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ISL21090B75

Obsolete

Ultra-Low Noise, Precision Voltage Reference with 7.5 VOUT

Features

  • Reference output voltage option
  • 1.25V, 2.5V, 5.0V, and 7.5V
  • Initial accuracy:
    • ISL21090-12: ±0.03%
    • ISL21090-25: ±0.02%
    • ISL21090-50: ±0.025%
    • ISL21090-75: ±0.035%
  • Output voltage noise (0.1Hz to 10Hz): 1.0µVP-P typ (1.25V option)
  • Supply current : 750µA (1.25V option)
  • Temperature coefficient: 7ppm/°C max
  • Output current capability: 20mA
  • Line regulation: 6ppm/V (1.25V option)
  • Load regulation: 2.5ppm/mA (1.25V option)
  • Operating temperature range: -40 °C to +125 °C
Find Other Products in Voltage References
ISL21090Bxx Functional Diagram
ISL21090Bxx Functional Diagram

Description

The ISL21090 is an ultra-low noise, high DC accuracy precision voltage reference with a wide input voltage range. The ISL21090 uses Renesas' Advanced Bipolar technology to achieve sub 1.0µVP-P (1.25V option) 0.1Hz to 10Hz noise with an initial voltage accuracy of 0.02% (2.5V option). The ISL21090 offers 1.25V, 2.5V, 5.0V, and 7.5V output voltage options with a 7ppm/°C temperature coefficient and also provides excellent line and load regulation. These devices are offered in an 8 Ld SOIC package. The ISL21090 is ideal for high-end instrumentation, data acquisition and processing applications requiring high DC precision where low noise performance is critical.

Applications

  • High-end instrumentation
  • Precision voltage sources for data acquisition system,
  • industrial control, communication infrastructure
  • Process control and instrumentations
  • Active source for sensors
Part NumberStatusSamplesStockRoHSPackageLead Count (#)Carrier TypeMoisture Sensitivity Level (MSL)Pb (Lead) FreePb Free CategoryTemp. Range (°C)
ISL21090BFB875Z-TKObsoleteN/AIn StockRoHS:EN
SOICN8#Reel2YesPb-Free 100% Matte Tin Plate w/Anneal-e3-40 to +125°C
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    Recommended Documents (1)

  1. Datasheet
    ISL21090 Datasheet
    RECOMMENDED
    PDF 1.72 MB isl21090 Jan 27, 2010

    Datasheets (1)

  1. Datasheet
    ISL21090 Datasheet
    RECOMMENDED
    PDF 1.72 MB isl21090 Jan 27, 2010

    Manuals & Guides (1)

  1. Manual - Development Tools
    ISL21090xxEV1Z User Guide
    PDF 360 KB an1764 Feb 02, 2007

    Application Notes & White Papers (3)

  1. Application Note
    AN177: Voltage Reference Application and Design Note
    PDF 1.39 MB an177 Jun 13, 2005
    AI-generated Summary: Bandgap voltage references generate stable output voltages by combining two temperature-dependent voltages to cancel temperature drift, typically around 1.24V. They operate with low voltage (<5V), low current (<1mA), and moderate temperature drift (>20ppm/°C). Buried Zener references offer low noise and temperature drift but require higher voltage (>7V) and current (>1.5mA). Intersil Floating Gate Analog technology stores precise voltages on a floating gate, achieving very low temperature drift (1ppm/°C), high accuracy, and ultra-low current (<1µA). Key specs include absolute accuracy and temperature coefficient, with advanced methods to measure and reduce drift.
  2. Application Note
    AN9675: A Tutorial in Coherent and Windowed Sampling with A/D Converters
    PDF 503 KB an9675 Aug 13, 1999
    AI-generated Summary: Effective Number of Bits (ENOB) depends critically on precise coherence in A/D sampling, with small frequency shifts significantly impacting accuracy. Unwrapping reconstructs coherently sampled sine waves, while windowing controls spectral leakage by shaping the acquisition window. Resampling and interpolation adjust sample sets to avoid leakage in FFT analysis. Different window functions balance side lobe levels and bandwidth, affecting spectral resolution and leakage reduction.
  3. Application Note
    AN9705: A Theoretical View of Coherent Sampling
    PDF 287 KB an9705 Feb 21, 1997
    AI-generated Summary: Coherent sampling requires the ratio of signal frequency to sampling frequency to be a rational number, expressed as ko/N. When this condition is not met, frequency smearing occurs across bins. Data Acquisition Systems (DAS) can mitigate this by windowing, fixing sampling frequency and tuning input frequency, or fixing input frequency and tuning sampling frequency. The latter two methods are practical for most systems. Pseudo-code illustrates the frequency response for non-integer ko values.

    Product Notices (PCN, EOL, etc) (1)

  1. End Of Life Notice
    PLC21035 - End of Life Notice
    PDF 1.17 MB Jun 25, 2021

    Schematics & Design Files (1)

  1. PCB Design Files
    ISL21090xxEV1ZBOM Design Files
    ZIP 140 KB isl21090xxev1zbom_design Nov 17, 2017

    Marketing Collateral (1)

  1. Brochure
    Analog ICs Brochure
    PDF 5.43 MB R07CL0009EJ0800 Rev.8.00 日本語 Nov 10, 2025

Renesas Boards & Kits

ISL21090xxEV1Z Precision Voltage Reference Evaluation Boards
ISL21090xxEV1Z Active

Ultra-Low Noise, Precision Voltage Reference Evaluation Boards

The ISL21090xxEV1Z evaluation board is designed to measure the performance of the high-precision ISL21090 voltage references. The reference has a wide input voltage range from 3.7V to 36V and an initial accuracy of 0.02% (2.5V option). The voltage noise of less than 2µVP-P in the 0.1Hz to 10Hz... Read More

Recommended Documents:
ISL21090xxEV1Z User Guide
Order Now
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    Software & Tools (1)

  1. PCB Design Files
    ISL21090xxEV1ZBOM Design Files
    ZIP 140 KB isl21090xxev1zbom_design Nov 17, 2017
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Knowledge Base

  1. ISL21090 Recommended Compensation Capacitor

    The recommended value varies with the output capacitance. The following tables show the recommended values. 1.25 VOUT   Cout (uF) Ccomp (nF) 0.1 1 1 10 10 30   2.5, 5.0 and 7.5 VOUT Options   Cout (uF) Ccomp (nF) 0.1 1 1 1 10 10   Suitable ...

    Jul 23, 2025
  2. Is it possible to use the ISL21090 without a compensation capacitor?

    It is possible to use these voltage references without a compensation capacitor if the output capacitance is under 100pF for ISL21090B12 (1.25 VOUT version). For the other versions (2.5V, 5.0V and 7.5V) the output capacitance must be either under 100pF or between 50nF to 100nF. However ...

    Jul 23, 2025
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