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VRE3041
Low Cost
Precision Reference
THALER CORPORATION • 2015 N. FORBES BOULEVARD • TUCSON, AZ. 85745 • (520) 882-4000
FEATURES
4.096 V Output ± 0.409 mV (.01%)
Temperature Drift: 0.6 ppm/°C
Low Noise: 3µV p-p (0.1Hz-10Hz)
Low Thermal Hysteresis: 1 ppm Typ.
±15mA Output Source and Sink Current
Excellent Line Regulation: 5 ppm/V Typ.
Optional Noise Reduction and Voltage Trim
Industry Standard Pinout
PIN CONFIGURATION
N/C 1
VRE3041
+VIN 2
N/C 3
TOP
VIEW
GND 4
8
NOISE
REDUCTION
7 N/C
6 VOUT
5 TRIM
FIGURE 1
DESCRIPTION
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DataShee
The VRE3041 is a low cost, high precision 4.096V
reference that operates from +10V. The device
features a buried zener for low noise and excellent
long term stability. Packaged in an 8 pin DIP and
SMT, the device is ideal for high resolution data
conversion systems.
The device provides ultrastable +4.096V output
with ±0.4096 mV (.01%) initial accuracy and a
temperature coefficient of 0.6 ppm/°C. This
improvement in accuracy is made possible by a
unique, patented multipoint laser compensation
technique developed by Thaler Corporation.
Significant improvements have been made in
other performance parameters as well, including
initial accuracy, warm-up drift, line regulation, and
long-term stability, making the VRE3041 series
the most accurate reference available.
For enhanced performance, the VRE3041 has an
external trim option for users who want less than
0.01% initial error. For ultra low noise
applications, an external capacitor can be
attached between the noise reduction pin and the
ground pin.
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The VRE3041 is recommended for use as a
reference for 14, 16, or 18 bit data converters
which require an external precision reference.
The device is also ideal for calibrating scale factor
on high resolution data converters. The VRE3041
offers superior performance over monolithic
references.
SELECTION GUIDE
Model
VRE3041A
VRE3041B
VRE3041C
VRE3041J
VRE3041K
VRE3041L
Initial
Error
mV
0.410
0.614
0.820
0.410
0.614
0.820
Temp.
Coeff.
ppm/°C
0.6
1.0
2.0
0.6
1.0
2.0
Temp.
Range °C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
For package option add D for DIP or S for Surface Mount
to end of model number.
VRE3041DS REV. D JULY 2000

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ABSOLUTE MAXIMUM RATINGS
Power Supply ………………………-0.3V to +40V
OUT, TRIM …………………………-0.3V to +12V
NR……………………………………-0.3V to +6V
Operating Temp. (A,B,C)……………0 °C to 70°C
Operating Temp. (J,K,L)……………-40 °C to 85°C
Out Short Circuit to GND Duration (VIN< 12V)…...Continuous
Out Short Circuit to GND Duration (VIN< 40V)…….……5 sec
Out Short Circuit to IN Duration (VIN< 12V)……...Continuous
Continuous Power Dissipation (TA = +70°C)………...300mW
Storage Temperature………………………..…-65°C to 150°C
Lead Temperature (soldering,10 sec)…………………..250°C
ELECTRICAL SPECIFICATIONS
Vps =+10V, T = 25°C, Iout=0mA unless otherwise noted.
PARAMETER
Input Voltage
SYMBOL
VIN
Output Voltage
(Note 1)
VOUT
Output Voltage
Temperature Coefficient
(Note 2)
et4U.com Trim Adjustment Range
Turn-On Settling Time
Output Noise Voltage
Temperature Hysterisis
TCVOUT
VOUT
Ton
en
CONDITIONS
VRE3041A/J
VRE3041B/K
VRE3041C/L
VRE3041A/J
VRE3041B/K
VRE3041C/K
Figure 3
To 0.D01a%taSohf efienta4lUv.aclouem
0.1Hz<f<10Hz
10Hz<f<1kHz
Note 4
Long Term Stability
VOUT/t
Supply Current
Load Regulation
Line Regulation
IIN
VOUT/
IOUT
VOUT/
VIN
Sourcing:
0mA IOUT 15mA
Sinking:
-15mA IOUT 0mA
8V VIN 10V
10V VIN 18V
Notes:
1) The specified values are without external trim.
2) The temperature coefficient is determined by the
box method. See discussion on temperature
performance.
3) Line and load regulation are measured with pulses and
do not include voltage changes due to temperature.
4) Hysterisis measured over the operating temperature
range.
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MIN TYP MAX
8 36
4.0956 4.096 4.0964
4.0954 4.096 4.0966
4.0952 4.096 4.0968
0.3 0.6
0.5 1.0
1.0 2.0
±4
2
2.4
24
1
6
3.5 4.0
8 12
8 12
25 35
5 10
UNITS
V
V
ppm/°C
mV DataShee
µs
µVp-p
µVRMS
ppm
ppm/
1khrs
mA
ppm/
mA
ppm/V
VRE3041DS REV. D JULY 2000

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TYPICAL PERFORMANCE CURVES
VOUT vs. TEMPERATURE
1.00
0.75
0.50
0.25
U pUppeprer LLimimiitt
0
-0.25
-0.50
LowLoewrer LLi mimiitt
-0.75
-1.00 0 20 30 40 50 60 70
Temperature (oC)
VRE3041A
VOUT vs. TEMPERATURE
1.00
0.75
0.50
0.25
Upper Limit
0
-0.25
-0.50
Lower Limit
-0.75
-1.00 0 20 30 40 50 60 70
Temperature (oC)
VRE3041B
VOUT vs. TEMPERATURE
1.00
0.75
0.50
Upper Limit
0.25
0
-0.25
-0.50
-0.75
Lower Limit
-1.00 0 20 30 40 50 60 70
Temperature (oC)
VRE3041C
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VOUT vs. TEMPERATURE
2.0
1.5
1.0
0.5
0
-0.5
-1.0
-1.5
-2.0
-50 -25
Upper Limit
Lower Limit
0 25 50
75 100
Temperature (oC)
VRE3041J
VOUT vs. TEMPERATURE
2.0
1.5
1.0
Upper Limit
0.5
0 DataSheet4U.com
-0.5
Lower Limit
-1.0
-1.5
-2.0
-50 -25
0
25 50 75 100
Temperature (oC)
VRE3041K
VOUT vs. TEMPERATURE
2.0
1.5
Upper Limit
1.0
0.5
0
-0.5
-1.0
-1.5
Lower Limit
-2.0
-50 -25 0 25 50
75 100
Temperature (oC)
VRE3041L
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SUPPLY CURRENT
VS. SUPPLY VOLTAGE
6.0
5.0
4.0
3.0
0
0 5 10 15 20 25 30 35 40
Supply Voltage (V)
QUIESCENT CURRENT VS. TEMP
8.0
6.0
4.0
2.0
0
-50 0 50 100
Temperature (oC)
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OUTPUT IMPEDIANCE
VS. FREQUENCY
Frequency (Hz)
VRE3041DS REV. D JULY 2000

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TYPICAL PERFORMANCE CURVES
JUNCTION TEMP. RISE VS.
OUTPUT CURRENT
40
30
20 10V
Vcc =
10
0
024
6 8 10
Output Current (mA)
RIPPLE REJECTION
100 Vs. FREQUENCY(CNR=0µF)
90
80
70
60
10
100 1k
Frequency (Hz)
10k
TURN-ON AND TURN-OFF
TRANSIENT RESPONSE
A +10V
0V
B
1 µs/div
A: Vin, 10V/div
B: Vout, 1V/div
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OUTPUT NOISE-VOLTAGE
DENSITY vs. FREQUENCY
100
80
60
40
20
10
100 1k
Frequency (Hz)
10k
CHANGE IN OUTPUT VOLTAGE
VS. OUTPUT CURRENT
400
300
200
100
0 DataSheet4U.com
-100
-200
-300
-400
0 2 4 6 8 10 12 14 16
Iout(mA)
CHANGE IN OUTPUT VOLTAGE
VS. INPUT VOLTAGE
60
50
40
30
20
10
0
-10
-20
0
9 10 11 12 13 14 15 16
Vin(V)
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0.1Hz to 10Hz Noise
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1 Sec/Div
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THEORY OF OPERATION
The following discussion refers to the schematic in
figure 2 below. A FET current source is used to bias a
6.3V zener diode. The zener voltage is divided by the
resistor network R1 and R2. This voltage is then applied
to the noninverting input of the operational amplifier which
amplifies the voltage to produce a 4.096V output. The
gain is determined by the resistor networks R3 and R4:
G=1 + R4/R3. The 6.3V zener diode is used because it is
the most stable diode over time and temperature.
82
R1
R2
+
6
-
R4
5
R3
4
BASIC CIRCUIT CONNECTION
Figure 3 shows the proper connection of the VRE3041
voltage reference with the optional trim resistor for initial
error and optional capacitor for noise reduction.
CN 1µF
Optional Noise
Reduction
Capacitor
+ VIN
2
8
VRE3041
6
5
4
+ VOUT
10k
Optional Fine
Trim Adjustment
Figure 3 External Connections
To achieve the specified performance, pay careful
attention to the layout. A low resistance star configuration
will reduce voltage errors, noise pickup, and noise
coupled from the power supply. Commons should be
connected to a single point to minimize interconnect
resistances.
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Figure 2 Functional Block Diagram
The current source provides a closely regulated zener
current, which determines the slope of the references’
voltage vs. temperature function. By trimming theDazetanSerheet4U.com
current a lower drift over temperature can be achieved.
But since the voltage vs. temperature function is nonlinear
this compensation technique is not well suited for wide
temperature ranges.
Thaler Corporation has developed a nonlinear
compensation network of thermistors and resistors that is
used in the VRE series voltage references. This
proprietary network eliminates most of the nonlinearity in
the voltage vs. temperature function. By adjusting the
slope, Thaler Corporation produces a very stable voltage
over wide temperature ranges.
This network is less than 2% of the overall network
resistance so it has a negligible effect on long term
stability. Figure 3 shows the proper connection of the
VRE3041 series voltage references with the optional trim
resistor for initial error and the optional capacitor for noise
reduction.
PIN DESCRIPTION
1,3,7
2
4
5
6
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N.C.
Vin
GND
TRIM
OUT
NR
Internally connected. Do not use
Positive power supply input
Ground
External trim input. Leave open if
not used.
Voltage reference output
Noise Reduction
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VRE3041DS REV. D JULY 2000