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Analog Devices Inc. LT1221CS8#PBF
- Part No.:
- LT1221CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1221CS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:110
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Product details
Overview
LT1221CS8#PBF from Analog Devices (formerly Linear Technology) is a high-speed, precision voltage-feedback operational amplifier optimized for gain ≥4 stable operation. It delivers 150MHz gain-bandwidth, 250V/µs slew rate, 6nV/√Hz input noise, ±12V output swing into 500Ω, and 0.01% settling in 85ns - enabling use in 12-bit data acquisition systems and video signal conditioning.
For engineers reviewing the LT1221CS8#PBF datasheet, LT1221CS8#PBF pinout, LT1221CS8#PBF application, or LT1221CS8#PBF equivalent, key selection criteria include noise gain stability requirement (≥4), capacitive load drive capability (up to 10,000pF), differential gain/phase performance (0.08%/0.2° at 3.58MHz), and SOIC-8 thermal resistance (θJA = 190°C/W).
Technical Context
The LT1221CS8#PBF employs a single-stage complementary bipolar architecture with proprietary DC gain enhancement, achieving precision offset (600µV max) and bias current (300nA max) without sacrificing speed. Its internal compensation ensures stability at noise gains ≥4, distinguishing it from unity-gain-stable LT1220 or high-gain LT1222 variants.
It features C-Load™ technology that senses output pole shift under capacitive loading and applies adaptive compensation - enabling direct coaxial cable driving with 75Ω series termination while maintaining pulse fidelity and controlled overshoot (<10%).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 150MHz - supports 15MHz bandwidth at AV = 10, critical for wideband instrumentation amplifiers. |
| Slew Rate | 250V/µs - enables full-scale 10V step response within 85ns at 0.01% accuracy, suitable for fast ADC drivers. |
| Input Noise Voltage | 6nV/√Hz - low-noise performance preserves SNR in front-end amplification of sensor or video signals. |
| Output Swing | ±12V into 500Ω - delivers rail-to-rail usable dynamic range with 24mA output current, supporting active filter and buffer loads. |
| Differential Gain/Phase | 0.08%/0.2° at 3.58MHz - meets broadcast video standards (NTSC/PAL) for composite video amplification. |
| Input Offset Voltage | 600µV max - tight DC accuracy enables precision summing and transimpedance configurations without trimming. |
| Capacitive Load Drive | Stable up to 10,000pF - eliminates need for external isolation resistors in cable driver or DAC output buffer applications. |
Pinout & Package
LT1221CS8#PBF is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC footprint, 1.27mm lead pitch, and θJA = 190°C/W. The package supports surface-mount reflow and is RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - NULL | Offset Null Adjustment | Connects to external potentiometer (10kΩ) for fine-tuning input offset; unused in most applications. |
| 2 - –IN | Inverting Input | High-impedance node (45MΩ) for feedback network connection; bias current matched to +IN. |
| 3 - +IN | Noninverting Input | High-impedance node (45MΩ); input bias current cancellation eliminates need for impedance matching. |
| 4 - V– | Negative Supply Rail | Accepts –15V min; total supply voltage limited to 36V (V+ to V–); supports ±5V to ±15V operation. |
| 5 - NULL | Second Offset Null Terminal | Paired with Pin 1 for full-range nulling; left open if not used. |
| 6 - V+ | Positive Supply Rail | Accepts +15V max; common-mode input range extends to ±14V on positive rail and –13V on negative rail. |
| 7 - VOUT | Amplifier Output | Capable of sourcing/sinking 26mA; drives 500Ω loads to ±12V and 75Ω coax with series termination. |
| 8 - NC | No Connect | Internally unconnected; must remain floating - no external tie or bypass. |
Key Features
| Feature | Design Value |
|---|---|
| C-Load™ Capacitive Load Compensation | Enables stable operation with up to 10,000pF load without external compensation, simplifying cable driver PCB layout. |
| Gain ≥4 Stability | Eliminates need for external compensation networks in AV = 4, –3, or summing configurations - reduces BOM count and board area. |
| Low Input Bias Current Matching | IB+/IB– both ≤300nA with identical specs - removes requirement for input impedance balancing in precision transducer interfaces. |
| Fast Settling Time | 85ns to 0.01% for 10V step - meets timing budget for 12-bit SAR ADC sampling clocks and multiplexed data acquisition systems. |
| Video-Optimized AC Performance | Differential gain/phase <0.1%/0.25° at 3.58MHz - satisfies NTSC/PAL broadcast linearity requirements without post-amplifier correction. |
Applications
| Video Signal Amplification | Cable Driver Interface |
|---|---|
|
Use Scenario: Amplifying composite NTSC video signals in broadcast equipment before distribution to multiple monitors. IC Role / Device Role / Timing Role: High-fidelity voltage amplifier configured in noninverting gain-of-4 mode with 75Ω source and load termination. Use Value: Maintains 0.08% differential gain and 0.2° phase error at 3.58MHz, preserving color fidelity without post-processing. |
Use Scenario: Driving 75Ω coaxial cable runs (up to 100m) from FPGA video output to remote display controller. IC Role / Device Role / Timing Role: Low-output-impedance buffer with 75Ω series resistor at VOUT, leveraging C-Load™ for stability. Use Value: Delivers clean 1080p pixel clock edges with <10% overshoot and 85ns settling, eliminating eye-diagram closure. |
| 12-Bit Data Acquisition Front-End | Active Filter Stage |
|
Use Scenario: Buffering and gain-setting stage preceding a 12-bit, 1MSPS SAR ADC in industrial process monitoring. IC Role / Device Role / Timing Role: Precision gain-of-4 amplifier with 65ns 0.1% settling, synchronized to ADC sample clock. Use Value: Ensures full 12-bit accuracy by contributing <0.02 LSB of settling error during acquisition window. |
Use Scenario: Second-order Sallen-Key low-pass filter (fc = 10MHz) in RF receiver IF chain with anti-aliasing function. IC Role / Device Role / Timing Role: Unity-gain stable op-amp replaced by LT1221CS8#PBF in gain-of-4 configuration for improved stopband rejection. Use Value: Achieves >60dB attenuation at 30MHz while maintaining group delay flatness within ±0.5ns across passband. |
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); same SOIC-8 package; higher input bias current (500nA). | Required where AV = 1 or AV = 2 configurations are needed; unsuitable for AV = 4 video gain stages. | Select when circuit topology mandates unity-gain stability and bandwidth ≤45MHz suffices. |
| LT1222CS8#PBF | Higher GBW (500MHz); requires noise gain ≥10; higher supply current (12mA vs 10.5mA); same SOIC-8 footprint. | Used in AV ≥10 RF/IF amplifiers; cannot replace LT1221CS8#PBF in AV = 4 video or data acquisition roles. | Choose only when design requires >150MHz bandwidth and can support minimum noise gain of 10. |
Compared with LT1220CN8#PBF and LT1222CS8#PBF, the LT1221CS8#PBF uniquely balances 150MHz bandwidth, 4× noise gain stability, and video-grade AC linearity - making it irreplaceable in gain-of-4 composite video and 12-bit DAQ buffer roles where neither unity-gain nor high-gain alternatives meet all three constraints.
Availability
LT1221CS8#PBF is available at Aetrix Electronics and suitable for video signal conditioning, high-speed data acquisition, and active filter design requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1221CS8#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 parts including the LT1221 family.
The LT1221 belongs to Linear's high-speed precision op-amp product line, engineered specifically for applications demanding simultaneous wide bandwidth, low noise, and DC accuracy - especially in video, instrumentation, and data acquisition systems.
FAQ
What is the minimum stable noise gain for LT1221CS8#PBF?
The LT1221CS8#PBF is specified stable at noise gains of 4 or greater. This means configurations such as noninverting AV = 4, inverting AV = –3, or multi-input summing amplifiers with equivalent noise gain ≥4 operate without oscillation. Attempting unity-gain or AV = 2 configurations will cause instability and is not supported.
Can LT1221CS8#PBF drive 75Ω coaxial cable directly?
Yes - the LT1221CS8#PBF can drive 75Ω coaxial cable directly using a 75Ω series resistor at the output (VOUT), with the far end terminated to ground via another 75Ω resistor. Its C-Load™ architecture ensures stability and preserves pulse fidelity, achieving <10% overshoot and 85ns 0.01% settling for 10V steps.
What is the maximum capacitive load LT1221CS8#PBF can drive stably?
The LT1221CS8#PBF remains stable with capacitive loads up to 10,000pF, as verified in the datasheet's "Large Signal, AV = 4, CL = 10,000pF" test condition (TPC21). At this load, slew rate degrades to ~4V/µs due to output stage current limiting, but no peaking or oscillation occurs.
Does LT1221CS8#PBF require external offset nulling in precision applications?
Offset nulling is optional: the LT1221CS8#PBF has a maximum input offset voltage of 600µV, and Pin 1/5 support external nulling via a 10kΩ potentiometer. For 12-bit systems (LSB ≈ 2.4mV at ±12V), nulling is unnecessary; for 14+ bit precision, it may be applied to reduce offset to <100µV.
How does LT1221CS8#PBF compare to LT1222CS8#PBF in gain-of-4 applications?
The LT1222CS8#PBF requires minimum noise gain of 10 and becomes unstable at AV = 4. Using it in place of LT1221CS8#PBF in a gain-of-4 video amplifier will cause oscillation. The LT1221CS8#PBF is the only member of the family validated for stable operation at exactly noise gain = 4.
LT1221CS8#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:
- 250V/µs
- Gain Bandwidth Product:
- 150 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 nA
- Voltage - Input Offset:
- 200 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1221CS8#PBF FAQ
1.How can I place an order for LT1221CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1221CS8#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 LT1221CS8#PBF reliable?
The price and inventory of LT1221CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1221CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1221CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1221CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1221CS8#PBF?
LT1221CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1221CS8#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 LT1221CS8#PBF?
For technical support, including LT1221CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1221CS8#PBF requirements.
6.How does Aetrix verify that LT1221CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1221CS8#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 LT1221CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1221CS8#PBF?
All LT1221CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1221CS8#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 LT1221CS8#PBF part is unused and in its original packaging.
Return procedure for LT1221CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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