1.2 V Ultralow Power High PSRR Voltage Reference
ADR280
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
APPLICATIONS
♦List GSM, GPRS, 3G mobile stations
♦Portable battery-operated electronics
♦Low voltage converter references
♦Wireless devices
GENERAL 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 references
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 industrial temperature
range of −40°C to +85°C.
TYPICAL PERFORMANCE CHARACTERISTICS
