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Analog Devices Inc. LT1222IS8#PBF
- Part No.:
- LT1222IS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1222IS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,499
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Product details
Overview
LT1222IS8#PBF from Analog Devices (formerly Linear Technology) is a high-speed, low-noise operational amplifier optimized for precision wideband applications. It delivers 500MHz gain-bandwidth, 200V/μs slew rate, 3nV/√Hz input voltage noise, and stable operation at noise gain ≥10 - enabling use in 10-bit to 12-bit data acquisition systems, video buffers, and RF signal conditioning stages with ±12V output swing into 500Ω.
For engineers reviewing the LT1222IS8#PBF datasheet, LT1222IS8#PBF pinout, LT1222IS8#PBF application, or LT1222IS8#PBF equivalent, key selection considerations include external compensation capability, C-load drive tolerance, clamping via COMP pin, differential gain/phase performance (0.4%/0.1°), and guaranteed –40°C to +85°C operation in SOIC-8 package.
Technical Context
The LT1222IS8#PBF employs a single-stage complementary bipolar architecture with proprietary DC gain enhancement, achieving both high speed and precision. Its internal compensation node (Pin 5) enables bandwidth/slew rate trade-offs via external capacitor, while bias current cancellation ensures matched input bias and offset currents (≤300nA max).
Stability is guaranteed at noise gain ≥10 without compensation; lower gains require external CC from Pin 5 to ground. The amplifier drives capacitive loads directly and supports output clamping using back-to-back Schottky diodes on the COMP node - a feature critical for false-sum-node settling measurements and pulse fidelity in cable driver configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 500MHz - enables 5MHz bandwidth at AV = 100, supporting high-resolution ADC front-ends. |
| Slew Rate | 200V/μs - ensures ≤120ns settling to 0.01% for 10V steps, critical for fast data acquisition. |
| Input Voltage Noise | 3nV/√Hz at 10kHz - low enough to preserve SNR in 12-bit systems with moderate source impedances. |
| Input Offset Voltage | 300μV max - supports precision DC-coupled gain stages without trimming in industrial sensor interfaces. |
| Output Swing | ±12V into 500Ω - delivers full dynamic range with standard ±15V supplies, minimizing headroom loss. |
| Differential Gain/Phase | 0.4%/0.1° at 3.58MHz - meets broadcast video linearity requirements for RGB or composite video buffering. |
| Supply Current | 10.5mA typical - balances speed and power for board-level analog signal chains requiring multiple high-fidelity amps. |
Pinout & Package
LT1222IS8#PBF is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC footprint, 1.27mm pitch, and 5.0mm × 6.2mm body size. Thermal resistance θJA = 190°C/W enables operation up to +85°C ambient without forced airflow.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (V–) | Negative supply rail | Connects to system ground or negative supply; supports ±5V to ±15V operation. |
| 2 (–IN) | Inverting input | Differential input node; high impedance (20–45MΩ) and low bias current (≤300nA). |
| 3 (+IN) | Non-inverting input | Differential input node; matched to Pin 2 for common-mode rejection >100dB. |
| 4 (COMP) | External compensation node | Access to internal gain node; adding capacitor here adjusts bandwidth, slew rate, and overshoot. |
| 5 (NULL) | Offset null connection | Unused in standard configurations; tied to V– or left open per layout guidelines. |
| 6 (VOUT) | Amplifier output | Capable of ±12V swing into 500Ω and direct drive of 75Ω coaxial cable with series termination. |
| 7 (V+) | Positive supply rail | Accepts up to +18V relative to V–; total supply voltage limited to 36V. |
| 8 (NULL) | No-connect terminal | Internally unconnected; must be left floating or grounded per PCB layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Gain stability at AV ≥ 10 | Uncompensated operation eliminates external components in fixed-gain video or instrumentation paths. |
| C-Load™ drive capability | Stable with up to 10,000pF load capacitance - enables direct interface to ADC input capacitors or long cables. |
| COMP pin clamping | Allows output swing limiting to ±0.5V using Schottky diodes - essential for accurate settling time measurement circuits. |
| Low input bias/offset current match | IB and IOS both ≤300nA - eliminates need for input impedance matching in transimpedance or differential configurations. |
| High DC gain (100V/mV) | Ensures <0.01% gain error in closed-loop configurations with feedback resistors ≤5kΩ. |
Applications
| Video Signal Buffering | Data Acquisition Front-End |
|---|---|
Use Scenario: Driving 75Ω coaxial cable in RGB or component video routing systems. IC Role / Device Role / Timing Role: High-fidelity unity-gain buffer with minimal differential gain/phase distortion. Use Value: Maintains 0.4% differential gain and 0.1° phase error at 3.58MHz, preserving color fidelity without post-processing correction. |
Use Scenario: Amplifying sensor outputs prior to 12-bit SAR ADC sampling at 1MSPS. IC Role / Device Role / Timing Role: Low-noise, fast-settling gain stage ensuring full-scale accuracy within 120ns. Use Value: 3nV/√Hz noise and 120ns 0.01% settling enable effective resolution >11.5 bits at high throughput rates. |
| Cable Driver for Test Equipment | Active Filter Stage |
Use Scenario: Output stage of automated test equipment delivering calibrated signals over 3m coaxial cables. IC Role / Device Role / Timing Role: High-slew-rate driver with controlled impedance interface and output clamping. Use Value: 200V/μs slew rate and COMP-pin clamping support precise pulse edge definition and amplitude limiting for calibration verification. |
Use Scenario: Second-order active low-pass filter in medical imaging signal chain with 5MHz cutoff. IC Role / Device Role / Timing Role: High-GBW op-amp enabling sharp roll-off and minimal group delay variation. Use Value: 500MHz GBW ensures filter Q-factor and cutoff accuracy remain stable across temperature and unit-to-unit variation. |
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; 45MHz GBW; 250V/μs slew rate; no external compensation required. | Better suited for AV = 1–2 applications (e.g., I/V conversion); lacks C-load drive and COMP pin clamping. | Select when simplicity and unity-gain stability outweigh bandwidth needs - not a drop-in replacement for LT1222IS8#PBF. |
| LT1221CS8#PBF | Stable at AV ≥ 4; 150MHz GBW; same 250V/μs slew rate; SOIC-8 package. | Lower bandwidth but higher slew rate margin at mid-gains; no COMP pin access for clamping. | Choose for AV = 4–10 designs where 150MHz bandwidth suffices and clamping is unnecessary. |
Compared with LT1222IS8#PBF, LT1220CN8#PBF trades bandwidth for unconditional stability, while LT1221CS8#PBF offers intermediate gain stability and higher slew rate but omits the critical COMP pin functionality needed for output clamping and fine-tuned compensation.
Availability
LT1222IS8#PBF is available at Aetrix Electronics and suitable for video signal buffering, high-speed data acquisition, and precision cable driver applications requiring stable component supply across industrial temperature ranges.
Supply support for LT1222IS8#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 technical and manufacturing continuity for legacy Linear amplifier products.
The LT1222IS8#PBF belongs to Linear's high-speed precision op-amp family, designed specifically for applications demanding simultaneous wide bandwidth, low noise, and DC accuracy - such as test instrumentation, medical imaging, and broadcast video infrastructure.
FAQ
What is the operating temperature range for LT1222IS8#PBF?
The LT1222IS8#PBF is specified for operation from –40°C to +85°C and is tested across this full industrial temperature range. This differs from the LT1222C variant (0°C to 70°C only) and ensures reliability in harsh environments like factory automation or outdoor test equipment where thermal cycling occurs.
Can LT1222IS8#PBF drive capacitive loads without oscillation?
Yes, the LT1222IS8#PBF is explicitly designed for capacitive loading via its C-Load™ architecture and remains stable with up to 10,000pF. Performance degrades gracefully: bandwidth and phase margin decrease with load, and overshoot increases - but oscillation does not occur. For 75Ω coaxial cable, add a series 75Ω resistor at the output for optimal pulse fidelity.
How is the COMP pin used in LT1222IS8#PBF?
The COMP pin (Pin 4) provides access to the internal compensation node. Connecting a capacitor from COMP to ground reduces bandwidth and slew rate while improving phase margin and reducing overshoot. For example, 20pF yields ~10.5MHz bandwidth and 46V/μs slew rate at AV = –10. This pin also enables output clamping using back-to-back Schottky diodes referenced to ground.
Is LT1222IS8#PBF pin-compatible with older Linear op-amps like HA2542 or AD847?
The LT1222IS8#PBF shares the same 8-pin SOIC footprint as HA2542 and AD847, but pin functions differ: Pin 4 is COMP (not NC), and Pin 5 is NULL (not offset null). Direct replacement requires circuit modification - especially removal of nulling networks and verification of noise gain ≥10. It is not a drop-in substitute.
What are the key differences between LT1222IS8#PBF and LT1222CS8#PBF?
The LT1222IS8#PBF and LT1222CS8#PBF share identical electrical specifications and SOIC-8 packaging, but differ in temperature grading: the 'I' grade is guaranteed from –40°C to +85°C, while the 'C' grade is only guaranteed from 0°C to 70°C (though characterized over the wider range). Both use the same die and process - only test coverage differs.
LT1222IS8#PBF 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#PBF FAQ
1.How can I place an order for LT1222IS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1222IS8#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 LT1222IS8#PBF reliable?
The price and inventory of LT1222IS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1222IS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1222IS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1222IS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1222IS8#PBF?
LT1222IS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1222IS8#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 LT1222IS8#PBF?
For technical support, including LT1222IS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1222IS8#PBF requirements.
6.How does Aetrix verify that LT1222IS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1222IS8#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 LT1222IS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1222IS8#PBF?
All LT1222IS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1222IS8#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 LT1222IS8#PBF part is unused and in its original packaging.
Return procedure for LT1222IS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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