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Analog Devices Inc. LT1220CN8#PBF
- Part No.:
- LT1220CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1220CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:222
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Product details
Overview
LT1220CN8#PBF from Analog Devices (formerly Linear Technology) is a high-speed, precision operational amplifier optimized for data acquisition and video signal conditioning. It delivers 45MHz gain-bandwidth, 250V/µs slew rate, ±12V output swing into 500Ω, 0.1% settling in 75ns, and drives capacitive loads up to 10,000pF-enabling use as a DAC current-to-voltage converter or coaxial cable driver in 12-bit systems.
For engineers reviewing the LT1220CN8#PBF datasheet, LT1220CN8#PBF pinout, LT1220CN8#PBF application, or LT1220CN8#PBF equivalent, key selection criteria include unity-gain stability, input offset voltage ≤1mV, differential gain/phase performance at 3.58MHz, and compatibility with ±5V to ±15V supplies in industrial temperature range designs.
Technical Context
The LT1220CN8#PBF employs a single-stage complementary bipolar architecture with proprietary DC gain enhancement, enabling precision performance without sacrificing speed. Its internal bias current cancellation eliminates need for input impedance matching, and its C-Load™ compensation topology maintains stability with large capacitive loads by sensing output-pole-induced phase shift and applying adaptive gain-node compensation.
This architecture supports fast settling (95ns to 0.01%) and low distortion (0.1% differential gain, 0.2° differential phase at 3.58MHz), making it suitable for inverting/noninverting configurations in active filters, video amplifiers, and high-fidelity buffer stages where both bandwidth and DC accuracy are critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 45MHz - Enables stable unity-gain operation while supporting >10MHz small-signal bandwidth in closed-loop configurations. |
| Slew Rate | 250V/µs - Supports full-scale 10V step response with 95ns settling to 0.01%, critical for 12-bit DAC interface fidelity. |
| Input Offset Voltage | Max 1mV - Limits worst-case DC error to ≤3mV in I/V conversion circuits with 5kΩ feedback. |
| Output Swing | ±12V into 500Ω - Delivers rail-to-rail usable dynamic range for ±15V supply systems driving 75Ω cables or active filters. |
| Differential Gain/Phase | 0.1%/0.2° at 3.58MHz - Meets NTSC/PAL video linearity requirements when configured as AV = 2 amplifier with 150Ω load. |
| Capacitive Load Drive | Stable up to 10,000pF - Allows direct coaxial cable driving without external isolation resistors in cable driver applications. |
| Supply Current | 8–10.5mA - Enables low-power high-speed operation in multi-channel data acquisition systems with thermal budget constraints. |
Pinout & Package
LT1220CN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300-inch width, RoHS-compliant lead finish, and through-hole mounting. The package operates from –40°C to 85°C and features 130°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NULL) | Offset Null Input | Connects to external potentiometer wiper for manual input offset trimming; unused in standard configurations. |
| 2 (–IN) | Inverting Input | High-impedance node (20–45MΩ) with matched bias current cancellation; accepts differential signals or feedback networks. |
| 3 (+IN) | Noninverting Input | High-impedance node with identical bias current spec to –IN; enables true differential input operation without impedance matching. |
| 4 (V–) | Negative Supply Rail | Accepts –5V to –15V; supports dual-supply operation and defines lower common-mode input range (–13V min). |
| 5 (NULL) | No Connect | Internally unconnected; must remain floating or grounded per layout best practices to avoid noise coupling. |
| 6 (V+) | Positive Supply Rail | Accepts +5V to +15V; defines upper common-mode input range (up to +14V) and output swing headroom. |
| 7 (VOUT) | Amplifier Output | Capable of ±12V swing into 500Ω and 24–26mA continuous output current; drives capacitive loads directly. |
| 8 (NC) | No Connect | Internally unconnected; no electrical function; leave unconnected on PCB. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-Gain Stable Architecture | Eliminates need for external compensation components in gain = 1 configurations, reducing BOM count and layout complexity. |
| C-Load™ Compensation | Enables stable operation with up to 10,000pF capacitive load-critical for driving long coaxial cables without series termination. |
| Bias Current Cancellation | Matches input bias and offset currents (≤300nA), removing requirement for input resistor balancing in precision transimpedance designs. |
| Fast Settling Performance | 95ns to 0.01% for 10V step ensures sub-LSB accuracy in 12-bit DAC I/V converters with <300ns total system settling. |
| Video Signal Linearity | 0.1% differential gain and 0.2° differential phase at 3.58MHz meet broadcast-grade analog video specifications in AV = 2 configurations. |
Applications
| Cable Driver | DAC Current-to-Voltage Conversion |
|---|---|
Use Scenario: Driving 75Ω coaxial video or RF cables over distances up to 100m in broadcast equipment or test instrumentation. IC Role / Device Role / Timing Role: High-output-current buffer amplifier operating in unity-gain configuration with series 75Ω output termination. Use Value: Maintains pulse fidelity with <5% overshoot and 2.5ns rise time, eliminating need for external isolation or equalization circuitry. |
Use Scenario: Converting 2mA full-scale current output from 12-bit DACs (e.g., AD565A) into precise 10V full-scale voltage outputs. IC Role / Device Role / Timing Role: Transimpedance amplifier with 5kΩ feedback resistor and 5pF compensation capacitor for optimal settling. Use Value: Achieves <300ns settling to 1/2 LSB (1.2mV) and worst-case DC error of 6mV (2.5 LSB) across 0°C–70°C commercial temperature range. |
| Active Filter Stage | High-Speed Data Acquisition Front-End |
Use Scenario: Implementing 4th-order Butterworth low-pass filtering at 1MHz in medical imaging or spectrum analysis front-ends. IC Role / Device Role / Timing Role: Dual-amplifier active filter section using Sallen-Key or multiple-feedback topology with precise gain control. Use Value: Provides >45dB stopband attenuation at 2× cutoff frequency while preserving transient response integrity via 45MHz GBW headroom. |
Use Scenario: Signal conditioning stage preceding SAR or sigma-delta ADCs in automated test equipment requiring 12-bit accuracy at 1MSPS. IC Role / Device Role / Timing Role: Track-and-hold buffer or multiplexer driver with low input capacitance (2pF) and high CMRR (92–114dB). Use Value: Minimizes charge injection errors and maintains >90dB PSRR across 10Hz–1MHz, ensuring clean sampling of noisy industrial sensor signals. |
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 |
|---|---|---|---|
| LT1221CS8#PBF | Higher 150MHz GBW but requires minimum gain ≥4; not unity-gain stable. | Better suited for fixed-gain ≥4 video gain blocks or RF IF amplifiers where stability at G=1 is not required. | Select when bandwidth >100MHz is needed and gain can be fixed ≥4; avoid for DAC I/V or unity-gain buffers. |
| AD817ARZ | Lower 50MHz GBW, 350V/µs slew rate, wider –40°C to +125°C operating range, different pinout. | Preferred for extended temperature industrial control or automotive infotainment where thermal robustness outweighs raw speed. | Choose for harsh-environment designs needing guaranteed operation beyond 85°C; verify PCB layout compatibility due to non-pin-compatible footprint. |
Compared with LT1220CN8#PBF, LT1221CS8#PBF trades unity-gain stability for higher bandwidth in fixed-gain roles, while AD817ARZ offers broader temperature coverage and higher slew rate at reduced bandwidth-making each suitable only in distinct design contexts defined by gain configuration, thermal environment, and layout constraints.
Availability
LT1220CN8#PBF is available at Aetrix Electronics and suitable for data acquisition systems, video signal conditioning, and high-speed buffer applications requiring stable component supply with traceable sourcing and long-term lifecycle support.
Supply support for LT1220CN8#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. (ADI) is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and high-speed signal chain applications.
The LT1220 family was originally developed by Linear Technology (acquired by ADI in 2017) to address demanding high-speed precision needs in data acquisition, video, and instrumentation-emphasizing unity-gain stability, capacitive load drive, and low-distortion wideband operation.
FAQ
What is the maximum capacitive load the LT1220CN8#PBF can drive stably?
The LT1220CN8#PBF is specified to drive up to 10,000pF capacitive loads stably without external compensation, as confirmed in the Applications Information section and TPC21 waveform plots. This capability stems from its proprietary C-Load™ compensation architecture, which senses load-induced phase shift and applies adaptive correction at the gain node. For optimal pulse fidelity with 75Ω coaxial cables, a series 75Ω resistor is still recommended at the output.
Does the LT1220CN8#PBF require external nulling components for precision applications?
The LT1220CN8#PBF includes dedicated NULL pins (Pin 1 and Pin 5) for external offset nulling via a 5kΩ potentiometer, as shown in Application Figure AI01. While not required for all applications-especially where 1mV max VOS is acceptable-nulling reduces worst-case DC error in high-accuracy DAC I/V converters or precision active filters. The internal bias current cancellation means no input resistor matching is needed, simplifying nulling implementation.
Can the LT1220CN8#PBF operate from ±5V supplies?
Yes, the LT1220CN8#PBF is fully specified for operation from ±5V to ±15V supplies, with electrical characteristics validated at ±15V and ±5V in the Electrical Characteristics tables. At ±5V, PSRR remains >86dB, output swing reaches ±3.5V into 500Ω, and supply current drops to ~8mA-making it viable for low-voltage portable instrumentation where power efficiency and rail-to-rail utilization are critical.
How does the LT1220CN8#PBF compare to the LT1222 in terms of gain requirements?
The LT1220CN8#PBF is unity-gain stable, whereas the LT1222 requires minimum gain ≥10 for stability, as explicitly stated in the Applications section: "for gains of 10 or greater the LT1222 can be used for increased bandwidth." This fundamental difference means LT1220CN8#PBF supports buffer, follower, and gain-of-1 configurations essential for DAC I/V conversion and cable driving, while LT1222 is restricted to higher-gain signal chains like RF gain blocks or IF amplifiers.
Is the LT1220CN8#PBF pin-compatible with legacy HA25xx or AD847 op-amps?
The LT1220CN8#PBF is designed for drop-in replacement in HA2505/15/25, HA2541/2/4, AD847, and other legacy high-speed op-amps, provided nulling circuitry is removed per the Applications Information note. Its N8 DIP pinout matches industry-standard 8-pin op-amp layouts (Pin 2 = –IN, Pin 3 = +IN, Pin 4 = V–, Pin 6 = V+, Pin 7 = OUT), enabling direct PCB substitution in existing designs without layout changes.
LT1220CN8#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:
- 45 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 100 nA
- Voltage - Input Offset:
- 500 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
LT1220CN8#PBF FAQ
1.How can I place an order for LT1220CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1220CN8#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 LT1220CN8#PBF reliable?
The price and inventory of LT1220CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1220CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1220CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1220CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1220CN8#PBF?
LT1220CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1220CN8#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 LT1220CN8#PBF?
For technical support, including LT1220CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1220CN8#PBF requirements.
6.How does Aetrix verify that LT1220CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1220CN8#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 LT1220CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1220CN8#PBF?
All LT1220CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1220CN8#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 LT1220CN8#PBF part is unused and in its original packaging.
Return procedure for LT1220CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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