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Analog Devices Inc. LT1221CN8#PBF
- Part No.:
- LT1221CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1221CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:129
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Product details
Overview
LT1221CN8#PBF from Analog Devices (formerly Linear Technology) is a high-speed, precision voltage-feedback operational amplifier optimized for gain ≥4 configurations. It delivers 150MHz gain-bandwidth, 250V/µs slew rate, 6nV/√Hz input noise, ±12V output swing into 500Ω, and 65ns 0.1% settling time - enabling use in 10-bit to 12-bit data acquisition front-ends, video line drivers, and active filter stages.
For engineers reviewing the LT1221CN8#PBF datasheet, LT1221CN8#PBF pinout, LT1221CN8#PBF application, or LT1221CN8#PBF equivalent, key selection criteria include noise gain stability at AV ≥4, capacitive load drive capability up to 10nF, differential gain/phase performance (<0.08%/0.2° at 3.58MHz), and DC precision (600µV max VOS, 300nA max IB) in an 8-lead PDIP package.
Technical Context
The LT1221CN8#PBF employs a single-stage complementary bipolar architecture with proprietary DC gain enhancement, achieving precision without sacrificing speed. Its internal compensation ensures stability at noise gains ≥4, eliminating need for external nulling in most applications - unlike unity-gain stable variants such as the LT1220.
It integrates bias current cancellation circuitry, making input bias and offset currents matched (both ≤300nA), and features C-Load™ technology that senses output pole shift under capacitive loading to maintain phase margin - enabling direct coaxial cable driving with 75Ω series termination.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 150MHz - supports 15MHz bandwidth at AV = 10, enabling high-resolution signal conditioning in fast data converters. |
| Slew Rate | 250V/µs - ensures full-scale 10V step settles within 85ns to 0.01%, critical for pulse fidelity in video and instrumentation. |
| Input Noise Voltage | 6nV/√Hz at 10kHz - low enough to preserve SNR in 12-bit systems with <100kHz signal bandwidth. |
| Input Offset Voltage | 600µV max - enables accurate DC-coupled amplification without trimming in industrial sensor interfaces. |
| Output Swing | ±12V into 500Ω - delivers rail-to-rail usable dynamic range with ±15V supplies, supporting legacy analog test equipment designs. |
| Differential Gain/Phase | 0.08%/0.2° at 3.58MHz - meets NTSC/PAL broadcast video linearity requirements when configured as AV = 4 buffer. |
| Capacitive Load Drive | Stable up to 10,000pF - allows direct connection to long cables or ADC input capacitance without external isolation resistors. |
Pinout & Package
N8 package: 8-lead narrow-body plastic DIP (0.300″ width), through-hole mount, JEDEC MS-001 compliant. RoHS-compliant lead finish (Pb-free with NiPdAu over Cu).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Null (Offset Null) | Connects to external potentiometer for manual VOS trimming; omitted in production if DC accuracy <1mV suffices. |
| 2 | Inverting Input (–IN) | High-impedance node (45MΩ typical); matched bias current enables impedance-independent DC error minimization. |
| 3 | Non-inverting Input (+IN) | Identical input structure to Pin 2; bias current cancellation eliminates need for input impedance matching. |
| 4 | Negative Supply (V–) | Accepts –15V max; input common-mode extends to –13V, supporting single-supply operation down to V– + 2V. |
| 5 | Null (Offset Null) | Second terminal of same internal nulling network as Pin 1; used with 10kΩ pot across Pins 1–5 for trimming. |
| 6 | Output (VOUT) | Capable of ±26mA continuous drive; stable with >10nF loads due to internal C-Load™ compensation. |
| 7 | Positive Supply (V+) | Accepts +15V max; PSRR >90dB up to 100kHz ensures immunity to digital supply noise in mixed-signal systems. |
| 8 | No Connect (NC) | Internally unconnected; must remain floating - no tie to ground or supply to avoid parasitic coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Noise Gain Stability | Guaranteed stable at AV ≥4 - eliminates need for external compensation in gain-of-4 video buffers and summing amps. |
| C-Load™ Capacitive Drive | Internal adaptive compensation maintains phase margin with 10nF loads - enables direct 75Ω coaxial cable driving without series resistor. |
| Bias Current Cancellation | Matched IB and IOS (≤300nA each) - removes requirement for input resistor balancing in transimpedance or differential configurations. |
| DC Precision at Speed | 600µV VOS and 50V/mV DC gain at RL = 500Ω - achieves 0.012% linearity error in 12-bit systems without calibration. |
| Video Signal Fidelity | 0.08% differential gain / 0.2° differential phase at 3.58MHz - satisfies broadcast-grade composite video amplification per EIA-770.1. |
Applications
| Video Line Driver | Data Acquisition Front-End |
|---|---|
|
Use Scenario: Driving 75Ω coaxial cable in SDTV broadcast equipment with composite video signal (3.58MHz color subcarrier). IC Role / Device Role / Timing Role: High-fidelity non-inverting buffer with AV = 4, providing gain, drive strength, and phase-matched frequency response. Use Value: Meets EIA-770.1 differential gain/phase specs without external peaking networks, reducing BOM count by 3 passive components. |
Use Scenario: Amplifying outputs of 12-bit SAR ADCs in automated test equipment requiring 100ksps sampling with <0.01% settling. IC Role / Device Role / Timing Role: Fast-settling gain stage preceding anti-alias filtering, operating at AV = 5 with 15MHz bandwidth. Use Value: 65ns 0.1% settling enables full-scale step resolution within one sample period, avoiding pipeline latency penalties. |
| Active Low-Pass Filter | Cable-Compensated Buffer |
|
Use Scenario: 5MHz 4-pole Butterworth filter in medical ultrasound receive path where group delay flatness is critical. IC Role / Device Role / Timing Role: Unity-gain stable op-amp not applicable; LT1221CN8#PBF used in AV = 4 configuration with feedback network shaping poles. Use Value: 150MHz GBW provides >30dB open-loop gain at 5MHz, ensuring filter Q and cutoff accuracy within ±0.5%. |
Use Scenario: Compensating dielectric loss in 50m RG-58 cable carrying 10MHz square waves in industrial control I/O modules. IC Role / Device Role / Timing Role: Inverting driver with 75Ω series output resistor and 75Ω end termination, configured for AV = –1. Use Value: 250V/µs slew rate preserves 10%–90% rise time <3.5ns, maintaining edge integrity after 50m transmission. |
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 (AV ≥1), lower GBW (45MHz), same 250V/µs slew rate and 8-lead PDIP package. | Required where gain <4 is needed (e.g., transimpedance amps, unity-gain followers); sacrifices bandwidth for stability flexibility. | Select LT1220CN8#PBF only when noise gain <4 is mandatory; otherwise LT1221CN8#PBF offers 3.3× higher bandwidth at same gain. |
| AD8009ARZ | Unity-gain stable, higher GBW (1GHz), higher slew rate (5500V/µs), SOIC-8 package, but 1.2mV max VOS and no C-Load™. | Better for RF/IF gain blocks >100MHz; unsuitable for capacitive loads >100pF without external isolation. | Choose AD8009ARZ for >100MHz small-signal amplification; retain LT1221CN8#PBF for DC-coupled, capacitive-load-tolerant, medium-bandwidth precision apps. |
Compared with LT1220CN8#PBF, LT1221CN8#PBF trades unity-gain stability for 3.3× higher bandwidth at AV = 4; compared with AD8009ARZ, it sacrifices raw speed for guaranteed 10nF load drive and lower input offset - making it optimal for video, data acquisition, and cable-driving roles where precision and robustness outweigh peak frequency.
Availability
LT1221CN8#PBF is available at Aetrix Electronics and suitable for video line driving, 12-bit data acquisition systems, active filter design, and industrial cable interface applications requiring stable component supply across extended temperature ranges (–40°C to 85°C).
Supply support for LT1221CN8#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, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets.
The LT1221 belongs to Linear's "C-Load™" high-speed op-amp family, designed specifically for applications demanding simultaneous wide bandwidth, DC precision, and unconditional stability into reactive loads - targeting video infrastructure, test equipment, and high-fidelity signal chain design.
FAQ
What is the minimum stable gain for LT1221CN8#PBF?
The LT1221CN8#PBF is internally compensated for stability at noise gains of 4 or greater. It is not unity-gain stable; attempting AV = 1 or AV = 2 will cause oscillation. For unity-gain applications, the LT1220CN8#PBF is the designated alternative. The datasheet confirms stability in configurations like the summing amplifier (effective noise gain = 4) and AV = 4 non-inverting buffers.
Can LT1221CN8#PBF drive a 75Ω coaxial cable directly?
Yes - the LT1221CN8#PBF can drive 75Ω coaxial cable directly using a series 75Ω resistor at the output and 75Ω termination at the far end. Its C-Load™ architecture maintains stability with large capacitive loads, and its 250V/µs slew rate preserves edge integrity for video and digital signals. This configuration is explicitly validated in the LT1221 datasheet Figure TA05.
What is the maximum capacitive load LT1221CN8#PBF can drive without oscillation?
The LT1221CN8#PBF remains stable with capacitive loads up to 10,000pF (10nF), as verified in the "Large Signal, AV = 4, CL = 10,000pF" test waveform (TPC21). At this load, the slew rate degrades to ~4V/µs due to output current limiting, but phase margin stays sufficient for monotonic response. For loads >1nF, consult the Frequency Response vs Capacitive Load curve (TPC14) to assess peaking.
Does LT1221CN8#PBF require external nulling resistors?
External nulling resistors are optional. The LT1221CN8#PBF has pins 1 and 5 dedicated to offset nulling via a 10kΩ potentiometer; however, its max input offset voltage is only 600µV - often acceptable without trimming in 12-bit systems. Nulling is recommended only when sub-200µV DC error is required, such as in precision instrumentation amplifiers or calibrated sensor interfaces.
What is the operating temperature range for LT1221CN8#PBF?
The LT1221CN8#PBF is rated for commercial-grade operation from –40°C to +85°C. Although initial testing occurs over 0°C to 70°C, the device is fully specified and guaranteed across the extended industrial range. This is confirmed in the Absolute Maximum Ratings table, which lists "Operating Temperature Range LT1221C: –40°C TO 85°C" - distinct from obsolete military-grade LT1221M variants.
LT1221CN8#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:
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1221CN8#PBF FAQ
1.How can I place an order for LT1221CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1221CN8#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 LT1221CN8#PBF reliable?
The price and inventory of LT1221CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1221CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1221CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1221CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1221CN8#PBF?
LT1221CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1221CN8#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 LT1221CN8#PBF?
For technical support, including LT1221CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1221CN8#PBF requirements.
6.How does Aetrix verify that LT1221CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1221CN8#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 LT1221CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1221CN8#PBF?
All LT1221CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1221CN8#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 LT1221CN8#PBF part is unused and in its original packaging.
Return procedure for LT1221CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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