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Analog Devices Inc. LT1223CN8#PBF
- Part No.:
- LT1223CN8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LT1223CN8#PBF.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:641
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Product details
Overview
LT1223CN8#PBF from Analog Devices (formerly Linear Technology) is a 100MHz current feedback amplifier optimized for high-speed video, cable driving, and data acquisition. It delivers 1000V/µs slew rate, ±50mA output drive, and 75ns settling time to 0.1%, operating from ±5V to ±15V supplies with 1mV input offset voltage. It is used in double-terminated 75Ω video cable drivers and 12-bit ADC front-ends.
For engineers reviewing the LT1223CN8#PBF datasheet, LT1223CN8#PBF pinout, LT1223CN8#PBF application, or LT1223CN8#PBF equivalent, key selection criteria include bandwidth stability across gain settings, shutdown functionality (Pin 8), thermal settling behavior in noninverting configurations, and RF-resistor–dependent compensation-critical for video instrumentation and IF amplification.
Technical Context
The LT1223CN8#PBF uses current feedback architecture: closed-loop bandwidth remains stable across gains (e.g., AV = 1 to 100) when RF is held constant, unlike voltage-feedback op amps. Its bandwidth is set by the Thevenin resistance at the inverting input and internal compensation capacitance-not by gain-bandwidth product.
It features dual-stage slew limiting: input stage ~350V/µs, output stage up to 2000V/µs (at RF = 1kΩ); thermal settling contributes ~200µV/V of input common-mode change in noninverting mode. Pin 8 enables shutdown, reducing supply current to <3mA and placing output in high-Z state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 100MHz at AV = 1 (RF = RG = 1kΩ); stable across gain settings due to current feedback topology |
| Slew Rate | 1000V/µs typical (RF = RG = 1.5kΩ); output-limited; degrades with larger RF |
| Input Offset Voltage | ±1mV max (0°C to 70°C); directly impacts DC accuracy in precision gain stages |
| Output Current | ±50mA min into 200Ω; supports driving double-terminated 75Ω cables without external buffers |
| Settling Time | 75ns to 0.1% (RF = RG = 1kΩ, VOUT = 10V); critical for 12-bit data acquisition systems |
| Supply Range | ±5V to ±15V (absolute max ±18V); enables operation in industrial and broadcast video rails |
| Shutdown Current | <3mA when Pin 8 sinks >200µA; enables power-gating in multi-channel video systems |
Pinout & Package
LT1223CN8#PBF is housed in an 8-lead plastic DIP (N8 package), 0.300-inch wide, with through-hole mounting and JEDEC-standard pinout. Operating junction temperature is rated to 150°C (θJA = 100°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Null / Offset Adjust | Connects to external potentiometer for trimming inverting input bias current-induced offset |
| 2 | Inverting Input (–IN) | Current-sensing node; requires stable RF termination to set bandwidth and stability |
| 3 | Noninverting Input (+IN) | Voltage-sensing node; 10MΩ input resistance; common-mode range extends to rails |
| 4 | V– | Negative supply rail; must be bypassed with ≥4.7µF tantalum within 0.5 inch |
| 5 | Null / Offset Adjust | Second offset trim terminal; used with Pin 1 for 2-terminal nulling circuit |
| 6 | Shutdown | Active-low enable: sinking >200µA forces shutdown; open-circuit = normal operation |
| 7 | V+ | Positive supply rail; same bypassing requirement as V– |
| 8 | Output (OUT) | Class-AB output stage; ±50mA drive; enters high-impedance state during shutdown |
Key Features
| Feature | Design Value |
|---|---|
| Gain-stable bandwidth | Maintains ~100MHz bandwidth from AV = 1 to AV = 100 when RF fixed at 1kΩ-enables scalable video gain without recompensation |
| Double-terminated cable drive | ±50mA output + low output impedance (35Ω) allows direct drive of 75Ω coax without external buffers or line receivers |
| Thermal settling control | Noninverting configuration exhibits predictable ~200µV/V thermal tail-enables accurate error budgeting in 10-bit+ video digitizers |
| Shutdown with high-Z output | Pin 8 activation reduces quiescent current to <3mA and disconnects output-essential for power-managed multi-amplifier video routing |
| RF-resistor–tuned response | Bandwidth and peaking adjusted via RF (not RG); supports optimization for flash ADC interfaces or low-distortion IF amplification |
Applications
| Video Cable Driver | IF Amplifier |
|---|---|
|
Use Scenario: Driving 75Ω coaxial cable between broadcast equipment with double termination. IC Role / Device Role / Timing Role: High-current, low-distortion buffer amplifier maintaining signal integrity up to 100MHz. Use Value: Eliminates need for external line drivers; differential gain/phase errors held to 0.02%/0.12° at 10MHz. |
Use Scenario: Intermediate-frequency amplification in 70MHz software-defined radio receiver chains. IC Role / Device Role / Timing Role: Fixed-gain current feedback stage providing flat group delay and minimal phase distortion. Use Value: 100MHz bandwidth and 800–1300V/µs slew rate support wide instantaneous bandwidth without gain peaking. |
| 12-Bit Data Acquisition Front-End | Video Instrumentation Amplifier |
|
Use Scenario: Buffering and gain-setting stage before 12-bit, 10MSPS SAR ADCs in test equipment. IC Role / Device Role / Timing Role: Low-settling-time driver ensuring full-scale step settles to 0.1% within 75ns. Use Value: Meets timing margin for 100ns conversion windows; 1mV offset avoids calibration drift over temperature. |
Use Scenario: Loop-through monitoring of analog video signals in production switchers with simultaneous feed to recorder and display. IC Role / Device Role / Timing Role: Dual-LT1223 configuration delivering >1MΩ input impedance and CMRR >63dB at 10MHz. Use Value: Enables passive cable sensing without loading source; rejects hum and noise on shared chassis grounds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar current feedback amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LT1395CS6#TRMPBF | 400MHz bandwidth, 800V/µs slew, SOT-23-6 package, no shutdown pin | Better for ultra-high-frequency IF stages (>200MHz); unsuitable for cable driving due to 100mA output limit and no high-Z shutdown | Select when board space is constrained and bandwidth >250MHz is required; verify layout for RF stability without shutdown control |
| LT1206CN8#PBF | 60MHz bandwidth, 900V/µs slew, 250mA output, integrated shutdown | Higher output current suits active video distribution; lower bandwidth limits use in >80MHz ADC sampling clocks | Prefer for multi-drop video fanout or high-current analog mux buffering where 60MHz suffices and 250mA drive is essential |
Compared with LT1223CN8#PBF, LT1395CS6#TRMPBF trades shutdown and DIP packaging for higher bandwidth in a micro-package, while LT1206CN8#PBF offers greater output current and simpler shutdown but sacrifices 40MHz bandwidth-making LT1223CN8#PBF optimal for balanced video/cable + precision data acquisition roles.
Availability
LT1223CN8#PBF is available at Aetrix Electronics and suitable for video infrastructure, IF signal conditioning, and 12-bit data acquisition systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for LT1223CN8#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 its high-performance analog portfolio. Linear Technology was renowned for precision amplifiers, regulators, and signal-conditioning ICs targeting demanding industrial and communications applications.
The LT1223 series was designed specifically for high-speed current feedback applications-including broadcast video, cable TV infrastructure, and high-fidelity data acquisition-where bandwidth stability across gain, fast settling, and robust output drive are mandatory.
FAQ
What is the maximum safe supply voltage for LT1223CN8#PBF?
The absolute maximum supply voltage for LT1223CN8#PBF is ±18V (36V total). Operation beyond this risks permanent damage. The device is characterized from ±5V to ±15V, and bandwidth scales approximately linearly with supply voltage-e.g., bandwidth at ±5V is roughly half that at ±15V for identical RF.
Does LT1223CN8#PBF support single-supply operation?
Yes, LT1223CN8#PBF supports single-supply operation (e.g., +10V and GND), provided the input common-mode range and output swing remain within specification. Input voltage range is typically ±10V, and output swing is ±10V into 200Ω-so with +10V supply, usable output is ~0.5V to 9.5V depending on load.
How does feedback resistor (RF) selection affect LT1223CN8#PBF performance?
RF directly sets bandwidth, stability, and slew rate in LT1223CN8#PBF. Lower RF (e.g., 750Ω) increases bandwidth and slew but may cause peaking; higher RF (e.g., 2kΩ) reduces bandwidth and improves phase margin. Gain is set by RG, not RF-changing RF alone preserves gain while tuning dynamics.
Can LT1223CN8#PBF drive capacitive loads directly?
LT1223CN8#PBF can drive moderate capacitive loads (≤100pF) directly if RF is increased per the "Maximum Capacitive Load vs Feedback Resistor" curve. For larger loads, a 10–20Ω isolation resistor in series with the output is recommended to maintain stability without degrading DC accuracy.
What is the thermal settling behavior of LT1223CN8#PBF in noninverting configurations?
In noninverting mode, LT1223CN8#PBF exhibits ~200µV of thermal settling per volt of input common-mode change, resulting in ~2.5mV tail after a 10V step. This is distinct from inverting mode (<500µV thermal settling) and must be included in timing budgets for precision video or data acquisition systems.
LT1223CN8#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:
- Current Feedback
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 1300V/µs
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 100 MHz
- Current - Input Bias:
- 1 µA
- Voltage - Input Offset:
- 1 mV
- Current - Supply:
- 6mA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 8 V
- Voltage - Supply Span (Max):
- 36 V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
LT1223CN8#PBF FAQ
1.How can I place an order for LT1223CN8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1223CN8#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 LT1223CN8#PBF reliable?
The price and inventory of LT1223CN8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1223CN8#PBF is usually 5 days.
3.What payment methods are accepted for LT1223CN8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1223CN8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1223CN8#PBF?
LT1223CN8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1223CN8#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 LT1223CN8#PBF?
For technical support, including LT1223CN8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1223CN8#PBF requirements.
6.How does Aetrix verify that LT1223CN8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1223CN8#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 LT1223CN8#PBF meets industry standards.
7.What is the process for return or replacement of LT1223CN8#PBF?
All LT1223CN8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1223CN8#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 LT1223CN8#PBF part is unused and in its original packaging.
Return procedure for LT1223CN8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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