Features
- Ultra-high precision front-end amplifier
- Zero-drift instrumentation amplifier
- Pin selectable 9 gain settings: G = 1 to 1,000
- Rail-to-rail input/output
- Single-ended output
- RFI filtered inputs improve EMI rejection
- Single supply: 2.5V to 5.5V
- Dual supply: ±1.25V to ±2.75V
- Low input offset: 5μV, Maximum
- Low input offset drift: 50nV/°C, Maximum
- High CMRR: 138dB, G = 100
- Low gain error: <0.4%, All Gains, Maximum
- Gain bandwidth: 2.3MHz
- Input voltage noise (0.1Hz to 10Hz): 0.4μVP-P
- Operating temperature range: -40 °C to +125 °C
ISL2853x Functional Diagram
Description
The ISL28535 is a 5V zero-drift rail-to-rail input/output (RRIO) Programmable Gain Instrumentation Amplifiers (PGIA). This instrumentation amplifier features low offset, low noise, low gain error, and high CMRR. It is ideal for high precision applications over the wide industrial temperature range. This in-amp is designed with a unique 2-bit, 3-state logic interface that allows up to 9 selectable gain settings. The ISL2853x single-ended output amplifier includes an additional uncommitted zero-drift amplifier, useful to buffer the REF input or used as a precision amplifier.
Applications
- Pressure and strain gauge transducers
- Weight scales
- Flow sensors
- Biometric: ECG/blood glucose
- Temperature sensors
- Test and measurement
- Data acquisition systems
- Low ohmic current sense
| Part Number | Status | Samples | Stock | RoHS | Package | Lead Count (#) | Carrier Type | Moisture Sensitivity Level (MSL) | Pb (Lead) Free | Pb Free Category | Temp. Range (°C) |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ISL28535FVZ | Obsolete | N/A | Out of Stock | RoHS:EN | TSSOP | 14# | Tube | 2 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +125°C |
| ISL28535FVZ-T13 | Obsolete | N/A | Out of Stock | RoHS:EN | TSSOP | 14# | Reel | 2 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -40 to +125°C |
| ISL28535FVZ-T7A | Obsolete | N/A | In Stock | RoHS:EN | TSSOP | 14# | Reel | 2 | Yes | Pb-Free 100% Matte Tin Plate w/Anneal-e3 | -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 248 KB r13an0007eu-isl2853x-diamond-plot May 18, 2020
- Application NotePDF 284 KB r13an0006eu-bias-isl2853x-isl2863x May 15, 2020AI-generated Summary: Instrumentation amplifiers require proper DC biasing at their inputs and outputs to function correctly. Input biasing involves referencing inputs to a common-mode voltage (VCM) via bias resistors, ensuring correct transistor operation. Different sensor types, such as DC bridge sensors and thermocouples, have specific biasing needs. AC-coupled inputs require additional biasing to avoid floating inputs. Output biasing sets the output reference voltage (VREF) to center the output range, typically ground in dual supply systems or derived from the supply in single supply systems. Using a voltage reference IC for VREF improves accuracy, PSRR, and CMRR. Ratio-metric applications maintain VREF proportional to supply voltage, using buffered voltage dividers and low-pass filtering to minimize noise and errors.
- Application NotePDF 185 KB r13an0005eu-cascading-instrumentation-amplifiers May 15, 2020AI-generated Summary: Cascading instrumentation amplifiers achieves high gain while maintaining high bandwidth, overcoming the bandwidth limitations of single-stage amplifiers at high gain. Using three cascaded ISL28634 devices, each set to a gain of 10, results in an overall gain of 1000 with a bandwidth of 136kHz, significantly higher than a single amplifier at the same gain. This approach also reduces low-frequency noise compared to a single amplifier operating at high gain. Gain settings are digitally programmable and controlled via GPIO, enabling flexible gain adjustment in powers of 10 for applications requiring precise amplification with low noise and high bandwidth.
- Application NotePDF 324 KB r13an0004eu-instrumentation-amps Apr 02, 2020AI-generated Summary: High-precision instrumentation amplifiers feature zero-drift architecture, nine programmable gain settings, and rail-to-rail inputs/outputs, enabling accurate amplification of small differential signals amid large common-mode voltages. The input stage distinguishes gain for common-mode and differential signals to prevent saturation. The ISL2853x offers a single-ended output with an uncommitted zero-drift op-amp, while the ISL2863x provides a fully differential output. Gain settings are configurable via pin-strapping or microcontroller control, with internal safeguards against saturation. Practical examples include strain gauge sensor amplification and output stage operation, emphasizing precise signal conditioning across industrial temperature ranges.
- Application NotePDF 263 KB r13an0003eu0100-biasing-op-amps Dec 06, 2019AI-generated Summary: Proper biasing of operational amplifiers is essential to avoid malfunction in AC-coupled circuits. A missing DC bias path causes long stabilization times and potential failures. Adding input resistors to ground provides a DC path for bias currents, minimizing offset errors. For single-supply AC-coupled amplifiers, biasing uses a reference voltage, ideally from a high-PSRR voltage reference or buffered voltage divider, to maintain signal symmetry and reduce noise. Understanding frequency responses of input and feedback components is crucial for setting bandwidth and gain characteristics.
- 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.
- DatasheetPDF 2.21 MB isl28533-534-535-633-634-635 Aug 07, 2013
- 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 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.
- DatasheetPDF 2.21 MB isl28533-534-535-633-634-635 Aug 07, 2013
Recommended Documents (1)
- DatasheetPDF 2.21 MB isl28533-534-535-633-634-635 Aug 07, 2013
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 248 KB r13an0007eu-isl2853x-diamond-plot May 18, 2020
- Application NotePDF 284 KB r13an0006eu-bias-isl2853x-isl2863x May 15, 2020AI-generated Summary: Instrumentation amplifiers require proper DC biasing at their inputs and outputs to function correctly. Input biasing involves referencing inputs to a common-mode voltage (VCM) via bias resistors, ensuring correct transistor operation. Different sensor types, such as DC bridge sensors and thermocouples, have specific biasing needs. AC-coupled inputs require additional biasing to avoid floating inputs. Output biasing sets the output reference voltage (VREF) to center the output range, typically ground in dual supply systems or derived from the supply in single supply systems. Using a voltage reference IC for VREF improves accuracy, PSRR, and CMRR. Ratio-metric applications maintain VREF proportional to supply voltage, using buffered voltage dividers and low-pass filtering to minimize noise and errors.
- Application NotePDF 185 KB r13an0005eu-cascading-instrumentation-amplifiers May 15, 2020AI-generated Summary: Cascading instrumentation amplifiers achieves high gain while maintaining high bandwidth, overcoming the bandwidth limitations of single-stage amplifiers at high gain. Using three cascaded ISL28634 devices, each set to a gain of 10, results in an overall gain of 1000 with a bandwidth of 136kHz, significantly higher than a single amplifier at the same gain. This approach also reduces low-frequency noise compared to a single amplifier operating at high gain. Gain settings are digitally programmable and controlled via GPIO, enabling flexible gain adjustment in powers of 10 for applications requiring precise amplification with low noise and high bandwidth.
- Application NotePDF 324 KB r13an0004eu-instrumentation-amps Apr 02, 2020AI-generated Summary: High-precision instrumentation amplifiers feature zero-drift architecture, nine programmable gain settings, and rail-to-rail inputs/outputs, enabling accurate amplification of small differential signals amid large common-mode voltages. The input stage distinguishes gain for common-mode and differential signals to prevent saturation. The ISL2853x offers a single-ended output with an uncommitted zero-drift op-amp, while the ISL2863x provides a fully differential output. Gain settings are configurable via pin-strapping or microcontroller control, with internal safeguards against saturation. Practical examples include strain gauge sensor amplification and output stage operation, emphasizing precise signal conditioning across industrial temperature ranges.View More (9)
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This video examines the use of instrumentation amplifiers (INA or in amps) for sensor applications. Intersil discusses the basics of the three-op amp INA, advantages of the zero-drift amplifiers, why use an RF input filter, monitoring sensor health, the advantages of programmable gain amplifiers and concludes with application examples for a sensor health monitor and an active shield guard drive.
Support Communities
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ISL28535 EOL
Hello, I have noticed that the ISL28535 chip has become obsolete:ISL28535 - 5V, Rail-Rail I/O, Zero-Drift, Single Ended Output Programmable Gain Instrumentation Amplifier | RenesasIt is just perfect for my applications, and although there is some stock left on UK RS, Digikey, and Mouser, I wanted to ...
Mar 26, 2024 -
ISL28535EV2Z Programmable Instrument Amplifier
Hi, I am using a single supply 3.9volt lithium DC power source for V+ and V-. I am inputting an analogue voltage signal that varies from +64 micro volts to +64000 micro volts. I shorted out R22 as per application notes and connected AMP IN+ to TP8. What must ...
Feb 16, 2020
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