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ADR280

1.2 V Ultralow Power

High PSRR Voltage Reference

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 A 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

GSM, GPRS, 3G Mobile Stations

Portable Battery-Operated Electronics

Low Voltage Converter References

Wireless Devices

PIN CONFIGURATIONS

3-Lead SOT-23

(RT Suffix)

V+ 1

2

3

ADR280

V–

3-Lead SC70

(KS Suffix)

V+

2

3

ADR280

V–

TEMPERATURE (C)

15

–15

–40

100

–20

0

20

40

60

80

–10

–5

0

5

10

3V TO 5V

Figure 1. Line Regulation vs.Temperature

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, which

has an analog baseband IC with on-board baseband and audio

codecs, voltage regulators, and battery charger, rely on the

ADR280’s ability 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 2.4V

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.

REV. A