Datasheet

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REF3112

REF3120

REF3125

REF3130

REF3133

REF3140

SBVS046C – DECEMBER 2003 – REVISED FEBRUARY 2006

www.ti.com

DESCRIPTION

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

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

age.

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.

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.

FEATURES

●

Micro

SIZE PACKAGE: SOT23-3

● LOW DROPOUT: 5mV

● HIGH OUTPUT CURRENT: ±10mA

● HIGH ACCURACY: 0.2% max

● LOW I

: 115µA max

●

EXCELLENT SPECIFIED DRIFT PERFORMANCE:

15ppm/°C (max) from 0°C to +70°C

20ppm/°C (max) from –40°C to +125°C

15ppm/°C Max, 100µA, SOT23-3

SERIES VOLTAGE REFERENCE

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.

APPLICATIONS

● PORTABLE, BATTERY-POWERED EQUIPMENT

● DATA ACQUISITION SYSTEMS

● MEDICAL EQUIPMENT

● HAND-HELD TEST EQUIPMENT

PRODUCT VOLTAGE (V)

REF3112 1.25

REF3120 2.048

REF3125 2.5

REF3130 3.0

REF3133 3.3

REF3140 4.096

1IN

2OUT

3 GND

REF3112

REF3120

REF3125

REF3130

REF3133

REF3140

SOT23-3

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.

All trademarks are the property of their respective owners.

Summary of content (17 pages)

PAGE 1
REF3112 REF3120 REF3125 REF3130 REF3133 REF3140 SBVS046C – DECEMBER 2003 – REVISED FEBRUARY 2006 15ppm/°C Max, 100µA, SOT23-3 SERIES VOLTAGE REFERENCE FEATURES DESCRIPTION ● MicroSIZE PACKAGE: SOT23-3 The REF31xx is a family of precision, low power, low dropout, series voltage references available in the tiny SOT23-3 package. ● LOW DROPOUT: 5mV ● HIGH OUTPUT CURRENT: ±10mA ● HIGH ACCURACY: 0.
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ABSOLUTE MAXIMUM RATINGS(1) ELECTROSTATIC DISCHARGE SENSITIVITY Supply Voltage, V+ to V– ................................................................... 7.0V Output Short-Circuit ................................................................. Continuous Operating Temperature .................................................. –55°C to +135°C This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions.
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ELECTRICAL CHARACTERISTICS Boldface limits apply over the specified temperature range, TA = –40°C to +125°C. At TA = +25°C, ILOAD = 0mA, VIN = +5V, unless otherwise noted. REF31xx PARAMETER CONDITIONS MIN TYP MAX UNITS 2.9940 –0.2 3.0 3.0060 0.2 V % REF3130 – 3.0V OUTPUT VOLTAGE Initial Accuracy VOUT NOISE Output Voltage Noise Voltage Noise f = 0.1Hz to 10Hz f = 10Hz to 10kHz µVPP µVrms 39 57 REF3133 – 3.3V OUTPUT VOLTAGE Initial Accuracy VOUT 3.2934 –0.
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TYPICAL CHARACTERISTICS At TA = +25°C, VIN = +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 25 20 14 Percentage of Units Percentage of Units 16 12 10 8 6 4 15 10 5 2 0 0 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) Drift (ppm/°C) DROPOUT VOLTAGE vs LOAD CURRENT OUTPUT VOLTAGE vs TEMPERATURE 120 0.16 0.
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TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = +5V power supply, REF3125 is used for typical characteristics, unless otherwise noted. PSRR vs FREQUENCY OUTPUT vs SUPPLY 2.505 +125°C 80 2.504 70 2.503 60 Output (V) Power-Supply Rejection Ratio (dB) 90 50 40 30 2.502 2.501 +25°C 2.500 20 −40°C 2.499 10 2.498 0 1 10 100 1k 10k 100k 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 Frequency (Hz) Supply (V) OUTPUT VOLTAGE vs LOAD CURRENT STEP RESPONSE, CL = 0, 5V STARTUP 6.0 6.5 2.
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TYPICAL CHARACTERISTICS (Cont.) At TA = +25°C, VIN = +5V power supply, REF3125 is used for typical characteristics, unless otherwise noted.
PAGE 7
The REF31xx is a family of series, CMOS, precision bandgap voltage references. The basic bandgap topology is shown in Figure 1. Transistors Q1 and Q2 are biased such that the current density of Q1 is 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.
PAGE 8
APPLICATION CIRCUITS NOISE PERFORMANCE 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.
PAGE 9
3.3V REF3133 V+ 5Ω GND + 1µF to 10µF VS ADS7822 VREF VCC + 0.1µF VIN +In CS –In DOUT GND 1µF to 10µF Microcontroller DCLOCK FIGURE 6. Basic Data Acquisition System 1. 2.5V Supply 5Ω 2.5V + VIN VS ADS8324 REF3112 VOUT = 1.25V VREF VCC + 0.1µF 0V to 1.25V GND 1µF to 10µF +In CS –In DOUT GND 1µF to 10µF Microcontroller DCLOCK FIGURE 7. Basic Data Acquisition System 2. 5V REF3140 0.1µF 1µF VOUT = 4.096V 1kΩ 10Ω 22µF +5V 1kΩ VIN VREF 10Ω ADS8381 THS4031 6800pF 0.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 11-Apr-2014 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
PAGE 13
PACKAGE MATERIALS INFORMATION www.ti.com 13-Aug-2011 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) REF3112AIDBZR SOT-23 DBZ 3 3000 179.0 8.4 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.15 2.95 1.22 4.0 8.0 Q3 REF3112AIDBZT SOT-23 DBZ 3 250 179.0 8.4 3.15 2.95 1.22 4.0 8.0 Q3 REF3120AIDBZR SOT-23 DBZ 3 3000 179.0 8.4 3.15 2.95 1.22 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 13-Aug-2011 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) REF3112AIDBZR SOT-23 DBZ 3 3000 203.0 203.0 35.0 REF3112AIDBZT SOT-23 DBZ 3 250 203.0 203.0 35.0 REF3120AIDBZR SOT-23 DBZ 3 3000 203.0 203.0 35.0 REF3120AIDBZT SOT-23 DBZ 3 250 203.0 203.0 35.0 REF3125AIDBZR SOT-23 DBZ 3 3000 203.0 203.0 35.0 REF3125AIDBZT SOT-23 DBZ 3 250 203.0 203.0 35.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.