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Analog Devices Inc. LT1226CS8#PBF
- Part No.:
- LT1226CS8#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LT1226CS8#PBF.pdf
- Description:
- IC OPAMP GP 1 CIRCUIT 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,061
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Product details
Overview
LT1226CS8#PBF from Analog Devices (formerly Linear Technology) is a low-noise, very high-speed voltage-feedback operational amplifier optimized for gain-of-25 stable operation. It delivers 1 GHz gain bandwidth, 400 V/µs slew rate, 2.6 nV/√Hz input noise voltage, and ±12 V output swing into 500 Ω with ±15 V supplies - making it suitable for precision video amplification and high-fidelity data acquisition front-ends.
For engineers reviewing the LT1226CS8#PBF datasheet, LT1226CS8#PBF pinout, LT1226CS8#PBF application, or LT1226CS8#PBF equivalent, key selection criteria include its guaranteed stability at noise gain ≥25, capacitive-load drive capability up to 10,000 pF, DC gain of ≥50 V/mV into 500 Ω, 100 ns settling time to 0.1% on 10 V step, and SOIC-8 package compatibility with legacy HA2541/AD847 layouts.
Technical Context
The LT1226CS8#PBF employs a single-stage bipolar complementary architecture enabling fast settling without multi-stage phase compensation penalties. Its internal slew enhancement circuitry balances rising and falling edge rates in noninverting configurations, eliminating asymmetry seen in conventional high-speed op-amps.
Stability is ensured at noise gain ≥25 via internal compensation; lower signal gains require lag networks or inverting topologies preserving effective noise gain ≥25. The amplifier maintains 94 dB CMRR and PSRR across ±5 V to ±15 V supply range while driving reactive loads without external isolation resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain Bandwidth Product | 1 GHz - Enables 40 MHz small-signal bandwidth at AV = +25 with controlled peaking |
| Slew Rate | 400 V/µs - Supports full-power 10 V step response within 100 ns (0.1% settling) |
| Input Noise Voltage | 2.6 nV/√Hz at 10 kHz - Critical for low-noise photodiode preamplifier and RF IF stages |
| DC Open-Loop Gain | 50 V/mV min into 500 Ω - Ensures <10 µV error in precision gain blocks with feedback resistors ≤5 kΩ |
| Input Offset Voltage | 1.0 mV max - Meets accuracy requirements in 12-bit data acquisition systems with gain ≥25 |
| Supply Range | ±2.5 V to ±15 V - Allows operation from dual ±5 V rails in portable instrumentation or ±15 V in lab-grade equipment |
| Capacitive Load Drive | Stable with all values - Eliminates need for series output resistors when driving coaxial cables or ADC input capacitance |
Pinout & Package
LT1226CS8#PBF is housed in an 8-lead plastic SOIC (S8) package with standard JEDEC MS-012AC footprint (5.0 mm × 6.2 mm), 1.27 mm lead pitch, and 130°C/W junction-to-ambient thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 8 | Null Offset Adjustment | Connect external 10 kΩ potentiometer wiper to Pin 1, ends to V+ and V– for <1 mV offset trimming |
| 2 | Inverting Input (–IN) | Differential input node; requires matched source impedance to Pin 3 for optimal DC accuracy |
| 3 | Noninverting Input (+IN) | Differential input node; common-mode range extends to ±VS – 1 V |
| 4 | Negative Supply (V–) | Return path for bias current; must be decoupled with 0.1 µF ceramic capacitor near pin |
| 5 | Output (OUT) | Class-AB output stage capable of ±40 mA short-circuit current and driving 150 Ω loads to ±3 V on ±5 V rails |
| 6 | Positive Supply (V+) | Power rail; requires parallel 0.1 µF ceramic + 1 µF tantalum bypassing for high-current transient response |
| 7 | Not Connected (NC) | No internal connection; must remain unconnected or grounded per layout best practices |
Key Features
| Feature | Design Value |
|---|---|
| Gain-of-25 Stability | Internally compensated for unity-gain unstable but noise-gain ≥25 stable operation - enables wideband gain blocks without external compensation |
| Capacitive Load Immunity | Active pole-sensing compensation maintains stability with 0–10,000 pF loads - eliminates series isolation resistors in cable driver applications |
| Symmetrical Slew Enhancement | Patented circuit balances rising/falling edge slew rates in noninverting mode - reduces distortion in pulse and video amplification |
| Wide Supply Flexibility | Operates from ±2.5 V to ±15 V - supports both low-voltage portable designs and high-dynamic-range industrial signal chains |
| High DC Precision | 1.0 mV max VOS and 50 V/mV min AVOL ensure sub-LSB error in 12-bit systems using gain ≥25 |
Applications
| Video Signal Amplification | Data Acquisition Front-End |
|---|---|
Use Scenario: Amplifying composite video signals (3.58 MHz NTSC) with minimal differential gain/phase error. IC Role / Device Role / Timing Role: Noninverting gain-of-25 buffer driving 75 Ω coaxial cable with double termination. Use Value: 0.7% differential gain and 0.6° differential phase error preserve color fidelity without post-correction. | Use Scenario: Conditioning sensor outputs prior to 12-bit SAR ADC sampling at 1 MSPS. IC Role / Device Role / Timing Role: High-speed, low-noise gain stage with 100 ns 0.1% settling ensures accurate sample-and-hold timing. Use Value: 2.6 nV/√Hz input noise and 1 mV VOS limit quantization uncertainty to <0.5 LSB at 25× gain. |
| Photodiode Preamplifier | Cable Driver for Test Equipment |
Use Scenario: Transimpedance amplification of low-light photodiode current in optical measurement systems. IC Role / Device Role / Timing Role: Inverting configuration with 5.1 kΩ feedback resistor achieving 15 MHz bandwidth at AV = 5.1 kΩ. Use Value: 1 GHz GBW enables wide closed-loop bandwidth while 400 V/µs slew rate prevents pulse distortion on fast light pulses. | Use Scenario: Driving 50 Ω or 75 Ω transmission lines in automated test equipment waveform generators. IC Role / Device Role / Timing Role: Unity-gain buffer with series 200 Ω output resistor for proper cable termination. Use Value: Stable drive into reactive loads eliminates ringing; ±12 V swing on ±15 V supplies supports full-scale test signal generation. |
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 |
|---|---|---|---|
| AD847JRZ | Lower GBW (50 MHz), higher VOS (1.5 mV), no capacitive-load immunity - requires external compensation for >100 pF loads | Best suited for medium-bandwidth precision gain blocks where load stability is not required | Select AD847JRZ only when bandwidth ≤50 MHz suffices and board layout allows strict input capacitance control |
| EL2020CSZ | Higher supply current (12 mA), lower slew rate (250 V/µs), same 1 GHz GBW but limited to ±12 V max supply | Preferred for low-distortion audio line drivers where power efficiency is secondary to THD performance | Choose EL2020CSZ when operating from ±12 V rails and harmonic distortion <0.02% is prioritized over slew-limited transient fidelity |
Compared with LT1226CS8#PBF, AD847JRZ trades bandwidth and load drive for lower cost and wider availability in DIP packages, while EL2020CSZ offers better THD at the expense of higher quiescent power and reduced supply headroom - neither matches the LT1226CS8#PBF's combination of 1 GHz GBW, 400 V/µs slew rate, and unconditional capacitive-load stability in SOIC-8.
Availability
LT1226CS8#PBF is available at Aetrix Electronics and suitable for video signal conditioning, high-speed data acquisition, photodiode preamplification, and test equipment cable driving requiring stable component supply across extended temperature and voltage ranges.
Supply support for LT1226CS8#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. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing ICs for precision and high-speed applications.
The LT1226 product line was designed by Linear Technology specifically for wideband, low-noise, high-slew-rate amplification in data acquisition, video, and instrumentation systems where gain-of-25 stability and capacitive-load drive are mandatory.
FAQ
What is the minimum stable noise gain for LT1226CS8#PBF?
The LT1226CS8#PBF is internally compensated for stable operation at noise gain ≥25. Configurations with lower signal gain - such as inverting amplifiers with |AV| = 24 - remain stable because their noise gain equals 25. Attempting unity-gain or gain-of-5 configurations without external lag compensation will cause oscillation. Always verify noise gain, not just signal gain, when designing with LT1226CS8#PBF.
Can LT1226CS8#PBF drive a 75 Ω coaxial cable directly?
Yes, LT1226CS8#PBF can drive 75 Ω coaxial cable directly, but optimal pulse fidelity requires double termination: a 75 Ω series resistor at the output and a 75 Ω shunt resistor at the load end. This prevents reflections that degrade rise time and cause overshoot. The LT1226CS8#PBF's ability to deliver ±40 mA output current and maintain stability with reactive loads makes it well-suited for this role without added isolation components.
What is the maximum capacitive load LT1226CS8#PBF can drive without oscillation?
The LT1226CS8#PBF is specified as stable with "all capacitive loads", verified up to 10,000 pF in production testing. At 1000 pF, the small-signal response shows 55% peaking; at 10,000 pF, large-signal slewing becomes current-limited. While oscillation does not occur, bandwidth and phase margin decrease progressively with load capacitance - system-level verification is recommended for loads >1000 pF in critical timing applications involving LT1226CS8#PBF.
Does LT1226CS8#PBF require external offset nulling in precision applications?
LT1226CS8#PBF features dedicated offset null pins (1 and 8) and guarantees ≤1.0 mV input offset voltage at room temperature. For applications demanding <100 µV offset - such as 16-bit data acquisition - external nulling using a 10 kΩ potentiometer is recommended. The nulling network connects between V+ and V–, with the wiper to Pin 1; this adjustment reduces residual offset without degrading noise or bandwidth performance of LT1226CS8#PBF.
How does LT1226CS8#PBF compare to AD847 in pin compatibility and layout?
LT1226CS8#PBF is not pin-compatible with AD847 - AD847 uses an 8-lead SOIC but assigns Pin 1 to +IN and Pin 2 to –IN, whereas LT1226CS8#PBF places –IN on Pin 2 and +IN on Pin 3. However, LT1226CS8#PBF can be substituted in AD847 circuits if the PCB layout accommodates re-routing of input connections and removal of AD847's external nulling network. The LT1226CS8#PBF's superior GBW and slew rate justify redesign effort in bandwidth-critical upgrades.
LT1226CS8#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:
- General Purpose
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- 400V/µs
- Gain Bandwidth Product:
- 1 GHz
- -3db Bandwidth:
- -
- Current - Input Bias:
- 4 µA
- Voltage - Input Offset:
- 300 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:
- Surface Mount
- Supplier Device Package:
- 8-SO
LT1226CS8#PBF FAQ
1.How can I place an order for LT1226CS8#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT1226CS8#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 LT1226CS8#PBF reliable?
The price and inventory of LT1226CS8#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT1226CS8#PBF is usually 5 days.
3.What payment methods are accepted for LT1226CS8#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT1226CS8#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT1226CS8#PBF?
LT1226CS8#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT1226CS8#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 LT1226CS8#PBF?
For technical support, including LT1226CS8#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT1226CS8#PBF requirements.
6.How does Aetrix verify that LT1226CS8#PBF is sourced from the original manufacturer or authorized distributors?
All LT1226CS8#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 LT1226CS8#PBF meets industry standards.
7.What is the process for return or replacement of LT1226CS8#PBF?
All LT1226CS8#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT1226CS8#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 LT1226CS8#PBF part is unused and in its original packaging.
Return procedure for LT1226CS8#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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