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Rarely Asked QuestionsBootstrapping a Low Voltage Op Amp to Operate with High Voltage Signals and Supplies
Features and Benefits
- 0.1Hz to 10Hz Noise: 550nVP-P
- Input Bias Current:
- 0.2pA (Typ at 25°C)
- 1pA Max (LTC6240)
- Low Offset Voltage: 125μV Max
- Low Offset Drift: 2.5μV/°C Max
- Gain Bandwidth Product: 18MHz
- Output Swings Rail-to-Rail
- Supply Operation:
- 2.8V to 6V LTC6240/LTC6241/LTC6242
- 2.8V to ±5.5V LTC6240HV/LTC6241HV/LTC6242HV
- Low Input Capacitance
- H-Grade Temperature Range: –40°C to 125°C
- Single LTC6240 in 5-Pin Low Profile (1mm) ThinSOT™ Package and 8-Pin SO for PCB Guard Ring
- Dual LTC6241 in 8-Pin SO and Tiny DFN Packages
- Quad LTC6242 in 16-Pin SSOP and 5mm × 3mm DFN Packages
The LTC6240/6241/LTC6242 are single, dual and quad low noise, low offset, rail-to-rail output, unity gain stable CMOS op amps that feature 1pA of input bias current. Input bias current is guaranteed to be 1pA max on the single LTC6240. The 0.1Hz to 10Hz noise of only 550nVP-P, along with an offset of just 125μV are significant improvements over traditional CMOS op amps. Additionally, noise is guaranteed to be less than 10nV/√Hz at 1kHz. An 18MHz gain bandwidth, and 10V/μs slew rate, along with the wide supply range and low input capacitance, make them perfect for use as fast signal processing amplifiers.
These op amps have an output stage that swings within 30mV of either supply rail to maximize the signal dynamic range in low supply applications. The input common mode range extends to the negative supply. They are fully specified on 3V and 5V, and an HV version guarantees operation on supplies up to ±5V.
The LTC6240 is available in the 8-pin SO and the 5-pin SOT-23 packages. The LTC6241 is available in the 8-pin SO, and for compact designs it is packaged in a tiny dual fine pitch leadless (DFN) package. The LTC6242 is available in the 16-pin SSOP as well as the 5mm × 3mm DFN package.
- Photo Diode Amplifiers
- Charge Coupled Amplifiers
- Low Noise Signal Processing
- Medical Instrumentation
- High Impedance Transducer Amplifier
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Tools & Simulations
LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Models for the following parts are available in LTspice:
Use the Analog Filter Wizard to design low-pass, high-pass, or band-pass filters with actual op amps in minutes. As you progress through the design process, you can observe the characteristics of your filter design from ideal specifications to real world circuit behavior. Quickly evaluate the tradeoffs in op amp specifications - including gain-bandwidth, noise, and supply current – to determine the best filter design for your requirements.
LTC6240 Companion Parts
Recommended Related Parts
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Sample & Buy
The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.