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Analog Devices Inc. LT1224CN8#PBF
- Part No.:
- LT1224CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1224CN8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:106
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Product details
Overview
LT1224CN8#PBF from Analog Devices (acquired Linear Technology) is a unity-gain stable, very high speed voltage-feedback operational amplifier optimized for data acquisition and precision video signal conditioning. It delivers 45MHz gain-bandwidth, 400V/µs slew rate, 90ns 0.1% settling time for 10V steps, ±12V output swing into 500Ω with ±15V supplies, and drives all capacitive loads without external compensation.
For engineers reviewing the LT1224CN8#PBF datasheet, LT1224CN8#PBF pinout, LT1224CN8#PBF application, or LT1224CN8#PBF equivalent, key selection criteria include DC accuracy (2mV max VOS), wide supply range (±2.5V to ±15V), robust capacitive load drive capability, and compatibility with legacy HA2541/AD847 layouts when nulling circuitry is removed.
Technical Context
The LT1224CN8#PBF employs a single-stage bipolar complementary architecture delivering fast settling via optimized internal compensation. Its unity-gain stability is achieved without external components, and its input stage provides 24–40MΩ input resistance with 2pF input capacitance and 22nV/√Hz input voltage noise at 10kHz.
Output stage design enables ±12V swing into 500Ω and ±3V into 150Ω on ±5V supplies, while maintaining 24–40mA output current capability. The amplifier remains stable driving coaxial cables and large capacitive loads up to 10,000pF, with bandwidth and phase margin degrading predictably as load capacitance increases.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain-Bandwidth Product | 45MHz - Enables stable closed-loop operation up to 10MHz in gain-of-10 configurations with adequate phase margin. |
| Slew Rate | 400V/µs - Supports full-scale 10V transitions in under 25ns, critical for DAC current-to-voltage conversion with sub-140ns total settling. |
| Settling Time | 90ns to 0.1% - Ensures accurate sampling in 10-bit+ data acquisition systems operating above 5MSps. |
| Input Offset Voltage | 2mV max - Maintains DC accuracy in precision buffer and active filter stages without trimming. |
| Supply Range | ±2.5V to ±15V - Allows operation from low-power ±5V systems to high-dynamic-range ±15V instrumentation rails. |
| Capacitive Load Drive | Stable with all values - Eliminates need for isolation resistors or external compensation in cable driver and ADC buffer applications. |
| Output Swing | ±12V into 500Ω - Delivers full-rail performance into standard test loads without clipping at high frequencies. |
| Input Noise | 22nV/√Hz at 10kHz - Low enough for video amplification and medium-bandwidth sensor signal conditioning. |
Pinout & Package
LT1224CN8#PBF is housed in an 8-lead plastic DIP (N8) package with 0.300-inch width, JEDEC MS-001 compliant footprint, and θJA = 100°C/W. Pin 1 is NULL (offset null), Pin 2 is –IN, Pin 3 is +IN, Pin 4 is V–, Pin 5 is NC (no connection), Pin 6 is V+, Pin 7 is OUT, Pin 8 is NULL (offset null).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | Offset Null | Connect external 5kΩ potentiometer wiper to V– and ends to Pins 1 & 8 to trim input offset voltage below 1mV. |
| 2 | Inverting Input | Differential input node with 2pF capacitance; requires matched source impedances to minimize DC error from input bias current mismatch. |
| 3 | Non-Inverting Input | High-impedance input referenced to common-mode range of ±12V (at ±15V supplies); sensitive to layout-induced parasitics. |
| 4 | Negative Supply | Accepts –2.5V to –15V; must be bypassed with 0.01–0.1µF RF capacitor near pin to suppress high-frequency oscillation. |
| 5 | No Connection | Internally unconnected; must remain floating-no PCB trace or thermal pad should attach to this pin. |
| 6 | Positive Supply | Accepts +2.5V to +15V; requires low-ESR 1–10µF tantalum capacitor in parallel with 0.01–0.1µF ceramic for high-current transient support. |
| 7 | Output | Class-AB output capable of sourcing/sinking ≥24mA; drives 75Ω coax directly but benefits from series termination for pulse fidelity. |
Key Features
| Feature | Design Value |
|---|---|
| Unity-Gain Stable Architecture | Operates stably at AV = +1 or –1 without external compensation, reducing BOM count and layout sensitivity. |
| Balanced Slew Enhancement | Equalizes rising/falling edge slew rates in non-inverting configurations, eliminating asymmetry in pulse response. |
| Wide Common-Mode Input Range | Accepts inputs from –13V to +14V (at ±15V supplies), enabling direct interfacing with ±10V DAC outputs and industrial sensors. |
| High DC Gain (7V/mV) | Delivers >134dB open-loop gain at DC, supporting precision active filters and low-error integrators without gain drift. |
| Robust Capacitive Load Tolerance | Maintains stability with 0–10,000pF loads by sensing output pole and applying adaptive internal compensation. |
| Low Input Bias Current (4–8µA) | Minimizes voltage error across high-value feedback networks, preserving accuracy in transimpedance amplifiers. |
Applications
| Video Signal Amplification | Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying composite video signals (3.58MHz NTSC) with minimal differential gain/phase error. IC Role / Device Role / Timing Role: Non-inverting buffer with gain-of-2 driving 75Ω coaxial cable. Use Value: Achieves 1% differential gain error and 2.4° differential phase shift at 3.58MHz, meeting broadcast-grade fidelity requirements. | Use Scenario: Converting 2mA full-scale current output from DAC-08 to 0–10V voltage with <140ns total settling. IC Role / Device Role / Timing Role: Transimpedance amplifier with 5kΩ feedback resistor and 500pF compensation capacitor. Use Value: Settles to 40mV (4 LSB) in 140ns for both 0→10V and 10→0V steps, enabling >5MSps sampling without aperture uncertainty. |
| Cable Driver for Industrial Bus | Active Filter Stage |
Use Scenario: Driving 100m of twisted-pair RS-422/RS-485 stubs in factory automation systems. IC Role / Device Role / Timing Role: High-slew-rate line driver with series 75Ω termination at output. Use Value: Maintains <10% overshoot and <1ns jitter on 10MHz square waves over 100m distance, ensuring reliable clock distribution. | Use Scenario: Implementing 2nd-order Butterworth low-pass filtering at 430kHz for anti-aliasing before SAR ADC. IC Role / Device Role / Timing Role: Dual-amplifier topology with precise resistor ratio matching (R1/R2/R3/R4) for CMRR optimization. Use Value: Delivers flat passband response ±0.1dB to 430kHz and 40dB stopband attenuation at 2MHz, preventing aliasing in 1MSPS systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-speed op-amp applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD847JRZ | Lower GBW (50MHz), higher VOS (3mV max), no built-in capacitive load compensation. | Requires external compensation for >100pF loads; less suitable for direct cable driving. | Select AD847JRZ only when higher bandwidth is prioritized over load drive simplicity and DC accuracy. |
| EL2020CS | Higher supply current (12mA), lower slew rate (250V/µs), wider input voltage range (±16V). | Less efficient in battery-powered DAQ; slower settling limits usable sample rate. | Choose EL2020CS when absolute rail-to-rail input range is required and 90ns settling is not critical. |
Compared with AD847JRZ and EL2020CS, the LT1224CN8#PBF offers superior combination of 45MHz GBW, 400V/µs slew rate, and unconditional capacitive load stability-making it optimal for DAC buffering, video amplification, and cable driving where layout simplicity and pulse fidelity are essential.
Availability
LT1224CN8#PBF is available at Aetrix Electronics and suitable for video signal conditioning, data acquisition front-ends, industrial cable driving, and active filter designs requiring stable component supply across extended production lifecycles.
Supply support for LT1224CN8#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.
The LT1224CN8#PBF belongs to Linear Technology's legacy high-speed op-amp product line, designed specifically for demanding data acquisition, video, and instrumentation applications where speed, accuracy, and load drive capability are co-critical.
FAQ
What is the maximum capacitive load the LT1224CN8#PBF can drive without oscillation?
The LT1224CN8#PBF is specified as stable with all capacitive loads, including up to 10,000pF. At 1000pF, small-signal response shows 50% peaking; at 10,000pF, large-signal response exhibits slew-rate limiting due to short-circuit current limits. No external compensation is required, though series output resistance may improve pulse fidelity on long cables. This behavior is confirmed in the LT1224CN8#PBF datasheet Figure TPC01 through TPC18.
Can the LT1224CN8#PBF operate from a single +5V supply?
No-the LT1224CN8#PBF is a dual-supply operational amplifier requiring symmetric positive and negative rails (±2.5V to ±15V). It does not support true single-supply operation because its input common-mode range extends only to within ~1.5V of each rail, and output swing is centered at ground. For +5V-only systems, consider rail-to-rail input/output amplifiers like the ADA4897-1. The LT1224CN8#PBF datasheet explicitly specifies "Total Supply Voltage (V+ to V–) = 36V" and lists operating conditions only for dual supplies.
What is the recommended offset nulling configuration for the LT1224CN8#PBF?
The LT1224CN8#PBF uses Pins 1 and 8 for offset nulling. Connect a 5kΩ potentiometer: wiper to V– (Pin 4), one end to Pin 1, the other end to Pin 8. This configuration reduces input offset voltage to <1mV. Avoid using >5kΩ pots, as leakage currents degrade nulling effectiveness. The LT1224CN8#PBF datasheet Figure TA03 shows this exact circuit, and notes that nulling circuitry must be removed when replacing HA2541 or AD847 devices.
How does the LT1224CN8#PBF compare to the LT1223 in terms of bandwidth and slew rate?
The LT1224CN8#PBF offers 45MHz gain-bandwidth and 400V/µs slew rate, while the LT1223 provides 100MHz GBW and 1000V/µs slew rate-but at the cost of reduced DC precision (3mV VOS max vs. 2mV) and no guaranteed unity-gain stability. The LT1224CN8#PBF is optimized for applications needing balanced AC/DC performance, whereas the LT1223 targets ultra-high-speed, AC-coupled systems. Both share the same N8/S8 packaging and pinout, enabling drop-in replacement only in non-unity-gain configurations.
Is the LT1224CN8#PBF RoHS compliant and lead-free?
Yes-the #PBF suffix in LT1224CN8#PBF explicitly denotes lead-free (Pb-free) and RoHS-compliant construction per EU Directive 2011/65/EU. The device uses matte tin lead finish, meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3), and is qualified for reflow soldering up to 260°C peak. This compliance is documented in Analog Devices' official part marking and packaging specifications for the LT1224CN8#PBF.
LT1224CN8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- 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:
- 400V/µs
- Gain Bandwidth Product:
- 45 MHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 µA
- Voltage - Input Offset:
- 500 µV
- Current - Supply:
- 7mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 5 V
- Voltage - Supply Span (Max):
- 30 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1224CN8#PBF FAQ
1.How can I place an order for LT1224CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1224CN8#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 LT1224CN8#PBF reliable?
The price and inventory of LT1224CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1224CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1224CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1224CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1224CN8#PBF?
LT1224CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1224CN8#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 LT1224CN8#PBF?
For technical support, including LT1224CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1224CN8#PBF requirements.
6.How does Aetrix verify that LT1224CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1224CN8#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 LT1224CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1224CN8#PBF?
All LT1224CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1224CN8#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 LT1224CN8#PBF part is unused and in its original packaging.
Return procedure for LT1224CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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