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Analog Devices Inc. LT1220CS8#PBF
- Part No.:
- LT1220CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1220CS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,252
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Product details
Overview
LT1220CS8#PBF from Analog Devices (formerly Linear Technology) is a high-speed, unity-gain stable operational amplifier optimized for precision data acquisition and video signal conditioning. It delivers 45MHz gain-bandwidth, 250V/µs slew rate, ±12V output swing into 500Ω, 75ns 0.1% settling time, and drives capacitive loads up to 10,000pF without external compensation - enabling direct coaxial cable driving in broadcast and instrumentation systems.
For engineers reviewing the LT1220CS8#PBF datasheet, LT1220CS8#PBF pinout, LT1220CS8#PBF application, or LT1220CS8#PBF equivalent, key selection criteria include its C-Load™ stability architecture, low 1mV max input offset voltage, 300nA max input bias current, differential gain/phase performance (0.1%/0.2° at 3.58MHz), and SOIC-8 packaging for surface-mount industrial PCBs.
Technical Context
The LT1220CS8#PBF employs a single-stage complementary bipolar architecture with proprietary DC gain enhancement, achieving precision-level DC specs (e.g., 20V/mV min open-loop gain) without sacrificing speed. Its internal compensation ensures unity-gain stability while maintaining 45MHz bandwidth and 250V/µs slew rate - unlike decompensated amplifiers requiring minimum gain constraints.
Capacitive load drive capability stems from an output-pole sensing compensation scheme that dynamically adjusts internal phase margin; this enables stable operation with 1000pF–10,000pF loads but trades off bandwidth and increases overshoot as capacitance rises. Input bias current cancellation eliminates need for impedance matching on inverting/non-inverting inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 45MHz - supports closed-loop bandwidths up to ~40MHz at AV = 1, critical for high-fidelity video and RF signal paths. |
| Slew Rate | 250V/µs - enables full-scale 20V step response within 95ns (0.01%), essential for fast-settling DAC buffers and pulse amplification. |
| Input Offset Voltage | Max 1mV - ensures ≤1.2mV error in 12-bit DAC I/V conversion (5kΩ feedback), meeting sub-½LSB accuracy at room temperature. |
| Output Swing | ±12V into 500Ω - delivers rail-to-rail usable dynamic range with ±15V supplies, supporting legacy analog test equipment interfaces. |
| Settling Time | 75ns to 0.1%, 95ns to 0.01% - meets timing budgets for 10MSPS+ data acquisition systems with 12-bit resolution. |
| Differential Gain/Phase | 0.1%/0.2° at 3.58MHz - satisfies NTSC/PAL broadcast video linearity requirements without external peaking networks. |
| Capacitive Load Drive | Stable up to 10,000pF - allows direct connection to long coaxial cables (e.g., 75Ω, 100ft) without series termination or external compensation. |
Pinout & Package
LT1220CS8#PBF is housed in an 8-lead plastic SOIC (Small Outline Integrated Circuit) package, 0.150" wide body, with standard JEDEC MS-012AC footprint. Pin 1 is marked by a beveled corner or dot; device is RoHS-compliant and Pb-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (NC) | No Connect | Internally unused; must be left floating or tied to ground per layout best practices to minimize noise coupling. |
| 2 (–IN) | Inverting Input | High-impedance node (45MΩ typical); bias current cancellation eliminates need for matched source impedances. |
| 3 (+IN) | Non-Inverting Input | Same DC specs as –IN; used for unity-gain buffer or non-inverting amplifier configurations. |
| 4 (V–) | Negative Supply Rail | Accepts –15V max; requires local 0.1µF ceramic bypass capacitor placed <2mm from pin for high-frequency PSRR. |
| 5 (NC) | No Connect | Internally unused; electrically isolated from die - no routing or thermal relief required. |
| 6 (V+) | Positive Supply Rail | Accepts +15V max; paired with V– for dual-supply operation; total supply voltage ≤36V. |
| 7 (VOUT) | Amplifier Output | Capable of ±12V swing into 500Ω; short-circuit protected; drives 75Ω cables directly with series 75Ω termination. |
| 8 (NULL) | Offset Null Terminal | Connects to external 5kΩ potentiometer wiper for manual VOS trimming; not required for most applications. |
Key Features
| Feature | Design Value |
|---|---|
| C-Load™ Capacitive Load Stability | Enables direct driving of 10,000pF loads without external compensation, eliminating output RC networks in cable driver designs. |
| Unity-Gain Stable Architecture | Operates stably at AV = 1 without minimum gain restrictions - simplifies design of voltage followers and active filters. |
| Low Input Bias Current Matching | IB+ and IB– both ≤300nA with identical specs, removing need for input impedance balancing in precision transimpedance circuits. |
| Fast Settling with High DC Accuracy | 75ns to 0.1% + 1mV VOS enables 12-bit DAC buffering with <½LSB error, bridging speed/precision gap in data acquisition front-ends. |
| Broadcast-Grade Video Linearity | 0.1% differential gain / 0.2° differential phase at 3.58MHz meets NTSC/PAL spec without post-compensation tuning. |
Applications
| Cable Driver for Broadcast Video | DAC Current-to-Voltage Conversion |
|---|---|
Use Scenario: Driving 75Ω coaxial cable runs (up to 100ft) from video DAC outputs to monitors or distribution amplifiers in broadcast infrastructure. IC Role / Device Role / Timing Role: Unity-gain buffer with C-Load™ compensation, providing impedance-matched output and preserving pulse fidelity. Use Value: Eliminates external 75Ω series resistor and termination network while maintaining <0.1% differential gain error at 3.58MHz. |
Use Scenario: Converting 2mA full-scale current output from 12-bit DACs (e.g., AD565A) into 0–10V voltage signals for analog control loops. IC Role / Device Role / Timing Role: Transimpedance amplifier with 5kΩ feedback, leveraging low VOS and fast settling for sub-½LSB accuracy. Use Value: Achieves <300ns settling to 1.2mV (½LSB) with integrated 5pF feedback compensation, reducing component count vs. discrete op-amp solutions. |
| High-Speed Data Acquisition Front-End | Active Filter for RF Signal Conditioning |
Use Scenario: Buffering and amplifying sensor signals in 10MSPS+ digitizers used in automated test equipment and oscilloscope vertical sections. IC Role / Device Role / Timing Role: High-slew-rate gain stage preceding ADC, ensuring full-scale 20V steps settle within 95ns to 0.01%. Use Value: 250V/µs slew rate and 45MHz GBW support >10MHz small-signal bandwidth while maintaining DC precision for calibration. |
Use Scenario: Implementing 4th-order Butterworth low-pass filtering at 1MHz in RF receiver IF stages or spectrum analyzer preselectors. IC Role / Device Role / Timing Role: Dual-amplifier active filter topology (e.g., biquad), using one LT1220CS8#PBF per stage for gain and Q control. Use Value: Low noise (17nV/√Hz) and high open-loop gain (>100dB at DC) ensure sharp roll-off and minimal passband ripple without gain peaking. |
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 | 150MHz GBW, same 250V/µs slew rate, but decompensated - requires minimum gain of 4 for stability. | Better suited for fixed-gain ≥4 signal chains (e.g., gain blocks, composite amplifiers); unsuitable for unity-gain buffers or followers. | Select when higher bandwidth is needed and closed-loop gain can be maintained ≥4; avoid for DAC buffering or cable driving where AV = 1 is required. |
| ADA4898-1ARZ | 210MHz GBW, 100V/µs slew rate, lower 1.2nV/√Hz noise, but only stable to 1000pF - lacks C-Load™ architecture. | Preferred for ultra-low-noise, high-bandwidth applications with moderate capacitive loads (<1nF); cannot replace LT1220CS8#PBF in 10,000pF cable driver roles. | Choose for noise-sensitive RF/IF stages where load capacitance is <1nF and DC precision is secondary to AC performance. |
Compared with LT1220CS8#PBF, LT1221CS8#PBF trades unity-gain stability for 3.3× higher bandwidth at AV ≥4, while ADA4898-1ARZ offers superior noise and bandwidth but sacrifices capacitive load drive - making LT1220CS8#PBF uniquely balanced for precision video, DAC buffering, and long-cable applications.
Availability
LT1220CS8#PBF is available at Aetrix Electronics and suitable for broadcast video infrastructure, high-speed data acquisition systems, and precision DAC interface circuits requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LT1220CS8#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) acquired Linear Technology in 2017 and maintains full product support, manufacturing, and documentation for the LT1220 family. ADI is a global leader in high-performance analog, mixed-signal, and power management ICs.
The LT1220CS8#PBF belongs to Linear Technology's legacy high-speed precision op-amp product line, engineered specifically for applications demanding simultaneous speed (45MHz/250V/µs), DC accuracy (1mV VOS), and robust capacitive load drive - targeting video, instrumentation, and data acquisition markets.
FAQ
What is the maximum capacitive load the LT1220CS8#PBF can drive without oscillation?
The LT1220CS8#PBF is specified to remain stable with capacitive loads up to 10,000pF, thanks to its proprietary C-Load™ compensation architecture. At 10,000pF, large-signal slew rate drops to ~4V/µs due to output current limiting, but the amplifier remains unconditionally stable. For optimal pulse fidelity with 75Ω coax, a series 75Ω resistor is recommended at the output.
Does the LT1220CS8#PBF require external nulling components for precision applications?
The LT1220CS8#PBF includes dedicated NULL pins (Pin 1 and Pin 8) for manual input offset voltage trimming using a 5kΩ potentiometer. However, with a maximum VOS of 1mV and typical value of 0.5mV, external nulling is unnecessary in most applications - including 12-bit DAC I/V conversion where worst-case error remains <3mV at room temperature.
Can the LT1220CS8#PBF operate from a single +5V supply?
No - the LT1220CS8#PBF is designed for dual-supply operation (e.g., ±5V to ±15V). Its input common-mode range extends to ±VS, and output swing is specified relative to both rails. With ±5V supplies, it delivers ±3.5V output into 500Ω. Single-supply use would violate input voltage range and output swing specifications, risking distortion or latch-up.
How does the LT1220CS8#PBF compare to the LT1222 in terms of bandwidth and stability?
The LT1222 offers 500MHz gain-bandwidth and 200V/µs slew rate but is decompensated for minimum gain ≥10 - it is unstable at unity gain. In contrast, the LT1220CS8#PBF provides 45MHz GBW with guaranteed unity-gain stability and superior DC specs (lower VOS, higher AVOL). They are not interchangeable; LT1220CS8#PBF suits AV = 1–2 applications, LT1222 targets high-gain RF stages.
Is the LT1220CS8#PBF pin-compatible with older HA25xx or AD817 op-amps?
Yes - the LT1220CS8#PBF shares the same 8-pin SOIC pinout as HA2505/15/25, HA2541/2/4, AD817, AD847, EL2020, EL2044, and LM6361. However, nulling circuitry must be removed during replacement, as LT1220CS8#PBF uses different internal offset compensation. Performance improvements include 2× higher GBW and 3× faster settling than AD817.
LT1220CS8#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:
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1220CS8#PBF FAQ
1.How can I place an order for LT1220CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1220CS8#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 LT1220CS8#PBF reliable?
The price and inventory of LT1220CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1220CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1220CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1220CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1220CS8#PBF?
LT1220CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1220CS8#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 LT1220CS8#PBF?
For technical support, including LT1220CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1220CS8#PBF requirements.
6.How does Aetrix verify that LT1220CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1220CS8#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 LT1220CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1220CS8#PBF?
All LT1220CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1220CS8#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 LT1220CS8#PBF part is unused and in its original packaging.
Return procedure for LT1220CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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