222CN8#PBF pinout, LT1222CN8#PBF application, or LT1222CN8#PBF equivalent, key selection criteria include uncompensated stability at AV ≥10, external compensation capability via Pin 5, C-load drive capability, differential gain/phase performance (0.4%/0.1°), and DC precision (300μV max VOS, 300nA max IB).
Technical Context
The LT1222CN8#PBF employs a single-stage complementary bipolar architecture with proprietary DC gain enhancement, enabling both high speed and low offset. Its internal compensation node (Pin 5) allows flexible bandwidth/slew trade-offs and output clamping functionality - not available in unity-gain stable variants like the LT1220.
It achieves stability with capacitive loads up to 10,000pF by sensing load-induced poles and dynamically adjusting internal compensation. Unlike standard op-amps, it maintains phase margin and controlled overshoot even under heavy C-load conditions, making it suitable for coaxial cable driving without external isolation resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 500MHz - Enables 5MHz bandwidth at noise gain = 100; supports high-resolution signal conditioning in fast ADC front-ends. |
| Slew Rate | 200V/μs - Supports full-scale 10V step settling in ≤75ns to 0.1%, critical for 10-bit+ sampling systems. |
| Input Voltage Noise | 3nV/√Hz @ 10kHz - Low-noise performance preserves SNR in preamplifier and sensor interface stages. |
| Input Offset Voltage | 300μV max - Enables accurate DC-coupled amplification in instrumentation-grade signal chains. |
| Output Swing | ±12V into 500Ω - Delivers rail-to-rail usable dynamic range with 50Ω/75Ω termination compatibility. |
| Settling Time | 120ns to 0.01% - Meets timing requirements for 8–12-bit data acquisition with minimal aperture error. |
| Differential Gain/Phase | 0.4% / 0.1° @ AV=2, RL=150Ω - Validated for composite video buffering and broadcast-quality signal paths. |
Pinout & Package
LT1222CN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300″ width, rated for 0°C to 70°C operation (commercial grade). Thermal resistance θJA = 130°C/W. Lead finish is lead-free (Pb-free) per RoHS.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Null) | Offset Null Adjustment | Connects to internal VOS trimming network; unused in most applications but enables fine DC calibration. |
| 2 (–IN) | Inverting Input | Differential input terminal; high-impedance (45MΩ), low-bias-current (300nA max) node for feedback networks. |
| 3 (+IN) | Noninverting Input | Differential input terminal; matched bias current and impedance to –IN for minimized common-mode error. |
| 4 (V–) | Negative Supply Rail | Accepts –15V nominal; absolute max –18V; supports dual-supply operation down to ±5V. |
| 5 (Comp) | External Compensation Node | Access point for adding capacitor to ground; adjusts bandwidth, slew rate, and peaking - enables AV < 10 operation. |
| 6 (VOUT) | Amplifier Output | Capable of sourcing/sinking 26mA; drives 500Ω loads to ±12V; supports clamping via back-to-back Schottky diodes on Pin 5. |
| 7 (V+) | Positive Supply Rail | Accepts +15V nominal; absolute max +18V; total supply voltage ≤36V across V+ and V–. |
| 8 (Null) | Offset Null Adjustment | Second null terminal; used with Pin 1 for 4-terminal VOS trim (typically 10kΩ potentiometer between Pins 1/8, wiper to V–). |
Key Features
| Feature | Design Value |
|---|---|
| Noise gain ≥10 stability | Operates unconditionally stable without external compensation - eliminates need for feedback capacitor in AV=10+ circuits. |
| C-load drive capability | Stable with up to 10,000pF capacitive load; enables direct coaxial cable driving (e.g., 75Ω video lines) without series isolation. |
| External compensation pin | Pin 5 allows bandwidth reduction, slew rate control, and output clamping - adds design flexibility absent in fixed-compensation op-amps. |
| Low distortion video performance | 0.4% differential gain / 0.1° differential phase at 3.58MHz meets NTSC/PAL broadcast standards for analog video routing. |
| High DC precision | 300μV max VOS and 300nA max IB enable accurate DC-coupled gain stages without auto-zero or chopper assistance. |
Applications
| Video Line Driver | Data Acquisition Front-End |
|---|---|
Use Scenario: Driving 75Ω coaxial cable in broadcast video equipment with minimal signal degradation. IC Role / Device Role / Timing Role: High-fidelity buffer amplifier operating at AV = 2, f = 3.58MHz, with C-load stability and low differential distortion. Use Value: Maintains 0.4% differential gain and 0.1° phase error - preserving color fidelity and sync integrity over long cable runs. |
Use Scenario: Amplifying sensor outputs prior to 10-bit SAR ADC sampling at 1 MSPS. IC Role / Device Role / Timing Role: Fast-settling gain stage with 75ns to 0.1% and ±12V swing into 500Ω load. Use Value: Enables full-scale 10V step acquisition within one ADC conversion period, minimizing aperture uncertainty. |
| Active Filter Stage | High-Speed Instrumentation Amplifier Core |
Use Scenario: Implementing 3rd-order Sallen-Key low-pass filter at 5MHz cutoff for anti-aliasing. IC Role / Device Role / Timing Role: Unity-gain stable buffer (AV ≥10 configuration) with 500MHz GBW ensuring flat passband response. Use Value: Achieves >60dB stopband attenuation at 15MHz while maintaining group delay linearity across 0–5MHz. |
Use Scenario: Building two-op-amp instrumentation amplifier for medical ECG front-end with 1001× gain. IC Role / Device Role / Timing Role: Precision gain block (AV = 1001) using LT1222CN8#PBF in second stage, leveraging low VOS and high CMRR (120dB). Use Value: Delivers <10μV offset contribution and 100dB minimum CMRR at 60Hz - meeting IEC 60601-2-27 ECG accuracy requirements. |
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#PBF | Unity-gain stable; lower GBW (45MHz); higher slew rate (250V/μs); no external compensation pin. | Required where AV = 1 or AV = 2 configurations dominate; unsuitable for AV ≥10 uncompensated use cases. | Select when circuit requires unconditional stability at AV = 1 and does not need Pin 5 clamping or C-load drive. |
| LT1221CS8#PBF | Stable at AV ≥4; GBW = 150MHz; same SOIC-8 package; no Pin 5 compensation node; 250V/μs slew rate. | Used in mid-bandwidth applications (e.g., 12-bit DAC buffers) where 500MHz is excessive and SOIC footprint is preferred. | Select for space-constrained PCBs needing AV ≥4 stability and reduced bandwidth/power vs. LT1222CN8#PBF. |
Compared with LT1220CN8#PBF and LT1221CS8#PBF, the LT1222CN8#PBF uniquely offers 500MHz GBW with uncompensated AV ≥10 stability and a configurable compensation node - making it the only choice among the three for high-gain, high-fidelity, C-load-tolerant designs.
Availability
LT1222CN8#PBF is available at Aetrix Electronics and suitable for video line driving, 10-bit data acquisition systems, and active filter design requiring stable component supply across commercial temperature range (0°C to 70°C).
Supply support for LT1222CN8#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 acquired Linear Technology in 2017 and maintains full product support, documentation, and manufacturing continuity for legacy Linear parts including the LT1222 family.
The LT1222CN8#PBF belongs to Linear Technology's high-speed precision op-amp product line, designed specifically for applications demanding simultaneous wide bandwidth, low noise, low distortion, and robust capacitive-load drive capability.
FAQ
What is the maximum capacitive load the LT1222CN8#PBF can drive stably?
The LT1222CN8#PBF is stable with capacitive loads up to 10,000pF, as verified in typical performance curves (TPC21). At this load, large-signal slew rate degrades to ~4V/μs due to output short-circuit current limiting, but phase margin remains sufficient to prevent oscillation. For optimal pulse fidelity with coaxial cables, a 75Ω series resistor is recommended at the output.
Does the LT1222CN8#PBF require external compensation for AV = 10 operation?
No - the LT1222CN8#PBF is unconditionally stable at noise gains of 10 or greater without any external compensation. This is a defining feature confirmed in the Applications Information section and Electrical Characteristics table. External compensation via Pin 5 is optional and used only when reducing gain below AV = 10 or tailoring transient response.
Can the LT1222CN8#PBF be used in single-supply configurations?
Yes, the LT1222CN8#PBF supports single-supply operation with input common-mode range extending to V– (including ground) and output swing within 2V of rails. When operated from +30V and ground, it delivers >±12V output swing into 500Ω, provided the input signal stays within the specified common-mode range (–13V to +14V referenced to V–).
What is the purpose of Pin 5 (Comp) on the LT1222CN8#PBF?
Pin 5 provides access to the internal compensation node, enabling three functions: (1) bandwidth reduction via capacitor-to-ground, (2) slew rate adjustment (SR ≈ 1.2mA/(CC + 6pF)), and (3) output voltage clamping using back-to-back Schottky diodes. This pin is unique to the LT1222CN8#PBF within its family and is not present on LT1220 or LT1221.
How does the LT1222CN8#PBF compare to the LT1221 in terms of gain stability?
The LT1222CN8#PBF is stable at noise gain ≥10, whereas the LT1221 requires noise gain ≥4. This means the LT1222CN8#PBF supports higher closed-loop gains without compensation, offering superior phase margin in high-gain configurations (e.g., AV = 100). The LT1221's lower minimum gain requirement makes it more flexible for mid-gain applications but sacrifices ultimate bandwidth scalability.
LT1222CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- C-Load™
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1222CN8#PBF FAQ
1.How can I place an order for LT1222CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1222CN8#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 LT1222CN8#PBF reliable?
The price and inventory of LT1222CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1222CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1222CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1222CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1222CN8#PBF?
LT1222CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1222CN8#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 LT1222CN8#PBF?
For technical support, including LT1222CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1222CN8#PBF requirements.
6.How does Aetrix verify that LT1222CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1222CN8#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 LT1222CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1222CN8#PBF?
All LT1222CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1222CN8#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 LT1222CN8#PBF part is unused and in its original packaging.
Return procedure for LT1222CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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