1.2 V Ultralow Power
High PSRR Voltage Reference
ADR280
Rev. C
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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 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.
PIN CONFIGURATIONS
V+
1
OUT
2
V–
3
ADR280
03065-001
Figure 1. 3-Lead SOT-23
(RT Suffix)
OUT
1
V+
2
V–
3
ADR280
03065-002
Figure 2. 3-Lead SC70
(KS Suffix)
15
–15
–10
–5
0
5
10
3V TO 5V
LINE REGULATION (ppm/V)
TEMPERATURE (°C)
–40 –20 0 20 40 60 80 100
03065-003
Figure 3. Line Regulation vs. Temperature
