Features
- 4.5MHz gain bandwidth product
- 900µA supply current (per amplifier)
- 300µV maximum offset voltage
- 1pA typical input bias current
- Down to 2.4V single supply voltage range
- Rail-to-rail input and output
- Output sources and sinks 60mA load current
- Enable pin (ISL28138)
- -40°C to +125°C operation
- Pb-free (RoHS compliant)
ISL28138 Functional Diagram
Description
Support is limited to customers who have already adopted these products.
The ISL28138 and ISL28238 are 4. 5MHz low-power single and dual operational amplifiers. The parts are optimized for single supply operation from 2. 4V to 5. 5V, allowing operation from one lithium cell or two Ni-Cd batteries. The parts feature an Input Range Enhancement Circuit (IREC) which enables them to maintain CMRR performance for input voltages greater than the positive supply. The input signal is capable of swinging 0. 25V above the positive supply and to 100mV below the negative supply with only a slight degradation of the CMRR performance. The output operation is rail-to-rail. The parts draw minimal supply current (900µA per amplifier) while meeting excellent DC accuracy, AC performance, noise and output drive specifications. The ISL28138 features an enable pin that can be used to turn the device off and reduce the supply current to less than 20µA. Operation is guaranteed over -40°C to +125°C temperature range.
Applications
- Low-end audio
- 4mA to 20mA current loops
- Medical devices
- Sensor amplifiers
- ADC buffers
- DAC output amplifiers
| Part Number | Status | Samples | Stock | Package | Lead Count (#) | Carrier Type | Pitch (mm) | Pkg. Dimensions (mm) | Pb (Lead) Free | Temp. Range (°C) |
|---|---|---|---|---|---|---|---|---|---|---|
| ISL28138FBZ | Obsolete | N/A | Out of Stock | SOICN | 8# | Tube | 1.3mm | 4.9 x 3.9 x 0.00 | No | -40 to +125°C |
| ISL28138FBZ-T7 | Obsolete | N/A | In Stock | SOICN | 8# | Reel | 1.3mm | 4.9 x 3.9 x 0.00 | No | -40 to +125°C |
| ISL28138FHZ-T7 | Obsolete | N/A | Out of Stock | SOT23 | 6# | Reel | 1mm | 2.9 x 1.6 x 0.00 | No | -40 to +125°C |
| ISL28138FHZ-T7A | Obsolete | N/A | In Stock | SOT23 | 6# | Reel | 1mm | 2.9 x 1.6 x 0.00 | No | -40 to +125°C |
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- Application NotePDF 992 KB R13AN0012EU0101 Rev.1.01 Feb 07, 2022AI-generated Summary: Current sensing techniques include low-side and high-side sensing using low-voltage precision op-amps combined with current sense resistors. Low-side sensing places the resistor between load and ground, offering simplicity and low cost but limited short-circuit detection. High-side sensing places the resistor between supply and load, enabling short-circuit detection but requiring higher complexity and level shifting. Current-sense resistors convert current to voltage linearly, with key parameters such as tolerance, temperature coefficient, and power rating affecting accuracy. Low-side sensing uses non-inverting amplifiers with tight offset voltage requirements, while high-side sensing employs output transistors to maintain voltage balance. Ultra-low offset amplifiers allow smaller sense resistors, reducing power loss and improving measurement range.
- Application NotePDF 564 KB an1993 May 22, 2018AI-generated Summary: Voltage feedback (VFB) amplifiers use a differential input pair, a high-impedance stage, and an output buffer to convert input voltage differences into output voltage. The VFB amplifier's gain decreases at a dominant pole frequency due to compensation capacitors. Current feedback (CFB) amplifiers include a class AB input amplifier, current mirror, high-impedance stage, and output buffer. CFB amplifiers provide faster switching and higher slew rates by drawing charge/discharge currents directly from supply rails, unlike VFB amplifiers which are limited by biasing current sources.
- Model - SPICETXT 2 KB isl28138-design-model Nov 17, 2017
- End Of Life NoticePDF 93 KB PLC11062 Jun 29, 2011
- Application NotePDF 357 KB an1694 Jan 19, 2004AI-generated Summary: The document outlines the four fundamental internal blocks of an operational amplifier and presents a simple 2:1 stage circuit diagram. It includes important legal notices from Renesas Electronics regarding the use, liability, and intellectual property rights of their semiconductor products. The document clarifies product quality grades, intended applications, and restrictions on use in life-critical or hazardous systems. It emphasizes compliance with applicable laws and safety responsibilities when using Renesas products. Contact information for Renesas sales offices worldwide is also provided.
- Application NotePDF 1.02 MB an1613 Jan 19, 2004AI-generated Summary: The document details the process of importing SPICE netlists into Allegro Design Entry CIS for simulation. It guides users through verifying no errors during schematic translation, associating and replacing symbols for SPICE models, and mapping model pins to symbol pins. It also explains setting up new projects, creating simulation profiles, adding libraries, and configuring analysis types such as AC Sweep/Noise. The instructions emphasize selecting appropriate symbols based on pin count and ensuring all files reside in the same directory for smooth simulation setup.
- Application NotePDF 556 KB an1561 Jan 19, 2004AI-generated Summary: This document investigates radiated interference in audio circuits using precision amplifiers. It compares the ISL28291 bipolar input and EL5220 MOSFET input operational amplifiers across frequencies from 100kHz to 6GHz. Results show the EL5220 exhibits significantly lower interference, especially in Bluetooth frequency bands. Higher feedback resistor values and RFI capacitors reduce interference, but placing the antenna near the IC increases it. MOSFET inputs prove less susceptible to interference than bipolar types. Antenna placement and radiation patterns critically affect circuit performance in sensitive audio applications.
- Application NotePDF 2.04 MB an1560 Jan 19, 2004AI-generated Summary: This document explains how to accurately measure voltage and current noise in operational amplifiers down to 0.1Hz. It details the importance of setting the post amplifier gain to overcome the dynamic signal analyzer's noise floor, using external AC coupling to avoid measurement errors, and employing a Faraday cage to reduce environmental noise. It also discusses selecting the appropriate series resistor to distinguish current noise from Johnson noise and optimizing measurement algorithms to separate internal and external noise components.
- Application NotePDF 976 KB an1556 Jan 19, 2004AI-generated Summary: The document details building an accurate SPICE model for low noise, low power precision amplifiers, focusing on the ISL28127 device. It explains the modeling of various amplifier stages, including the voltage noise stage, input stage, gain stages, mid supply reference, common mode gain, supply isolation, and output stage. Key modeling techniques involve noise reduction, gain setting, current sourcing, and output short circuit protection. The document also describes how voltage-controlled current sources operate within the model to simulate amplifier behavior accurately.
- Application NotePDF 843 KB an535 Jun 05, 2002AI-generated Summary: A Data Acquisition System (DAS) requires careful design of signal conditioning, transducer selection, and signal transmission to ensure high accuracy. Signal conditioning includes multiplexing, amplification, filtering, and calibration, ideally performed near the transducer. Transducers convert physical variables to electrical signals, often voltage, with low source resistance preferred. Signal paths can be single-ended or differential; differential paths better reject common mode noise, especially for low-level signals. Shielded twisted pairs and balanced lines reduce interference. Filters, typically Butterworth low-pass, prevent aliasing and maintain signal integrity.
Recommended Documents (1)
Datasheets (1)
Manuals & Guides (1)
- Application NotePDF 992 KB R13AN0012EU0101 Rev.1.01 Feb 07, 2022AI-generated Summary: Current sensing techniques include low-side and high-side sensing using low-voltage precision op-amps combined with current sense resistors. Low-side sensing places the resistor between load and ground, offering simplicity and low cost but limited short-circuit detection. High-side sensing places the resistor between supply and load, enabling short-circuit detection but requiring higher complexity and level shifting. Current-sense resistors convert current to voltage linearly, with key parameters such as tolerance, temperature coefficient, and power rating affecting accuracy. Low-side sensing uses non-inverting amplifiers with tight offset voltage requirements, while high-side sensing employs output transistors to maintain voltage balance. Ultra-low offset amplifiers allow smaller sense resistors, reducing power loss and improving measurement range.
- Application NotePDF 564 KB an1993 May 22, 2018AI-generated Summary: Voltage feedback (VFB) amplifiers use a differential input pair, a high-impedance stage, and an output buffer to convert input voltage differences into output voltage. The VFB amplifier's gain decreases at a dominant pole frequency due to compensation capacitors. Current feedback (CFB) amplifiers include a class AB input amplifier, current mirror, high-impedance stage, and output buffer. CFB amplifiers provide faster switching and higher slew rates by drawing charge/discharge currents directly from supply rails, unlike VFB amplifiers which are limited by biasing current sources.
- Application NotePDF 357 KB an1694 Jan 19, 2004AI-generated Summary: The document outlines the four fundamental internal blocks of an operational amplifier and presents a simple 2:1 stage circuit diagram. It includes important legal notices from Renesas Electronics regarding the use, liability, and intellectual property rights of their semiconductor products. The document clarifies product quality grades, intended applications, and restrictions on use in life-critical or hazardous systems. It emphasizes compliance with applicable laws and safety responsibilities when using Renesas products. Contact information for Renesas sales offices worldwide is also provided.
- Application NotePDF 1.02 MB an1613 Jan 19, 2004AI-generated Summary: The document details the process of importing SPICE netlists into Allegro Design Entry CIS for simulation. It guides users through verifying no errors during schematic translation, associating and replacing symbols for SPICE models, and mapping model pins to symbol pins. It also explains setting up new projects, creating simulation profiles, adding libraries, and configuring analysis types such as AC Sweep/Noise. The instructions emphasize selecting appropriate symbols based on pin count and ensuring all files reside in the same directory for smooth simulation setup.
- Application NotePDF 556 KB an1561 Jan 19, 2004AI-generated Summary: This document investigates radiated interference in audio circuits using precision amplifiers. It compares the ISL28291 bipolar input and EL5220 MOSFET input operational amplifiers across frequencies from 100kHz to 6GHz. Results show the EL5220 exhibits significantly lower interference, especially in Bluetooth frequency bands. Higher feedback resistor values and RFI capacitors reduce interference, but placing the antenna near the IC increases it. MOSFET inputs prove less susceptible to interference than bipolar types. Antenna placement and radiation patterns critically affect circuit performance in sensitive audio applications.View More (8)
Application Notes & White Papers (8)
- End Of Life NoticePDF 93 KB PLC11062 Jun 29, 2011
Product Notices (PCN, EOL, etc) (1)
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- Model - SPICETXT 2 KB isl28138-design-model Nov 17, 2017
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