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ISL21090B25

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Ultra-Low Noise, Precision Voltage Reference with 2.5 VOUT

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Overview

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.

ISL21090Bxx Functional Diagram
ISL21090Bxx Functional Diagram
  • 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

Documentation

Design & Development

Software Downloads
Type Title Date
PCB Design Files
ISL21090xxEV1ZBOM Design Files
ZIP 140 KB
1 item

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FAQs

  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