ADR121AUJZ [ADI]

IC 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO6, LEAD FREE, MO-193AA, TSOT-23, 6 PIN, Voltage Reference;


型号：	ADR121AUJZ
厂家：	ADI
描述：	IC 1-OUTPUT THREE TERM VOLTAGE REFERENCE, 2.5 V, PDSO6, LEAD FREE, MO-193AA, TSOT-23, 6 PIN, Voltage Reference 光电二极管输出元件
文件：	总8页 (文件大小：147K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Precision, Micropower LDO

Preliminary Technical Data

Voltage References in TSOT-23

ADR121/ADR125/ADR127

FEATURES

Initial Accuracy:

A-Grade: +0.24%

PIN CONFIGURATION

B-Grade: +0.12%

Max. Tempco.

6-Lead TSOT-23

(UJ Suffix)

A-Grade: 25ppm/^oC

B-Grade: 9ppm/^oC

Low Dropout: 300mV

High Output Current: +5mA/-2mA

Low Operating Current: 85μA

Input Range: 2.7V to 18V

Temperature Range: -40^oC to +125 ^oC

Tiny TSOT-23-6 Package

NC*

GND 2

VIN

NC*

5 NC*

VOUT

*Must be left floating

APPLICATIONS

Battery-Powered Instrumentation

Portable Medical Equipment

Data Acquisition Systems

Automotive

GENERAL DESCRIPTION

The ADR12x is a low-dropout voltage reference,

requiring only 300mV above the nominal output

voltage on the input to provide a stable output

voltage. This low dropout performance coupled

with the low 85uA operating current makes the

ADR12x ideal for battery-powered applications.

Available in industrial temperature range of –40^oC

to +125^oC, the ADR12x is housed in the tiny

TSOT-23-6 package.

The ADR12x is a family of micropower high

precision, series mode bandgap reference with sink

and source capability. It features high accuracy,

and low-power consumption in a tiny package. The

ADR12x design includes a patented temperature

drift curvature correction techniques minimizes the

non-linearities in the output voltage vs. temperature

characteristics.

ORDERING GUIDE

Initial Max.

Accuracy Tempco

+3mV

+1.5mV

+6mV

+3mV

+12mV

+6mV

Model

Vout

1.25V

2.5V

5.0V

Package

ADR127AUJZ

ADR127BUJZ

ADR121AUJZ

ADR121BUJZ

ADR125AUJZ

ADR125BUJZ

25ppm/^oC

9ppm/^oC

25ppm/^oC

9ppm/^oC

25ppm/^oC

9ppm/^oC

TSOT-23-6 (lead-free)

REV. PrA

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 and

registered trademarks are the property of their respective companies.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

www.analog.com

Last Edited: August 31, 2005

Preliminary Technical Data

ADR121/ADR125/ADR127

ADR127 ELECTRICAL CHARACTERISTICS (@ T_A= 25^oC, 2.7V to 18V, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITION

Min

Typ

Max

UNITS

Output Voltage

B-Grade

V_O

@ 25^oC

1.2485

1.2470

1.25

1.2515

A-Grade

1.25 1.2530

Initial Accuracy Error

B-Grade

A-Grade

Temperature Coefficient

B-Grade

@ 25^oC

V_OERR

TCV_O

-0.12

-0.24

+0.12

+0.24

-40^oC < T_A< +125^oC

ppm/ ^oC

A-Grade

Load Regulation

-40^oC < T_A< +125^oC; V_IN= 3.0V

0.5

mV/mA

0mA < I_OUT< 5mA

40^oC < T_A< +125^oC; V_IN= 3.0V

-2mA < I_OUT< 0mA

2.7V to 18V

Line Regulation

I_OUT= 0mA

ppm/V

Ripple Rejection

Quiescent Current

f= 60Hz

∆V_OUT

∆V_IN

I_Q

-40^oC < T_A< +125^oC, No Load

V_IN= 18V

125

µA

V_IN= 2.7V

Short Circuit Current to

Ground

Noise Voltage

V_IN= 5.0V

@ 25^oC

0.1Hz to 10Hz

µVp-p

Turn-on Settling Time

Long-Term Stability

Output Voltage Hysteresis

200

TBD

To 0.1%, C_L= 0.2 µF

µs

ppm/1000 hrs.

ppm

1,000 Hours @ 25^oC

Last Edited: August 31, 2005

Rev. PrA | Page 2 of 8

Preliminary Technical Data

ADR121/ADR125/ADR127

ADR121 ELECTRICAL CHARACTERISTICS (@ T_A= 25^oC, V_IN= 2.8V to 18V, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITION

Min

Typ

Max

UNITS

Output Voltage

B-Grade

V_O

@ 25^oC

2.497

2.494

2.5

2.503

2.506

A-Grade

Initial Accuracy Error

B-Grade

A-Grade

Temperature Coefficient

B-Grade

V_OERR

TCV_O

V_DO

@ 25^oC

-0.12

-0.24

+0.12

+0.24

-40^oC < T_A< +125^oC

ppm/ ^oC

A-Grade

Dropout (V_IN– V_OUT

Load Regulation

)

I_OUT= 5mA

300

-40^oC < T_A< +125^oC; V_IN= 3.0V

0mA < I_OUT< 5mA

0.5

mV/mA

-40^oC < T_A< +125^oC; V_IN= 3.0V

-2mA < I_OUT< 0mA

2.8V < V_IN< 18V

Line Regulation

I_OUT= 0mA

ppm/V

Ripple Rejection

Quiescent Current

f= 60Hz

∆V_OUT

∆V_IN

I_Q

-40^oC < T_A< +125^oC, No Load

V_IN= 18V

125

µA

V_IN= 3.0V

Short Circuit Current to

Ground

Noise Voltage

@ 25^oC

0.1Hz to 10Hz

µVp-p

Turn-on Settling Time

Long-Term Stability

Output Voltage Hysteresis

200

TBD

To 0.1%, C_L= 0.2 µF

µs

ppm/1000 hrs.

ppm

1,000 Hours @ 25^oC

Last Edited: August 31, 2005

Rev. PrA | Page 3 of 8

Preliminary Technical Data

ADR121/ADR125/ADR127

ADR125 ELECTRICAL CHARACTERISTICS (@ T_A= 25^oC, V_IN= 5.3V to 18V, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITION

Min

Typ

Max

UNITS

Output Voltage

B-Grade

V_O

@ 25^oC

4.994

4.988

5.0

5.006

5.012

A-Grade

Initial Accuracy Error

B-Grade

A-Grade

Temperature Coefficient

B-Grade

V_OERR

TCV_O

V_DO

@ 25^oC

-0.12

-0.24

+0.12

+0.24

-40^oC < T_A< +125^oC

ppm/ ^oC

A-Grade

Dropout (V_IN– V_OUT

Load Regulation

)

I_OUT= 5mA

300

-40^oC < T_A< +125^oC; V_IN= 5.5V

0mA < I_OUT< 5mA

0.5

mV/mA

-40^oC < T_A< +125^oC; V_IN= 5.5V

-2mA < I_OUT< 0mA

5.3V < V_IN< 18V

Line Regulation

I_OUT= 0mA

ppm/V

Ripple Rejection

Quiescent Current

f = 60Hz

∆V_OUT

∆V_IN

I_Q

-40^oC < T_A< +125^oC, No Load

V_IN= 18V

125

µA

V_IN= 5.3V

Short Circuit Current to

Ground

Noise Voltage

@ 25^oC

0.1Hz to 10Hz

µVp-p

Turn-on Settling Time

Long-Term Stability

Output Voltage Hysteresis

200

TBD

To 0.1%, C_L= 0.2 µF

µs

ppm/1000 hrs.

ppm

1,000 Hours @ 25^oC

ABSOLUTE MAXIMUM RATINGS¹

_INto GND............................................................................20V

Internal Power Dissipation²

SOT-23 (RT) ................................................................ 400mW

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

Specified Temperature Range........................... –40°C to +120°C

Lead Temperature, Soldering

Vapor Phase (60 sec) ....................................................... +215°C

Infrared (15 secs)............................................................. +220°C

Last Edited: August 31, 2005

Rev. PrA | Page 4 of 8

Preliminary Technical Data

ADR121/ADR125/ADR127

The change of output voltage after the device is

cycled through temperature from +25^oC C to -40^oC

to +125^oC and back to +25^oC. This is a typical value

from a sample of parts put through such a cycle.

TERMINILOGY

Temperature Coefficient

The change of output voltage with respect to

operating temperature change normalized by the

output voltage at 25^oC. This parameter is expressed

in ppm/^oC and can be determined by

V_{O _ HYS}= V_O(25^oC) −V_{O _ TC}

V_O(25^oC) −V_{O _ TC}

V_o(T₂) −V_o(T₁)

V_{O _ HYS}[ ppm] =

×10⁶

TCV_O[ ppm /^oC] =

×10⁶

V_O(25^oC)

V_o(25^oC)× (T₂−T₁)

where:

V_o(25^oC) = V_oat 25^oC.

where;

V_o(25^oC) = V_oat 25^oC.

_{o_TC}= V_oat 25^oC after temperature cycle at +25^oC

to -40^oC to +125^oC and back to +25^oC.

V_o(T₁) = V_oat Temperature 1.

V_o(T₂) = V_oat Temperature 2.

NOTES

Input Capacitor

Line Regulation

Input capacitors are not required on the ADR12x.

There is no limit for the value fo the capacitor used

on trhe input, but a 1µF to 10µF capacitor on the

input improved transient response in the applications

where there is a sudden supply change. An

additional 0.1µF capacitor in parallel also helps

reduce noise from the supply.

The change in the output due to a specified change

in input voltage. This parameter accounts for the

effects of self-heating. Line regulation is expressed

in either percent per volt, parts-per-million per volt,

or microvolts per voltage changes in input voltage.

Load Regulation

The change in output voltage due to a specified

change in load current. This parameter accounts for

the effects of self-heating. Load regulation is

expressed in either microvolts per milliampere,

parts-per-million per milliampere, or ohms of dc

output resistance.

Output Capacitor

The ADR12x requires a small 0.1µF for stability.

Additional 0.1µF to 10µF capacitance in parallel can

improve load transient response. This acts as a

source of stored energy for a sudden increase in

load current. The only parameter affected with the

additional capacitance is turn-on time.

Long-Term Stability

Typical shift of output voltage at 25^oC on a sample of

parts subjected to a test of 1,000 hours at 25^oC.

∆V_o= V_o(t_o) −V_o(t₁)

V_o(t_o) −V_o(t₁)

∆V_o[ppm] =

×10⁶

V_o(t_o)

where:

V_o(t₀) = V_oat 25^oC at Time 0.

V_o(t₁) = V_oat 25^oC after 1,000 hours operating at

25^oC.

Thermal Hysteresis

TYPICAL PERFORMANCE CHARACTERISTICS

Last Edited: August 31, 2005

Rev. PrA | Page 5 of 8

Preliminary Technical Data

ADR121/ADR125/ADR127

T_J−T_A

P_D=

THEORY OF OPERATION

Θ_JA

The ADR12x band gap references are the high

performance solution for low supply voltage and low

power applications. This family of precision

references uses the underlying temperature

characteristics of a silicon transistor’s base emitter

voltage in the forward-biased operating region.

Under this condition, all such transisitors have a -

2mV/^oC temperature coeffient (TC) and a V_BEthat,

when exptrapolated to absolute zero, 0^oK (with

collector current proportional to absolute

In this equation, T_Jand T_Aare respectively, the

junction and the ambient temperatures, P_Dis the

device power dissipation, and Θ_JAis the device

package thermal resistance.

APPLICATIONS

Basic Voltage Reference Connection

temperature), approximates the silicon band gap

voltage by summing a voltage that has equal and

opposite temperature coefficient of 2mV/^oC with the

V_BEof a forward-biased transistor, an almost zero

TC reference can be developed. In the ADR12x

simplified circuit diagram shown in Figure xx, such a

compensating voltage, V_R4, is derived by driving two

transistors at different current densities and

The circuit in Figure a illustrustates the basic

confirguration for the ADR12x family voltage

reference.

amplying the resultant V_R3or V_BE(∆VΒΕ, which has

a positive TC). The sum of V_BEand V_R4is then

buffered and amplified to produce stable reference

voltage outputs of 1.25V, 2.5V, and 5.0V.

V_IN

V_OUT

Figure xx. Basic Configuration for the ADR12x

Familiy

R₂

R₁

R_F

Stacking Reference ICs for Arbitrary Outputs

R_B

Some applications may require two reference

votlage sources, which are a combined sum of the

standard outputs. Figure xx shows how this stacked

output reference can be implemented.

R₃

R₆

R₄

Devices Power Dissipation Considerations

The ADR12x family is capable of delivering load

currents to 5mA with and input range from 3.0V to

18V. When this device is used in applications with

large input voltages, care should be take to avoid

exceeding the specified maximum power dissipation

or junction temperature because it could result in

premature device failure. Use the following formula

to calculate a device’s maximum junction

temperature or dissipation:

Figure xx. Stacking References with ADR12x

Last Edited: August 31, 2005

Rev. PrA | Page 6 of 8

Preliminary Technical Data

ADR121/ADR125/ADR127

operate on low supply voltages. The ADR12x can

Two reference ICs are used, and fed from an

unregulated input, V_IN. The outputs of the individual

ICs are connected in series, which provides tow

output voltages, V_OUT1and V_OUT2. V_OUT1is the

configured as a precision current source (see Figure

xx). The circuit configuration illustrated is a floating

current source with a grounded load. The

reference’s output voltage is bootstrapped acrossed

R_SET, which sets the output current into the load.

With this configuration, circuit precision is

maintained

terminal voltage of U1, while V_OUT2is the sum of this

voltage and the terminal of U2. U1 and U2 are

chosen for the two votlages that supply the required

outputs (see Table xx). For example, if U1 and U2

are ADR127, V_OUT1is 1.25V and V_OUT2is 2.5V.

for load currents ranging form the reference’s supply

Table xx Output

current, typically 95µA, to approximately 5mA.

U1/U2

V_OUT1

1.25V

2.5V

V_OUT2

3.75V

6.25V

7.5V

ADR127/ADR121

ADR127/ADR125

ADR121/ADR125

A Negative Precision Reference Without

Precision Resistors

A negative reference I easily generated by adding

an op amp, A1, and is configured in Figure xx. V_OUT1

is at virtual ground and, therefore, the negative

reference can be taken directly form the output of

the op amp. The op amp must be dual-supply, low

offset, and rail-to-rail if the negative supply voltage is

close to the reference output.

Figure xx. Negative Reference

General Purpose Current Source

Many times in low power applications, the need

arises for a precision current source that can

Last Edited: August 31, 2005

Rev. PrA | Page 7 of 8

Preliminary Technical Data

ADR121/ADR125/ADR127

OUTLINE DIMENSIONS

ORDERING GUIDE

Temperature

Coefficient

(ppm/^oC)

Output

Voltage

(V_O)

Temperature

Range (^oC)

Package

Description

Package

Option

Models*

Initial Accuracy

Branding

ADR127AUJZ-REEL7

ADR127BUJZ-REEL7

ADR121AUJZ-REEL7

ADR121BUJZ-REEL7

ADR125AUJZ-REEL7

ADR125BUJZ-REEL7

*3,000 pieces per reel

1.25V

2.5V

5.0V

3mV

1.5mV

6mV

3mV

12mV

6mV

0.24%

0.12%

0.24%

0.12%

0.24%

0.12%

TSOT

UJ-6

-40 to +125 R0S

-40 to +125 R0T

-40 to +125 R0N

-40 to +125 R0P

-40 to +125 R0Q

-40 to +125 R0R

5.0V

Last Edited: August 31, 2005

Rev. PrA | Page 8 of 8

ADR121AUJZ [ADI]

相关型号：

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ADR121AUJZREEL7

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