Analog Devices ADR280 b Datasheet

1.2 V Ultralow Power

V

OUT

V

IN

1

2

3

ADR280

GND

V

IN

V

OUT

1

2

3

ADR280

GND

TEMPERATURE (C)

15

–15

–40 100–20

LINE REGULATION (ppm/V)

0 20 40 60 80

–10

–5

0

5

10

3V TO 5V

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 A Maximum
Temperature Coefcient, 40 ppm/oC 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

GENERAL DESCRIPTION

The ADR280 is a 1.2 V band gap core reference with excellent
line regulation and power supply rejection designed specically
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 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
amplier 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 specic outputs, which simplies the
user’s design, but compromises on the cost, form factor, and
exibility. 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 specied over the extended indus-

trial temperature range of –40°C to +85°C.

PIN CONFIGURATIONS

3-Lead SOT-23

(RT Sufx)

3-Lead SC70

(KS Sufx)

Figure 1. Line Regulation vs. Temperature

REV. B

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties
that may result from its use. No license is granted by implication or oth­erwise under any patent or patent rights of Analog Devices. Trademarks
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Tel: [phone] www.analog.com
Fax: [phone] © 2004 Analog Devices, Inc. All rights reserved.

ADR280–SPECIFICATIONS

V

OUT

V

IN

1

2

3

ADR280

GND

V

IN

V

OUT

1

2

3

ADR280

GND

ELECTRICAL CHARACTERISTICS

(VIN = 2.55 V to 5.5 V, TA = 25°C, unless otherwise noted.)

Parameter Symbol Conditions Min Typ1 Max Unit

Output Voltage2 V

1.195 1.200 1.205 V

OUT

Temperature Coefcient TCVo 0°C < TA < 50°C 5 20 ppm/oC
–40°C < TA < +85°C 10 40 ppm/oC

Line Regulation V

/VIN 2.55 V < VIN < 5.5 V, No Load 2 12 ppm/V

OUT

Supply Current IIN 2.4 V < VIN < 5.5 V, No Load 10 16 µA
Ground Current I

V– Grounded, I

GND

= 10 µA 12 20 µA

LOAD

Input Voltage Range VIN 2.4 5.5 V
Operating Temperature Range T
Nominal Load Capacitance C

A

1 µF

OUT

–40 +85 °C

Output Noise Voltage VN f = 10 Hz to 10 kHz 12.5 µVrms
Output Noise Density eN f = 400 kHz 12.5 nV/÷Hz
Power Supply Ripple Rejection3 PSRR I

= 10 µA –80 dB

LOAD

Start-Up Time tON 2 ms

NOTES

1

Typical values represent average readings taken at room temperature.

2

Conditions: 2.4 V < VIN < 5.5 V, 0 µA < I

3

Power supply ripple rejection measurement applies to a changing input voltage (VIN) waveform with a nominal 3.6 V baseline that drops to a 3 V value for
380 µs at a 4.6 ms repetition rate.

Specications subject to change without notice.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V

Storage Temperature Range . . . . . . . . . . . . . . –65°C to +150°C

Operating Temperature Range . . . . . . . . . . . . . –40°C to +85°C

Junction Temperature Range . . . . . . . . . . . . . . –65°C to +150°C

Lead Temperature Range (Soldering, 60 Sec) . . . . . . . . . .300°C

NOTES

1

Stresses above those listed under Absolute Maximum Ratings may cause permanent
damage to the device. This is a stress rating only and functional operation of the
device at these or any other conditions above those listed in the operational sections

< 10 µA, –40°C < TA < +85°C.

OUT

1, 2

of this specication is not implied. Exposure to absolute maximum rating conditions
for extended periods may affect device reliability.

2

Absolute Maximum Ratings apply at 25°C, unless otherwise noted.

THERMAL RESISTANCE

Package Type JA* 

JC

Unit

SOT-23 230 146 °C/W
SC70 376 102 °C/W

* JA is specied for the worst-case conditions, i.e., JA is specied for device sol-

dered in circuit board for surface-mount packages.

ORDERING GUIDE

Temperature Package Package Top Output Number of
Model Range Description Option Mark Voltage (V) Parts per Reel

ADR280ART-R2 –40°C to +85°C SOT-23 RT-3 RBA 1.200 250
ADR280ART-REEL7 –40°C to +85°C SOT-23 RT-3 RBA 1.200 3,000
ADR280ART-REEL –40°C to +85°C SOT-23 RT-3 RBA 1.200 10,000
ADR280ARTZ-REEL7* –40°C to +85°C SOT-23 RT-3 RBA 1.200 3,000
ADR280AKS-R2 –40°C to +85°C SC70 KS-3 RBA 1.200 250
ADR280AKS-REEL7 –40°C to +85°C SC70 KS-3 RBA 1.200 3,000
ADR280AKS-REEL –40°C to +85°C SC70 KS-3 RBA 1.200 10,000

*Z = Pb-free part.

PIN FUNCTION DESCRIPTIONS

Mnemonic

PIN CONFIGURATIONS

SOT-23

SC70

Pin No. SOT-23 SC70 Description

1 V+ V

2 V

OUT

High Supply Voltage Input

OUT

V+ Output Voltage

3 V– V– Low Supply Voltage Input

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate
on the human body and test equipment and can discharge without detection. Although the ADR280
features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high
energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.

–2–

REV. B REV. B

Typical Performance Characteristics–ADR280

TEMPERATURE (C)

1.20225

–40 100–20

V

OUT

(V)

0 20 40 60 80

NO LOAD

1.20200

1.20175

1.20150

1.20125

1.20100

1.20075

1.20050

1.20025

1.20000

TEMPERATURE (C)

–40 100–20

I

IN

(A)

0 20 40 60 80

VIN = 5V

15

14

13

12

11

10

9

VIN = 3V

TEMPERATURE (C)

15

–15

–40 100–20

LINE REGULATION (ppm/V)

0 20 40 60 80

–10

–5

0

5

10

3V TO 5V

Ch1 50.0V M 1.00 s

1

–100

–80

–60

–40

NOISE POWER DENSITY (dBm)

10.07.55.02.50

FREQUENCY (kHz)

10dB/DIV

–40dB

0Hz 100kHz

TPC 1. V

vs. Temperature

OUT

TPC 2. Supply Current vs. Temperature

TPC 4. Noise Voltage Peak-to-Peak 10 Hz to 10 kHz

TPC 5. Output Noise Density Plot
(VIN = 3.6 V, C

= 1 µF, CIN = 1 µF)

OUT

TPC 3. Line Regulation vs. Temperature

TPC 6. Voltage Noise Density 0 Hz to 100 kHz

–3–