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Analog Devices Inc. LT1223CS8#PBF
- Part No.:
- LT1223CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1223CS8#PBF.pdf
- Description:
- IC OPAMP CFA 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,557
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Product details
Overview
LT1223CS8#PBF from Analog Devices (formerly Linear Technology) is a 100MHz current feedback amplifier optimized for high-speed video, cable driving, and data acquisition applications. It delivers 1000V/µs slew rate, ±50mA output drive, 1mV input offset voltage, and operates from ±5V to ±15V supplies. Its 8-lead SOIC package supports double-terminated 75Ω cable driving with 75ns settling to 0.1%.
For engineers reviewing the LT1223CS8#PBF datasheet, LT1223CS8#PBF pinout, LT1223CS8#PBF application, or LT1223CS8#PBF equivalent, key selection criteria include closed-loop bandwidth stability across gain settings, shutdown functionality via Pin 8, thermal settling behavior in noninverting configurations, and RF-resistor–dependent transient response optimization.
Technical Context
The LT1223CS8#PBF uses a current feedback architecture where closed-loop bandwidth remains stable across voltage gains (AV = 1 to 100) when RF is held constant - unlike voltage feedback op amps. Bandwidth is set by the Thevenin equivalent resistance at the inverting input and internal compensation capacitance, not by gain-bandwidth product.
Its input stage features 5MΩ input resistance and ±1µA bias current, while the output stage delivers ±50mA into 200Ω loads with 75ns 0.1% settling time. Shutdown is activated by sinking >200µA from Pin 8, reducing supply current to <3mA and placing the output in high-impedance state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Bandwidth | 100MHz at AV = 1 (RF = RG = 1kΩ); stable across gains 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); enables precision DC-coupled video and instrumentation signal paths |
| Output Current | ±50mA into 200Ω; sufficient to drive double-terminated 75Ω coaxial cables without external buffers |
| Supply Range | ±5V to ±15V (±4.5V to ±18V absolute max); supports industrial and broadcast power rails |
| Settling Time | 75ns to 0.1% (RF = RG = 1kΩ, VOUT = 10V step); critical for 8–12-bit ADC driver timing budgets |
| Shutdown Current | <3mA when Pin 8 sinks ≥200µA; enables low-power standby in multi-channel systems |
Pinout & Package
LT1223CS8#PBF is housed in an 8-lead plastic SOIC (S8) package, 150°C maximum junction temperature, 150°C/W θJA. Pin 1 is top-left corner (notch/dot indicator), standard industry pinout compatible with legacy DIP/SO footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (–IN) | Current-summing node; connects to feedback resistor (RF); sets transimpedance gain |
| 2 | Noninverting Input (+IN) | High-impedance voltage-sensing node (5MΩ || 1.5pF); common-mode range ±12V |
| 3 | V– | Negative supply rail; must be bypassed with 4.7µF tantalum within 0.5 inch |
| 4 | Shutdown | Sinks ≥200µA to enter low-power mode; open = normal operation; internal pull-up |
| 5 | V+ | Positive supply rail; same bypassing requirement as V– |
| 6 | Output | Class-AB output stage; ±50mA drive into 200Ω; high-Z in shutdown |
| 7 | Null | No internal connection; unused terminal (die pad tie-off) |
| 8 | Null | No internal connection; unused terminal (die pad tie-off) |
Key Features
| Feature | Design Value |
|---|---|
| Gain-bandwidth stability | Maintains ~100MHz bandwidth from AV = 1 to AV = 100 when RF fixed at 1kΩ - eliminates gain-dependent bandwidth trade-offs |
| Capacitive load drive | Drives up to 100pF directly (with RF increase) or isolated via 10–20Ω series resistor - avoids peaking from inverting-input capacitance |
| Thermal settling control | Noninverting config adds ~200µV/V of input common-mode change; predictable tail enables accurate 1mV settling design |
| DC precision | ±1mV VOS, ±1µA IB, 63dB CMRR - supports DC-coupled video and data acquisition front-ends |
| Supply flexibility | Operates from ±4.5V to ±18V; single-supply use possible with level-shifting; PSRR ≥68dB minimizes supply noise coupling |
Applications
| Video Cable Driver | IF/RF Amplifier |
|---|---|
|
Use Scenario: Driving 75Ω coaxial cable in broadcast equipment with double termination. IC Role / Device Role / Timing Role: High-output-current current feedback amplifier providing gain, bandwidth, and impedance matching. Use Value: Enables 100MHz signal integrity over 100m+ cable runs without external buffers or gain degradation at AV > 1. |
Use Scenario: Intermediate-frequency amplification in SDR receivers and spectrum analyzers. IC Role / Device Role / Timing Role: Wideband gain block with fast settling for agile frequency-hopping signals. Use Value: 75ns 0.1% settling supports rapid channel switching; 1000V/µs slew prevents distortion on pulsed IF waveforms. |
| Data Acquisition Driver | Buffer for High-Speed DACs |
|
Use Scenario: Driving 8-, 10-, or 12-bit ADC inputs in automated test equipment. IC Role / Device Role / Timing Role: Low-distortion, low-settling buffer between anti-alias filter and ADC sample capacitor. Use Value: 0.02% differential gain / 0.12° differential phase preserves video fidelity; 75ns settling meets 10MSPS sampling timing. |
Use Scenario: Output buffer for high-speed DACs (e.g., LTC2000) in waveform generation systems. IC Role / Device Role / Timing Role: Current-feedback output stage delivering fast transient response and low glitch energy. Use Value: ±50mA drive settles to 1mV in <100ns, minimizing DAC output droop and improving SFDR in wideband synthesizers. |
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 | Higher bandwidth but lower output drive (±30mA); unsuitable for 75Ω cable driving | Select LT1395CS6#TRMPBF only when >200MHz small-signal bandwidth is required and load ≤100Ω. |
| LT1206CN8#PBF | 60MHz bandwidth, 250mA output, 900V/µs slew, 8-lead PDIP, shutdown enabled | Lower bandwidth but higher current drive; better for heavy capacitive loads or long traces | Choose LT1206CN8#PBF when driving >100pF or requiring >200mA peak current, accepting 40MHz bandwidth reduction. |
Compared with LT1223CS8#PBF, LT1395CS6#TRMPBF trades output drive and shutdown for bandwidth and footprint size, while LT1206CN8#PBF sacrifices bandwidth to deliver 5× higher output current - making each suitable for distinct high-speed analog signal chain roles.
Availability
LT1223CS8#PBF is available at Aetrix Electronics and suitable for video instrumentation, high-speed data acquisition, and RF signal conditioning applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LT1223CS8#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 full product support, datasheets, and application engineering for legacy Linear parts including the LT1223 family.
The LT1223 belongs to Linear's high-speed current feedback amplifier product line, designed specifically for demanding video, communications, and data conversion signal paths where bandwidth stability across gain and fast settling are critical.
FAQ
What is the recommended feedback resistor value for LT1223CS8#PBF in unity-gain video buffer configuration?
The LT1223CS8#PBF achieves optimal 100MHz bandwidth and minimal peaking at unity gain with RF = RG = 1kΩ. Using this value ensures 75ns 0.1% settling and stable operation into 75Ω loads. Larger RF values reduce bandwidth proportionally; smaller values risk instability or overshoot unless layout parasitics are tightly controlled.
Does LT1223CS8#PBF support single-supply operation?
Yes, LT1223CS8#PBF supports single-supply operation down to +8V total (e.g., V– = 0V, V+ = 8V), but input common-mode range is limited to 0V to V+ – 2V and output swing reduces to ~0.5V to V+ – 1.5V. For rail-to-rail performance, external level-shifting or biasing is required - the device itself is not rail-to-rail.
How does shutdown functionality work on LT1223CS8#PBF?
LT1223CS8#PBF enters shutdown when Pin 8 sinks ≥200µA, reducing quiescent current to <3mA and placing the output in high-impedance state. No external pull-up is needed - an open-collector logic gate tied directly to Pin 8 suffices. Recovery time from shutdown is <1µs, enabling fast power cycling in multi-channel systems.
Can LT1223CS8#PBF drive capacitive loads directly?
LT1223CS8#PBF can drive up to 100pF directly if RF is increased per the "Maximum Capacitive Load vs Feedback Resistor" curve (e.g., RF = 2kΩ for 100pF). Alternatively, a 10–20Ω series resistor isolates the load without degrading DC accuracy - though it introduces gain error. Never place capacitance directly on the inverting input.
What is the thermal settling behavior of LT1223CS8#PBF in noninverting configurations?
In noninverting configurations, LT1223CS8#PBF exhibits ~200µV of thermal settling per volt of input common-mode change, resulting in ~2.5mV tail after a 10V step. This is predictable and independent of gain setting - unlike voltage feedback op amps - allowing accurate 1mV settling time budgeting in precision video and DAQ designs.
LT1223CS8#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1223CS8#PBF FAQ
1.How can I place an order for LT1223CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1223CS8#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 LT1223CS8#PBF reliable?
The price and inventory of LT1223CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1223CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1223CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1223CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1223CS8#PBF?
LT1223CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1223CS8#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 LT1223CS8#PBF?
For technical support, including LT1223CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1223CS8#PBF requirements.
6.How does Aetrix verify that LT1223CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1223CS8#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 LT1223CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1223CS8#PBF?
All LT1223CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1223CS8#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 LT1223CS8#PBF part is unused and in its original packaging.
Return procedure for LT1223CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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