1GND_F
GND_S
3
2
ENABLE
5
6
4
OUT_S
IN
OUT_F
REF3212
REF3220
REF3225
REF3230
REF3233
REF3240
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
www.ti.com
SBVS058C –JUNE 2005–REVISED AUGUST 2011
4ppm/°C, 100μA, SOT23-6
SERIES VOLTAGE REFERENCE
Check for Samples: REF3212,REF3220,REF3225,REF3230,REF3233,REF3240
1FEATURES DESCRIPTION
The REF32xx is a very low drift, micropower,
2•Excellent Specified Drift Performance: low-dropout, precision voltage reference family
–7ppm/°C (max) at 0°C to +125°Cavailable in the tiny SOT23-6 package.
–20ppm/°C (max) at –40°C to +125°CThe small size and low power consumption (120μA
•Microsize Package: SOT23-6 max) of the REF32xx make it ideal for portable and
•High Output Current: ±10mA battery-powered applications. This reference is stable
with any capacitive load.
•High Accuracy: 0.01% The REF32xx can be operated from a supply as low
•Low Quiescent Current: 100μAas 5mV above the output voltage, under no load
•Low Dropout: 5mV conditions. All models are specified for the wide
temperature range of –40°C to +125°C.
APPLICATIONS
•Portable Equipment AVAILABLE OUTPUT VOLTAGES
PRODUCT VOLTAGE
•Data Acquisition Systems REF3212 1.25V
•Medical Equipment REF3220 2.048V
•Test Equipment REF3225 2.5V
REF3230 3.0V
REF3233 3.3V
REF3240 4.096
1Please 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.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright ©2005–2011, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
1GND_F
GND_S
3
2
ENABLE
5
6
4
OUT_S
IN
OUT_F
R32x
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
SBVS058C –JUNE 2005–REVISED AUGUST 2011
www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
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 INFORMATION(1)
PACKAGE
PRODUCT OUTPUT VOLTAGE PACKAGE-LEAD DESIGNATOR PACKAGE MARKING
REF3212 1.25V SOT23-6 DBV R32A
REF3220 2.048V SOT23-6 DBV R32B
REF3225 2.5V SOT23-6 DBV R32C
REF3230 3.0V SOT23-6 DBV R32D
REF3233 3.3V SOT23-6 DBV R32E
REF3240 4.096 SOT23-6 DBV R32F
(1) For the most current package and ordering information see the Package Option Addendum at the end of this document, or visit the
device product folder at www.ti.com.
ABSOLUTE MAXIMUM RATINGS(1)
Over operating free-air temperature range (unless otherwise noted). REF32xx UNIT
Input voltage +7.5 V
Output short-circuit Continuous
Operating temperature –55 to +135 °C
Storage temperature –65 to +150 °C
Junction temperature +150 °C
Human body model (HBM) 4 kV
ESD ratings Charged device model (CDM) 1 kV
Machine model (MM) 400 V
(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.
PIN DESCRIPTIONS
PIN CONFIGURATION PIN
NAME NO. FUNCTION DESCRIPTION
DBV PACKAGE
SOT23-6 This pin enables and
ENABLE 3 Digital input
(TOP VIEW) disables the device
Ground connection of the
GND_F 1 Analog output device
GND_S 2 Analog input Ground sense at the load
IN 4 Analog input Positive supply voltage
Output of Reference
OUT_F 6 Analog output Voltage
Sense connection at the
NOTE:: The location of pin 1 on the REF32xx is OUT_S 5 Analog input load
determined by orienting the package
marking as shown in the diagram above.
2Copyright ©2005–2011, Texas Instruments Incorporated
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
www.ti.com
SBVS058C –JUNE 2005–REVISED AUGUST 2011
ELECTRICAL CHARACTERISTICS
Boldface limits apply over the listed temperature range.
At TA= +25°C, ILOAD = 0mA, and VIN = 5V, unless otherwise noted. REF32xx
PARAMETER CONDITIONS MIN TYP MAX UNIT
REF3212 (1.25V)
OUTPUT VOLTAGE, VOUT 1.2475 1.25 1.2525 V
Initial accuracy –0.2 0.01 0.2 %
NOISE
Output voltage noise f = 0.1Hz to 10Hz 17 µVPP
Voltage noise f = 10Hz to 10kHz 24 µVRMS
REF3220 (2.048V)
OUTPUT VOLTAGE, VOUT 2.044 2.048 2.052 V
Initial accuracy –0.2 0.01 0.2 %
NOISE
Output voltage noise f = 0.1Hz to 10Hz 27 µVPP
Voltage noise f = 10Hz to 10kHz 39 µVRMS
REF3225 (2.5V)
OUTPUT VOLTAGE, VOUT 2.495 2.50 2.505 V
Initial accuracy –0.2 0.01 0.2 %
NOISE
Output voltage noise f = 0.1Hz to 10Hz 33 µVPP
Voltage noise f = 10Hz to 10kHz 48 µVRMS
REF3230 (3V)
OUTPUT VOLTAGE, VOUT 2.994 3 3.006 V
Initial accuracy –0.2 0.01 0.2 %
NOISE
Output voltage noise f = 0.1Hz to 10Hz 39 µVPP
Voltage noise f = 10Hz to 10kHz 57 µVRMS
REF3233 (3.3V)
OUTPUT VOLTAGE, VOUT 3.293 3.3 3.307 V
Initial accuracy –0.2 0.01 0.2 %
NOISE
Output voltage noise f = 0.1Hz to 10Hz 43 µVPP
Voltage noise f = 10Hz to 10kHz 63 µVRMS
REF3240 (4.096V)
OUTPUT VOLTAGE, VOUT 4.088 4.096 4.104 V
Initial accuracy –0.2 0.01 0.2 %
NOISE
Output voltage noise f = 0.1Hz to 10Hz 53 µVPP
Voltage noise f = 10Hz to 10kHz 78 µVRMS
Copyright ©2005–2011, Texas Instruments Incorporated 3
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
SBVS058C –JUNE 2005–REVISED AUGUST 2011
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Boldface limits apply over the listed temperature range.
At TA= +25°C, ILOAD = 0mA, and VIN = 5V, unless otherwise noted. REF32xx
PARAMETER CONDITIONS MIN TYP MAX UNIT
REF3212 / REF3220 / REF3225 / REF3230 / REF3233 / REF3240
OUTPUT VOLTAGE TEMP dVOUT/dT
DRIFT
0°C≤TA≤+125°C 4 7 ppm/°C
–40°C≤TA≤+125°C 10.5 20 ppm/°C
LONG-TERM STABILITY 0 to 1000h 55 ppm
LINE REGULATION VOUT + 0.05(1) ≤VIN ≤5.5V –65 15 +65 ppm/V
LOAD REGULATION(2) dVOUT/dILOAD
Sourcing 0mA <ILOAD <10mA, VIN = VOUT + 250mV(1) –40 3 40 µV/mA
Sinking –10mA <ILOAD <0mA, VIN = VOUT + 100mV(1) –60 20 60 µV/mA
THERMAL HYSTERESIS(3) dT
First cycle 100 ppm
Additional cycles 25 ppm
DROPOUT VOLTAGE(1) VIN –VOUT 0°C≤TA≤+125°C 5 50 mV
OUTPUT CURRENT ILOAD VIN = VOUT + 250mV(1) –10 10 mA
SHORT-CIRCUIT CURRENT ISC
Sourcing 50 mA
Sinking 40 mA
TURN-ON SETTLING TIME To 0.1% at VIN = 5V with CL= 0 60 µs
ENABLE/SHUTDOWN(4)
VLReference in Shutdown mode 0 0.7 V
VHReference is active 1.5 VIN V
POWER SUPPLY IL= 0
Voltage VIN VOUT + 0.05(1) 5.5 V
Current IQENABLE >1.5V 100 120 µA
.. Over temperature 0°C≤TA≤+125°C 115 135 µA
Shutdown ISENABLE <0.7V 0.1 1 µA
TEMPERATURE RANGE
Specified –40 +125 °C
Operating –55 +135 °C
Storage –65 +150 °C
Thermal resistance, SOT23-6 θJA 200 °C/W
(1) The minimum supply voltage for the REF3212 is 1.8V.
(2) Load regulation is using force and sense lines; see the Load Regulation section for more information.
(3) Thermal hysteresis procedure is explained in more detail in the Applications Information TBD section.
(4) If the rise time of the input voltage is less than or equal to 2ms, the ENABLE and IN pins can be tied together. For rise times greater
than 2ms, see the Supply Voltage section.
4Copyright ©2005–2011, Texas Instruments Incorporated
Population
0.5 1.5 2.5 3.5 4.5
Drift(ppm/ C)°
76.5654321 5.5
Population
1 2 3 4 5 6 7 8 9
Drift(ppm/ C)°
17 18 19 2016151413121110
0.12
0.08
0.04
0
-0.04
-0.08
-0.12
OutputVoltageAccuracy(%)
-50 -25 0 +25 +50 +75 +100 +125
Temperature( C)°
160
140
120
100
80
60
40
20
0
DropoutVoltage(mV)
-15 151050-5-10
LoadCurrent(mA)
- °40 C
+25 C°
+125 C°
130
120
110
100
90
80
70
QuiescentCurrent( A)m
-50 -25 0 +25 +50 +75 +125+100
Temperature( C)°
100
90
80
70
60
50
40
30
20
10
PSRR(dB)
1 10 100 1k 10k 100k
Frequency(Hz)
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
www.ti.com
SBVS058C –JUNE 2005–REVISED AUGUST 2011
TYPICAL CHARACTERISTICS
At TA= +25°C, ILOAD = 0mA, VIN = +5V power supply, and REF3225 used for typical characteristics, unless otherwise noted.
TEMPERATURE DRIFT TEMPERATURE DRIFT
(0°C to +125°C) (–40°C to +125°C)
Figure 1. Figure 2.
OUTPUT VOLTAGE ACCURACY vs TEMPERATURE DROPOUT VOLTAGE vs LOAD CURRENT
Figure 3. Figure 4.
QUIESCENT CURRENT vs TEMPERATURE POWER-SUPPLY REJECTION RATIO vs FREQUENCY
Figure 5. Figure 6.
Copyright ©2005–2011, Texas Instruments Incorporated 5
1.2525
1.2520
1.2515
1.2510
1.2505
1.2500
1.2495
1.2490
1.2485
1.2480
1.2475
OutputVoltage(V)
1.5 2.5 3.53 4.542 5
InputVoltage(V)
+125 C°
+25 C°
- °40 C
2.505
2.504
2.503
2.502
2.501
2.500
2.499
2.498
2.497
2.496
2.495
OutputVoltage(V)
-15 -10 -5 0 5 10 15
LoadCurrent(mA)
+125 C°
+25 C°
- °40 C
Population
-0.20
-0.16
-0.12
-0.08
-0.04
0
0.04
0.08
0.20
OutputAccuracy(%)
0.16
0.12
10 s/divm
VIN
VOUT
1V/div
100ms/div
VIN
VOUT
1V/div
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
SBVS058C –JUNE 2005–REVISED AUGUST 2011
www.ti.com
TYPICAL CHARACTERISTICS (continued)
At TA= +25°C, ILOAD = 0mA, VIN = +5V power supply, and REF3225 used for typical characteristics, unless otherwise noted.
OUTPUT VOLTAGE vs INPUT VOLTAGE
(REF3212) OUTPUT VOLTAGE vs LOAD CURRENT
Figure 7. Figure 8.
0.1Hz TO 10Hz NOISE OUTPUT VOLTAGE INITIAL ACCURACY
Figure 9. Figure 10.
STEP RESPONSE STEP RESPONSE
CL= 0pF, 5V STARTUP CL= 1µF
Figure 11. Figure 12.
6Copyright ©2005–2011, Texas Instruments Incorporated
20mV/div 500mV/div
20 s/divm
VIN
VOUT
100 s/divm
20mV/div 500mV/div
VIN
VOUT
40 s/divm
200mV/div
-10mA
+10mA
+10mA
ILOAD
VOUT
40 s/divm
50mV/div
+10mA
+10mA
-10mA
VOUT
ILOAD
40 s/divm
100mV/div
-1mA
+1mA
+1mA
VOUT
ILOAD
40 s/divm
20mV/div
+1mA
-1mA
+1mA
VOUT
ILOAD
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
www.ti.com
SBVS058C –JUNE 2005–REVISED AUGUST 2011
TYPICAL CHARACTERISTICS (continued)
At TA= +25°C, ILOAD = 0mA, VIN = +5V power supply, and REF3225 used for typical characteristics, unless otherwise noted.
LINE TRANSIENT LINE TRANSIENT
CL= 0pF CL= 10µF
Figure 13. Figure 14.
LOAD TRANSIENT LOAD TRANSIENT
CL= 0pF, ±10mA OUTPUT PULSE CL= 1µF, ±10mA OUTPUT PULSE
Figure 15. Figure 16.
LOAD TRANSIENT LOAD TRANSIENT
CL= 0pF, ±1mA OUTPUT PULSE CL= 1µF, ±1mA OUTPUT PULSE
Figure 17. Figure 18.
Copyright ©2005–2011, Texas Instruments Incorporated 7
200
150
100
50
0
-50
-100
-150
-200
OutputVoltageStability(ppm)
0 400200 600 800 1000 1200
Time(Hours)
1
2
3
6
5
4
+2.5V
0.47 Fm
+5V
R32C
VBANDGAP
Vbe1
-
+
Vbe2
-
+
R1
Q2
NQ1I
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
SBVS058C –JUNE 2005–REVISED AUGUST 2011
www.ti.com
TYPICAL CHARACTERISTICS (continued)
At TA= +25°C, ILOAD = 0mA, VIN = +5V power supply, and REF3225 used for typical characteristics, unless otherwise noted.
LONG-TERM STABILITY
(32 Units)
Figure 19.
THEORY OF OPERATION
GENERAL DESCRIPTION APPLICATION INFORMATION
The REF32xx is a family of CMOS, precision The REF32xx does not require a load capacitor and
bandgap voltage references. Figure 20 shows the is stable with any capacitive load. Figure 21 shows
basic bandgap topology. Transistors Q1and Q2are typical connections required for operation of the
biased so that the current density of Q1is greater REF32xx. A supply bypass capacitor of 0.47μF is
than that of Q2. The difference of the two recommended.
base-emitter voltages (Vbe1–Vbe2) has a positive
temperature coefficient and is forced across resistor
R1. This voltage is amplified and added to the
base-emitter voltage of Q2, which has a negative
temperature coefficient. The resulting output voltage
is virtually independent of temperature.
Figure 21. Typical Operating Connections for the
REF3225
SUPPLY VOLTAGE
The REF32xx family of references features an
extremely low dropout voltage. With the exception of
the REF3212, which has a minimum supply
requirement of 1.8V, these references can be
operated with a supply of only 5mV above the output
Figure 20. Simplified Schematic of Bandgap voltage in an unloaded condition. For loaded
Reference conditions, a typical dropout voltage versus load is
shown in the Typical Characteristic curves.
8Copyright ©2005–2011, Texas Instruments Incorporated
110
108
106
104
102
100
98
96
94
QuiescentCurrent( A)m
1.5 2.0 3.0 4.02.5 3.5 4.5 6.05.0 5.5
PowerSupply(V)
1
2
3
6
5
4
VREF
R1
C1
VIN
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
www.ti.com
SBVS058C –JUNE 2005–REVISED AUGUST 2011
The REF32xx also features a low quiescent current of The RC filter in Figure 23 can be used as a starting
100μA, with a maximum quiescent current over point for the REF3240. The values for R1and C1
temperature of just 135μA. The quiescent current have been calculated so that the voltage at the
typically changes less than 2μA over the entire supply ENABLE pin reaches 0.7V after the input voltage has
range, as shown in Figure 22.reached 4.15V; Table 1 lists these values. For output
voltage options other than 4.096V, the RC filter can
be made faster.
Table 1. Recommended R1and C1Values for the
REF3240
RISE TIME R1VALUE C1VALUE
2ms 150kΩ100nF
5ms 150kΩ220nF
10ms 330kΩ220nF
20ms 390kΩ330nF
50ms 680kΩ470nF
100ms 680kΩ1000nF
In this document, rise time is defined as the time until
an exponential input signal reaches 90% of its final
Figure 22. Supply Current vs Supply Voltage voltage. For example, the 2ms value shown in
Table 1 is valid for an end value of 5V.
Supply voltages below the specified levels can cause If the input voltage has a different shape or the end
the REF32xx to momentarily draw currents greater value is not 5V, then the time until the minimum
than the typical quiescent current. This momentary dropout voltage has been reached should be used to
current draw can be prevented by using a power decide if the IN and ENABLE pins can be tied
supply with a fast rising edge and low output together. Table 2 lists these times.
impedance.
Table 2. Minimum Dropout Voltage Times
For optimal startup when the IN pin and ENABLE pin
are tied together, keep the input voltage rise time less DEVICE TIME
than or equal to 2ms. For rise times greater than REF3212 0.4ms
2ms, the ENABLE pin must be kept below 0.7V until REF3220 0.5ms
the voltage at the IN pin has reached the minimum
operating voltage. One way to control the voltage at REF3225 0.7ms
the ENABLE pin is with an additional RC filter, such REF3230 0.9ms
as that shown in Figure 23. The RC filter must hold REF3233 1.0ms
the voltage at the ENABLE pin below the threshold REF3240 1.6ms
voltage until the voltage at the input pin has reached
the minimum operating voltage. Note that because the leakage current of the EN pin
is in the range of a few nA, it can be disregarded in
most applications.
SHUTDOWN
The REF32xx can be placed in a low-power mode by
pulling the ENABLE/SHUTDOWN pin low. When in
Shutdown mode, the output of the REF32xx becomes
a resistive load to ground. The value of the load
depends on the model, and ranges from
approximately 100kΩto 400kΩ.
Figure 23. Application Circuit to Control the
REF32xx ENABLE Pin
Copyright ©2005–2011, Texas Instruments Incorporated 9
V =
HYST
V V-
PRE POST
VNOM
´10 (ppm)
6
(
(
Drift= V V-
OUTMAX OUTMIN
VOUT TempRange´´10 (ppm)
6
(
(
1
2
3
6
5
4RLOAD
0.47 Fm
+5V
GND_F
ContactandTraceResistance
GND_S
ENABLE
OUT_F
OUT_S
IN
REF32xx
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
SBVS058C –JUNE 2005–REVISED AUGUST 2011
www.ti.com
THERMAL HYSTERESIS LONG-TERM STABILITY
Thermal hysteresis for the REF32xx is defined as the Long-term stability refers to the change of the output
change in output voltage after operating the device at voltage of a reference over a period of months or
+25°C, cycling the device through the specified years. This effect lessens as time progresses, as is
temperature range, and returning to +25°C. It can be shown by the long-term stability Typical Characteristic
expressed as: curves. The typical drift value for the REF32xx is
55ppm from 0 to 1000 hours. This parameter is
characterized by measuring 30 units at regular
intervals for a period of 1000 hours.
Where: LOAD REGULATION
VHYST = thermal hysteresis (in units of ppm). Load regulation is defined as the change in output
VNOM = the specified output voltage. voltage as a result of changes in load current. The
VPRE = output voltage measured at +25°Cload regulation of the REF32xx is measured using
pretemperature cycling. force and sense contacts, as shown in Figure 24.
VPOST = 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. (1)
TEMPERATURE DRIFT
The REF32xx is designed to exhibit minimal drift
error, which is defined as the change in output
voltage over varying temperature. The drift is
calculated using the box method, as described by
Equation 2:
(2)
The REF32xx features a typical drift coefficient of
4ppm/°C from 0°C to +125°C—the primary
temperature range for many applications. For the
extended industrial temperature range of –40°C to Figure 24. Accurate Load Regulation of REF32xx
+125°C, the REF32xx family drift increases to a
typical value of 10.5ppm/°C. The force and sense lines can be used to effectively
NOISE PERFORMANCE eliminate the impact of contact and trace resistance,
resulting in accurate voltage at the load. By
Typical 0.1Hz to 10Hz voltage noise can be seen in connecting the force and sense lines at the load, the
the Typical Characteristic curve, 0.1Hz to 10Hz REF32xx compensates for the contact and trace
Voltage Noise. The noise voltage of the REF32xx resistances because it measures and adjusts the
increases with output voltage and operating voltage actually delivered at the load.
temperature. Additional filtering can be used to
improve output noise levels, although care should be The GND_S pin is connected to the internal ground of
taken to ensure the output impedance does not the device through ESD protection diodes. Because
degrade AC performance. of that connection, the maximum differential voltage
between the GND_S and GND_F pins must be kept
below 200mV to prevent these dioes from
unintentionally turning on.
10 Copyright ©2005–2011, Texas Instruments Incorporated
-2.5V
+2.5V
+5V
12
5
6
3 4
R1
10kWR2
10kW
-5V
+5V
OPA735
REF3225
ADS7822
REF3233
VCC
CS
DOUT
DCLOCK
VREF
+In
-In
GND
GND
VIN
VS
+
+
5W
1mFto10mF
0.47 Fm
1 Fto10 Fm m
0.1 Fm
Microcontroller
V+
3.3V
2 1
35
64
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
www.ti.com
SBVS058C –JUNE 2005–REVISED AUGUST 2011
APPLICATION CIRCUITS
NEGATIVE REFERENCE VOLTAGE
For applications requiring a negative and positive
reference voltage, the REF32xx and OPA735 can be
used to provide a dual-supply reference from a ±5V
supply. Figure 25 shows the REF3225 used to
provide a ±2.5V supply reference voltage. The low
drift performance of the REF32xx complements the
low offset voltage and zero drift of the OPA735 to
provide an accurate solution for split-supply
applications. Care must be taken to match the
temperature coefficients of R1and R2.
DATA ACQUISITION
Data acquisition systems often require stable voltage
references to maintain accuracy. The REF32xx family
features stability and a wide range of voltages NOTE:: Bypass capacitor is not shown.
suitable for most microcontrollers and data
converters. Figure 26,Figure 27, and Figure 28 show Figure 25. REF3225 Combined with OPA735 to
basic data acquisition systems. Create Positive and Negative Reference Voltages
Figure 26. Basic Data Acquisition System 1
Copyright ©2005–2011, Texas Instruments Incorporated 11
ADS8324
REF3212
VCC
CS
DOUT
DCLOCK
VREF
+In
-In
GND
GND
VS
VIN
+
+
5W
1 Fto10 Fm m
1 Fto10 Fm m
0.1 Fm
0Vto1.25V
V =1.25V
OUT
Microcontroller
2.5VSupply
2.5V
12
3 4
5
6
ADS8381
REF3240
10W1kW
1kW
10W
0.1 Fm1 Fm
22 Fm
V = 4.096V
OUT
VREF
+5V
5 6
3
4
2
1
500W
0.22 Fm
THS4031
+5V
-5V
VIN
6800pF
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
SBVS058C –JUNE 2005–REVISED AUGUST 2011
www.ti.com
Figure 27. Basic Data Acquisition System 2
Figure 28. REF3240 Provides an Accurate Reference for Driving the ADS8381
12 Copyright ©2005–2011, Texas Instruments Incorporated
REF3212, REF3220
REF3225, REF3230
REF3233, REF3240
www.ti.com
SBVS058C –JUNE 2005–REVISED AUGUST 2011
REVISION HISTORY
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (February 2006) to Revision C Page
•Added Pin Descriptions table ................................................................................................................................................ 2
•Added note to Enable/Shutdown parameter ......................................................................................................................... 4
•Changed the minimum voltage for Enable/Shutdown with reference active from (0.75 ×VIN) to 1.5 .................................. 4
•Changed Current test condition from from (0.75 ×VIN) to (1.5V) ......................................................................................... 4
•Added text, two tables, and one figure to Supply Voltage section ....................................................................................... 8
•Changed pin 3 in Figure 24 from SHDN to ENABLE (typo) ............................................................................................... 10
•Added paragraph to Load Regulation section .................................................................................................................... 10
Copyright ©2005–2011, Texas Instruments Incorporated 13
PACKAGING INFORMATION
Orderable Device Status (1) Package
Type Package
Drawing Pins Package
Qty Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)
REF3212AIDBVR ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3212AIDBVRG4 ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3212AIDBVT ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3212AIDBVTG4 ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3220AIDBVR ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3220AIDBVRG4 ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3220AIDBVT ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3220AIDBVTG4 ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3225AIDBVR ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3225AIDBVRG4 ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3225AIDBVT ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3225AIDBVTG4 ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3230AIDBVR ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3230AIDBVRG4 ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3230AIDBVT ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3230AIDBVTG4 ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3233AIDBVR ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3233AIDBVRG4 ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3233AIDBVT ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3233AIDBVTG4 ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3240AIDBVR ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3240AIDBVRG4 ACTIVE SOT-23 DBV 6 3000 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3240AIDBVT ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
REF3240AIDBVTG4 ACTIVE SOT-23 DBV 6 250 Green (RoHS &
no Sb/Br) CU NIPDAU Level-2-260C-1 YEAR
(1) The marketing status values are defined as follows:
PACKAGE OPTION ADDENDUM
www.ti.com 25-Nov-2008
Addendum-Page 1
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in
a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check
http://www.ti.com/productcontent for the latest availability information and additional product content details.
TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS
compatible) as defined above.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)
(3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder
temperature.
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited
information may not be available for release.
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI
to Customer on an annual basis.
OTHER QUALIFIED VERSIONS OF REF3212, REF3220, REF3225, REF3230, REF3233, REF3240 :
•Enhanced Product: REF3212-EP,REF3220-EP,REF3225-EP,REF3230-EP,REF3233-EP,REF3240-EP
NOTE: Qualified Version Definitions:
•Enhanced Product - Supports Defense, Aerospace and Medical Applications
PACKAGE OPTION ADDENDUM
www.ti.com 25-Nov-2008
Addendum-Page 2
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
REF3212AIDBVR SOT-23 DBV 6 3000 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3212AIDBVT SOT-23 DBV 6 250 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3220AIDBVR SOT-23 DBV 6 3000 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3220AIDBVT SOT-23 DBV 6 250 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3225AIDBVR SOT-23 DBV 6 3000 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3225AIDBVT SOT-23 DBV 6 250 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3230AIDBVR SOT-23 DBV 6 3000 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3230AIDBVT SOT-23 DBV 6 250 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3233AIDBVR SOT-23 DBV 6 3000 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3233AIDBVT SOT-23 DBV 6 250 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3240AIDBVR SOT-23 DBV 6 3000 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
REF3240AIDBVT SOT-23 DBV 6 250 180.0 8.4 3.2 3.1 1.39 4.0 8.0 Q3
PACKAGE MATERIALS INFORMATION
www.ti.com 17-Dec-2011
Pack Materials-Page 1
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
REF3212AIDBVR SOT-23 DBV 6 3000 210.0 185.0 35.0
REF3212AIDBVT SOT-23 DBV 6 250 210.0 185.0 35.0
REF3220AIDBVR SOT-23 DBV 6 3000 210.0 185.0 35.0
REF3220AIDBVT SOT-23 DBV 6 250 210.0 185.0 35.0
REF3225AIDBVR SOT-23 DBV 6 3000 210.0 185.0 35.0
REF3225AIDBVT SOT-23 DBV 6 250 210.0 185.0 35.0
REF3230AIDBVR SOT-23 DBV 6 3000 210.0 185.0 35.0
REF3230AIDBVT SOT-23 DBV 6 250 210.0 185.0 35.0
REF3233AIDBVR SOT-23 DBV 6 3000 210.0 185.0 35.0
REF3233AIDBVT SOT-23 DBV 6 250 210.0 185.0 35.0
REF3240AIDBVR SOT-23 DBV 6 3000 210.0 185.0 35.0
REF3240AIDBVT SOT-23 DBV 6 250 210.0 185.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 17-Dec-2011
Pack Materials-Page 2
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