REF3125AIDBZRG4中文资料应用文章市场行情现货热卖使用介绍-中国IC网-芯三七

REF3112

REF3120

REF3125

REF3130

REF3133

REF3140

SBVS046C – DECEMBER 2003 – REVISED FEBRUARY 2006

15ppm/°C Max, 100µA, SOT23-3

SERIES VOLTAGE REFERENCE

FEATURES

DESCRIPTION

The REF31xx is a family of precision, low power, low dropout,

series voltage references available in the tiny SOT23-3 pack-

age.

● MicroSIZE PACKAGE: SOT23-3

● LOW DROPOUT: 5mV

● HIGH OUTPUT CURRENT: ±10mA

● HIGH ACCURACY: 0.2% max

● LOW I_Q: 115µA max

The REF31xx’s small size and low power consumption

(100µA typ) make it ideal for portable and battery-powered

applications. The REF31xx does not require a load capacitor,

but is stable with any capacitive load and can sink/source up

to 10mA of output current.

●

EXCELLENT SPECIFIED DRIFT PERFORMANCE:

15ppm/°C (max) from 0°C to +70°C

20ppm/°C (max) from –40°C to +125°C

Unloaded, the REF31xx can be operated on supplies down

to 5mV above the output voltage. All models are specified for

the wide temperature range of –40°C to +125°C.

APPLICATIONS

● PORTABLE, BATTERY-POWERED EQUIPMENT

● DATA ACQUISITION SYSTEMS

● MEDICAL EQUIPMENT

PRODUCT

REF3112

REF3120

REF3125

REF3130

REF3133

REF3140

VOLTAGE (V)

1.25

2.048

2.5

3.0

● HAND-HELD TEST EQUIPMENT

3.3

4.096

REF3112

REF3120

REF3125

REF3130

REF3133

REF3140

IN

1

2

3

GND

OUT

SOT23-3

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

www.ti.com

ABSOLUTE MAXIMUM RATINGS⁽¹⁾

ELECTROSTATIC

DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas Instru-

ments recommends that all integrated circuits be handled with

appropriate precautions. Failure to observe proper handling

and installation procedures can cause damage.

Supply Voltage, V+ to V–................................................................... 7.0V

Output Short-Circuit ................................................................. Continuous

Operating Temperature ..................................................–55°C to +135°C

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

Junction Temperature .................................................................... +150°C

NOTES: (1) Stresses above these ratings may cause permanent damage.

Exposure to absolute maximum conditions for extended periods may degrade

device reliability. These are stress ratings only, and functional operation of the

device at these, or any other conditions beyond those specified, is not implied.

ESD damage can range from subtle performance degradation

to complete device failure. Precision integrated circuits may be

more susceptible to damage because very small parametric

changes could cause the device not to meet its published

specifications.

PACKAGE/ORDERING INFORMATION⁽¹⁾

SPECIFIED

PACKAGE

DESIGNATOR

TEMPERATURE

RANGE

PACKAGE

MARKING

ORDERING

NUMBER

TRANSPORT

MEDIA, QUANTITY

PRODUCT

PACKAGE-LEAD

REF3112

SOT23-3

DBZ

"

–40°C to +125°C

R31A

"

REF3112AIDBZT

REF3112AIDBZR

Tape and Reel, 250

Tape and Reel, 3000

"

REF3120

SOT23-3

DBZ

–40°C to +125°C

R31B

REF3120AIDBZT

REF3120AIDBZR

Tape and Reel, 250

Tape and Reel, 3000

"

R31C

"

REF3125

SOT23-3

DBZ

"

–40°C to +125°C

REF3125AIDBZT

REF3125AIDBZR

Tape and Reel, 250

Tape and Reel, 3000

"

REF3130

SOT23-3

DBZ

–40°C to +125°C

R31E

REF3130AIDBZT

REF3130AIDBZR

Tape and Reel, 250

Tape and Reel, 3000

"

REF3133

"

SOT23-3

DBZ

"

–40°C to +125°C

R31F

"

REF3133AIDBZT

REF3133AIDBZR

Tape and Reel, 250

Tape and Reel, 3000

"

REF3140

SOT23-3

DBZ

"

–40°C to +125°C

R31D

"

REF3140AIDBZT

REF3140AIDBZR

Tape and Reel, 250

Tape and Reel, 3000

"

NOTE: (1) (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI website at

www.ti.com.

ELECTRICAL CHARACTERISTICS

Boldface limits apply over the specified temperature range, T_A= –40°C to +125°C.

At T_A= +25°C, I_LOAD= 0mA, V_IN= 5V, unless otherwise noted.

REF31xx

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

REF3112⁽¹⁾- 1.25V

OUTPUT VOLTAGE

Initial Accuracy

V_OUT

1.2475

–0.2

1.25

1.2525

0.2

V

%

NOISE

Output Voltage Noise

Voltage Noise

f = 0.1Hz to 10Hz

f = 10Hz to 10kHz

17

24

µV_PP

µVrms

REF3120 – 2.048

OUTPUT VOLTAGE

Initial Accuracy

2.0439

–0.2

2.048

2.0521

0.2

V

%

NOISE

Output Voltage Noise

Voltage Noise

f = 0.1Hz to 10Hz

f = 10Hz to 10kHz

27

39

µV_PP

µVrms

REF3125 – 2.5V

OUTPUT VOLTAGE

Initial Accuracy

2.4950

–0.2

2.50

2.5050

0.2

V

%

NOISE

Output Voltage Noise

Voltage Noise

f = 0.1Hz to 10Hz

f = 10Hz to 10kHz

33

48

µV_PP

µVrms

REF3112, 3120, 3125, 3130, 3133, 3140

2

SBVS046C

www.ti.com

ELECTRICAL CHARACTERISTICS

Boldface limits apply over the specified temperature range, T_A= –40°C to +125°C.

At T_A= +25°C, I_LOAD= 0mA, V_IN= +5V, unless otherwise noted.

REF31xx

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

REF3130 – 3.0V

OUTPUT VOLTAGE

Initial Accuracy

V_OUT

2.9940

–0.2

3.0

3.0060

0.2

V

%

NOISE

Output Voltage Noise

Voltage Noise

f = 0.1Hz to 10Hz

f = 10Hz to 10kHz

39

57

µV_PP

µVrms

REF3133 – 3.3V

OUTPUT VOLTAGE

Initial Accuracy

3.2934

–0.2

3.30

3.3066

0.2

V

%

NOISE

Output Voltage Noise

Voltage Noise

f = 0.1Hz to 10Hz

f = 10Hz to 10kHz

43

63

µV_PP

µVrms

REF3140 – 4.096V

OUTPUT VOLTAGE

Initial Accuracy

4.0878

–0.2

4.096

4.1042

0.2

V

%

NOISE

Output Voltage Noise

Voltage Noise

f = 0.1Hz to 10Hz

f = 10Hz to 10kHz

53

78

µV_PP

µVrms

REF3112, REF3120, REF3125, REF3130, REF3133, REF3140

OUTPUT VOLTAGE TEMP DRIFT⁽²⁾

dV_OUT/dT

0°C ≤ T_A≤ +70°C

–40°C ≤ T_A≤ +125°C

5

10

15

20

ppm/°C

LONG-TERM STABILITY

LINE REGULATION

0-1000h

V_REF+ 0.05⁽¹⁾≤ V_IN≤ 5.5V

70

20

ppm

65

ppm/V

LOAD REGULATION⁽³⁾

dV_OUT/dI_LOAD

Sourcing

0mA < I_LOAD< 10mA,

V_IN= V_REF+ 250mV⁽¹⁾

–10mA < I_LOAD< 0mA,

V_IN= V_REF+ 100mV⁽¹⁾

10

20

30

50

µV/mA

Sinking

THERMAL HYSTERESIS⁽⁴⁾

First Cycle

Additional Cycles

dT

100

25

ppm

DROPOUT VOLTAGE⁽¹⁾

OUTPUT CURRENT

V_IN– V_OUT

5

50

mV

I_LOAD

I_SC

–10

10

mA

SHORT-CIRCUIT CURRENT

Sourcing

Sinking

50

40

mA

TURN-ON SETTLING TIME

to 0.1% at V_IN= +5V with C_L= 0

I_L= 0

400

µs

POWER SUPPLY

Voltage

Quiescent Current

Over Temperature

V_S

I_Q

V_REF+ 0.05⁽¹⁾

5.5

115

135

V

µA

100

115

TEMPERATURE RANGE

Specified Range

Operating Range

–40

–55

–65

+125

+135

+150

°C

Storage Range

Thermal Resistance

SOT23-3 Surface-Mount

θ_JA

336

°C/W

NOTES: (1) Minimum supply voltage for REF3112 is 1.8V.

(2) Box Method used to determine temperature drift.

(3) Typical value of load regulation reflects measurements using force and sense contacts; see the Load Regulation section.

(4) Thermal hysteresis is explained in more detail in the Applications Information section of this data sheet.

(5) For I_L> 0, see the Typical Characteristic curves.

REF3112, 3120, 3125, 3130, 3133, 3140

3

SBVS046C

www.ti.com

TYPICAL CHARACTERISTICS

At T_A= +25°C, V_IN= +5V power supply, REF3125 is used for typical characteristics, unless otherwise noted.

TEMPERATURE DRIFT (0°C to +70°C)

TEMPERATURE DRIFT (–40°C to +125°C)

18

16

14

12

10

8

25

20

15

10

5

6

4

2

0

1

2

3

4

5

6

8

9

10 11 12 13 14 15 16

0

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Drift (ppm/°C)

DROPOUT VOLTAGE vs LOAD CURRENT

OUTPUT VOLTAGE vs TEMPERATURE

120

100

80

60

40

20

0

0.16

0.14

0.12

0.10

0.08

0.06

0.04

0.02

0

−0.02

−0.04

–15

–10

–5

0

5

10

15

−60 −40 −20

0

20

40

60

80 100 120 140

Load Current (mA)

Temperature (°C)

QUIESCENT CURRENT vs TEMPERATURE

OUTPUT IMPEDANCE vs FREQUENCY

120

100

80

60

40

20

0

100

10

1

0.1

0.01

–60 –40 –20

0

20

40

60

80 100 120 140

1

10

100

1k

10k

100k

1M

Temperature (°C)

Frequency (Hz)

REF3112, 3120, 3125, 3130, 3133, 3140

4

SBVS046C

www.ti.com

TYPICAL CHARACTERISTICS (Cont.)

At T_A= +25°C, V_IN= +5V power supply, REF3125 is used for typical characteristics, unless otherwise noted.

PSRR vs FREQUENCY

OUTPUT vs SUPPLY

90

80

70

60

50

40

30

20

10

0

2.505

2.504

2.503

2.502

2.501

2.500

2.499

2.498

+125°C

+25°C

−40°C

1

10

100

1k

10k

100k

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0 6.5

Frequency (Hz)

Supply (V)

STEP RESPONSE, C_L= 0, 5V STARTUP

OUTPUT VOLTAGE vs LOAD CURRENT

2.505

2.504

2.503

2.502

2.501

2.500

2.499

2.498

2.497

+125°C

V_IN

+25°C

−40°C

V_OUT

–15

–10

–5

0

5

10

15

100µs/div

Load Current (mA)

REF3112 LONG TERM STABILITY

0.1Hz TO 10Hz NOISE

20

0

–20

–40

–60

–80

–100

–120

400ms/div

0

100 200 300 400 500 600 700 800 900 1000

Time (Hrs)

REF3112, 3120, 3125, 3130, 3133, 3140

5

SBVS046C

www.ti.com

TYPICAL CHARACTERISTICS (Cont.)

At T_A= +25°C, V_IN= +5V power supply, REF3125 is used for typical characteristics, unless otherwise noted.

LINE TRANSIENT

C_L= 0pF

LINE TRANSIENT

C_L= 10µF

V_IN

V_OUT

20µs/div

100µs/div

LOAD TRANSIENT

C_L= 0pF, ±10mA OUTPUT PULSE

C_L= 1µF, ±10mA OUTPUT PULSE

I_LOAD

+10mA

–10mA

V_OUT

40µs/div

LOAD TRANSIENT

C_L= 0pF, ±1mA OUTPUT PULSE

C_L= 1µF, ±1mA OUTPUT PULSE

V_IN

+1mA

V_IN

+1mA

–1mA

V_OUT

40µs/div

REF3112, 3120, 3125, 3130, 3133, 3140

6

SBVS046C

www.ti.com

100µA, and the maximum quiescent current over temperature

is just 135µA. The quiescent current typically changes less

than 2µA over the entire supply range, as shown in Figure 3.

THEORY OF OPERATION

The REF31xx is a family of series, CMOS, precision bandgap

voltage references. The basic bandgap topology is shown in

Figure 1. Transistors Q₁and Q₂are biased such that the

current density of Q₁is greater than that of Q₂. The difference

of the two base-emitter voltages, Vbe₁– Vbe₂, has a positive

temperature coefficient and is forced across resistor R₁. This

voltage is gained up and added to the base-emitter voltage

of Q₂, which has a negative temperature coefficient. The

resulting output voltage is virtually independent of temperature.

QUIESCENT CURRENT vs POWER SUPPLY

100.5

100.0

99.5

99.0

98.5

98.0

V_BANDGAP

1.5

2.5

3.5

4.5

5.5

Power Supply (V)

R₁

+

Vbe₁Vbe₂

–

FIGURE 3. Supply Current vs Supply Voltage.

Q₁

I

N Q₂

Supply voltages below the specified levels can cause the

REF31xx to momentarily draw currents greater than the

typical quiescent current. This can be prevented by using a

power supply with a fast rising edge and low output impedance.

FIGURE 1. Simplified Schematic of Bandgap Reference.

THERMAL HYSTERESIS

APPLICATION INFORMATION

Thermal hysteresis for the REF31xx is defined as the change

in output voltage after operating the device at 25°C, cycling

the device through the specified temperature range, and

returning to 25°C. It can be expressed as:

The REF31xx does not require a load capacitor and is stable

with any capacitive load. Figure 2 shows typical connections

required for operation of the REF31xx. A supply bypass

capacitor of 0.47µF is recommended.

absV_PRE– V_POST

V_HYST

=

• 10⁶ppm

(

)

V_NOM

Where: V_HYST= Thermal hysteresis

V_IN

1

V_PRE= Output voltage measured at 25°C pre-

temperature cycling

0.47µF

3

REF31xx

V_POST= Output voltage measured after the device

has been cycled through the specified temperature

range of –40°C to +125°C and returned to 25°C.

V_OUT

2

TEMPERATURE DRIFT

FIGURE 2. Typical Connections for Operating REF31xx.

The REF31xx is designed to exhibit minimal drift error, defined

as the change in output voltage over varying temperature. The

drift is calculated using the “box” method which is described by

the following equation:

SUPPLY VOLTAGE

The REF31xx family of references features an extremely low

dropout voltage. With the exception of the REF3112, which

has a minimum supply requirement of 1.8V, these references

can be operated with a supply of only 5mV above the output

voltage in an unloaded condition. For loaded conditions, a

typical dropout voltage versus load is shown in the typical

curves.

V_OUTMAX– V_OUTMIN

•10⁶ppm

V_OUT• TemperatureRange

The REF31xx features a typical drift coefficient of 5ppm from

0°C to 70°C—the primary temperature range for many

applications. For the industrial temperature range of –40°C to

125°C, the REF31xx family drift increases to a typical value of

10ppm.

The REF31xx features a low quiescent current, which is

extremely stable over changes in both temperature and

supply. The typical room temperature quiescent current is

REF3112, 3120, 3125, 3130, 3133, 3140

7

SBVS046C

www.ti.com

NOISE PERFORMANCE

APPLICATION CIRCUITS

Typical 0.1Hz to 10Hz voltage noise can be seen in the

Typical Characteristic Curve, 0.1 to 10Hz Voltage Noise. The

noise voltage of the REF31xx increases with output voltage

and operating temperature. Additional filtering may be used

to improve output noise levels, although care should be

taken to ensure the output impedance does not degrade the

AC performance.

Negative Reference Voltage

For applications requiring a negative and positive reference

voltage, the REF31xx and OPA703 can be used to provide

a dual supply reference from a ±5V supply. Figure 5 shows

the REF3125 used to provide a ±2.5V supply reference

voltage. The low drift performance of the REF31xx

complement the low offset voltage and low drift of the

OPA703 to provide an accurate solution for split-supply

applications.

LONG-TERM STABILITY

Long-term stability refers to the change of the output voltage

of a reference over a period of months or years. This effect

lessens as time progresses, as is shown by the long-term

stability curves. The typical drift value for the REF31xx is

70ppm from 0-1000 hours. This parameter is characterized

by measuring 30 units at regular intervals for a period of 1000

hours.

+5V

+2.5V

REF3125

LOAD REGULATION

10kΩ

Load regulation is defined as the change in output voltage

due to changes in load current. The load regulation of the

REF31xx is measured using force and sense contacts as

pictured in Figure 4. The force and sense lines reduce the

impact of contact and trace resistance, resulting in accurate

measurement of the load regulation contributed solely by the

REF31xx. For applications requiring improved load regula-

tion, force and sense lines should be used.

+5V

–2.5V

OPA703

–5V

FIGURE 5. REF3125 Combined with OPA703 to Create

Positive and Negative Reference Voltages.

Output Pin

Contact and

Trace Resistance

DATA ACQUISITION

+

Data acquisition systems often require stable voltage

references to maintain accuracy. The REF31xx family features

stability and a wide range of voltages suitable for most micro-

controllers and data converters. Figure 6, Figure 7, and

Figure 8 show basic data acquisition systems.

V_OUT

–

Force Line

I_L

Sense Line

Load

Meter

FIGURE 4. Accurate Load Regulation of REF31xx.

REF3112, 3120, 3125, 3130, 3133, 3140

8

SBVS046C

www.ti.com

3.3V

REF3133

V+

5Ω

GND

+

1µF to

10µF

V_S

ADS7822

V_REF

V_CC

+

1µF to 10µF

0.1µF

Microcontroller

+In

CS

D_OUT

V_IN

–In

GND

DCLOCK

FIGURE 6. Basic Data Acquisition System 1.

2.5V Supply

5Ω

2.5V

V_IN

+

1µF to 10µF

V_S

ADS8324

V_OUT= 1.25V

V_REF

V_CC

REF3112

+

0.1µF

1µF to 10µF

Microcontroller

+In

CS

D_OUT

GND

0V to 1.25V

–In

GND

DCLOCK

FIGURE 7. Basic Data Acquisition System 2.

5V

REF3140

0.1µF

1µF

V_OUT= 4.096V

1kΩ

10Ω

22µF

+5V

1kΩ

V_REF

V_IN

10Ω

THS4031

ADS8381

6800pF

0.22µF

500Ω

–5V

FIGURE 8. REF3140 Provides an Accurate Reference for Driving the ADS8381.

REF3112, 3120, 3125, 3130, 3133, 3140

9

SBVS046C

www.ti.com

PACKAGE OPTION ADDENDUM

www.ti.com

11-Dec-2006

PACKAGING INFORMATION

Orderable Device

REF3112AIDBZR

REF3112AIDBZRG4

REF3112AIDBZT

REF3112AIDBZTG4

REF3120AIDBZR

REF3120AIDBZRG4

REF3120AIDBZT

REF3120AIDBZTG4

REF3125AIDBZR

REF3125AIDBZRG4

REF3125AIDBZT

REF3125AIDBZTG4

REF3130AIDBZR

REF3130AIDBZRG4

REF3130AIDBZT

REF3130AIDBZTG4

REF3133AIDBZR

REF3133AIDBZRG4

REF3133AIDBZT

REF3133AIDBZTG4

REF3140AIDBZR

REF3140AIDBZRG4

REF3140AIDBZT

REF3140AIDBZTG4

Status ⁽¹⁾

ACTIVE

Package Package

Pins Package Eco Plan ⁽²⁾Lead/Ball Finish MSL Peak Temp ⁽³⁾

Qty

Type

Drawing

SOT-23

DBZ

3