ADR280:  1.2 V Ultralow Power High PSRR Voltage Reference

The ADR280 is a 1.2 V band gap core reference with excellent line regulation and power supply rejection designed specifically for applications experiencing heavy dynamic supply variations, such as ...More

Essential companion part for AD6535 for handset applications. It also can be used as a general purpose part where low noise and low power reference is needed. Its tiny SC70 package makes it ideal for hand held devices applications.

ADR280:  1.2 V Ultralow Power High PSRR Voltage Reference

Product Description

The ADR280 is a 1.2 V band gap core reference with excellent line regulation and power supply rejection designed specifically for applications experiencing heavy dynamic supply variations, such as data converter references in GSM, GPRS, and 3G mobile station applications. Devices such as the AD6535 that have an analog baseband IC with on-board baseband, audio codecs, voltage regulators, and battery chargers rely on the ability of the ADR280 to reject input battery voltage variations during RF power amplifier activity.

In addition to mobile stations, the ADR280 is suitable for a variety of general-purpose applications. Most band gap refer-ences include internal gain for specific outputs, which simplifies the user’s design, but compromises on the cost, form factor, and flexibility. The ADR280, on the other hand, optimizes the band gap core voltage and allows users to tailor the voltage, current, or transient response by simply adding their preferred op amps.

The ADR280 operates on a wide supply voltage range from 2.4 V to 5.5 V. It is available in compact 3-lead SOT-23 and SC70 packages. The device is specified over the extended indus-trial temperature range of −40°C to +85°C.

Applications

  • List GSM, GPRS, 3G mobile stations
  • Portable battery-operated electronics
  • Low voltage converter references
  • Wireless devices

    • Data Sheet, Rev. C, 4/07

    Features

    • 1.2 V precision output
    • Excellent line regulation: 2 ppm/V typical
    • High power supply ripple rejection: –80 dB at 220 Hz
    • Ultralow power supply current: 16 μA maximum
    • Temperature coefficient: 40 ppm/°C maximum
    • Low noise, 12.5 nV/√Hz typical
    • Operating supply range, 2.4 V to 5.5 V
    • Compact 3-lead SOT-23 and SC70 packages

    Verified Circuits Using This Part

    Verified Circuits are designed for ease of use and proven to work by ADI applications engineers. To learn more about Verified Circuits from ADI, please visit Verified Circuits Home.

    Circuit Diagram

    Diagrams

    ADR280 Diagram
    Pin Configuration Diagram for ADR280

    Specifications

    Vout 1.2
    Initial Accuracy (%) 0.4
    Ref Out TC (ppm/C) 5ppm/C
    Supply Voltage Range (V) +2.4 to +5.5
    Supply Current (max) 16µA
    Ref Output Current (mA) 100µA
    0.1-10 Hz Noise (µV p-p) 2.2µV p-p
    Temp Range(s) -40 to +85
    Package SC70,SOT23
    Reference Type Series

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